Design of Modified Z-Shaped and T-Shaped Microstrip Filter Based on Transfer Function Analysis

Gh Karimi*, H. Siahkamari, F. Khamin Hamedani, A. Lalbakhsh

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A new microstrip lowpass filter with compact size, ultra-wide stopband and sharp cutoff frequency is proposed. To achieve an ultra-wide stopband and sharp cutoff frequency, two Z-shaped resonators are added to the filter. To reduce the circuit size of the filter, cursive transmission line is also introduced. Moreover, exact equation for the most important transmission zeroes are obtained based on LC equivalent circuit and transfer function. A demonstration filter with 3 dB cut-off frequency at 1.89 has been designed, fabricated and measured. The results show a relative stopband bandwidth of 166.3 % (referred to suppression degree of 25 dB), and a high figure of merit of 32,613.

Original languageEnglish
Pages (from-to)2005-2016
Number of pages12
JournalWireless Personal Communications
Volume82
Issue number4
DOIs
Publication statusPublished - 29 Jun 2015
Externally publishedYes

Keywords

  • Micriostrip lowpass filter
  • Transfer function
  • Transmission zero
  • Ultra wide stopband

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