COMPACT QUASI SELF-COMPLEMENTARY ELLIPTICAL DISC MONOPOLE ANTENNA WITH TAPERED MICROSTRIP FEED LINE

Jasmine Mannil Abraham, G. Josemin Bala

Abstract: In this paper a compact elliptical disc monopole antenna with tapered microstrip feed line for UWB application is proposed. The antenna is designed using the quasi self -complementary technique for attaining electrical as well as physical size reduction. A triangular notch is included in the ground plane for impedance matching between the antenna and the RF front end. The adoption of this miniaturization technique has narrowed the impedance bandwidth of the antenna in the UWB range but lead to an additional operating bandwidth in Ku band thereby exhibiting dual band behavior. This reduction in the bandwidth in the UWB range was overcome by using the tapered microstrip feed line configuration. The antenna exhibited a wide impedance bandwidth extending beyond the UWB range and hence could be used for both UWB as well as Ku band applications. The antenna has a physical dimension of 16mm X 25mm corresponding to an electrical size of 0.24? and was designed on an FR4 substrate with er of 4.7. It is seen that the antenna proposed here has led to 62% size reduction with a percentage impedance bandwidth of 123.46% when compared with the conventional elliptical disc monopole antenna.

Keywords: Quasi self-complementary technique, planar monopole antennas, miniaturization, tapered microstrip feed line, bandwidth enhancement, UWB antennas

DOI: https://doi.org/10.15623/ijret.2014.0319041