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Abstract
A wideband compact antenna that can be flush mounted on a platform for high-power broadside transmitting applications is introduced. The proposed design comprises a transvers electromagnetic (TEM) horn embedded in a shaped rectangular cavity. The detrimental interaction with the lossless cavity is mitigated by properly integrating the TEM horn inside the cavity. This approach allows the antenna to radiate as an aperture antenna at low frequencies while maintaining good radiation features from the TEM horn at higher frequencies. Elliptically shaped ridges are also added inside the cavity to improve gain and the quality of radiation patterns at the high-frequency end. The proposed antenna has electrical size of ∼0.28 $\lambda $ × 0.54 $\lambda $ × 0.3 $\lambda $ (length × width × depth) at the turn-on frequency and has VSWR 5 dBi, and good radiation patterns with low cross polarization from 2 to 7 GHz.
Published Version
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