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A compact attenuator integrated phase shifter with switchable trimode operations
Author(s) -
Lee HanLim,
Park DongHoon,
Moon SeongMo,
Lee MoonQue,
Yu JongWon
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28448
Subject(s) - attenuator (electronics) , phase shift module , computer science , electronic engineering , materials science , electrical engineering , optoelectronics , engineering , physics , insertion loss , optics , attenuation
This article presents a compact attenuator integrated phase shifter with switchable trimode operations. The proposed structure consists of simple reflection‐type attenuator and phase shifter with Lange coupler for wideband performance. The reflective circuits for attenuator and phase shifter are implemented with HEMT's and varactor diodes. By separately adjusting the control voltages for attenuator and phase shifter, the designed circuit can operate in trimode: attenuation‐mode, phase shift‐mode (PS‐mode), and loss variation compensated phase shift‐mode (LVC‐PS‐mode). The proposed circuit is implemented in 0.15‐µm GaAs low noise pHEMT process and provides the input and output return losses always better than 12 and 15 dB, respectively. Using LVC‐PS‐mode, the measured maximum phase shifting range of 80° with the measured insertion loss variation within ±0.05 dB from 15 to 25 GHz can be achieved. The chip size of the fabricated core is about 1.5 × 0.65 mm 2 excluding test pads. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1798–1800, 2014