准椭圆函数滤波器的边带优化设计

J4 ›› 2009, Vol. 36 ›› Issue (3): 448-467.

• Original Articles • Previous Articles Next Articles

Band-edge optimization design of the quasi-elliptic filter

ZHU Yong-zhong^1,2;XIE Yong-jun¹;XIE Wen-xuan³;LI Ya-feng¹

(1. Key Lab. of Antennas and Microwave Technology, Xidian Univ., Xi'an 710071， China;
2. School of Information Eng., Chang'an Univ., Xi'an 710064， China;
3. The National Research Inst. of Radio Spectrum Management, Xi'an 710061， China)

Received:2008-01-24 Revised:2008-05-18 Online:2009-06-20 Published:2009-07-04
Contact: ZHU Yong-zhong E-mail:bsos1980@tom.com

Abstract

Abstract:

A new technique is presented for maximizing the band-edge selectivity of elliptic filters, and then the equal ripple parameter of the quasi-elliptic function can be calculated when the band-edge selectivities of the elliptic function and quasi-elliptic function are the same. The quasi-elliptic function based on the method not only keeps the bandwidth invariable, but effectively narrows the transition band. Finally, a novel quasi-elliptic microstrip filter composed of four spiral stepped-impedance resonators (SIR) is designed. Measured results show that the filter acquires 15％ size reduction and 20 MHz transition band reduction, but can also effectively inhibit the second and third harmonics.

Key words: quasi-elliptic function, cross-coupling, transmission zero, band-edge characteristics, band-edge characteristics

CLC Number:

TN713. 5

ZHU Yong-zhong1,2;XIE Yong-jun1;XIE Wen-xuan3;LI Ya-feng1. Band-edge optimization design of the quasi-elliptic filter[J].J4, 2009, 36(3): 448-467.

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Band-edge optimization design of the quasi-elliptic filter

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