Design of communication circulators using a triplet of U.E.'s at the junction of a circular plate

An attractive gyromagnetic resonator for the design of communication circulators is one for which the shape of the centre conductor between the top and bottom ferrite disks and ground plates incorporates a triplet of short metal strips or U.E.'s at the junction of a circular one. The complex gyrator circuit of one such geometry has recently been experimentally characterised in the literature. The introduction of U.E.'s in the resonator circuit provides a means of decoupling the coupling angle at the terminals of the circular plate from any external networks and a means of adjusting the susceptance slope parameter of the complex gyrator circuit of the junction. The study includes the practical design of one device at 2.0 GHz with a 23 dB return loss over a 30% bandwidth. © 2010 The Institution of Engineering and Technology.