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Design of an Ultrawideband Monopole Antenna for Portable Radio Transceiver

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3 Author(s)
Marek E. Bialkowski ; School of ITEE, The University of Queensland, St Lucia, Brisbane, Australia ; Ahmad Rashidy Razali ; Ashkan Boldaji

This letter describes the design of a compact monopole antenna for use in a portable transceiver to access almost all modern wireless services from 850 MHz to 6 GHz. Initially, a microstrip-fed planar monopole of quarter-elliptical shape accompanied by a ground plane of 60 × 90 mm2 on FR-4 substrate is designed. To generate an ultrawide impedance bandwidth, this radiating element is accompanied by a parasitic microstrip stub and a ground plane cut. To reduce its projection area, the planar monopole is folded to occupy a volume of 13 × 60 × 5.6 mm3. This antenna is then fabricated and experimentally tested. Both simulation and experimental results show its operational band from 0.85 to 6 GHz, with reference to the 6-dB return loss (VSWR 3:1). Its radiation patterns are omnidirectional in the lower band and become directional at higher frequencies, with the gain varying between 1 and 7 dBi.

Published in:

IEEE Antennas and Wireless Propagation Letters  (Volume:9 )