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Communication device

A wireless communication device and passband technology, which is applied in wireless communication, electrical components, transmission systems, etc., can solve the problem that the antenna is easy to change, and achieve the effect of suppressing load fluctuations

Inactive Publication Date: 2011-01-19
SHARP KK
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  • Abstract
  • Description
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Problems solved by technology

Therefore, the impedance of the antenna will easily change under the influence of factors such as the human body

Method used

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Embodiment Construction

[0074] The "passband bandwidth" used in this specification refers to the bandwidth of frequencies actually used for communication, and includes the bandwidth of filters that are physically wider than this bandwidth. That is, since impedances at frequencies used for communication are discussed here, impedances at frequencies other than those used are not involved.

[0075] Hereinafter, a multi-band compatible wireless communication device according to each embodiment of the present invention will be described by taking a mobile communication device as an example with reference to the accompanying drawings.

[0076] A multi-band compatible wireless communication device according to the present invention is characterized in that the bandwidth of the first filter is narrowed, and the narrowed bandwidth is covered by a second filter different from the first filter.

[0077] Furthermore, when the PA is used over a wide frequency band, the load impedance region in which good distorti...

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Abstract

A first filter (63a) and a second filter (63b) having a pass-band are provided in the frequency band in which frequency bands of f1 to f4 are, for example, substantially two-way divided. In this case, the first filter (63a) and the second filter (63b) enter each other's areas across a divided frequency (f5). In reality, even if the frequency bands are not two-way divided, the frequency domain on the side of a second frequency band (61b) of a frequency band (a first frequency band (61a)) with a wider bandwidth is constructed so as to be covered with the second filter (63b). This makes it possible to suppress the influence of load variations in a multiband-capable radio communication device.

Description

technical field [0001] The present invention relates to a communication device, and in particular to a filter construction technique for realizing an amplifier suitable for a multi-band compatible wireless communication device. Background technique [0002] As mobile terminal devices such as mobile phones are increasingly used, mobile terminal devices that can be used across borders (ie, multi-band wireless communication terminal devices) have also been actively developed so as to allow global roaming. Although there is already a trend towards global standardization of frequency allocations, this is only gradually being put into practice. When looking at the frequency bands adopted by each country, it can be found that a certain frequency band is allocated as a transmission frequency band in some areas, and is allocated as a reception frequency band in other areas. Furthermore, in response to the standardization trend, there may be a need to accommodate multiple frequency b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04B1/04H04B1/3822H04W88/06
CPCH04B1/0067H04B1/0057H04B1/52H04B1/006
Inventor 柏木宏贵
Owner SHARP KK
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