The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2003
Filed:
Aug. 15, 2001
Masayuki Kanechika, Zama, JP;
Fumio Kubo, Yokohama, JP;
Stanley Electric Co., Ltd., Tokyo, JP;
Abstract
A compact millimeter wave radar transceiver at low cost is provided wherein a direct current voltage applying circuit is coupled to a high frequency line to apply a fast pulse wave without losing a sharp input pulse pattern. A voltage is applied to a negative resistance diode, such as a Gunn diode, which is variably controlled to vary the diode oscillating frequency signal, which signal is outputted as a transmitting wave. The transmitted wave is reflected by a target and received by the negative resistance diode. The received wave is detected as a heterodyne detection utilizing a non-linear property of the negative resistance diode. A frequency difference between the transmitted wave and the received reflected wave is outputted via a low-pass filter and processed to detect the target. To keep the sharp pulse wave pattern for applying to the high frequency line, a Y-shaped power distributor, “Wilkinson divider”, consisting of &lgr;/4 (&lgr; designates wave length) line elements Z , Z and Z , is between a capacitor connected to a high frequency input/output terminal and a direct current voltage input terminal to provide a leakage power suppressing effect between the latter terminals.