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Implementation of a wideband microstrip phased array antenna for X-band radar applications
Author(s)
Davids, Vernon Pete
Date Issued
2009
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
This thesis presents the design, analysis and implementation of an eight-element phased array
antenna for wideband X-band applications. The microstrip phased array antenna is designed
using eight quasi-Yagi antennas in a linear configuration and is printed on RT/Duroid
6010LM substrate made by Rogers Corporation. The feeding network entails a uniform
beamforming network as well as a non-uniform -25 dB Dolph-Tschebyscheff beamforming
network, each with and without 45° delay lines, generating a squinted beam 14° from
boresight. Antenna parameters such as gain, radiation patterns and impedance bandwidth
(BW) are investigated in the single element as well as the array environment. Mutual coupling
between the elements in the array is also predicted.
The quasi-Yagi radiator employed as radiating element in the array measured an exceptional
impedance bandwidth (BW) of 50% for a S11 < -10 dB from 6 GHz to 14 GHz, with 3 dB to
5 dB of absolute gain in the frequency range from 8 GHz to 11.5 GHz. The uniform broadside
array measured an impedance BW of 20% over the frequency band and a gain between 9 dB
to 11 dB, whereas the non-uniform broadside array measured a gain of 9 dB to 11 dB and an
impedance BW of 14.5%. Radiation patterns are stable across the X-band. Beam scanning is
illustrated in the E-plane for the uniform array as well as for the non-uniform array.
antenna for wideband X-band applications. The microstrip phased array antenna is designed
using eight quasi-Yagi antennas in a linear configuration and is printed on RT/Duroid
6010LM substrate made by Rogers Corporation. The feeding network entails a uniform
beamforming network as well as a non-uniform -25 dB Dolph-Tschebyscheff beamforming
network, each with and without 45° delay lines, generating a squinted beam 14° from
boresight. Antenna parameters such as gain, radiation patterns and impedance bandwidth
(BW) are investigated in the single element as well as the array environment. Mutual coupling
between the elements in the array is also predicted.
The quasi-Yagi radiator employed as radiating element in the array measured an exceptional
impedance bandwidth (BW) of 50% for a S11 < -10 dB from 6 GHz to 14 GHz, with 3 dB to
5 dB of absolute gain in the frequency range from 8 GHz to 11.5 GHz. The uniform broadside
array measured an impedance BW of 20% over the frequency band and a gain between 9 dB
to 11 dB, whereas the non-uniform broadside array measured a gain of 9 dB to 11 dB and an
impedance BW of 14.5%. Radiation patterns are stable across the X-band. Beam scanning is
illustrated in the E-plane for the uniform array as well as for the non-uniform array.
Additional information
Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2009
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Implementation of a wideband microstrip phased array antenna for x-band radar applications.pdf
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