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ABSTRACT A millimeter-wave (MMW) miniature planar dual balun (i.e. single-to-dual-differential four-way equal power divider) in 90 nm CMOS technology is reported. The dual balun can be applied to a star mixer for converting the single RF (or LO) input signal to dual differential RF (or LO) signals, or a four-way power amplifier (PA) for four-way equal power dividing. In contrast to the traditional four-way PA that uses three Wilkinson power dividers for four-way equal power dividing, the proposed PA achieves smaller chip area, higher output power and higher power-added-efficiency The dual balun occupies a small chip area of 0.14 mm×0.18 mm (i.e. 0.0252 mm2) and achieves S11 smaller than −10 dB for frequencies of 50-110 GHz. For frequencies of 55-65 GHz, the dual balun achieves S21 of −7.6 to −7.9 dB, S31 of −7.9 to −9 dB, S41 of −7.5 to −7.9 dB, S51 of −7.8 to −8.9 dB, magnitude of amplitude imbalance (MAI) of 0.34-1.1 dB and phase difference (PD) of 179.22-180.78° for ports 2-3, and MAI of 0.3-1 dB and PD of 178.83-180.48° for ports 4-5. For frequencies of 75-85 GHz, the dual balun achieves S21 of −9.1 to −10.5 dB, S31 of −10.7 to −12.7 dB, S41 of −9.1 to −10.5 dB, S51 of −10.7 to −12.6 dB, MAI of 1.7-2.2 dB and PD of 179.42-180.59° for ports 2-3, and MAI of 1.6-2.1 dB and PD of 179.93-180.73° for ports 4-5. The state-of-the-art results of the proposed dual balun indicate that it is suitable for 60 and 77 GHz communication systems. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:850-860, 2016 [ABSTRACT FROM AUTHOR]

An X-band H-plane wideband substrateintegrated waveguide (SIW) T-junction power divider with unequal-power-division ratio is presented. Several inductive posts are used to have arbitrary power dividing ratio and also to control the phase difference. The position and diameter of these posts tune the power-split ratio and the phase difference in whole bandwidth. Parametric studies have been done to choose the best positions and diameters to get better results. Two different prototypes have been verified the proposed technique. They are designed and fabricated at a center frequency of 11 GHz. The measured input impedance bandwidths are 54% for Δout =3 dB and 45% for Δout =6 dB respectively. [ABSTRACT FROM AUTHOR]

By shunting a susceptance at the middle of the branch of a conventional Wilkinson power divider, the size can be reduced and the harmonic components can be suppressed. Further, miniaturization can be achieved by optimal layout of the internal area of the conventional power divider. In this article, simple design methods to implement miniaturized Wilkinson power dividers with harmonic suppressions are presented. To validate the design methodology, two power divider prototypes are optimally designed and examined from electromagnetic simulations and experiments. As compared to conventional types, the circuit sizes of the demonstrators are effectively reduced to 15.6 and 24.98%, respectively, and the spurious suppressions are over 20 dB at the desired harmonic frequencies. Meanwhile, the mechanisms of spurious suppression are studied herein. The achieved performance simply confirms the presented design methodology. [ABSTRACT FROM AUTHOR]

ABSTRACT A compact two-way equal power divider using three-line coupled structure is proposed. The effective length of the power divider is around a quarter-wavelength. To enhance the bandwidth of operation, a half-wavelength resonator is constructed by introducing a short-ended stub to combine with the open-ended microstrip line. A prototype of the power divider is designed and fabricated. The measured input return loss, output return loss, isolation, amplitude imbalance, and phase imbalance are better than 10.3, 14.4, 10.1, 0.2 dB, and 3.2°, respectively, across the entire ultra-wideband (UWB). © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:713-715, 2016 [ABSTRACT FROM AUTHOR]

ABSTRACT A novel compact dual-band power divider with filtering responses is presented in this article. The proposed circuit utilizes coupled quarter-wavelength stepped-impedance resonators. By controlling these resonators, dual-band operation can be realized. Furthermore, a resistor is connected between the two open ends of the input feed line to obtain good isolation at two bands. Source load coupling is utilized to enhance the selectivity. To verify the proposed idea, a filtering power divider with the operating frequencies of 2.4 and 5.8 GHz is implemented. Good agreement between the simulated and measured results validates the proposed idea. The total size of the circuit is 0.23 λg × 0.28 λg, where λg is the guide wavelength of 2.4 GHz. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:262-267, 2016. [ABSTRACT FROM AUTHOR]

A four-way all-metal-waveguide power divider has been presented and analyzed in this paper. A metal matching cylinder and a transition waveguide are applied to implement wide impedance matching from the input port to the four output ports. A simple equivalent-circuit model for this power-dividing structure has been developed. Moreover, the theoretical power-handling capability of the presented power-dividing structure has also been investigated. To verify the validity of the proposed structure, a four-way power divider at W-band has been fabricated with conventional machining. The measured return loss is greater than 14.5 dB from 82 GHz to 107 GHz. The measured insertion loss of the four-way all-metal-waveguide power divider is about 6.5 dB, which corresponds to a power-combining efficiency of 89 %. [ABSTRACT FROM AUTHOR]

A broadband six-way out-of-phase substrate-integrated waveguide (SIW) power divider was designed, analyzed, and fabricated for low loss and out of phase dividing applications. The SIW technology was used to realize the power divider; where it consists of a central dual-disc probe connected with coaxial outer-conductor impedance matching transformer and six SIW-to-microstrip transitions as output probes. Three of the SIW-to-microstrip transitions are located at the top plane, whereas the other three are at the bottom plane of the power divider to achieve the out-of-phase dividing functioning. These transitions are all the same in size and shape for symmetry reason. Good transmissions from coaxial input port to six-way SIW power divider were also achieved. There is a reasonable agreement between measured and simulated results. [ABSTRACT FROM PUBLISHER]

ABSTRACT A novel compact single-layer wide-band planar balun with high isolation is proposed. It is composed of a broadband coupled-line power divider and an improved phase shifter using coupled-line (CL) and composite right/left-handed transmission line (CRLH TL). The CRLH structure is used to realize the advanced phase response while the coupled-line power divider can be utilized to provide the performance of wide-band matching and isolation. For demonstration, a novel planar microstrip balun operating at ∼2.75 GHz is designed and implemented. The proposed balun has many advantages including compact single-layer structure, excellent return loss, high isolation, and perfect phase response. Finally, good agreements between the simulated and measured results verify this design. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:372-376, 2016 [ABSTRACT FROM AUTHOR]

ABSTRACT A novel differential power divider with bandpass filtering response using the substrate integrated waveguide (SIW) technology is presented. An SIW resonant cavity operated in a balanced resonant mode with odd symmetric electric field distribution is utilized to provide both balanced inputs/outputs and expected common-mode (CM) suppression in a certain band. Meanwhile, by properly constructing the cross-coupled topology of SIW resonant cavities, the proposed differential power divider achieves a high-selectivity bandpass filtering response with two transmission zeros on both sides of the passband. The differential power divider is designed and prototyped on a single-layer printed circuit board (PCB). The measured center frequency is at 10.6 GHz with 490 MHz 3-dB bandwidth. A good CM suppression can also be achieved within the operating band. The measured in-band differential-mode imbalance for magnitude is ±0.3 dB, while for phase is 0°-4°. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:182-188, 2016. [ABSTRACT FROM AUTHOR]

This paper introduces a new variable power divider circuit with an arbitrary power division ratio ranging from 1:∞ to ∞:1. The proposed power divider circuit consists of one branch-line coupler to be a good input matching characteristic, two variable phase shifters with 90-degree phase variation to be connected two output paths of the branch-line coupler, and one ring-hybrid coupler to combine output signals of two variable phase shifter. The power division ratio between the two output ports of the proposed power divider can be easily controlled by the phase variation of the two phase shifter. The proposed power divider circuit fabricates on laminated RF-35 (h = 20 mil, er=3.5; Taconic) with a center frequency of 2 GHz. The power division ratio of the fabricated prototype varies from about 1:1000 to 5000000:1, with an input reflection characteristic(S11) of below -20 dB, an insertion loss of about -1.0 dB, and an isolation characteristic of below -17 dB between two output ports in the range 1.9-2.1 GHz. [ABSTRACT FROM AUTHOR]

ABSTRACT In this letter, the design of planar six-way and eight-way power dividers by interconnecting power dividers with two and three output ports is studied. Using this approach, equal ripples of input reflection (S11) within a wide pass band are obtained. The interconnecting lines are used as additional matching sections. The isolation resistors are selected to obtain the optimal output port matching and isolation performances. A prototype of compact, low loss, and wideband eight-way power divider is designed, fabricated, and measured. The simulation and measurement results are in good agreement. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:189-192, 2016 [ABSTRACT FROM AUTHOR]

In this article, a novel ultra-wideband power divider is presented. To achieve ultra-wideband performance and a sharp roll-off skirt, the parallel coupled lines and a short-circuited line are introduced on each side of the coupled three-line microstrip structure. Through even- and odd-mode analysis, the analytical design equations for this proposed power divider are obtained. A prototype power divider is designed and fabricated to demonstrate the performance of the proposed power divider. The simulated and measured results show that the proposed power divider has achieved the predicted features within the specified 3.1–10.6-GHz ultra-wideband range. [ABSTRACT FROM PUBLISHER]

The 3-dB power divider is one of the most common three-port device in microwave systems, which equally splits the signal at its two output ports. In previous Wilkinson power divider design, the phase delay between the input and output ports is not considered into the design requirements. However, the zero-phase shifting power divider attracts great interest in modern microwave systems. In this letter, a 3-dB power divider with zero-phase delay is designed based on a zero-phase impedance transformer. Instead of metamaterial transmission line, a transmission line stub is added to connect the isolation resistor, and a capacitor is insert between the output ports and the end of main branch to cancel out the imaginary part of even–odd mode impedances. With this new design, it releases the layout restriction that the two branches route around to connect to lumped element resistor. Closed-form design equations are derived and a prototype device is then simulated and measured. The measurement results agree well with the simulation results. [ABSTRACT FROM AUTHOR]

A quasi-planar ${H}$ -plane waveguide power divider/ combiner with full bandwidth is proposed in this letter. The proposed waveguide power divider is composed of three ${H}$ -plane rectangular waveguide ports, located in the horizontal plane, a vertical port at the bottom, and a coupling region. The coupling region, all the three ${H}$ -plane ports, and the entire waveguide section share the same upper plane, which makes the proposed power divider a quasi-plane structure. Based on the optimized simulation results, a prototype of the waveguide power divider was fabricated and tested. The measured results show that the return loss for all ${H}$ -plane ports is lower than −20 dB, the overall insertion loss is lower than 0.15 dB, and the isolation between the two output ports is higher than 20 dB. The measured amplitude and phase difference are less than 0.1 dB and 1°, respectively. [ABSTRACT FROM AUTHOR]

A radial multiway power divider is used to distribute microwave signals to the next stages located radially around all directions. It has been a challenging task to implement a radial multiway power divider on a planar circuit board without sacrificing the bandwidth performance. In this letter, a radial four-way power divider with the proposed isolation network is presented. The isolation network, composed of several combined RLC and LC networks, plays the crucial role of making the radial layout style easy to realize, and meanwhile improves the output matching and port-to-port isolation. The background principle of the proposed topology and the guideline of designing the isolation network are provided. The fabricated radial four-way power divider results in the measured −20-dB output matching and isolation bandwidths as large as 35% and 65%, respectively, exhibiting the best bandwidth performance among all the published radial power dividers of the same type. [ABSTRACT FROM PUBLISHER]

In this paper, a dual-frequency compact power divider based on silicon via (TSV) is proposed. The matrix analysis method is used to convert the microstrip structure into Π-type structure, which improves the integration of the circuit. The proposed dual-frequency power divider structure is simulated and verified with High Frequency Structure Simulator (HFSS). The results show that the two frequency points of the dual frequency power divider structure are 10 GHz and 20 GHz respectively. In the low frequency band, the input return loss, and isolation are all lower than −15dB from 6.5 to 14.6 GHz. Insertion loss is better than −3.1 dB. In the high band, input return loss and isolation are all below −15dB from 15.3 to 20.8 GHz. Insertion loss is better than −3.3 dB. In addition, the size of the dual frequency power divider is only 0.2 × 0.428 mm2(0.009 × 0.004 λ g 2). [ABSTRACT FROM AUTHOR]

A Ka-band isolated radial power divider via circular waveguide TE01-mode converter is presented in this paper. By redesigning and using the circular waveguide TE01-mode transducer to feed the 20-way radial power divider–combiner, the overall structure is miniaturized. Moreover, the resistive septum is inserted into the waveguide to improve the return loss and the isolation of the output ports. A measured return loss at the output port has improved by around 15 dB, while the worst case isolation is more than 12 dB over 28–36 GHz after using the resistive septum. [ABSTRACT FROM PUBLISHER]

A 1-to-25-way uniform amplitude and linear phase power divider, using slotted rectangular waveguides in the traveling-wave mode, is designed to cover the 71–77-GHz band. The design employs the scattering parameters of three-port couplers computed from the method of moments (MoM) solution to the integral equation of the slot aperture field. Subsequent genetic algorithm (GA) optimization is aimed at maximizing the return loss and combining efficiency and flatness of coupling amplitudes in the whole frequency band. GA utilizes the MoM solution to the coupled integral equations of slot apertures in the entire power divider structure. Simulations indicate the optimized power divider yielding better than 26-dB return loss and greater than 86% efficiency in the 71–77-GHz band for the power divider combiner connected back to back. Computed MoM results have been validated by the commercial code HFSS and also by experimentally measured results. The measured insertion loss of two back-to-back divider–combiners is about 2 dB. [ABSTRACT FROM PUBLISHER]

ABSTRACT A five-port power divider with single-ended input and two differential-ended outputs is proposed. The frequency ranges from 9 to 11 GHz with a central frequency of 10 GHz. A stepped impedance line with open stubs is used between differential pairs for broadening the bandwidth and miniaturization of the divider. The divider is fabricated and the measurement results comply with the simulation. A proper performance for differential mode signal is achieved. The insertion loss is within 1.8 dB, the isolation is more than 15 dB, and the return loss is more than 11 dB. In addition, the common mode suppression is reached as well. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2669-2673, 2015 [ABSTRACT FROM AUTHOR]

This article presents a novel structure to design miniaturized dual-band filtering power dividers. It is realized by combining the feeding lines and coupled stub-loaded quarter-wavelength resonators. The operating frequencies can be adjusted easily by controlling the stub length of the resonator. Source–load coupling is employed to generate transmission zeros to enhance the selectivity. A resistor is added to guarantee the isolation and port matching. For demonstration, a dual-band filtering power divider is implemented. Good agreement between the prediction and measurement validates the proposed method. [ABSTRACT FROM AUTHOR]

This paper presents a Smith chart-based methodology for designing a dual band real impedance matching network. The focus is to depict the dual band behavior using Smith chart, giving a better insight into analytical equations thus derived. To validate the design methodology, a dual band 3dB Wilkinson power divider is designed at two frequencies i.e. 0.9 GHz and 2.45 GHz. Summary of the derived equations and a generic MATLAB code is appended, as a quick design tool. [ABSTRACT FROM AUTHOR]

This paper proposes the new design of compact ultra wideband (UWB) 3 dB coupled-line coupler and 90° power divider. The proposed coupler utilizes zig-zag-shaped slot at the ground plane underneath microstrip coupled-line to enhance the bandwidth and coupling strength significantly. The technique has alleviated the need of a very narrow spacing between parallel coupled-line for easier fabrication process. The proposed coupler is then being implemented into the new proposed structure of 90° power divider that requires an appropriate phase difference of −90° with equal power division across UWB frequency range. The design of 3 dB coupled-line coupler and 90° power divider are realized using Rogers TMM4 substrate, which simulated by using CST Microwave Studio. Excellent UWB performances are achieved in terms of input reflection coefficient, isolation, coupling factor and transmission coefficients. [ABSTRACT FROM AUTHOR]

A compact planar wide-band power divider for microwave wireless applications is presented. The miniaturization of the compact broadband power divider is implemented by using a novel co-directional split ring resonator (SRR) structure. The SRRs are etched on the conduct signal strip, which can be easily fabricated and integrated in planer microwave circuits. The proposed power divider has a compact size of only 15 × 14.97 mm 2 . The measurement results show that the proposed power divider offers a wide bandwidth from 1 GHz to 7 GHz (S11 < −10 dB) successfully. The proposed power divider demonstrates equal dividing and good matching in all the relevant bands. [ABSTRACT FROM AUTHOR]

ABSTRACT A compact equal power divider (PD) with filtering function and improved out-of-band performance is proposed in this article. The proposed PD is based on the conventional Wilkinson PD and two filtering cells. The filtering cell is composed of four λ/4 stepped-impedance resonators (SIRs). Using the edge and quasi-lumped coupling topology, a compact PD with improving passband selectivity can be achieved. Meanwhile, by appropriately adjusting the impedance and electric length ratios of SIRs, the stopband can be extended to 39.2 GHz with a rejection level of 20 dB, which is 25 times of the fundamental frequency. The predicted results on S-parameters are compared with the measured ones and good agreement is achieved. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2274-2277, 2015 [ABSTRACT FROM AUTHOR]

Microstrip Wilkinson power dividers with harmonic suppression and size reduction are investigated. It is found that by loading reactive components at the middle of high impedance transmission lines (TLs), both size reduction and harmonic suppression can be achieved. Analyses and designs of such a kind of power divider are formulated in this paper. To demonstrate the design methodology, two power dividers centered at 1.8 GHz are optimally designed and confirmed by experiments. As compared with conventional Wilkinson power divider, the proposed power divider exhibits 55.6% size reduction, and high suppressions are achieved for 2nd and 3rd harmonic components. Both simulations and measurements are presented with good agreement. [ABSTRACT FROM AUTHOR]

ABSTRACT Two element array of circular ring microstrip patch antenna is proposed for modern wireless applications. A circular slot is integrated in the circular patch for providing a notched band at frequency of 4.6 GHz for avoiding the interference with exciting band at frequency of 4.6 GHz. A 50-Ω microstrip line power divider is used for feeding the both circular ring elements of array. The corners of the power divider are truncated for providing the better impedance matching. Antenna shows an impedance bandwidth of 185.5% ranging from 1.0 GHz to 13.8 GHz. Proposed antenna shows good radiation characteristics with peak gain of the value of around 8 dBi. Single element of same circular ring fed with microstrip line also proposed with semiground plane. The antenna is analyzed with finite element method using HFSS v.14. Proposed structure is fabricated on Fr-4 Epoxy substrate and measured results are in good agreement with simulated results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2067-2072, 2015 [ABSTRACT FROM AUTHOR]

In this paper, we present a novel compact threeway power divider with bandpass responses. The proposed power divider utilizes folded net-type resonators to realize dual functions of filtering and power splitting as well as compact size. Equal power ratio with low magnitude imbalance is achieved due to the highly symmetric structure. For demonstration, an experimental three way filtering power divider is implemented. Good filtering and power division characteristics are observed in the measured results of the circuit. The area of the circuits is 14.5 mm x21.9 mm or 0.16 κgx0.24 κg, where the).g is the guided wavelength of the center frequency at 2.1 GHz. [ABSTRACT FROM AUTHOR]

This paper presents the size miniaturized and harmonic suppressed lossless 1:4 T-junction unequal power divider using an open complementary split ring resonator (OCSRR). By embedding the OCSRR structure in the microstrip transmission line, slow wave effect is introduced and thereby size reduction is achieved. The dimensions of OCSRR are optimized to reduce the length of high impedance and low impedance quarter-wavelength transmission lines. In our design high impedance line length is reduced to 58.6%, and low impedance line length is reduced to 12% when compared to the conventional quarter wave length lines. The proposed power divider is having small dimensions of 0.18 κg 0.33 κg and is 51.94% smaller than the conventional unequal power divider. [ABSTRACT FROM AUTHOR]

This article proposes the design of wideband multilayer microstrip-slot in-phase power implementing two different shapes of tuning stubs, which are rectangular and circular. The design and analysis are performed via the use of full-wave electromagnetic simulation software package, CST Microwave Studio. The designed power divider with optimal tuning stubs has been fabricated, and its wideband performance of 2-6 GHz is verified. [ABSTRACT FROM AUTHOR]

ABSTRACT A planar in-phase power divider with extreme wideband behavior using modified Wilkinson design is presented. Instead of using T-junction at the input port of the traditional design, the proposed divider uses broadside coupled microstrip to slotline configuration. Moreover, the impedance matching of the output ports is significantly improved across several octaves bandwidth using three binomial sections, whereas the isolation between those ports is enhanced across that band using three isolation resistors. The utilized structure is suitable for single layer integration as both the input and output ports are located at the same layer. A prototype of the presented device is designed using a proper theoretical approach, built, and tested. The developed device has a compact size with an overall dimension of 40 × 55 mm2 using the substrate Rogers RO4003 (dielectric constant = 3.38, thickness = 0.406 mm). While the device can be used for any wideband application, the developed prototype is designed to operate within the band 1-7 GHz, which is used in most microwave-based medical imaging applications. The achieved simulated and measured results show that the proposed device has equal power division between the two output ports with less than 0.2-dB amplitude imbalance, more than 10-dB return loss and 15-dB isolation, and less than 2° phase difference between the two output signals across the extremely wide frequency band 1.2-7 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1799-1802, 2015 [ABSTRACT FROM AUTHOR]

In this paper, a balanced-to-unbalanced microstrip power divider based on branch lines with several stubs and one resistor is proposed. The functions of power dividing, frequency selectivity, isolation between output ports, and common-mode suppression can be realized at the same time. The even–odd-mode equivalent circuits combining with the standard S-parameters and the mixed-mode S-parameters are adopted to derive the analytical equations at the center frequency. One or two transmission zeros can be achieved to enhance the out-of-band suppression. The center frequency, bandwidth, isolation, common-mode suppression, and the frequencies of transmission zeros can be controlled by the design procedure. To verify the theoretical prediction, two fabricated prototypes are designed and compared. One gets 7.7% 1-dB bandwidth with 0.6-dB insertion loss and one transmission zero. The other gets 1-dB bandwidth of 5% with 0.7-dB insertion loss and two transmission zeros. The isolation and common-mode suppression for both prototypes are better than 15 and 20 dB within the whole passband, respectively. [ABSTRACT FROM AUTHOR]

A novel 1-to-N broadband “i\pi-wave” power divider/combiner with reflection cancellation is presented and demonstrated. The new i\pi-wave structure provides reflection cancellation and output port isolation with 1-to-N (arbitrary N) signal splitting or N-to-1 summing. It has low loss due to its use of low-impedance transmission lines and provides a relative bandwidth of 50%–200%. The concept is studied theoretically and demonstrated experimentally with several 1-to-4 dividers. The divider/combiner pair provides power amplifiers with broadband operation and well-matched input/output impedances. The concept can be implemented in hybrid circuits or monolithic microwave integrated circuits (MMICs). [ABSTRACT FROM PUBLISHER]

This paper presents a new design of a compact Gysel power divider with harmonic suppression. It comprises six similar low-pass filters in lieu of six conventional transmission lines in the Gysel power divider. Not only does the proposed power divider extremely reduce the occupied area to 22.7% of the conventional Gysel power divider at 900 MHz, but also it features the higher order harmonic rejection. Simulation and measurement results show good insertion loss, return loss, isolation, and wide stopband bandwidth, while maintaining high-power handling capability over the Wilkinson power divider. [ABSTRACT FROM AUTHOR]

The design of the quadrature phase shift keying (QPSK) modulator by using a multi-port network is proposed in this article for the use in wireless communication applications. The multi-port network is in the form of multilayer microstrip-slot technology. This multi-port network is composed of three 3-dB rectangular-shaped directional couplers with virtual stubs and an equal power division divider with in-phase characteristic. The design is performed by applying a full-wave electromagnetic simulation software, CST Microwave Studio (CST MWS). Keysight's Advanced Design System (ADS) is applied in analyzing and evaluating the QPSK constellation of the proposed modulator. This comparatively small size of proposed design has been fabricated, and its wideband performance of 2 to 6 GHz is verified. [ABSTRACT FROM AUTHOR]

ABSTRACT The design of an ultrawideband (UWB) power divider with harmonics suppression is presented. With the proposed approach, the size of the quarter-wavelength transmission line can be reduced and the high order harmonics can be suppressed. The design equations are deduced by transmission line theory. A prototype power divider operated at UWB band is designed and fabricated. Experimental results show good performance of the proposed design. In addition, a stop-band with rejection level more than 20 dB is from 17.3 to 24.5 GHz. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:299-304, 2015. [ABSTRACT FROM AUTHOR]

A novel compact ultra-wideband (UWB) eight-way ring-cavity power divider is presented in this paper. To broaden the bandwidth of the power divider/combiner, the stepped-impedance technology is used to realize the impedance match. The network of this eight-way ring-cavity power divider has been analyzed. The measured results reasonably agree with the simulated ones. The measured return loss is greater than 10 dB from 5.2 to 18.6 GHz. The average insertion loss, amplitude imbalance, and phase imbalance are around 9.4 dB (including the 9-dB power-dividing insertion loss), ±0.7 dB, ±6°, respectively, across the entire operating frequency range. [ABSTRACT FROM PUBLISHER]

A novel in-phase power divider using two synthetic coupled lines (CLs) and one isolation resistor is presented. The synthetic transmission lines (TLs) so-called the complementary-conducting-strip CL consists of periodical structures. By adopting the meandered and edge-coupled TLs the design reveals a two-way power divider and features a wideband behavior with a compact chip size. Moreover, the power divider also provides a 0° phase difference between input and output ports at 24 GHz. The chip is fabricated in a standard 0.18- \mu \textm CMOS technology with a core area of 30 \mu \textrm m \times 30\mu \textm . Measurements show that the minimum insertion losses ( \vert S21\vert and \vert S31\vert ) of the power divider are 5.38 and 5.43 dB at 23.5 GHz, respectively. Moreover, the power divider can operate from 15 to 28 GHz with superior RF performances on return losses and isolation. [ABSTRACT FROM AUTHOR]

This article describes the design of U-shaped wideband power divider implemented with ground-slotted technique. The slotlines at ground plane underneath second and third arm promises wider bandwidth performance. In this proposed designed, the second and third arms are formed by microstrip line with J-shaped slot underneath. In order to obtain the impedance and dimension of microstrip line and slot forming the quarter-wave transformer, the new equation is proposed and discussed in this paper. The relation between characteristic impedance of microstrip-slot transmission line $$(Z_{\mathrm{m-s}})$$ with slot width $$(\hbox {W}_{\mathrm{s}})$$ and microstrip impedance $$(Z_{\mathrm{m}})$$ is obtained by using completing square curve fitting method. To realize the circuit, substrate Rogers TMM4 is used. The thickness of the substrates is 0.508 mm with dielectric constant of 4.5 and 35 $$\upmu \hbox {m}$$ cooper coating. The performance of power divider is formulated by using commercially available CST Microwave Studio. The performance of the fabricated device is then compared with simulation. The optimum result has been achieved over wideband frequency with the measured and simulated result show reasonably comparable performance between 4 and 11 GHz. [ABSTRACT FROM AUTHOR]

A set of novel split-ring resonator basic block Hybrid-Microwave Integrated-Circuit (HMIC) components (transmission line, open and short stubs) is presented with applications to the RF/Microwave power divider. This new open and short LH HMIC resonators have compact sizes of 0.81 and 1.44 mm², respectively. The prototypes of an LH power divider constructed from these basic components have been designed, fabricated, and characterized. The LH power divider including two LH branches shows equal power split from 1 to 7 GHz. The proposed power divider benefit from the miniaturized LH HMIC components and have compact sizes of 2.205 mm², respectively. There is a good agreement between the full-wave simulations and measurement results with 0.254-mm thick RT5880 substrate. While maintaining similar performance, a 50% reduction in impedance transformer is achieved in comparison to a conventional design. [ABSTRACT FROM AUTHOR]