TY  - EJOU
AU  - Hussain, Niamat 
AU  - Abbas, Anees 
AU  - Park, Sang-Myeong 
AU  - Park, Seong Gyoon 
AU  - Kim, Nam 

TI  - A Compact Tri-Band Antenna Based on Inverted-L Stubs for Smart Devices
T2  - Computers, Materials \& Continua

PY  - 2022
VL  - 70
IS  - 2
SN  - 1546-2226

AB  - 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 <i>via</i> 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 mm<sup>3</sup>. 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.
KW  - Multiband antenna; compact antenna; tri-band antenna; CPW antenna; stub-loaded antenna

DO  - 10.32604/cmc.2022.020688