Measurement of a microstrip antenna array fed by transverse slots on a broad wall of the rectangular waveguide with standing-wave excitation for linear polarization parallel to the axis

This paper presents measurement of a microstrip antenna array fed by transverse slots on a broad wall of the rectangular waveguide with standing wave excitation for linear polarization parallel to the axis. A series-fed two-element microstrip antenna array on a dielectric substrate excited by a transverses slot of the waveguide is used as an element of the proposed array for grating lobe suppression due to the transverse slots. In this paper, a prototype array consisting of six microstrip antennas fed by three transverse slots on the broad wall of the rectangular waveguide with standing-wave excitation is designed and fabricated. The measured results are agreed with the simulated ones obtained by HFSS. The measured radiation pattern reveals that grading lobes due to the transverse slots are well reduced by the proposed array. Validity of the design of the proposed array is confirmed by the measurement.