Smaller-loss planar SPP transmission line than conventional microstrip in microwave frequencies.

Hao Chi Zhang,Yifeng Fan,Qian Zhang,Jun Feng Liu,Tie Jun Cui,Wenxuan Tang

doi:10.1038/srep23396

Hao Chi Zhang, Yifeng Fan + Show 4 more

Open Access

https://doi.org/10.1038/srep23396

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Journal: Scientific reports	Publication Date: Mar 17, 2016
Citations: 76	License type: CC BY 4.0

Affiliation: Southeast University

Abstract

Transmission line is a basic component in all passive devices, integrated circuits, and systems. Microstrip is the most popular transmission line in the microwave and millimeter-wave frequencies, and has been widely used in current electronic devices, circuits, and systems. One of the important issues to be solved in such applications is the relatively large transmission loss of microstrip. Here, we propose a method to reduce the loss of microwave transmission line based on the designable wavenumber of spoof surface plasmon polaritons (SPPs). Using this characteristic, we analyze and experimentally demonstrate the low-loss feature of the SPP transmission line through the perturbation method and S-parameter measurements, respectively. Both simulation and experimental results show that the SPP transmission line has much smaller transmission loss than traditional microstrip with the same size in the microwave frequencies. Hence, the spoof SPP transmission line may make a big step forward in the low-loss circuits and systems.

Highlights

The loss of microwave transmission line (TL) is an important issue in the modern electronic systems, which may lead to signal distortions and heating problems[1]
We investigate the transmission loss of spoof surface plasmon polaritons (SPPs) TL, and further structure a kind of low-loss SPP TL
We design and fabricate a low-loss SPP TL sample and a traditional microstrip TL under the same geometrical configuration. Both numerical simulations and experimental results show that the loss in the SPP TL is much lower than that in the microstrip in a wide frequency band from 2 to 10 GHz, which can help to build up low-loss circuits and systems in the future

Summary

Result

Different from the feature in optical frequencies, metals show the PEC characteristics in microwave frequencies of. In both TLs, the high transmission coefficients imply that the two conversions achieve a smooth bridge between different structures; and on the other hand, the radiation losses are very small.

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