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Six-port QPSK demodulator for optimal K-band multiport amplifier calibrationopen access

Authors
Lee, Han LimMoon, Seong-MoLee, Moon-QueYu, Jong Won
Issue Date
Apr-2014
Publisher
INST ENGINEERING TECHNOLOGY-IET
Citation
ELECTRONICS LETTERS, v.50, no.8, pp 617 - +
Journal Title
ELECTRONICS LETTERS
Volume
50
Number
8
Start Page
617
End Page
+
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/67672
DOI
10.1049/el.2013.4147
ISSN
0013-5194
1350-911X
Abstract
A wideband six-port-based demodulator is proposed and applied as a quadrature phase shift keying (QPSK) demodulator for optimal K-band multiport amplifier (MPA) calibration circuitry. The proposed six-port demodulator adopts wideband ring hybrids for optimal 180 degrees phase balance in local oscillator signal paths. In addition, a voltage-controlled reflection-type phase shifter and an attenuator are integrated into the six-port structure to ensure accurate magnitude and phase balance over broadband operation, resulting in optimal phase and amplitude error detection for the MPA system. To verify the proposed structure, RF demodulation of the K-band QPSK modulated signal was demonstrated for purpose of MPA calibration.
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Lee, Han Lim
창의ICT공과대학 (전자전기공학부)
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