Flat-Group-Delay RF Planar Filters With Transmission Zeros Using Transversal Circuits

被引：12
作者：
Gomez-Garcia, Roberto [1 ]
Yang, Li [1 ]
Malki, Mohamed [1 ]
Munoz-Ferreras, Jose-Maria [1 ]
机构：
[1] Univ Alcala, Polytech Sch, Dept Signal Theory & Commun, Alcala De Henares 28871, Madrid, Spain
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS | 2023年 / 70卷 / 10期
关键词：
Absorptive filter; analog filter; bandpass fil-ter (BPF); Bessel filter; directional coupler; discrete-time-filter modeling; group delay; hybrid ring; microstrip filter; microwave filter; planar filter; reflectionless filter; reflective filter; RF filter; transmission zero (TZ); transversal filter; BANDPASS-FILTERS; SHARP-REJECTION; POWER DIVIDER; DESIGN;
D O I：
10.1109/TCSI.2023.3298219
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Various families of flat-in-band-group-delay RF planar bandpass filters (BPFs) with multiple out-of-band transmission zeros (TZs) in their filtering transfer function are presented. As the first approach, a type of BPFs with theoretically-constant group-delay profile and perfect two-port-reflectionless behavior is proposed. The theoretical sufficient conditions to obtain a frequency-constant group delay in a generalized form of transfer function for these BPFs are derived. They are then particularized in transmission-line-based transversal-circuit realizations with flat-in-band-group-delay and quasi-reflectionless characteristics. Afterwards, a class of reflective-type BPFs based on directional power couplers that are arranged in transversal-mode topologies are addressed toward its practical demonstration for the first time. These BPFs, which exhibit flat in-band group delay, are compared with their classic Bessel-type BPF counterparts without TZs. Moreover, discrete-time models of such BPFs are derived, analyzed, and discussed. For experimental-validation purposes, proof-of-concept microstrip prototypes centered at 2.5-GHz of the engineered quasi-absorptive $\bm{/}$ reflective-type flat-in-band-group-delay BPFs are designed, manufactured, and characterized.
引用
收藏
页码：3843 / 3856
页数：14
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