Claims
- 1. In a wide band notch filter of the type used to remove cable television frequencies in a pass band above 55 MHz and comprising an input, an output, a network in series with said input and output, said network comprising inductive and capacitive elements operatively coupled to each other, and resonant circuit means formed by a capacitor and inductor in parallel with each other and coupled between said network and ground, the improvement comprising inductive means between said resonant circuit means and ground, the value of said inductive means being such that the high frequency equivalent circuit of said filter resembles an all pass filter and extends said pass band of said filter to at least 600 MHz.
- 2. A wide band notch filter according to claim 1 wherein the value of said inductive means is such that the high frequency equivalent of said filter resembles a type III all pass filter.
Parent Case Info
This is a continuation of application Ser. No. 07/206,527 which was filed on Jun. 14, 1988, and is now abandoned.
US Referenced Citations (2)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2425674 |
Dec 1975 |
DEX |
0015044 |
May 1972 |
JPX |
0161515 |
Sep 1983 |
JPX |
0206914 |
Sep 1987 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
206527 |
Jun 1988 |
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