Patent ID: 6538530
Filing Date: 2003-03-25
Classification: H01P

Abstract:
A millimeter-wave transmitting/receiving apparatus comprising:(a) a voltage-controlled oscillating portion comprising: a high-frequency diode for outputting high-frequency signals of millimeter-wave band, and a variable capacitance diode placed so that a bias voltage applying direction coincides with an electric field direction of the high-frequency signals, for outputting the high-frequency signals as frequency-modulated transmission millimeter-wave signals by periodically controlling bias voltage, the voltage-controlled oscillating portion being installed at an end of a first dielectric strip; (b) a second dielectric strip which is joined, along an arc having a radius of curvature r not less than the wavelength &lgr; of the transmission millimeter-wave signals, to a straight portion of the first dielectric strip on the downstream side from the voltage-controlled oscillating portion in the direction for transmitting the transmission millimeter-wave signals of the first dielectric strip; (c) a circulator which has an input end, an input/output end and an output end, the circulator being connected to the other end of the first dielectric strip at the input end, for outputting transmission millimeter-wave signals inputted into the input end to the input/output end, and outputting reception signals inputted into the input/output end to the output end; (d) a third dielectric strip, one end of which is connected to the input/output end of the circulator, and on the other end side of which is disposed a transmission/reception antenna; (e) a fourth dielectric strip, one end of which is connected to the output end of the circulator; (f) a mixer for connecting the second dielectric strip and the fourth dielectric strip to mix respective signals transmitted to the second and fourth dielectric strips to generate intermediate frequency signals; and (g) a pair of conductor plates which are placed in parallel at a spacing equal to or less than one half of the wavelength &lgr; of the millimeter-wave signals, in which spacing are disposed the first to fourth dielectric strips, the voltage-controlled oscillating portion, the circulator and the mixer.