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Limited literature is available on triangular waveguides and triangular waveguide fed slot antennas, as compared to their rectangular and circular waveguide counterparts. In this paper, simulated and measured results have been presented for a right angled isosceles triangular waveguide fed slot antenna in S band. The antenna has been simulated and then fabricated in aluminium material. Simulated and experimental results show good agreement in resonant frequency. This work can be used in the design of a triangular waveguide fed low cost slot array.

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