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November 28th 06, 07:14 PM
posted to rec.radio.amateur.antenna
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How to build a 45 degree hybrid?
Hello, John, and that link does not cover 0-90 degree (quadrature) hybrids which I'm guessing is what Bindy is after. A commercially-available broadband quadrature combiner/splitter is usually implemented using a 0-0 or 0-180 hybrid to which an all-pass network is added to achieve the desired phase difference out the output ports of the hybrid. Getting these devices to behave properly over a broad frequency range is somewhat of a black art and vendors such as Mini-Circuits and Merrimac keep these techniques to themselves. Sincerely, and 73s from N4GG0, John Wood (Code 5550) e-mail: Naval Research Laboratory 4555 Overlook Avenue, SW Washington, DC 20375-5337 Hello both Johns. and one Bindy. Here's how one person did it, and published in QEX November 1982. "How to design wide-band RF Quadrature Network". G.W. Horn, I4MK Bologna, Italy It's not elementary, but he (and VE5FP/VK2BOX) made successful ones that covered 3-30 MHz nicely. Horn gives the equations that must be satisfied to accomplish the task. If you have difficulty retrieving the article, the call book shows the call sign still active. Might drop him a line. W4ZCB |
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