In this paper, we have presented a novel filtering leaky wave antenna using radiative band-pass filter concept in rectangular waveguide technology. The design methodology achieves radiation by utilizing slots in each of the resonator cavities of an iris coupled band-pass filter. For proof of concept, an 8th order filtering leaky wave antenna is designed, fabricated, and tested at a center frequency of 9.7 GHz with a fractional bandwidth of 4.6 %. Furthermore, the radiation pattern of the filtering leaky wave antenna exhibits beam scanning 30 degrees in the entire operating band with a peak realized gain of 13.3 dBi. The beam scanning rate of the proposed filtering antenna is 6.5 degree per fractional bandwidth. The proposed methodology is scalable to realize high gain leaky wave antennas with higher order filtering response. Furthermore, it offers multifunctionality within the same size of the waveguide band-pass filter, thereby contributing to the overall system miniaturization.
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