Band pass filter and duplexer having the same
A band-pass filter, duplexer technology, applied in electrical components, impedance networks, etc., can solve the problems of increased manufacturing cost of inductors, increased number of inductors, unfavorable high integration and miniaturization, etc. The effect of integration, lowering manufacturing cost
Active Publication Date: 2007-08-15
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology
[0016] In summary, when manufacturing a conventional duplexer, the number of inductors used increases, which is not conducive to high integration and miniaturization
Using high-Q inductors increases manufacturing cost
Method used
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[0050] Specific exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0051] In the following description, the same reference numerals denote the same components even in different drawings. Matters defined in the following description such as a detailed structure and component description are provided as examples to help a comprehensive understanding of the present invention. Also, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
[0052] FIG. 1 is a block diagram of a bandpass filter according to an exemplary embodiment of the present invention.
[0053] Referring to FIG. 1 , a band pass filter according to an exemplary embodiment of the present invention includes: a first resonance circuit 100 , a second resonance circuit 200 and a third resonance circuit 300 .
[0054] The first resonance circuit may be located between the ...
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A band pass filter for improving filtering, realizing high integration, and reducing manufacturing costs, and a duplexer having the band pass filter. The band pass filter comprises a first resonant circuit in which n first resonators are connected in series, where n is a natural number greater than 1; a second resonator circuit which faces the first resonant circuit and has m second resonators connected in series, where m is a natural number greater than 1; and a third resonant circuit in which k third resonators are connected in parallel on branching lines linking the first and second resonant circuits, where k is a natural number greater than 1. By arranging the resonators of the respective resonant circuits in the bridge structure, the filtering characteristics can be improved, the number of inductors used to adjust the resonant frequency characteristics of the resonators can be reduced, high integration can be realized and manufacture cost can be reduced.
Description
technical field [0001] The present invention generally relates to a band-pass filter and a duplexer with the band-pass filter. More particularly, the present invention relates to a bandpass filter and a duplexer capable of improving filtering by improving signal attenuation while achieving high integration and reduced manufacturing costs. Background technique [0002] Recently, as the use of mobile communication devices such as mobile phones becomes more widespread, efforts are currently being made to improve the performance of mobile communication devices and to manufacture smaller and lighter devices. Therefore, methods of achieving miniaturization and weight reduction by improving the performance of components in mobile communication devices are being studied. [0003] One of the most fundamental components in a mobile communication device is the duplexer. A duplexer is a device that integrates filters. A duplexer allows effective sharing of the same antenna by separat...
Claims
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IPC IPC(8): H03H9/54H03H9/70
CPCH03H9/706H03H9/64H03H9/72
Inventor 朴允权宋寅相尹锡术南光祐
Owner SAMSUNG ELECTRONICS CO LTD