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First derivative of frequency with respect to time is phase, so there are no analog wide bandwidth phase shifters, excepting for goniometers. Goniometers have an annoying amplitude variation with frequency, even in their capacitve form they are still tempermental. (Used to set the 3.579545 mhz carrier phase in RS-150 NTSC camera encoders and previously in WW2 radar sets.)

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If you are willing to create a matched pair of IF strips, with a +/- 45 degree difference at the IF freq, but with idetical phase matched RF front ends, it can work.

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But cost as the over all limit, digital is another matter and an SDRplay duo, which has the ability of 90 degree diversity reception might be the useful wide band answer.

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I would suspect that if you are willing to go "Non-Foster" then there is always an imaginary solution. . .

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The pun was intentional.? Get it? "i" or "j"? ?

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Jim/VEZ

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