Wave transmission lines and networks – Automatically controlled systems – Impedance matching
Patent
1984-05-30
1986-02-25
LaRoche, Eugene R.
Wave transmission lines and networks
Automatically controlled systems
Impedance matching
333187, 333188, 310343, 330110, 330294, H03G 1104, H03H 900
Patent
active
045730270
ABSTRACT:
This invention is directed to a narrow band filter for eliminating out-of-band noise in the oscillator signal of a doppler radar system. It provides a very high Q filter derived from a Bulk Acoustic Resonator's (BAR) high Q, L-Band response and uses thermal feedback to lock the BAR's response band onto the input frequency. The BAR is a very narrow band filter with a Q near 40,000 and a comblike frequency response having passbands occurring every 5 MHz, approximately. The comblike response of the BAR shifts down 60 KHz for every 1.degree. C. rise in temperature. In this invention a frequency sensitive heater is used to move the response comb of the BAR up or down in accordance with changes in the frequency of the incoming signal. The input frequency can be allowed to drift and the heat source will produce more heat or less heat, keeping the response right at the input frequency.
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Buchalter Michael S.
Haynes James T.
Hopwood Francis W.
LaRoche Eugene R.
Lee Benny T.
Matthews Willard R.
Singer Donald J.
The United States of America as represented by the Secretary of
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