DocumentCode :
3094199
Title :
Broadband and compact 3-dB MMIC directional coupler with lumped element
Author :
Nishikawa, Kiisa ; Kawashima, Mitsumasa ; Seki, Takaya ; Hiraga, Ken
Author_Institution :
NTT Corporation, Yokosuka, Japan
fYear :
2010
fDate :
23-28 May 2010
Firstpage :
1
Lastpage :
1
Abstract :
This paper proposed a broadband and compact 3-dB MMIC edge-coupled directional coupler. The proposed coupler consists of eight stepped-impedance coupled sections and a tiny capacitor. The capacitor is constructed by using the MIM capacitor process and is located on the center of the coupler. The capacitor and stepped structure effectively realize 3-dB coupling and enhanced amplitude/phase characteristics. A millimeter-wave prototype MMIC coupler is fabricated on the 100-µm thick GaAs substrate by using the GaAs pHEMT process. The total coupler length is only 440 µm. The fabricated coupler achieves a coupling loss of −4dB±0.5dB from 30 GHz to 69.3 GHz. The output amplitude and phase imbalances are less than 1.4 dB and 90 degrees ± 5 degrees at the same frequency range, respectively. The proposed MMIC coupler promises very compact and broadband MMIC.
Keywords :
Directional couplers; Frequency; Gallium arsenide; MIM capacitors; MMICs; Millimeter wave technology; PHEMTs; Prototypes;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location :
Anaheim, CA
ISSN :
0149-645X
Print_ISBN :
978-1-4244-6056-4
Electronic_ISBN :
0149-645X
Type :
conf
DOI :
10.1109/MWSYM.2010.5515160
Filename :
5515160
Link To Document :
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