Compact dual-band axially corrugated profiled horn for prime-focus reflector antenna

摘要

This paper reports a new compact dual-band axially corrugated profiled horn feed (DBCPH) for prime-focus reflector antenna at C-band (uplink and downlink frequency bands with bandwidth ratio of 1.6). DBPCH consists of one sinusoid profiled section and two internal axial corrugations (internal short-circuited ring slots), for obtaining a multimode horn feed. Such a blended structure is optimized over the specified frequency bands (3.68-3.70 and 5.865-5.915 GHz) to achieve various performance objectives (such as compactness, return loss, polarization purity, etc.). Measured and predicted results show that DBCPH provides better return loss >i8.6 dB, low cross-polarization (better than -32 dB), and adequate edge taper at +48° (8.5-11.7 dB) along with compact size (1.3X. aperture diameter and 0.88k length at lower frequency). The horn would be used as a feed element for front-fed prime-focus reflector for pencil beam spacecraft antenna application.