Low Insertion-Loss Single-Pole–Double-Throw Reduced-Size Quarter-Wavelength HEMT Bandpass Filter Integrated Switches

Author

Lee, Jeffrey ; Lai, Ruei-Bin ; Chen, Chung-Chun ; Lin, Chin-Shen ; Lin, Kun-You ; Chiong, Chau-Ching ; Wang, Huei

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei

Volume

56

Issue

12

fYear

2008

Firstpage

3028

Lastpage

3038

Abstract

This paper proposes a circuit topology which reduces the chip size of single-pole-double-throw (SPDT) quarter-wavelength bandpass filter-integrated switches (FIS). A 40-GHz mHEMT MMIC SPDT switch has been implemented and demonstrates a measured insertion loss lower than 1 dB and an isolation better than 30 dB. Another 50-GHz pHEMT MMIC SPDT achieves 1.5 dB insertion loss and 22 dB isolation. The low insertion loss and high isolation shows that the circuit performance is improved along with the reduction of the size. The systematic design approach of the reduced-size FIS is described, together with the analysis of the insertion loss and isolation.

Keywords

HEMT integrated circuits; band-pass filters; field effect MIMIC; field effect transistor switches; microwave switches; millimetre wave filters; network topology; MMIC SPDT switch; chip size reduction; circuit topology; filter integrated switches; frequency 40 GHz; frequency 50 GHz; low insertion-loss switches; reduced-size quarter-wavelength HEMT bandpass filter; single-pole-double-throw switches; Filters; reduced-size; single-pole–double-throw (SPDT); switches;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2008.2007359

Filename

4682658