A slot loaded rectangular antenna is designed to resonate at three distinct frequencies. Initially, a simulation software (CST Microwave Studio) was used to design the antenna. This device was assembled by introducing one slot near the center and the remaining slots on both sides of the central slot, placed diagonally, to observe frequency variation leading to tuning the designed frequency. The addition of slots on the patch with variations in feed point location shows multiband frequency tuning behavior at three resonant frequencies. Variations of the slots distance with respect to each other along with changing the feed point locations are studied with tuning of the resonant frequency within the same band (L and S-Band). The RL values are not degraded for both simulated and measured results; thus antenna performance is not disturbed by multiband frequency behavior.

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A slot loaded rectangular antenna is designed to resonate at two distinct frequencies. Initially, the antenna is designed using high frequency simulation software CST microwave Studio. The antenna is designed by introducing one slot near center and other slots on both side of the central slot, placed diagonally, to observe frequency variation leading to tuning the designed frequency. Addition of slots on the patch with variations in feed point location shows dual frequency tuning behavior at two resonant frequencies. Variations of the slot distance with respect to each other along with changing the feed point location is studied with tuning of the resonant frequency within the same band (L and S -Band). Both simulated and measured results indicate that RL values are not degraded thus performance of the antenna is not disturbed with dual frequency behavior of the antenna with tuning of the frequency/ frequencies.