Abstract
Circularly polarized microstrip antenna is frequently realized by cutting the slot inside the patch and feeding it along the diagonal axis. In the reported literature, procedure to design them at any given frequency is not available. In proposed work, circularly polarized slot cut circular microstrip antenna at 900 MHz is discussed. By studying the surface current distributions at two orthogonal modes, formulations in their resonant length are proposed. The frequencies calculated using them closely agree with simulated results. Using proposed formulation, procedure to design circular polarized antennas at different frequencies is presented that gives circular polarized response. Thus, proposed work will be helpful to design similar circular polarized circular microstrip antenna at any desired frequency.
Highlights
The circular polarized (CP) microstrip antenna (MSA) is realized either by cutting narrow slot inside the coaxially fed MSA or by using dual feeds in conjunction with the power divider network, or by cutting asymmetrical U-slot or rectangular slot at an appropriate position inside the patch [1]-[11]
As the slot cut CP circular MSA (CMSA) is optimized on lossy substrate, the gain is less than 0 dBi
In slot cut CP CMSAs at 900 MHz, slot length (l) is 0.02λ0 whereas feed point is placed along the diagonal axis, i.e. at xf = yf = 0.06λ0
Summary
The circular polarized (CP) microstrip antenna (MSA) is realized either by cutting narrow slot inside the coaxially fed MSA or by using dual feeds in conjunction with the power divider network, or by cutting asymmetrical U-slot or rectangular slot at an appropriate position inside the patch [1]-[11] Amongst these techniques, U-slot or rectangular slot cut MSAs yields optimum response in terms of gain and axial ratio (AR) bandwidth (BW) [9]-[11]. Using proposed formulations, procedure to design slot cut CP CMSA at any other frequency in non-suspended and suspended configuration is presented It gives CP response with formation of small loop inside VSWR = 2 circle and with the broadside radiation pattern that shows co and cross polarization levels within 3 dB in E and H-planes. The measurement was carried out in antenna lab wherein required minimum far field distance was kept between reference antenna and antenna under test
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