Adjustable Phase Shifter Design for Butler Matrix Feeding Network in 2.45 GHz Wireless Communication Applications
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Keywords:
Butler Matrix, Phase Shifter, CRLH, Varactor Diodes, Phased Array AntennaAbstract
This study focuses on developing an adjustable voltage-controlled phase shifter design,
specifically for integration with the Butler Matrix, which is used as a feed network for phased array
antennas. The key element of the phase shifter design is varactor diodes. These diodes' capacitance can be
varied by adjusting the DC voltage, allowing for up to a 100-degree phase shift. The design utilizes left
hand and right-hand transmission line methods for effective phase control. The varactor diodes in the design
operate within a voltage range of 5 V to 15 V and offer ten distinct capacitance settings. Mitigating is the
impact of the DC voltage on the RF signals at both the input and output, the design includes two interdigital
capacitors. Additionally, two spiral inductors are incorporated to isolate the RF signals from the DC supply.
The phase shifter is designed on an FR-4 substrate and is tuned to function at a frequency of 2.45 GHz,
making it suitable primarily for Butler Matrix network applications in phased array antenna systems. The
overall size of proposed phase shifter is 53.23 x 30 mm2. The reflection coefficient and insertion loss are
within acceptable limits for its intended use in a 2.45 GHz Butler matrix feeding network application.
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