Compact and Highly Efficient Single and Dual Polarized Aperture Antennas with Integrated Multiport Overmoded Excitation

• Published in: 2021 15th European Conference on Antennas and Propagation (EuCAP) pp. 1 - 5
• Main Authors: Stoumpos, C., Fraysse, J.-P., Goussetis, G., Sauleau, R., Gonzalez, C. G., Legay, H.
• Format: Conference Proceeding
• Language: English
• Published: EurAAP 22-03-2021
• Subjects: Antenna feeds; Antenna measurements; aperture efficiency; Bandwidth; dual-polarization; excitation network; Horn antennas; multiport antenna; orthomode transducer; Prototypes; satellite feed; Surface waves; Three-dimensional printing
• DOI: 10.23919/EuCAP51087.2021.9411363

This paper presents a new type of radiating horn-like radiating element which exploits a two- or four-port integrated overmoded power division depending on the aperture type and the requirement for single- or dual-polarization. The general concept is illustrated by two design examples which are proposed in this paper at Ku-Tx band (10.7 - 12.75 GHz); a single-polarized two-access rectangular aperture pyramidal horn and a dual-polarized four-access square aperture horn feed antenna. The generic operational principles call for a power divider which feeds two or four suitably flared waveguide sections which are further connected to a bi- or quad-furcated surface discontinuity for the combination of the incoming fields. Finally, a common waveguide region on top completes the total topology. This type of radiating elements exhibits a compact profile, while at the same time achieves high aperture efficiency (over 90%) due to robust materialization of the desired aperture modal content over a bandwidth of 20%.