Single-chip integration of electronically switchable bandpass filter for 3.5GHz WiMAX application

Wei Hung Liao, Chang Sheng Chen, Yo Shen Lin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations

Abstract

This paper demonstrates the design and implementation of a miniaturized bandpass filter integrated with switch function in commercial GaAs pHEMT process for 3.5GHz Wi MAX application. A tapped-input, capacitive-loaded hairpincomb bandpass filter is proposed to benefit from the high-density metal-insulator-metal capacitor in the GaAs process, such that the required electrical length of coupled-line is only 13.3 degree at the center frequency and the filter size can be largely reduced. The proposed integrated bandpass filter features low in-band insertion loss as well as a wide 30-dB rejection-band up to 33.8 GHz. The filter size is only 1.22 mm×O.61 mm, and is realized in a chip size of 1.5 mmx1.0 mm. Then, by adding two D-mode FETs in the pHEMT process, the proposed filter can be switched on and off electronically. Low-loss bandpass response with wide rejection band in the "filter on" state and wideband 35-dB isolation from DC up to 28.7 GHz in the "filter off' state are achieved. The chip size of this switchable bandpass filter is only 2.0 mm×1.0 mm.

Original languageEnglish
Title of host publication2010 IEEE MTT-S International Microwave Symposium, MTT 2010
Pages1368-1371
Number of pages4
DOIs
StatePublished - 2010
Event2010 IEEE MTT-S International Microwave Symposium, MTT 2010 - Anaheim, CA, United States
Duration: 23 May 201028 May 2010

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X

Conference

Conference2010 IEEE MTT-S International Microwave Symposium, MTT 2010
Country/TerritoryUnited States
CityAnaheim, CA
Period23/05/1028/05/10

Keywords

  • Bandpass filter
  • Capacitive loaded
  • GaAs
  • Hairpin
  • Switchable

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