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This paper presents the design, fabrication and measurement of a low cost, reciprocal 4-bit phase shifter at 2.45 GHz ISM band using COTS components. High-pass/low-pass filters in π configuration are used to implement the phase shifter bit sections. SPDT switches are realized with BAP51 dual PIN diodes, with resonant inductors in the off-state to provide high isolation. The driver circuit consisting...
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