Tunable 500-1200-MHz Dual-Band and Wide Bandwidth Notch Filters Using RF Transformers

被引:25
作者
Ko, Chih-Hsiang [1 ]
Tran, Allen [1 ]
Rebeiz, Gabriel M. [2 ]
机构
[1] Qualcomm Technol Inc, San Diego, CA 92121 USA
[2] Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA
关键词
Bandstop filter; dual-band filter; notch filter and transformer; tunable filter;
D O I
10.1109/TMTT.2015.2420559
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 a novel tunable dual-band bandstop filter based on doubly tuned RF transformers. This design results in two distinct notch frequencies in a single resonator using silicon varactor diodes. The 2-pole tunable dual-band bandstop filters are implemented using printed circuit board (PCB) transformers and air-coil transformers. With PCB transformers, the lower frequency can be tuned at 513-845 MHz while the higher frequency can be tuned at 715-1151 MHz with a notch level dB. With air-coil transformers, a single-band 2-pole notch filter with wide rejection bandwidth is achieved. The design results in 604-982 MHz tuning with a 20-dB rejection bandwidth of 27-45 MHz. Also, by implementing a series varactor in a transformer, the separation between two coupled frequencies can be changed. The topology can be easily extended to higher order filters and design equations are presented.
引用
收藏
页码:1854 / 1862
页数:9
相关论文
共 19 条
[11]   Extended Passband Bandstop Filter Cascade With Continuous 0.85-6.6-GHz Coverage [J].
Naglich, Eric J. ;
Lee, Juseop ;
Peroulis, Dimitrios ;
Chappell, William J. .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2012, 60 (01) :21-30
[12]   Lumped-Element Fully Tunable Bandstop Filters for Cognitive Radio Applications [J].
Ou, Yu-Chin ;
Rebeiz, Gabriel M. .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2011, 59 (10) :2461-2468
[13]   Compact Low-Loss Tunable X-Band Bandstop Filter With Miniature RF-MEMS Switches [J].
Reines, Isak ;
Park, Sang-June ;
Rebeiz, Gabriel M. .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2010, 58 (07) :1887-1895
[14]  
Saxena S., 2009, MICROW COMMUN ANTENN, P1
[15]  
Snow T, 2013, IEEE MTT S INT MICR
[16]   Dual-band bandpass and bandstop filters using composite right/left-handed metamaterial transmission lines [J].
Tseng, Chao-Hsiung ;
Itoh, Tatsuo .
2006 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-5, 2006, :931-+
[17]   A tunable bandstop resonator based on a compact slotted ground structure [J].
Wang, Xiao-Hua ;
Wang, Bing-Zhong ;
Zhang, Hualiang ;
Chen, Kevin J. .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2007, 55 (09) :1912-1918
[18]  
Wang Y, 2012, PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION 2010, VOL 11, P1
[19]  
Zhewang Ma, 2006, Proceedings of 2006 Asia Pacific Microwave Conference, P1174, DOI 10.1109/APMC.2006.4429616