Millimeter-Wave Microstrip Line to Waveguide Transition Fabricated on a Single Layer Dielectric Substrate
نویسندگان
چکیده
The millimeter-wave front-end module for an automotive radar sensor is generally composed of an antenna placed on the front surface of the sensor head and a millimeter-wave circuit inside it. As the antenna for the radar sensor, several types of antennas, a slotted waveguide antenna, a triplate antenna, a dielectric lens antenna, a dielectric leaky wave antenna and a microstrip antenna, have been studied. The microstrip antenna is still a candidate in order to realize low cost and low profile millimeter-wave front-end module for the radar sensor. The microstrip antenna is usually connected to the millimeter-wave circuit through a waveguide. Thus a microstrip line to waveguide transition is required to connect them. Since high SNR (Signal to Noise Ratio) for automotive radar is required to detect a target at a long distance of 150 m, not only the millimeterwave components but also the transitions used to connect them are desired to be low loss. In addition, 13
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