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Improved VHF quadrature hybrid coupler

In this paper the practical design of the VHF quadrature hybrid coupler is presented. Knowing, before the production, what are the conditions that coupler has to satisfy, has enabled us to acquire, through computer simulation, the dimensions of the coupler that was later produced. Values of the S-parameters of the simulated coupler are being compared, to values of the S-parameters of the produced coupler to validate the design process. Coupler is designed as a broadside-coupled suspended strip-line coupler, for frequency range from 150 MHz to 200 MHz, with central frequency at 175 MHz. It consists of two overlapping brass strips of equal widths, placed on the top and bottom surface of a Teflon substrate, which is sandwiched between the top and bottom of an aluminum casing and separated from them by air layers of equal thickness. Purpose of the coupler is to combine two input signals, ports 1 and 4, in quadrature, who each have 16 KW of power, in to an output signal, port 2 or 3, of 32 KW.