Abstract
Novel design of multi-band Crescent shape microstrip antenna is proposed. Modifications in equivalent circular patch yields new resonant modes nearer to the TM11 and TM21 modes in circular patch that gives four band frequency response showing dual polarizations. Proposed design gives 1 to 1.5% of bandwidth at each frequency with broadside radiation pattern. The resonance frequency equation by defining the resonant length at each mode in the Crescent shape patch, is proposed. The frequency calculated using the same agrees closely with simulated result. The air suspended design of crescent shape patch is presented which yields co-polar peak gain of above 1.5 dBi.
Highlights
Multi-band antennas are needed in applications where signal trans-reception is carried out at closely spaced frequencies [1]
In this aspect microstrip antenna (MSA) offers design simplicity and flexibility where single radiating element with suitable modifications can cater to multiple frequencies [2], [3]
Multi-band MSAs have been realized either by cutting a slot in the patch or by placing stub on patch edges or by using multiple patches in the same configuration which caters to different frequency bands [3]-[10]
Summary
Multi-band antennas are needed in applications where signal trans-reception is carried out at closely spaced frequencies [1]. In MSAs different radiating patch shapes like rectangular/square, circular, equilateral triangular and compact variations like, ring and semi-circular shape, have been used [1]-[3] Using these radiating shapes, with reference to their fundamental and higher order modes, multi-band response can be realized pattern characteristics are not identical across each mode. Novel design of Crescent shape MSA embedded with rectangular slot is presented for multi-band dual polarized response. By studying modal current variations, resonant length formulation at fundamental and higher order modes of Crescent shape patch is presented. Widely reported slot cut techniques are used, but a new configuration of Crescent shape MSA is discussed with relevant resonant mode explanation and their formulation. Measurements using high frequency instruments like, ZVH – 8, FSC – 6 and SMB – 100A
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