Low-Loss Directional Filters Based on Differential Band-Reject Filters With Improved Isolation Using Phase Inverter

被引：9

作者：

Sorocki, Jakub ^{[1
]}

Piekarz, Ilona ^{[1
]}

Gruszczynski, Slawomir ^{[1
]}

Wincza, Krzysztof ^{[1
]}

机构：

[1] AGH Univ Sci & Technol, PL-30059 Krakow, Poland

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2018年 / 28卷 / 04期

关键词：

Differential band-reject filter (DBRF); directional filter (DF); isolation improvement; low-loss passive circuit; phase inverter (PI);

D O I：

10.1109/LMWC.2018.2805864

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：

In this letter, a novel approach to the design of directional filters (DFs) based on the differential bandstop filter and delay lines is proposed. It is shown that utilization of a phase inverter (PI) and reference line as a mode-converting phase shifter allows for obtaining theoretically ideal bandpass-to-bandstop channels isolation over an infinite bandwidth. The presented theoretical analysis is confirmed by realization of an exemplary low-loss DF with defected ground type PI covering industrial, scientific, and medical, 2.4-GHz band. The obtained measurement results show insertion loss as low as 1.1 dB and almost flat isolation response, better than 27 dB up to 6 GHz proving the validity of the presented approach.

引用

页码：314 / 316

页数：3

共 7 条

[1]

[Anonymous], 2012, 2012 47 INT U POWER

[2] Design of manifold-coupled multiplexers [J].