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Duplexer

A duplexer and filter technology, applied in the field of duplexers, can solve problems such as unmentioned coupling

Inactive Publication Date: 2010-01-13
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the above-mentioned coupling problems are not mentioned in these patent documents, and the inventions of these patent documents cannot solve the above-mentioned problems

Method used

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Embodiment Construction

[0075] Below, refer to figure 1The shown plan view describes the structure of the duplexer 1 of the present embodiment. The duplexer 1 is also composed of a low-frequency side filter 3 and a high-frequency side filter 4 like the above-mentioned duplexer 100, wherein the low-frequency filter 3 is composed of a ladder-type filter connected with six sections of SAW resonators, and the high-frequency filter 4 is also composed of a ladder filter. In this duplexer 1 , the connection sequence of SAW resonators constituting each filter is the same as that of the low-frequency side filter 3 and high-frequency side filter 4 in the duplexer 100 described above, and thus description thereof will be omitted.

[0076] exist figure 1 In the duplexer 1, the filters 3 and 4 are provided and formed on a common quadrangular piezoelectric substrate 10, at the center of the piezoelectric substrate 10 in the left-right direction, at a position on the rear side of the substrate. An antenna port...

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Abstract

The invention provides a duplexer which is small in size and excellent in separation characteristic of transmission / reception signals. An antenna port is disposed on a center of a rearward side in a disposition area of a duplexer, a high band side filter and a low band side filter are respectively disposed on a left side and a right side of the antenna port, a parallel arm at a last stage in the low band side filter, a parallel arm at a last stage in the high band side filter, a first signal port and a second signal port seen from the antenna port are positioned on a forward side of the antenna port, a ground side of a parallel arm on a front stage side of the parallel arm at the last stage in the low band side filter and a ground side of a parallel arm on a front stage side of the parallel arm at the last stage in the high band side filter are mutually connected via a conductive path formed on a piezoelectric substrate at a rearward side of the antenna port, and the parallel arms connected by the conductive path are positioned on the rearward side of the parallel arms at the last stages. Accordingly, a separation characteristic at a high band side is improved.

Description

technical field [0001] The present invention relates to a duplexer that separates and extracts transmission signals and reception signals having different frequencies in order to receive and transmit information using a common antenna. Background technique [0002] In a device having a two-way wireless communication function such as a mobile phone and a wireless communication system using such a device as a communication terminal, in order to transmit and receive information using one antenna of the communication terminal, the frequency of the transmission radio wave and There is a difference in the frequency of the received radio wave, and the transmission signal and the reception signal are separated by a duplexer using the frequency difference. [0003] The structure of the duplexer includes: a filter on the receiving side that selects the frequency of the received radio wave and outputs it to the reception processing unit in the device; and selects the frequency of the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/213
CPCH03H9/725H03H9/02952
Inventor 川元俊彦吉元进
Owner NIHON DEMPA KOGYO CO LTD
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