Abstract
A microstrip slot antenna for C Band has been proposed with compact structure and suppressed back radiation. In this paper, the feeding technique used is aperture coupling with a modification that patches and the feed line are positioned below the substrate and the slot is etched above the substrate. The position of the patches along the slot axis is kept at the negative peak of the standing wave distributions to generate the voltage null on the slot line so as to have a 180º phase shift in the centre of the patch hence achieving better front to back ratio. Also the gain of 6.774dB is achieved in this design. The results are validated by simulation measurements.
Highlights
Microwave slot antennas have broad interest in military and commercial applications mainly due to the low profile, low cost as well as being simple to manufacture
The slot antennas are quite incorporated with planar and non planar surfaces and have more degrees of freedom than a conventional design[1]-[3]. In spite of these advantages, it has the main disadvantage of back radiation, which limits its use in mobile communication
This is the proposed slot antenna in which there are two slots above the substrate and the patches are under the substrate
Summary
Microwave slot antennas have broad interest in military and commercial applications mainly due to the low profile, low cost as well as being simple to manufacture. The slot antennas are quite incorporated with planar and non planar surfaces and have more degrees of freedom than a conventional design[1]-[3] In spite of these advantages, it has the main disadvantage of back radiation, which limits its use in mobile communication. Several methods have been proposed to suppress the back lobe, such as by using array topology [5], a tapered-loaded antenna [6] and a 2 wavelength Microwave Leaky Wave Antenna with coaxial probe coupled patch antenna arrays [7] These methods supported parallel plate modes, producing undesired radiation. We will study the design, operation mechanism and simulation results of our proposed antenna
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