Filter system for amplifier station for amplifying signals in separate frequency bands
阅读：255发布：2022-01-02
专利汇可以提供Filter system for amplifier station for amplifying signals in separate frequency bands专利检索，专利查询，专利分析的服务。并且A filter system for a communications system such as a bidirectional CATV system is shown. The filter system includes diplex filters having a substantially constant input impedance and a band stop filter to suppress signals at the cross-over frequency of the diplex filters.，下面是Filter system for amplifier station for amplifying signals in separate frequency bands专利的具体信息内容。
1. In an amplifier station for a communication system wherein signals are carried over a transmission medium in first and second bands of frequencies, said amplifier station having first and second ports, a filter system comprising: first and second diplex filters connected to said first and second ports, respectively, each of said diplex filters having a high pass filter and a low pass filter for passing the signals in a respective one of said bands of frequencies and further having a substantially constant impedance matched to the impedance of said transmission medium, said high pass and low pass filters having frequency responses that cross at the 3 db points; and first and second amplifier channels connected between said high pass filters and said low pass filters, respectively, each for amplifying said signals in a respective one of said first and second bands of frequencies, one of said first and second amplifier channels including first and second amplifiers and a band stop filter having a band stop frequency response connected therebetween for attenuating signals at the crossover frequency of the high pass and low pass filters of each of said diplex filters.
2. A filter system as defined in claim 1 wherein said signals in said first and second bands of frequencies are carried over said transmission medium in opposite directions.
3. A filter system as defined in claim 1 wherein said band stop filter is a Butterworth filter.
4. In an amplifier station for a community antenna television system wherein signals are carried on a coaxial cable in a first band of frequencies which includes VHF television signals and in a second band of frequencies lower in frequency than said first band of frequencies, said amplifier station having first and second ports adapted to be connected to coaxial cable segments, a filter system comprising: first and second diplex filters connected to said first and second ports, respectively, each of said diplex filters having a high pass filter and a low pass filter for passing the signals in a respective one of said bands of frequencies wherein the impedance of each of said diplex filters is substantially constant and matched to the impedance of the coaxial cable over a frequency range including said first and second bands of frequencies and the guard band therebetween; and first and second amplifier channels connected between said high pass filters and said low pass filters, respectively, each for amplifying said signals in a respective one of said first and second bands of frequencies, one of said first and second amplifier channels including first and second amplifiers and a band stop filter having a band stop frequency response connected therebetween for attenuating signals at the cross-over frequency of each of said diplex filters.
5. A filter system as defined in claim 4 wherein said signals in said first and second bands of frequencies are transmitted in opposite directions.
6. A filter system as defined in claim 4 wherein said band stop filter is a Butterworth filter.
7. A filter system as defined in claim 4 wherein said band stop filter is connected in said second amplifier channel for amplifying signals in said second band of frequencies.
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