Ultra Sharp Transition-Band Low-pass Filter with Miniaturized Size for GSM Applications

被引：2

作者：

Karimi, Gholamreza ^{[1
]}

Golestanifar, Alireza ^{[2
]}

Ghaderi, Amirhossein ^{[2
]}

Salimpour, Navid ^{[2
]}

机构：

[1] Razi Univ, Fac Engn, Elect Dept, Kermanshah, Iran

[2] Islamic Azad Univ, Kermanshah Branch, Young Researchers & Elite Club, Kermanshah, Iran

来源：

RADIOENGINEERING | 2018年 / 27卷 / 02期

关键词：

Low-pass filter; T-shaped resonator; transmission zero; LC equivalent circuit; MICROSTRIP LOWPASS FILTER; WIDE STOPBAND; ROLL-OFF; COMPACT; DESIGN;

D O I：

10.13164/re.2018.0425

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, a microstrip low-pass filter (LPF) using a bended transmission line is presented. The LPF has a simple topology, which is composed of a T-shaped stub as main resonator, one conventional rectangular resonator (as suppressing stub) and two T-shaped stubs. To approach a high operation and small dimensions, this structure is bent. The proposed LPF has a compact size (0.090 lambda(g) x 0.119 lambda(g)) and presents an ultra sharp transition-band (xi = 880.95 dB/GHz) from 0.945 to 0.987 GHz with -3 and -40 dB suppression levels, respectively. This filter, with 3-dB cut-off frequency (f(c)) of 0.945 GHz, is useful for GSM applications. The performance of each section is investigated based on LC equivalent circuit. The designed filter is fabricated and measured. Also, the results exhibit an excellent figure of merit (FOM) of 239756.

引用

页码：425 / 430

页数：6

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