Design of A-shaped coaxial fed compact broadband antenna for WLAN/WiMAX/UWB lower-band applications

In this letter, a coaxially probe fed compact microstrip patch antenna is presented for broadband communication. The −10 dB impedance bandwidth of the proposed antenna is 4 GHz (2.27–6.23 GHz) and it covers WLAN 2.4/5.2/5.8 GHz, WiMAX 3.5/5.5, LTE-2500, UWB lower application bands. The proposed antenna is fabricated on 34 mm × 27 mm × 1.6 mm FR4 substrate. Instead of conventional U/H/E/C-shaped broadband patch, an “A-shaped” patch is proposed to achieve broadband operation. Miniaturization of the antenna is achieved due to two parallel slots at the rectangular ground plane. Further, frequency tuning in the proposed antenna is observed. A mathematical equation is presented for the cut-off frequency of the proposed antenna in terms of ground slot length and dielectric constant of the antenna substrate. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:848–853, 2017