Doppler radar speed measuring unit
US6091355A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1998 |
| Grant date | Jul 18, 2000 |
| Priority date | — |
| Expiry date | Jul 21, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/065
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A Doppler radar speed measuring module, that is self-contained and handheld, is fabricated on a multilayer PCB (printed circuit board) containing at least one antenna array and electronic circuitry. In one embodiment the antenna array is located on a top side and electronic circuitry is located on a bottom side opposite the antenna, with a ground plane layer sandwiched between the antenna array and the circuitry. The electronic circuitry includes a dielectric resonator stabilized oscillator, a microwave amplifier, a microwave mixer, a microwave coupler, voltage regulators, mechanical switches, and a display to indicate the measured speed of a moving target. The oscillator generates a very stable microwave signal which is split with part of the signal fed to a mixer and part fed to a transmit antenna. In one embodiment plated through vias electrically connect the two sides together. A transmitted signal reflects off of a moving target and is received by a receive antenna. The receive signal is electrically conducted from the receive antenna to the opposite side by plated through vias and is mixed with the oscillator signal to produce a low frequency Doppler beat signal. The Doppler …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.