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Sensors and Materials, Volume 33, Number 2(2) (2021)
Copyright(C) MYU K.K.
pp. 625-632
S&M2482 Research Paper of Special Issue
Published: February 16, 2021

High-isolation Double-pole-double-throw Switch with Eighth-wavelength Transmission Lines for Wireless Sensors [PDF]

Si-Da Tang and Kai-Li Wang

(Received February 9, 2020; Accepted August 28, 2020)

Keywords: DPDT, eighth wavelength, high isolation, switch

In this paper, we present the implementation of a novel structure of a double-pole-double-throw (DPDT) switch with eighth-wavelength transmission lines. The switch consists of eight diodes, eight eighth-wavelength transmission lines, and four frequency-optimized matching lines. It can be used as a single-pole-double-throw (SPDT) switch when one of the ports is terminated with a characteristic impedance of 50 Ω to the ground. By using eighth-wavelength transmission lines, the isolation of the switch is highly improved. The performance characteristics of the traditional quarter-wavelength SPDT and DPDT have also been evaluated for comparison with the proposed design. Measured results show that the insertion loss reaches a value as high as 1.65 dB, and the isolation is 30 dB at a frequency of 2.4 GHz. The size of the switch is nearly the same as that of the conventional quarter-wavelength DPDT switch. This novel switch can be used in wireless sensor applications.

Corresponding author: Si-Da Tang

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Cite this article
Si-Da Tang and Kai-Li Wang, High-isolation Double-pole-double-throw Switch with Eighth-wavelength Transmission Lines for Wireless Sensors, Sens. Mater., Vol. 33, No. 2, 2021, p. 625-632.

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