Abstract
Due to the wide bandwidth of 5G systems, multiple antennas are usually required to cover the entire frequency band in practical applications. Finding a single antenna structure that covers the 5G communication band has been the focus of the 5G application. This paper proposes a combined structure consisting of an axially corrugated horn antenna and orthomode transducer (OMT), which can cover the frequency range of the 5G communication system-24-50GHz. The OMT is used for mode separation, and its common port uses the circular quad-ridge waveguide structure to achieve UWB and high port isolation. The horn structure is an axially corrugated aperture design horn with a circular quad-ridge waveguide port, which has the exact dimensions of the common port of the OMT structure. The quad-ridge of the antenna port can increase the operating bandwidth and reduce cross-polarized radiation at high frequencies. The axially corrugated structure can stabilize the gain curve. The operating band of the axially corrugated horn antenna structure can cover 24-50GHz. The axially corrugated horn antenna has stable pattern characteristics and low cross-polarization isolation in the entire frequency band. The measurement results of VSWR are 1.8 Typ., the gain is 10dB Typ. and the cross-polarization isolation is -35dB Typ. Because of its good performance and reduced size, the proposed antenna can be used as a feed antenna in the compact antenna test range (CATR). This axially corrugated feed horn antenna makes up for the shortcomings of the existing horn antenna in the 5G measurement system. It proposes a new choice for the 5G measurement system.
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