Broadband absorptive-loading filter
First Claim
1. Front end circuitry for an electronic appliance, the front end circuitry comprising:
- a first port configured to conduct signals from a signal source, the signals comprising a first signal and a second signal;
a first filter coupled to the first port, the first filter configured to filter the first signal according to a first frequency band and output the filtered first signal for further processing, the first filter comprising one of a low pass filter or a high pass filter;
a second filter coupled to the first port and arranged in parallel with the first filter, the second filter configured to absorb the second signal according to a second frequency band that is a stopband for the first filter; and
an impedance load coupled between an output of the second filter and ground.
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Abstract
In one embodiment, front end circuitry for an electronic appliance, the front end circuitry comprising: a first port configured to conduct signals from a signal source, the signals comprising a first signal and a second signal; a first filter coupled to the first port, the first filter configured to filter the first signal according to a first frequency band and output the filtered first signal for further processing; a second filter coupled to the first port and arranged in parallel with the first filter, the second filter configured to absorb the second signal according to a second frequency band that is a stopband for the first filter; and an impedance load coupled between an output of the second filter and ground.
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Citations
20 Claims
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1. Front end circuitry for an electronic appliance, the front end circuitry comprising:
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a first port configured to conduct signals from a signal source, the signals comprising a first signal and a second signal; a first filter coupled to the first port, the first filter configured to filter the first signal according to a first frequency band and output the filtered first signal for further processing, the first filter comprising one of a low pass filter or a high pass filter; a second filter coupled to the first port and arranged in parallel with the first filter, the second filter configured to absorb the second signal according to a second frequency band that is a stopband for the first filter; and an impedance load coupled between an output of the second filter and ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electronic appliance, comprising:
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front end circuitry comprising; a first port configured to conduct signals from a signal source, the signals comprising a first signal and a second signal; a first filter coupled to the first port, the first filter configured to filter the first signal according to a first frequency band and output the filtered first signal for further processing; a second filter coupled to the first port and arranged in parallel with the first filter, the second filter configured to absorb the second signal according to a second frequency band that is a stopband for the first filter; and an impedance load coupled between an output of the second filter and ground, the impedance load comprising an impedance value that matches an impedance value of the signal source. - View Dependent Claims (14, 15, 16, 17)
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18. A broadband absorptive-loading filter method, the method comprising:
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receiving at a first port signals from a signal source, the signals comprising a first signal and a second signal; filtering by a first filter the first signal according to a first frequency band and outputting the filtered first signal for further processing, the first filter coupled to the first port; absorbing by a second filter the second signal according to a second frequency band that is a stopband for the first filter, the second filter coupled to the first port and arranged in parallel with the first filter, the second filter coupled to a grounded impedance load; causing by a combination of the first filter and the second filter a filter return loss of a substantially constant value across the first frequency band and the second frequency band; and imposing by the first filter a band filter loss that is substantially the same as a band filter loss imposed by the combination of the second filter and the first filter.
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19. Front end circuitry for an electronic appliance, the front end circuitry comprising:
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a first port configured to conduct signals from a signal source, the signals comprising a first signal and a second signal; a first filter coupled to the first port, the first filter configured to filter the first signal according to a first frequency band and output the filtered first signal for further processing; a second filter coupled to the first port and arranged in parallel with the first filter, the second filter configured to absorb the second signal according to a second frequency band that is a stopband for the first filter; and an impedance load coupled between an output of the second filter and ground; wherein the combination of the first filter and the second filter is configured to cause a filter return loss of a substantially constant value across the first frequency band and the second frequency band.
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20. Front end circuitry for an electronic appliance, the front end circuitry comprising:
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a first port configured to conduct signals from a signal source, the signals comprising a first signal and a second signal; a first filter coupled to the first port, the first filter configured to filter the first signal according to a first frequency band and output the filtered first signal for further processing; a second filter coupled to the first port and arranged in parallel with the first filter, the second filter configured to absorb the second signal according to a second frequency band that is a stopband for the first filter; and an impedance load coupled between an output of the second filter and ground; wherein the first filter is configured to impose a band filter loss across a passband that is substantially unaffected by the combination of the second filter and the first filter.
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Specification