Broadband and Improved Radiation Characteristics of Aperture-Coupled Stacked Microstrip Antenna for Mobile Communications

Sajal Kumar PALIT

School of Engineering and Advanced Technology,

Massey University, Wellington, New Zealand

E-mail: S.Palit@massey.ac.nz

Received: 15 October 2007 /Accepted: 20 February 2008 /Published: 15 April 2008

Abstract: A new broadband microstrip antenna has been reported in this paper. A significant breakthrough in bandwidth enhancement has been achieved by optimizing the antenna’s dimensions, substrate materials, substrate thickness, aperture dimensions and by positioning a thin conductor at a particular angle as a reflector to stop the back radiation. The measured ultra-bandwidth has been found to be 73% at VSWR = 2.0 at 850 MHz. The gain of the modified microstrip antenna has also improved from 8.6 dB to 9.2 dB. It is found that the back radiation has reduced significantly due to the conducting plane inserted below the microstrip feed line. The front-to-back ratio has improved from 12 dB to 20 dB. This antenna can find useful applications in wireless communications.

Keywords: Microstrip antenna, Broadband, Stacked patch, Substrate, Aperture-coupled

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