Design And Research Of Single-Sided Slotted Waveguide Antenna With A Large Beam Declination

The slot of the conventional longitudinal slot antenna is alternately opened on both sides of the broadside. A novel single-sided slot array with a large-declination (biased towards the load) is proposed, in which the slots are only biased to the same side of the waveguide broadside. The main beam declination of a single-sided slot antenna is only biased towards the load direction and is only related to the broad-side of the waveguide. To verify the theoretical analysis, a single-sided slot array with 10-slot was simulated, fabricated, and measured. According to the measured results, the antenna achieved a beam declination of 25 degrees and a sidelobe level below -22 dB, which is in good agreement with the theoretical analysis. Furthermore, the main beam declination of the single-sided slot and the traditional double-sided slot array has been thoroughly studied and compared. When the main beam has a large declination angle (>30 degrees) to the load, a single-sided slot array is the only choice.