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A parabolic profile pyramidal horn antenna with flaring in both the E‐ and H‐plane is presented in this study. The proposed structure having aperture dimensions of 518.10 × 408.36 mm2 is designed and fabricated for S‐band (2.2–3.3 GHz). Due to increase in the flaring by 3.35° in the E‐plane and 3.18° in the H‐ plane compared to the optimal typical pyramidal horn antenna (TPHA), a half‐power beamwidth (HPBW) of less than 16.20° in both the planes with higher gain is achieved in the proposed antenna. The maximum phase centre (PC) variation, phase and amplitude variation of the electric field across the aperture in the proposed design are half compared to TPHA throughout the band, thus having good PC stability and lower phase error. The cross‐polarisation level and the measured return loss of <25 and 15 dB, respectively, is achieved throughout the band, thus providing a good impedance matching and single dominant mode of propagation, i.e. TE10. With the lower HPBW and higher gain, the proposed antenna can be used in applications where point directive beam is required such as wireless power transfer to charge sensors and batteries of quad‐copter and so on.

This paper presents an aperture matched parabolic pyramid horn antenna (APPHA) having flaring in the E‐ and H‐ plane. The proposed structure is designed and manufactured for S‐band (2.2–3.3 GHz) with a semicircular aperture matched section in both planes. The APPHA gives half power beam width (HPBW) less than 17° and 15° in the E‐ and H‐ planes, respectively due to the parabolic profile and aperture match section. An average improvement in front to back ratio and gain is 18.53 dB and 1.45 dBi, respectively compared to the conventional pyramidal horn antenna. The maximum variation in the phase center is also 2.8 cm. The measured return loss and cross‐polarization of less than 12 and 20 dB, respectively, is seen throughout the band, thus providing a good impedance matching. The proposed antenna having higher gain and lower HPBW can be used for wireless power transfer applications due to point directive beam to charge the batteries of quad‐copter, sensors as well as being a good candidate for parabolic dish reflector feed.

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