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Message: <blockquote data-quote="Channel Hopper" data-source="post: 648183" data-attributes="member: 175144">How do you know paxolin is not a dielectric ? , besides copper plate works very well at these frequencies, foil is not a great contenderThe copper parts on a veroboard (last used it in 1980) might be an ideal way of cutting the various tracks to give the best performance at one frequency( or a good performer at all). Use the single dotted 1mm stuff and cut out/replace as necessary.From the original Doktorofsat plan I can see a transform design that is very efficient at mid-frequency (3.7-3.8GHz), but not over the whole band.(Then again I was working on focal alignment with deflection coils at college, and getting disheartened,  finally submitting designs for some fixed polarity mechanical porting in the early nineties).</blockquote>