Notice of retraction
Vol. 32, No. 8(2), S&M2292

ISSN (print) 0914-4935
ISSN (online) 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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High-isolation Double-pole-double-throw Switch with Eighth-wavelength Transmission Lines for Wireless Sensors

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 50 Ω characteristic impedance to the ground. By using eighth-wavelength transmission lines, the isolation of the switch is highly improved. The performances 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 as high as 1.65 dB, and the isolation is 30 dB at a frequency of 2.4 GHz. Meanwhile, 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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