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Varactor-loaded transmission-line phase shifter at C-band using lumped elements

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3 Author(s)
Ellinger, F. ; Electron. Lab., Eidgenossische Tech. Hochschule Zurich, Switzerland ; Jackel, H. ; Bachtold, Werner

The design of varactor-loaded transmission-line phase shifters using lumped elements is discussed in this paper. A monolithic-microwave integrated-circuit (MMIC) phase shifter is fabricated to verify the proposed topology. Only one control voltage is required for phase control. Within a continuously adjustable phase-control range of 360° and a frequency range from 5 to 6 GHz, a low transmission loss of 4 dB±1.7 dB is measured. The phase shifter is realized with a commercial 0.6-μm GaAs MESFET process and requires a chip area of only 0.8 mm2. To the knowledge of the authors, the best results reported to date are reached for a continuously adjustable passive phase shifter with comparable circuit size. The presented circuit is well suited to wireless adaptive antenna transceivers, operating in accordance with the 802.11a, high-performance radio local-area-network and high-speed wireless-access-network type-a standard.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:51 ,  Issue: 4 )

Date of Publication:

Apr 2003

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