期刊
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
卷 69, 期 1, 页码 825-832出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2020.3041016
关键词
Delays; Insertion loss; Varactors; Couplers; Resonators; Microwave theory and techniques; Loss measurement; Delay-sum method; group delay controller (GDC); reflective load; varactor diode; variable power combiner (VPC); variable power divider (VPD)
资金
- IITP Grant - Korea Government (MSIT) [2020000218]
This article presents a group delay controller circuit based on the delay-sum method, which can be employed in self-interference cancellation circuits in full-duplex radio systems. Variable group delay is achieved by changing power ratios, with resonant reflective loads and asymmetric connections improving response flatness.
This article presents a group delay controller (GDC) circuit based on the delay-sum method. The proposed circuit can potentially be employed in a self-interference cancellation circuit in full-duplex radio systems. The proposed GDC splits the input signal into two signals with different magnitudes and then combines them in-phase at the output port. Variable group delay can be achieved by changing the power ratio of the two signals. The power dividing ratio (PDR) is changed by employing a variable power divider/combiner (VPD/VPC). The resonant reflective loads substitute for a single varactor diode such that the limited PDR of the VPD/VPC does not degrade the group delay variation range of the GDC. The resonant load can provide infinite PDR by covering open to short susceptance. In addition, asymmetrically connecting the VPD and VPC provides a flatter group delay response. As a result, the delay-sum method enables the proposed GDC to provide low and constant insertion loss while providing low insertion phase variation. The proposed delay sum GDC is demonstrated at 2.5 GHz. The measured insertion loss is only 2.18 +/- 0.28 dB with a continuously controlled relative group delay of 430 ps. Furthermore, the insertion phase variation is only 7.3 degrees at 2.5 GHz, and input/output matchings are maintained for all delay settings.
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