© The Institution of Electrical Engineers
Geometry of the −3 dB, 50Ω Lange coupler is presented as a continuous function of dielectric constant, between ɛr=2 and 12. Corresponding even- and odd-mode phase velocities are also given, allowing the length of coupled section to be calculated.
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Bryant, T.G., Weiss, J.A.: `Normal mode impedance of a coupled pair of microstrip transmission lines', G-MTT international microwave symposium digest, May 1968, p. 117–122.
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