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Single-Layer Dual-Band Balanced Substrate- Integrated Waveguide Filtering Power Divider for 5G Millimeter-Wave Applications
摘要： A single-layer substrate-integrated waveguide (SIW) filtering power divider (FPD) with fully differential operation at 28 and 39 GHz is proposed in this letter. This FPD consists of three SIW cavities where the differential and common modes of each cavity were properly designed to form three-pole dual passbands, facilitate deployment of isolation resistors, and introduce transmission zeros while attaining high in-band common-mode rejection. To improve the output return loss and isolation in dual bands, a novel and simple approach to find the proper location of isolation resistors is presented. At operating frequencies, the measured differential-mode input or output return loss, minimum insertion loss, isolation, and common-mode suppression are >14.1 dB, <(3 + 2.2) dB, >14.9 dB, and >30.3 dB, respectively. The amplitude and phase imbalances between outputs are <0.48 dB and <4.2?, respectively.
关键词： balanced,dual-band,isolation resistor,common-mode rejection,substrate-integrated waveguide (SIW),differential,single-layer,mixed-mode,filtering power divider (FPD),5G
更新于2025-09-23 15:21:01
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Novel Reconfigurable Single-to-Balanced, Power-Dividing, and Single-Ended Filter With Frequency and Bandwidth Control
摘要： In this paper, a novel tunable ?lter with recon?gurable single-to-balanced (SE-BAL), power dividing (PD), and single-to-single-ended (SE) ?ltering functionalities is proposed, for the ?rst time, without any additional switching circuit. The proposed ?lter only consists of three stepped-impedance resonators, which are loaded and connected by varactors in between. With a very simple and compact con?guration, the proposed ?lter achieves multiple recon?gurable functionalities between SE-BAL ?ltering, PD ?ltering, and conventional SE bandpass ?ltering. Moreover, the recon?gurable SE-BAL, PD, and SE bandpass ?lter can not only offer continuously frequency tuning over a wide tuning range but also have independent bandwidth tuning and maintain good phase/amplitude balance in each tuning state. The proposed ?lter is designed and fabricated with the microstrip line technology; the measured results show that the SE-BAL, PD, and SE ?ltering functions can be continuously tuned from 1.02 to 1.32, 0.96 to 1.27, and 1 to 1.28 GHz, with 1-dB bandwidth tuning from 30 to 60, 30 to 110, and 70 to 130 MHz, respectively. The amplitude and phase imbalances of the SE-BAL and PD bandpass ?lter are less than 0.4 dB, 1.3° and 0.5 dB, 1.5°, respectively, in the passband of each tuning state. Good agreement was obtained between simulated and measured results.
关键词： single-ended (SE) ?lter,single-to-balanced (SE-BAL) ?lter,recon?gurable ?lter,Filtering power divider (FPD)
更新于2025-09-09 09:28:46