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A wireless transfer link between three magnetically coupled resonators has been considered. Two different configurations have been investigated. In one case a single transmitter and two receivers are present. In the other case two transmitters and a single receiver are employed. For each case optimal analytical solutions for the load values that maximize the power delivered to the load(s) and the efficiency have been found and validated by comparisons with circuit simulations. [ABSTRACT FROM PUBLISHER]

Two novel balanced filters with wideband common mode suppression using dual-mode ring resonators are proposed in this paper. Two and four transmission zeros close to the passband are realized to improve the selectivity for the differential mode. In addition, over 20-dB common mode suppression can be realized from 0 GHz to 5f0 (f0 is the center frequency of the passband), due to the all-stop transmission characteristic of the open/shorted coupled lines. To verify the presented concepts, two prototypes (\varepsilonr=2.65, h=1.0\ mm) with 3-dB fractional bandwidths of 22.9% and 21.9% for the differential mode are designed and fabricated. The theoretical and measured results agree well and show good in-band filtering performance and high selectivity. [ABSTRACT FROM AUTHOR]

An odd-element half-wave-rectification superposition (OHS) technique is presented and verified for designing the high-multiplication factor frequency multipliers. The proposed OHS technique superposes N odd-element phase-shifted half-wave-rectification (HWR) fundamental signals ($f_{0}$) to extract the 2N-order harmonic (2N $f_{0}$) while canceling the fundamental ($f_{0}$) and the 2nd to (2N-1)th harmonics without extra filtering. Compared with the reported even-element half-wave-rectification superposition technique (EHS) technique, the proposed OHS technique can realize the same multiplication factor but requires only a half number of the input HWR signals. Thus, the proposed OHS technique can be applied to design the high-multiplication factor frequency multiplier that is difficult to be implemented using the reported EHS technique. To verify the validity of the proposed OHS technique, a differential $\times 6$ frequency multiplier with the input frequency range of 5-7GHz and output frequency range of 30–42 GHz was implemented in 65 nm CMOS process. The experimental results indicate that the implemented $\times 6$ frequency multiplier exhibits more than 23 dBc rejection to the fundamental and 2nd to 5th harmonics without the extra filter. The DC power consumption is 4.6 mW for the core circuit. [ABSTRACT FROM AUTHOR]

This paper presents a millimeter-wave (mm-wave) on-chip coupler with tunable power dividing ratios and constant phase response. Composed by two coupled lines, two capacitors and two series-connected varactors, the proposed tunable coupler offers broadband frequency responses for 5G applications. Theoretical analysis for wideband operation is provided. For demonstration, a millimeter-wave tunable coupler is implemented in a standard 0.13-μm SiGe (Bi) CMOS technology and measured through an on-wafer probing system. From 24 to 38 GHz, the proposed tunable coupler shows a power-dividing ratio ranged from 0 to 6.5 dB, while maintaining an in-band return loss of better than 10 dB and output isolation of 20 dB, simultaneously. The phase imbalance is better than ±2.5° with a measured insertion loss of 1.3 dB across the entire tuning range. To the authors’ best knowledge, this is the first time that an on-chip coupler with tunable power-dividing ratios is reported operating at mm-wave bands for, particularly, 5G applications. [ABSTRACT FROM AUTHOR]