Input stage for a police radar detector

Details Input stage for a police radar detector Input stage for a police radar detector

1997-09-12

1999-01-05

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Radar ew

Detection of surveilance

342175, 455334, G01S 740

Patent

active

058568018

ABSTRACT:
An input stage of a police radar detector is configured so that a near end of a mixer is coupled to an antenna for receiving high frequency signals and a far end of the mixer is coupled to the antenna for receiving low frequency signals. A local oscillator and an intermediate frequency amplifier are also coupled to the far end of the mixer. The low frequency signals, X band police radar signals, are coupled to the far end of the mixer through a band rejection filter, which serves as a diplexer, a preamplifier and a first bandpass filter. The local oscillator is coupled to the far end of the mixer through a second bandpass filter and the far end of the mixer is coupled to the intermediate frequency amplifier through a low pass filter. The high frequency signals, K band and K.sub.a band signals, are coupled to the near end of the mixer from the antenna through a high pass filter. The diplexer in combination with the first and second bandpass filters, the low pass filter and the high pass filter passively multiplex the related signals within the input stage of the police radar detector.

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