Circumplexer: a Novel Dual-Band Dual-Circular Polarization Antenna Feeding Network for Satellite Communications

In this paper, Anteral presents a novel dual-band dual-circular polarization antenna feeding network for satellite communications. Circumplexer is the idea of Anteral for compactness of an antenna feeding network by integrating a septum in the common port of a diplexer. Therefore, the new device provides dual circular polarization with excellent axial ratio levels and very high isolation between channels simultaneously. Two different waveguide filters are utilized to provide very high isolation between two different channels while a septum in the common port is used to provide with the dual circular polarization. This kind of components is presented for the first time in the literature. The proposed design example accomplishes measured results with more than 23 dB return loss, 70 dB isolation between channels with an axial ratio better than 0.45 dB. Due to its compact design, it is especially attractive for satellite communications where size and weight are key parameters. We have called this component circumplexer since it is really the junction of circular polarization inside a diplexer.