Abstract
In this paper, a new strategy for the design of a single-layer wideband phase shifter is proposed. The phase shifter employs the 7th order multimode resonator and does not require any coupling structure. Assuming a specific return loss (e.g. 15, 20 and 25 dB), the phase shifter is analyzed for a variety of phase shifts (e.g. 45° to 270°) in differential mode. To validate this design, a wideband phase shifter with phase shift of 90° ± 4.4° is fabricated in the frequency range of 2.2–7.35 GHz, which implies 107.8% fractional bandwidth. The fabricated phase shifter has a return loss of S11<-17.27dB and an insertion loss of S21>-1.28dB. The synthesized, simulated, and measured results are in good agreement with each other.
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