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Frequency variable antenna circuit, antenna component constituting the same, and wireless communication device using those

An antenna circuit and antenna element technology, which is applied to components of resonant antennas, devices and circuits that enable antennas to work in different bands at the same time, can solve the problems of large-scale antennas and easy degradation of VSWR characteristics, etc.

Inactive Publication Date: 2012-09-26
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this antenna having a structure in which the antenna element and the parasitic antenna element are electromagnetically coupled, as the resonance frequency of the low frequency band changes, the resonance frequency of the higher frequency band also changes, and there is a problem that the VSWR characteristic tends to deteriorate.
In addition, since the antenna element and the parasitic antenna element are arranged planarly, there is also a problem that the size of the antenna is increased.

Method used

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  • Frequency variable antenna circuit, antenna component constituting the same, and wireless communication device using those
  • Frequency variable antenna circuit, antenna component constituting the same, and wireless communication device using those
  • Frequency variable antenna circuit, antenna component constituting the same, and wireless communication device using those

Examples

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Effect test

Embodiment 1

[0120] Figure 26 Showing an example of the frequency variable antenna part of the present invention (corresponding to low frequency band and high frequency band), Figure 27 and Figure 28 Indicates its appearance. In the figure, the power supply path from the frequency adjustment mechanism 30 to the variable capacitance circuit Cv is omitted.

[0121] The variable frequency antenna circuit 1 is formed on an antenna substrate 80 which is separated from a main circuit substrate (not shown) on which a power supply circuit 200 is formed, and the antenna substrate 80 and the main circuit substrate are connected by a coaxial cable. Another connection method is, for example, a press connection (called C-clip) using a grounded leaf spring terminal provided on the main circuit board. In this case, the connecting portion of the antenna substrate is only the connecting electrode terminal.

[0122] The antenna element 10 formed of a conductive thin plate made of Cu is composed of th...

Embodiment 2

[0135] Figure 30 Showing the configuration of the variable frequency antenna circuit of Embodiment 2, Figure 31 and Figure 32 Indicates its appearance. The description of the parts common to the first embodiment among the frequency-variable antenna circuit is omitted.

[0136] The configuration of the antenna element is substantially the same as that of the first embodiment except that the section 10f is added as the first antenna element. Since the antenna element cannot be sufficiently grown in the limited space within the casing of the mobile phone, the resonance frequency of the main mode is fine-tuned in the interval 10f, thereby making the resonance frequency reach a desired frequency. Since the distance from the ground electrode is preferable to increase the radiation gain, the section 10 a is set at a height of about 4.5 mm from the main surface of the antenna substrate 80 .

[0137] The wide area surface of the section 10b of the first antenna element 10 extend...

Embodiment 3

[0144] Figure 33 An example of an antenna component in which the position of the coupling mechanism 20 is different is shown. The coupling mechanism 20 is electromagnetically coupled to the section 10e of the first antenna element 10, so that the frequency adjustment mechanism 30 is isolated from the feeding point A. FIG. Another dielectric chip 115 is arranged so as to be in contact with the section 10 b of the first antenna element 10 and the section 12 b of the second antenna element 12 . The configuration of the antenna element and the frequency adjustment mechanism 30, etc. are the same as those of the second embodiment, and therefore description thereof will be omitted.

[0145] Figure 34 The resonance frequency dependence of the average gain when the connection path of the switch SW constituting the variable capacitance circuit Cv of the frequency adjustment mechanism 30 is changed in the second and third embodiments is shown. The antenna parts of each embodiment, ...

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Abstract

Provided is an antenna component which is provided with an antenna element provided on a mounting board which is separated from a main circuit board, a connection means provided on the mounting board so as to be electromagnetically connected to the antenna element, and a frequency adjustment means provided on the mounting board so as to be connected with the connection means. The antenna element has a band-like first antenna element and a band-like second antenna element, which are integrally connected with each other so as to share a power supply point. The second antenna element is shorter than the first antenna element. The connection means is formed on a dielectric chip attached to the mounting board, and has a connection electrode for electromagnetically connecting with a part of the first antenna element. The frequency adjustment means is provided with a parallel resonance circuit including a variable capacitance circuit and a first inductance element and a second inductance element which is serially connected with the parallel resonance circuit.

Description

technical field [0001] The present invention relates to a frequency-variable antenna circuit capable of changing a resonance frequency, an antenna component constituting at least a part thereof, and a wireless communication device including such an antenna component and corresponding to a plurality of frequency bands. Background technique [0002] In response to the rapid spread of wireless communication devices such as mobile phones, the frequency range used by communication systems is also wide. In particular, recently, mobile phones corresponding to multiple transmission and reception bands such as dual-band, triple-band, and quad-band are increasing. For example, in a four-band mobile phone corresponding to the communication system of GSM (registered trademark) 850 / 900 frequency band, DCS frequency band, PCS frequency band, and UMTS frequency band, because the GSM (registered trademark) 850 / 900 frequency band uses 824-960MHz, DCS The frequency band uses 1710-1850 MHz, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q9/14H01Q1/38H01Q5/01H01Q9/42H01Q5/10H01Q5/15
CPCH01Q5/0068H01Q9/42H01Q5/392
Inventor 林健儿冈本浩志井手野博人
Owner PROTERIAL LTD
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