FILTERING DEVICE AND A METHOD FOR FILTERING A SIGNAL
First Claim
1. A filtering device comprising:
- a first filtering element having a first filtering characteristic with at least a first pass band and at least a first stop band;
a complementary filtering unit with a complementary filtering characteristic comprising at least one complementary pass band and at least one complementary stop band;
a transforming unit adapted to substantially transform at least the first filtering characteristic of the first filtering element into an effective filtering characteristic,wherein the effective filtering characteristic and the complementary filtering characteristicare closely spaced in frequency, andcombine to provide an overall filtering characteristic of the filtering device.
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Abstract
The present disclosure teaches a filtering device. The filtering device comprises a transforming unit, at least a first filtering element and a complementary filtering unit. The filtering device of the present disclosure allows an isolation of radio signals within a selected frequency band. Frequency bands closely-spaced to the selected frequency band may be suppressed. The present disclosure provides a reliable and almost identical response to temperature changes for the pass band within the selected frequency band and the stop bands closely-spaced to the selected frequency band. The filtering device withstands temperature changes without affecting a filtering performance different to the prior art. The present disclosure further provides a method for filtering an input signal as well as a computer program product for the manufacture of the filtering device and a computer program product for the carrying out of the method of filtering.
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Citations
31 Claims
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1. A filtering device comprising:
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a first filtering element having a first filtering characteristic with at least a first pass band and at least a first stop band; a complementary filtering unit with a complementary filtering characteristic comprising at least one complementary pass band and at least one complementary stop band; a transforming unit adapted to substantially transform at least the first filtering characteristic of the first filtering element into an effective filtering characteristic, wherein the effective filtering characteristic and the complementary filtering characteristic are closely spaced in frequency, and combine to provide an overall filtering characteristic of the filtering device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for filtering an input signal, the method comprising:
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providing an input signal; filtering the input signal according to a complementary filtering characteristic, the complementary filtering characteristic comprising at least one complementary pass band and at least one complementary stop band; substantially transforming a first filtering characteristic with at least a first pass band and at least a first stop band into an effective filtering characteristic; wherein the effective filtering characteristic and the complementary filtering characteristic are closely spaced in frequency, and combine to provide an overall filtering characteristic. - View Dependent Claims (26, 27, 28, 29)
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30. A computer program product embodied on a computer readable medium and the computer-readable medium comprising executable instructions for the execution of a manufacture of a filtering device, the filtering device comprising:
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a first filtering element having a first filtering characteristic with at least a first pass band and at least a first stop band; a complementary filtering unit with a complementary filtering characteristic comprising at least one complementary pass band and at least one complementary stop band; a transforming unit is adapted to substantially transform at least the first filtering characteristic of the first filtering element into an effective filtering characteristic; wherein the effective filtering characteristic and the complementary filtering characteristic are closely spaced in frequency and combine to provide an overall filtering characteristic of the filtering device; and wherein the overall filtering characteristic affects an output signal at an output of the filtering device in response to an input signal at an input of the filtering device.
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31. A computer program product embodied on a computer readable medium and the computer-readable medium comprising executable instructions for the execution of a method for filtering an input signal, the method comprising the steps of:
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providing an input signal; filtering the input signal according to a complementary filtering characteristic, the complementary filtering characteristic comprising at least one complementary pass band and at least one complementary stop band; substantially transforming a first filtering characteristic with at least a first pass band and at least a first stop band into an overall filtering characteristic; wherein the effective filtering characteristic and the complementary filtering characteristic are closely spaced in frequency and combine to provide an overall filtering characteristic.
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Specification