| 摘要 |
In a millimeter waveband transceiver using an antenna and a waveguide for a connection line, it is necessary to perform transmission mode line conversion between TEM waves of a microstrip line and VTE01 mode waves of the waveguide. There is a limit to reducing the conversion loss using only a matching box for connecting the microstrip line with the waveguide. In a transmission mode line transducer for converting between the TEM waves of the microstrip line and the VTE01 mode waves of the waveguide, if the cross-sections are substantially the same size, in the case of a 50Omega microstrip line when the characteristic impedance of the waveguide is about 80%, i.e., 40Omega, the line conversion loss can be optimized. Therefore, the microstrip line is connected with the waveguide using a lambda/4 matching box via a ridged waveguide having a low impedance and a length of lambda/16 or less.
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