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Multi-band microstrip antennas have been commonly realized by using techniques of stub or slot. In these designs, knowledge about correct positioning of stub or slot and their effects on patch resonant modes in terms of their frequency and impedance variation is needed. In this paper, with reference to a variation of slot cut circular microstrip antenna, a detailed study that provides an insight into functioning of multi-band dual polarized antenna is presented. The slots degenerate patch first two resonant modes into dual orthogonal modes to give multiple frequency response with dual polarization. The resonant length formulations at modified degenerated circular patch modes are presented. The frequencies calculated using them match closely with the simulated frequencies. For gain enhancement, air suspended design of slot cut antenna is presented which gives broadside gain of 1.5 to 6 dBi across multiple frequencies. Thus, the present work explains the functioning of multi-band antenna in terms of patch modes and will serve as a tutorial for analyzing similar multi-band dual polarized configurations.

Multi-band Dual Polarized Variations of Modified Circular Microstrip Antennas