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

Niamat Hussain1, Anees Abbas1, Sang-Myeong Park1, Seong Gyoon Park2, Nam Kim1,*

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: email

(This article belongs to this Special Issue: Advances in 5G Antenna Designs and Systems)

Computers, Materials & Continua 2022, 70(2), 3321-3331.


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.


Cite This Article

N. Hussain, A. Abbas, S. Park, S. Gyoon Park and N. Kim, "A compact tri-band antenna based on inverted-l stubs for smart devices," Computers, Materials & Continua, vol. 70, no.2, pp. 3321–3331, 2022.


cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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