Patent ID: 6756936
Filing Date: 2004-06-29
Classification: G01S,H01L,H01Q,H05K

Abstract:
A high frequency microwave transceiver for use in a motion detector, comprising:(a) a multilayer microwave circuit board; (b) said multilayer microwave circuit board comprising an oscillator/mixer card, an antenna card, and a ground plane layer between said oscillator/mixer card and said antenna card; (c) said multilayer microwave circuit board comprising microstrip circuitry adapted for operation at a frequency within the range from approximately 16 GHz to approximately 90 GHz; (d) said oscillator/mixer card comprising an oscillator circuit: (e) said oscillator circuit comprising a surface mounted transistor chip wired bonded in said oscillator circuit; (f) wherein said oscillator circuit does not include a dielectric resonator; (g) said oscillator/mixer card comprising a mixer circuit; (h) said mixer circuit comprising a surface mounted diode chip wire bonded in said mixer circuit; (i) said antenna card comprising a transmit antenna and a receive antenna; (j) each antenna having a respective microstrip that substantially overlies an associated microstrip on the oscillator/mixer card; (k) said ground plane layer having, for each antenna, a respective slot to provide coupling between the antenna microstrip and the associated microstrip on the oscillator/mixer card.