Quasi-Transmission-Line Variable Reactance Circuits for a Wide Variable-Phase Range X-Band Monolithic Phase Shifter


IEICE TRANSACTIONS on Electronics   Vol.E80-C       pp.168-173
Publication Date: 1997/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Category: Microwave and Millimeter Wave Technology
phase shifter,  transmission line,  quadrature hybrid,  shunt capacitor,  reflection,  

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This paper describes a novel quasi-transmission-line variable-reactance circuit that extends the variable-phase range of phase shifters. It consists of a transmission line and two shunt varactors. By appropriately choosing the characteristic impedance and electrical length of the transmission line, the variable-phase range can be significantly increased. Since the proposed circuit can be fabricated by the conventional MESFET process, a phase shifter can be integrated with other functional circuits. This enables fully monolithic integration of RF circuits as a one-chip multi-functional MMIC in radio communication systems. The variable-phase range of the prototype X-band monolithic phase shifter is 208 degrees, which is approximately four times as large as that of conventional one.