Open Access

ARTICLE

A Compact Tri-Band Antenna Based on Inverted-L Stubs for Smart Devices

Niamat Hussain¹, Anees Abbas¹, Sang-Myeong Park¹, Seong Gyoon Park², Nam Kim^1,*
1 Department of Information and Communication Engineering, Chungbuk National University, Cheongju, 28644, Korea
2 Department of Information and Communication Engineering, Kongju National University, Kongju, 32588, Korea
* Corresponding Author: Nam Kim. Email:
(This article belongs to this Special Issue: Advances in 5G Antenna Designs and Systems)

Computers, Materials & Continua 2022, 70(2), 3321-3331. https://doi.org/10.32604/cmc.2022.020688

Received 02 June 2021; Accepted 03 July 2021; Issue published 27 September 2021

Abstract

We designed and constructed a novel, compact tri-band monopole antenna for intelligent devices. Multiband behavior was achieved by placing inverted-L shaped stubs of various lengths in a triangular monopole antenna fed by a coplanar waveguide. The resonance frequency of each band can be controlled by varying the length of the corresponding stub. Three bands, at 2.4 (2.37–2.51), 3.5 (3.34–3.71), and 5.5 (4.6–6.4) GHz, were easily obtained using three stubs of different lengths. For miniaturization, a portion of the longest stub (at 2.4 GHz) was printed on the opposite side of the substrate, and connected to the main stub via a shorting pin. To validate the concept, the antenna was fabricated on a low-cost 1.6-mm-thick FR-4 substrate with dimensions of 20 × 15 × 1.6 mm³. The antenna exhibited a moderate average gain of 2.9 dBi with an omnidirectional radiations over the bandwidths required for RFID, Bluetooth, ISM, WiMAX, and WLAN-band applications. These features make the antenna suitable for compact smart devices.

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Keywords

Multiband antenna; compact antenna; tri-band antenna; CPW antenna; stub-loaded antenna

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Citations