Multiband Filter
First Claim
Patent Images
1. A band-stop filter comprising:
- a multilayered substrate having integrated structured metallization planes;
an input port and an output port;
first and second filter branches coupled in parallel between the input port and the output port;
a first subfilter arranged in the first filter branch, the first subfilter comprising a bandpass filter for a first passband;
a second subfilter arranged in the second filter branch, the second subfilter comprising a high-pass filter having a second passband, the second passband being established above the first passband, wherein the bandpass filter and the high-pass filter are constructed from inductor and capacitor elements that are at least partly integrated in the multilayered substrate;
a transverse branch connected to ground in the first filter branch; and
a resonator arranged in the transverse branch.
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Abstract
A band-stop filter is proposed which is constructed on a multilayered substrate and consists of a parallel circuit comprising a bandpass filter and a high-pass filter. The two filters are at least partly realized in the form of LC-elements integrated into the substrate. Further circuit components can be arranged as discrete components on the substrate. In the filter branch having the bandpass filter, an electroacoustic resonator is arranged in a transverse branch to ground. By means of the filter, a wide stop band is obtained, while the passband or passbands can comprise a plurality of radio bands.
44 Citations
20 Claims
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1. A band-stop filter comprising:
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a multilayered substrate having integrated structured metallization planes; an input port and an output port; first and second filter branches coupled in parallel between the input port and the output port; a first subfilter arranged in the first filter branch, the first subfilter comprising a bandpass filter for a first passband; a second subfilter arranged in the second filter branch, the second subfilter comprising a high-pass filter having a second passband, the second passband being established above the first passband, wherein the bandpass filter and the high-pass filter are constructed from inductor and capacitor elements that are at least partly integrated in the multilayered substrate; a transverse branch connected to ground in the first filter branch; and a resonator arranged in the transverse branch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A wireless communication device comprising:
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a radio system that operates in a first passband and a second passband, the second passband being established above the first passband, wherein a stop band is formed below the first passband; transmitting and receiving paths of the radio system, wherein the radio system is designed to receive a further signal in the stop band in order to filter out interference noise that is generated in the transmitting path and lies in the stop band between a transmitting path and an antenna; and a filter circuit coupled to the radio system, the filter circuit comprising; a multilayered substrate having integrated structured metallization planes; an input port and an output port; first and second filter branches coupled in parallel between the input port and the output port; a first subfilter arranged in the first filter branch, the first subfilter comprising a bandpass filter for the first passband; a second subfilter arranged in the second filter branch, the second subfilter comprising a high-pass filter having the second passband, wherein the bandpass filter and the high-pass filter are constructed from inductor and capacitor elements that are at least partly integrated in the multilayered substrate; a transverse branch connected to ground in the first filter branch; and a resonator arranged in the transverse branch.
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19. A wireless communication device comprising:
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an antenna; a transmitting path coupled to the antenna; a receiving path coupled to the antenna, the transmitting and receiving paths operating in the 1 and 2 gigahertz ranges; and a band-stop filter comprising; a multilayered substrate having integrated structured metallization planes; an input port and an output port; first and second filter branches coupled in parallel between the input port and the output port; a first subfilter arranged in the first filter branch, the first subfilter comprising a bandpass filter for a first passband in the 1 gigahertz range; a second subfilter arranged in the second filter branch, the second subfilter comprising a high-pass filter having a second passband in the 2 gigahertz range, the second passband being established above the first passband, wherein the bandpass filter and the high-pass filter are constructed from inductor and capacitor elements that are at least partly integrated in the multilayered substrate; a transverse branch connected to ground in the first filter branch; and a resonator arranged in the transverse branch; wherein the wireless communication device is designed to receive DVB-H signals for filtering out interference signals lying in a DVB-H frequency range from the transmitting path. - View Dependent Claims (20)
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Specification