Two SPDT switches that have low insertion loss with impedance-transformation networks are presented.The proposed SPDT switches are comprised of two shunt PIN s and two quarterwavelength microstrip lines together with impedance transformation networks, which canceled the capacitance effect at off-state and the inductance effect at on-state simultaneously.The simulated insertion loss performance is less than 0.3 dB and the fabricated ones exhibit on-state low insertion loss of 0.5 dB within the range of 4.6-4.8GHz.
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Liu et al. (2013) studied this question.
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