Design of a C-band dual-polarized strip-FED aperture coupled stacked patch planar antenna array for point-to-point communication

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Author
Asbaş, Caner
Advisor
Ertürk, Vakur B.
Date
2017-09Publisher
Bilkent University
Language
English
Type
Thesis
Metadata
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http://hdl.handle.net/11693/33650Abstract
Point-to-point (P2P) communication is utilized where each communication node
knows the physical or electrical positions of the other. In this type of communication,
only two nodes transmit/receive message between each other and no other
node is included in this process. P2P communication o ers some advantages such
as lower power consumption, better information safety, lower vulnerablity to jamming
and better channel capacity usage. With these properties, it is preferred
frequently in military.
Directional antennas with high gain and low side lobe level (SLL) are desired
for P2P communication in order to achieve higher e ective communication distance,
lower power consumption and to decrease the interference between channels,
respectively. Another requirement is caused by Multiple-Input-Multiple-
Output capability, which is a technique to use dual or circularly polarized transreceiver
antennas instead of using separate transmitter and receiver antennas in
the system. For dual-polarized MIMO antennas, high cross polarization isolation
values are desired to separate the transmitting and receiving channels in order to
prevent them e ecting each other.
In this study, a C-band dual-polarized strip-fed aperture coupled stacked patch
antenna array for P2P communication is designed. To satsify the requirements of
P2P communication, the re
ection coe cient of the designed antenna is -10dB.
The gain is 20dB and SLL is better than -15dB in the cardinal and intercardinal
planes of the antenna for both polarizations. Additionally, 40dB cross polarization
isolation can be achieved. The idea is based on planar array of strip-fed
dual-polarized aperture coupled patch antennas with stripline feed networks. By adjusting the amplitude distribution on the feed network, -15dB SLL in both
cardinal and intercardinal planes is achieved for both polarizations. In order to
block the coupling between feed networks for di erent polarizations and prevent
distortion on amplitude and phase distributions, stripline feed networks are chosen.
In this way, cross polarization isolation can be increased as well. Hence, a
novel antenna element, dual-polarized strip-fed aperture coupled stacked patch
antenna is proposed. The parameters that a ect the impedance behaviour of
this type of antenna are investigated and examined in detail. Required feed networks
to achieve -15dB SLL in cardinal and intercardinal planes are designed.
The proposed antenna elements are placed in array sturucture, connected to feed
networks and the resulted antenna array is optimized and analyzed.