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A wideband signal combining circuit with continuous bandwidth based on multichannel different‐/same‐frequency power combiner is presented. Two‐way signals with the same frequency can be combined to a higher power signal. Two‐way signals with different frequencies can be combined into a broadband signal. A stepped impedance resonator (SIR) is used as a multimode resonator. The wider bandwidth is got by SIR. And the selectivity of the two filtering channels is improved by the introduction of SIR stubs, which generate four transmission zeros on both sides of the passbands. The high 3‐dB point of the low‐frequency channel overlaps with the low 3‐dB point of the high‐frequency channel. Therefore, the output passband is continuous. The measured frequency ranges of two channels are 1.34–2.21 GHz/2.21‐2.87 GHz, respectively, and from 1.46 to 2.74 GHz, the input reflection coefficient is such that the return loss is higher than 15.5 dB. The insertion loss of the two channels is 0.71/1.18 dB, and the measured isolation is higher than 15.4 dB. The measured bandwidth of the combining signal is 1.5 GHz (1.34–2.84 GHz). [ABSTRACT FROM AUTHOR]

This article presents a broadband substrate integrated coaxial line (SICL) radial power divider with high output isolation. The proposed power divider mainly consists of input impedance matching circuits, microstrip isolation circuits, and radial SICL circuits. The two‐layer substrate of the input impedance matching circuit acts as a quasi‐coaxial structure and is connected to the coaxial input port to provide the function of impedance matching. The star‐type microstrip isolation circuits are employed to enhance the isolation performance between the output ports of the power divider. Two designed substrates sandwiching the air cavity layer constitute the radial SICL circuit, and the input microwave signal is evenly divided into 8 channels of signals with the same power. The designed power divider using SICL technology has the characteristics of supporting transverse electromagnetic mode transmission, being broadband, and compatible with substrate integration. A prototype of the multi‐layers eight‐way SICL power divider is designed, fabricated, and measured. The measured results show that the relative bandwidth of 15 dB input/output return loss is 34% and 43%, respectively. The absolute bandwidth of 15 dB input/output return loss is 5–7 GHz and 4.5–7.1 GHz, respectively, and the isolation between output ports is greater than 20 dB in the above frequency bands. [ABSTRACT FROM AUTHOR]

This letter presents a six‐channel bandpass filter bank created on substrate integrated waveguide (SIW) with improved bandwidth and frequency selectivity on the lower band. Through SIW square cavities and slant slots, a two‐dimensional multichannel bandpass filter bank with a transmission zero constructed with the SIW orthogonal resonant modes is produced. The substrate integrated square cavity approach is used to achieve the propagation of the two orthogonal‐oriented transverse electric modes, TE102 and TE201, which resonate on the same frequency and bandwidth, depending on the location of the feed ports. The bandwidth could be altered by the coupling matrix synthesis and coupling windows. Better transmission and bandpass responses are produced in each channel when the feed ports and coupling gaps are positioned and appropriately adjusted. However, a pair of slot lines are imprinted along each cavity's designated diagonal to guarantee better isolation while attaining an increased fractional bandwidth. A 3 × 3 array of six bandpass filters with a center frequency of 8.65 GHz has been built, simulated, and measured to establish the suggested technique. Low insertion loss, high return loss, high isolation, an improved fractional bandwidth, and a compact device were the proposal's advantages. [ABSTRACT FROM AUTHOR]

An equal 18‐way power divider, using a half‐air‐filled stripline technique, is presented in this letter. An amplitude equalization network is designed to mitigate the amplitude imbalance of the multiplexed planar/quasi‐planar power‐division network. Optimized transmission paths are obtained based on a combination of 1‐6‐3 power division and a multilayer structure, which effectively reducing transmission losses. To validate the design, this power divider, which is used to feed a sparse antenna array, is designed, optimized, fabricated, and measured. The measured return loss was better than 18 dB, and the measured insertion loss was better than 1.55 dB over the range 7–10 GHz. The amplitude imbalance is better than 0.4 dB, and the phase imbalance is better than 7.3°. The measured results are in good agreement with the simulation results. [ABSTRACT FROM AUTHOR]

In this paper, a hybrid continuous inverse class‐F high‐efficiency power amplifier based on phase shift analysis is proposed. A broadband and high‐efficiency microwave power amplifier are designed by adopting load pull, source pull technique, and low‐pass filter matching structure. The measured results show that the drain efficiency ranges from 67.5% to 77.8%, the saturated output power ranges from 40.2 to 42.4 dBm, and the saturated power gain ranges from 10.2 to 12.4 dB in the working frequency band from 2 to 3 GHz. The power amplifier proposed in this paper fits the current broadband microwave communication technology and plays an important role in the transmission of high data flow signals by wireless transmitters. [ABSTRACT FROM AUTHOR]