A novel H-plane waveguide intersection

This paper proposes a novel waveguide intersection separating two H-plane waveguide systems from one another. If a four-port network with four-fold rotational symmetry is completely matched, it has necessarily intersection properties. The proposed waveguide intersection composed of a square H-plane waveguide planar circuit connected four input/output waveguide ports in four-fold rotational symmetry, and metallic posts inserted at the junction without destroying the symmetry to realize a perfect matching. By optimizing the circuit parameters, high isolation properties are obtained in a relatively wide frequency band of about 8.6 % for return loss and isolation better than 20 and 30 dB, respectively, for a circuit designed at 10 GHz. The proposed waveguide intersection can be analyzed by H-plane planar circuit approach, and possesses advantages of compactness, simplicity, and high-power handling ability. The validity of the design concept is confirmed by em-simulations and experiments.