Tunable 4-Pole Dual-Notch Filters for Cognitive Radios and Carrier Aggregation Systems

被引：22

作者：

Cho, Young-Ho ^{[1
]}

Rebeiz, Gabriel M. ^{[1
]}

机构：

[1] Univ Calif San Diego, Elect & Comp Engn Dept, La Jolla, CA 92023 USA

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2015年 / 63卷 / 04期

关键词：

Dual-band; independent control; notch filter; tunable filter;

D O I：

10.1109/TMTT.2015.2406706

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：

This paper presents 4-pole tunable dual-notch filters with independent frequency tuning for each notch response based on a stub-loaded resonator with asymmetrical loading capacitances. The resonator is designed based on lumped notch filters, and is folded on a three-layer epsilon(r) = 3.55 board for compact filter size. Frequency tuning is achieved using silicon varactor diodes. The first filter (Filter A) results in measured rejection of 47-53/49-52 dB at 0.71-1.01/1.10-1.45 GHz. The second filter (Filter B) shows rejection levels of 42-48/34-39 dB at 0.76-1.05/1.80-2.12 GHz. Also, tuning in one band has virtually no effect on the other band, showing high isolation between the two notches. Application areas are in cognitive radios and carrier aggregation systems with two transmit frequencies.

引用

页码：1308 / 1314

页数：7

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