Abstract
The T-Coupler or the magic tee (or magic T or hybrid tee) is a hybrid or 3 dB coupler used in microwave systems. It is an alternative to the rat-race coupler. In contrast to the rat-race, the three-dimensional structure of the magic tee makes it less readily constructed in planar technologies such as micro strip or strip line. The magic tee was originally developed in World War II, and first published by W. A. Tyrell of Bell Labs in a 1947 IRE paper. Robert L. Kyhl and Bob Dicke independently created magic tees around the same time. This paper illustrates simple and double ridge waveguide T-coupler. The relationships between the scattering variables in this sort of network are fixed by the unitary condition. Such a network has the properties that it is a matched device with one adjacent port decoupled from any incident port. The object of this paper is to present some results of simulation on the coupling and directivity of double ridge cross-waveguide couplers in a field ridge waveguide. This results are obtain by Ansoft HFSS using the Finite Element Method (FEM) calculations and the Genetic Algorithms method, and which show good performance.
Highlights
The simple and the double ridge waveguide T-coupler is 4 ports, 180 degree hybrid splitter, realized in field waveguide
Like all of the coupler and splitter structures, the simple and the double ridge waveguide T-coupler can be used as a power combiner, or a divider
The magic tee is a combination of E and H plane tees
Summary
The simple and the double ridge waveguide T-coupler is 4 ports, 180 degree hybrid splitter, realized in field waveguide. Like all of the coupler and splitter structures, the simple and the double ridge waveguide T-coupler can be used as a power combiner, or a divider. It is ideally lossless, so that all power into one port can be assumed to exit the remaining ports. The ridge waveguide T-coupler or the magic tee must incorporate an internal matching structure. The main idea behind the simple and the double ridge waveguide T-coupler is to combine a TE and a TM waveguide splitter In this particular case port 2 and port 3 are de-coupled, so one can expect S23 and S32 to have very low values. Viewing the electric fields gives a better understanding how the «Simple and Double Ridge Waveguide T-Coupler» works [1, 2]
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