Design of a super-wideband on-chip antenna with improved characteristics using bulk micromachining

Autor: Rajat Mahapatra, Ashis Kumar Mal, Sujit Kumar Mandal, Sanjukta Mandal
Rok vydání: 2021
Předmět:
Zdroj: Microsystem Technologies. 28:937-946
ISSN: 1432-1858
0946-7076
Popis: In this article, a novel, miniaturized, CPW fed, monopole on-chip antenna with enhanced bandwidth and gain is proposed for super wideband (SWB) application. First, an SWB on-chip antenna of size 4.2 × 4.2 × 0.6775 mm3 is designed by incorporating slots in the rectangular radiating patch. The operating frequency band of the designed antenna is observed as 0.7–17.5 GHz providing a bandwidth ratio and a fractional bandwidth of 25 and 184.62%, respectively, and the maximum gain is obtained as − 5.7 dBi. Then, an air cavity is introduced just beneath the patch using bulk micromachining technique. Introduction of the air cavity improves the bandwidth and gain of the antenna. The proposed antenna now achieves |S11| ≤ − 10 dB from 0.7 to 21.8 GHz, offering a bandwidth ratio and a fractional bandwidth of 31.14 and 187.56%, respectively. The micromachined SWB antenna offers the highest bandwidth dimension ratio (BDR) among the related reported works. The proposed antenna offers a stable radiation pattern over the entire wide impedance bandwidth and provides a maximum gain of − 1.8 dBi. It also exhibits good time-domain characteristics having group delay variation of less than 1.25 ns throughout the operating bandwidth. The proposed antenna prototype is fabricated and tested as well. A good agreement is observed between the simulated results and the experimental outcomes.
Databáze: OpenAIRE
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