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Design and analysis of a microwave large-range variable phase-shifter based on an injection-locked harmonic self-oscillating mixer

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4 Author(s)
Hoeye, S.V. ; Dept. of Electr. Eng., Univ. of Oviedo, Gijon, Spain ; Herran, L.F. ; Fernandez, M. ; Heras, F.L.

In this letter, a new microwave variable phase-shifter based on an injection-locked harmonic self-oscillating mixer, is presented for its application in an active microstrip phased antenna array. The circuit provides the double functionality of variable phase-shifter and down-converter. Maximum conversion gain is obtained, through the optimization of a new multi-harmonic load at the input-port of the circuit. The ranges of synchronized operation are analyzed versus the circuit parameters and the corresponding phase-shifts are calculated. The stability of the synchronized solutions is analyzed using the envelope transient simulation method. An 11.25-1.5-GHz down-converter with a 3.25-GHz free-running frequency has been designed, providing a phase-shift variation at intermediate frequency up to 540°, with a 4.5-dB conversion gain. A good agreement between the simulated and experimental results has been found.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:16 ,  Issue: 6 )