volume | PIER Journals

Abstract

In this paper, an elliptical monopole antenna is modified and loaded with stubs and slots to improve filtering characteristics over tri-band operation. As the surface current is concentrated at the periphery of the monopole and decreases away from the feed, therefore, a slotted elliptical monopole is designed and sliced from the top. A rectangular strip is added at the top and center to create two symmetrical loops. A slot in each loop at a different position causes the antenna to operate over dual/tri-bands. A rectangular stub is added in the feed-line to improve the band-stop/filtering characteristics. The parameters of the structure are optimized to obtain S₁₁ ≤ -10 dB over 3.22-3.64 GHz, 5.53-6.03 GHz and 6.71-7.14 GHz for 5G, V2X, WLAN and Wi-Fi 6E applications. The three bands can be tuned independently. The compact 0.171λ₀ × 0.184λ₀ antenna, fabricated on 1.6 mm FR4 substrate (λ₀ is the free-space wavelength at 3.22 GHz), offers maximum S₁₁ of -0.9 dB and -4.9 dB, respectively, between the lower and middle bands and middle and upper bands. Minimum S₁₁ of -55 dB, -25 dB and -27 dB are obtained over the lower, middle, and upper bands respectively. The measured results validate the simulation ones.

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Ms. Sheetal Mete

Prof. Jagadish Jadhav

Professor Brijesh Iyer

Professor Anjali Rochkari

Professor Sanjay Laxmikant Nalbalwar