Abstract
Abstract Terahertz switch is one of the key components of future communication, radar, and imaging systems. Limited by the strong electromagnetic coupling in subwavelength scale, the traditional terahertz switch is difficult to meet the increasing application requirements. In this paper, a parallel topology terahertz meta-chip switch based on the combination of equivalent circuit theory and electromagnetic coupling is proposed. The meta-chip is realized by adjusting the density of two-dimensional electron gas of InP-HEMT, which converts the electromagnetic coupling between the microstructure and microstrips. By using the 90 nm gate length InP-HEMT process, a C-ring loaded meta-chip is fabricated and tested in this paper. The results show an insertion loss lower than 1 dB with a 10 dB switching ratio, which is 20% higher than that without C-ring while ensuring the rather low insertion loss. It shows that the presented mechanism has positive significance for the design of terahertz band functional devices.
Highlights
Terahertz has wide applications in the next-generation communication, radar and imaging systems because of its high frequency and wide bandwidth [1,2,3,4]
The results show an insertion loss lower than 1 dB with a 10 dB switching ratio, which is 20% higher than that without C-ring while ensuring the rather low insertion loss
This paper presents a mechanism of parallel topology terahertz on-chip meta-switch circuit, which is named as meta-chip switch, based on the coupling of on-chip propagating waves between the microstrip branches, C-ring and InP-HEMTs
Summary
Terahertz has wide applications in the next-generation communication, radar and imaging systems because of its high frequency and wide bandwidth [1,2,3,4]. To obtain a promising switching ratio, many active materials are needed in a meta-switch to break the natural robustness from the periodical structure. This puts forward higher requirements for processing consistency and auxiliary feed circuit design. The results show an insertion loss lower than 1 dB with a 10 dB switching ratio, which is 20% higher than that without C-ring while ensuring the rather low insertion loss It indicates that the presented mechanism is conducive to enhancing the efficiency of the transistors in the circuit by electromagnetic coupling, which has positive significance for terahertz communication, radar, and imaging systems in the future
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