Planar Feeding Circuit Integrated With a Compact Dielectric Resonator for Polarization Diversity

Maksim V. Kuznetcov, Symon Podilchak, Jonathan C. Johnstone, Michel Clénet, Yahia M. M. Antar

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A compact two-port feeding circuit that supports a dielectric resonator (DR) element is presented for applications requiring polarization diversity. The L-band structure consists of a cylindrical DR that can generate right-handed circular polarization (RHCP), left-handed circular polarization (LHCP), and linearly polarized radiation. The DR dimensions have been optimized considering a relative dielectric constant of εr = 27, and the entire structure (the circuit and DR) has dimensions of 9 cm x 9 cm x 2 cm (or about 0.3 λ₀ x 0.3 λ₀ x 0.07 λ₀ at the lower operational frequency range). Radiation by the DR originates from four orthogonal HE11δ modes that are excited by four radial slots etched out of the ground plane (all underneath the DR) printed on top of an FR-4 substrate. Each of these four slots is unconventionally driven by two 50-Ω microstrip lines, and all four radial slots conform to the shape of the top cylindrical DR element. Polarization diversity is achieved with this DR and circuit system (DRCS) arrangement, mainly by the design of its fully integrated and planar circuit, which routes power to the eight microstrip lines for DR excitation. This FR-4 printed circuit board (PCB) feeding system consists of two meandered Wilkinson power dividers, two 180° delay lines, and four surface mount 90° hybrid couplers. The complete DRCS is compact in size, is broadband (more than 40%), and offers the advantage of requiring only two external ports, one for LHCP the other for RHCP, while an external phase shifter and a combiner are needed for linearly polarized radiation.
Original languageEnglish
Pages (from-to) 1 - 1
JournalIEEE Transactions on Microwave Theory and Techniques
Early online date18 Mar 2021
Publication statusE-pub ahead of print - 18 Mar 2021


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