DESIGN OF A HIGH BAND ISOLATION DIPLEXER FOR GPS AND WLAN SYSTEM USING MODIFIED STEPPED-IMPEDANCE RESONATORS

被引：25

作者：

Yang, R. -Y. ^{[2
]}

Hsiung, C. -M. ^{[3
]}

Hung, C. -Y. ^{[1
]}

Lin, C. -C. ^{[3
]}

机构：

[1] Tung Fang Inst Technol, Dept Elect Engn & Comp Sci, Hunei Shiang 829, Kaohsiung Cty, Taiwan

[2] Natl Ping Tung Univ Sci & Technol, Dept Mat Engn, Neipu Township 91201, Pingtung Cty, Taiwan

[3] Natl Ping Tung Univ Sci & Technol, Dept Mech Engn, Neipu Township 91207, Pingtung Cty, Taiwan

来源：

PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER | 2010年 / 107卷

关键词：

WIDE; FILTER; STOPBAND;

D O I：

10.2528/PIER10060913

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 paper, we presented the design of a high performance diplexer for applications of global positioning system (GPS) at 1.575 GHz and wireless local area network (WLAN) at 2.4 GHz, simultaneously. Two bandpass filters (BPFs) using the modified stepped-impedance resonators (SIRs) operated at 1.575 GHz and 2.4 GHz are the main blocks for the proposed diplexer. By discussing and analyzing the admittance of the even and odd modes, the transmission zero of the modified SIR can be found, and the location of the transmission zero can be precisely predicted, thus having a wide and deep stopband for the BPFs, useful for the high performance diplexer. Furthermore, due to the appearance of the transmission zeros near the passband edges, the passband selectivity of the BPFs as well as the diplexer can be improved. By using the impedance matching between two BPFs, a high isolation of 5 dB between two channels is obtained. The proposed diplexer was designed, fabricated and measured. The simulated and measured results had a good agreement with the proposed design concept.

引用

页码：101 / 114

页数：14

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