IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0251558
(2005-10-14)
|
등록번호 |
US-7388537
(2008-06-17)
|
발명자
/ 주소 |
- Martinson,Glen D.
- Burin,Marian Mark
- Lisowski,Feliks K.
|
출원인 / 주소 |
|
대리인 / 주소 |
Wood, Herron & Evans, LLP
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
14 |
초록
▼
A radar detector includes features to reduce emissions such as those typically generated by the detector's local oscillator. Two low noise amplifiers (LNA's), operating in X band and a combined K/Ka band, respectively amplify X and K/Ka band signals from separate antennae, and deliver those signals
A radar detector includes features to reduce emissions such as those typically generated by the detector's local oscillator. Two low noise amplifiers (LNA's), operating in X band and a combined K/Ka band, respectively amplify X and K/Ka band signals from separate antennae, and deliver those signals over separate, elongated and narrow signal paths to X and K/Ka mixers, where those signals are mixed with local oscillator (LO) signals to produce IF for detection. The elongated, narrow signal paths from the antennae to the mixers reduce LO emissions, and those emissions are further reduced by incorporating radar absorbers between the circuit board and detector case along the antenna-mixer path, including radar absorptive paint on the circuit board itself along this path, and sealing the case with a conductive sealing gasket.
대표청구항
▼
What is claimed is: 1. A detector for detecting radar signals in a police radar band, comprising: a first antenna receiving radar signals in a police radar band, a first low noise amplifier amplifying radar signals received from said first antenna and delivering an amplified radar signal for mixing
What is claimed is: 1. A detector for detecting radar signals in a police radar band, comprising: a first antenna receiving radar signals in a police radar band, a first low noise amplifier amplifying radar signals received from said first antenna and delivering an amplified radar signal for mixing, a second antenna receiving radar signals in a police radar band, a second low noise amplifier amplifying radar signals received from said second antenna and delivering an amplified radar signal for mixing, a first local oscillator, a first mixer mixing a signal from said local oscillator with an amplified radar signal from one of said low noise amplifiers to downmix said amplified radar signal to an intermediate frequency, and an intermediate frequency police signal detector receiving a downmixed signal for police activity detection. 2. The detector of claim 1 wherein said first mixer mixes a signal from said first local oscillator with an amplified signal from said first low noise amplifier, and further comprising a second local oscillator and a second mixer, the second mixer mixing a signal from said second local oscillator with an amplified radar signal from said second low noise amplifier to downmixed said amplified radar signal to said intermediate frequency. 3. The detector of claim 2 wherein said first antenna, first low noise amplifier and first mixer receive radar signals in the X band and said second antenna, second low noise amplifier and second mixer receive radar signals in the K and Ka bands. 4. A detector for detecting radar signals in a police radar band, comprising: a first low noise amplifier amplifying radar signals in a first radar band, a first local oscillator, a first mixer mixing a signal from said local oscillator with an amplified radar signal from said first low noise amplifier to downmix an amplified radar signal from said first low noise amplifier to an intermediate frequency, a second local oscillator, a second mixer mixing a signal from said local oscillator with a received radar signal in a second radar band to downmix said received radar signal in said second band to said intermediate frequency, and an intermediate frequency police signal detector receiving a downmixed signal for police activity detection. 5. The detector of claim 4 further comprising a second low noise amplifier for amplifying radar signals in said second radar band, and delivering said amplified radar signals in said second band to said second mixer, wherein said first low noise amplifier and second low noise amplifier receive radar signals from a common antenna. 6. The detector of claim 5 wherein said first low noise amplifier and first mixer receive radar signals in the X band and said second low noise amplifier and second mixer receive radar signals in the K and Ka bands. 7. A detector for detecting radar signals in a police radar band, comprising: a low noise amplifier amplifying radar signals in a first and a second police radar band, and delivering an amplified radar signal for mixing, a local oscillator, a mixer mixing a signal from said local oscillator with an amplified radar signal from said low noise amplifier to downmix said amplified radar signal to an intermediate frequency, and an intermediate frequency police signal detector receiving a downmixed signal for police activity detection. 8. The detector of claim 7 wherein said first and second police radar bands are the K and Ka bands. 9. A detector for detecting radar signals in a police radar band, comprising: an antenna receiving radar signals in a police radar band, said antenna located at a first end of a signal path, a local oscillator, a mixer mixing a signal from said local oscillator with an amplified radar signal from said low noise amplifier received at a second end of said signal path, to downmix said amplified radar signal to an intermediate frequency, and an intermediate frequency police signal detector receiving a downmixed signal for police activity detection, wherein said signal path is longer than half of the wavelength of radar signals in said police radar band. 10. The detector of claim 9 further comprising a low noise amplifier located at said first end of said signal path, amplifying radar signals in said police radar band received from said antenna and delivering amplified radar signals to said first end of said signal path. 11. The detector of claim 9 further comprising a radar absorber positioned along said signal path. 12. The detector of claim 11 further comprising a housing and a circuit board housed therein, wherein said signal path is a trace on said circuit board and said radar absorber is a filler positioned between said circuit board and said housing along said trace. 13. The detector of claim 11 wherein said signal path is a trace on said circuit board and said radar absorber is a radio absorbing layer on said circuit board. 14. The detector of claim 13 wherein said radio absorbing layer on said circuit board is a layer of radar absorbing paint. 15. A detector for detecting radar signals in a police radar band, comprising: an antenna receiving radar signals, a housing, a circuit board mounted within said housing and including detecting circuitry detecting police radar signals received by said antenna and also including a local oscillator generating radio frequency signals and a mixer mixing said local oscillator signals with radar signals from said antenna, and a radar absorber positioned within said housing between said local oscillator and said antenna and away from said local oscillator, to absorb at least a portion of said radio frequency signals that would otherwise be emitted from said antenna. 16. The detector of claim 15 wherein said circuit board includes a trace forming a signal path for signal to be transferred from said antenna to said detecting circuitry, and said radar absorber is a filler positioned between said circuit board and said housing along said trace. 17. The detector of claim 15 wherein said radar absorber is a radio absorbing layer on said circuit board. 18. The detector of claim 17 wherein said radio absorbing layer on said circuit board is a layer of radar absorbing paint. 19. The detector of claim 17 wherein said circuit board includes a trace forming a signal path for signal to be transferred from said antenna to said detecting circuitry, and said radio absorbing layer is positioned along said trace. 20. A detector for detecting radar signals in a police radar band, comprising: an antenna receiving radar signals, a housing having a first and a second part, a circuit board mounted within said housing and including detecting circuitry detecting police radar signals received by said antenna and also generating radio frequency signals, and a conductive gasket positioned between said first and second parts to reduce the emission outside of said housing of radio frequency signals generated by said detection circuitry. 21. The detector of claim 20 wherein said conductive gasket substantially surrounds said detection circuitry.
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