A novel untilted edge-slotted waveguide antenna, array with very low cross-polarization is presented, in which the radiating element is composed of an untilted narrow-wall slot and a pair of shaped irises that flank the slot in the waveguide. An array with 16 proposed elements for X-band application is designed and measured. The experimental results show that the antenna has an excellent cross-polarization level of < -40 dB and over 7% bandwidth of VSWR ≤ 1.5.
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