Mobile terminal broadband antenna with adjustable capacitors for impedance matching

A technology for mobile terminals and impedance matching, which is applied in the connection of antennas, antenna grounding switches, devices that enable antennas to work in different bands at the same time, and can solve the problems that adjustable capacitor antennas cannot be widely used in high-efficiency and broadband applications. Achieve the effects of effective expansion of working bandwidth, easy production, and convenient miniaturization design

Active Publication Date: 2015-02-25
SHANGHAI AMPHENOL AIRWAVE COMM ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a mobile terminal broadband antenna that uses an adjustable capacitor for impedance matching to solve the problem that the existing adjustable capacitor antenna cannot be widely used due to the insertion loss and parasitic effects of the adjustable capacitor itself. Issues for High Efficiency, Broadband Applications

Method used

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  • Mobile terminal broadband antenna with adjustable capacitors for impedance matching
  • Mobile terminal broadband antenna with adjustable capacitors for impedance matching
  • Mobile terminal broadband antenna with adjustable capacitors for impedance matching

Examples

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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the mobile terminal broadband antenna provided by the present invention adopts adjustable capacitance for impedance matching, including a bracket 100, an antenna body 200 fixed on the bracket 100, and an antenna matching circuit 300 ( figure 1 not shown), the antenna body 200 is electrically connected to the antenna matching circuit 300 . Such as figure 2 As shown, the antenna body 200 is an elongated structure with a feeding point 201 and a grounding point 202 on the elongated structure. The elongated structure is divided into a long arm 204 and a short arm by the feeding point 201 203 , the grounding point 202 is located on the short arm 203 .

[0029] The width of the long arm 204 and the short arm 203 is the maximum width of the support 100, and the length of the elongated structure is the maximum length of the support 100, that is, the antenna body is spread as much as possible on the support, which can maximize the maximum width of a ...

Embodiment 2

[0034] In this embodiment, except that the antenna matching circuit is different from that in Embodiment 1, other parts are the same as in Embodiment 1. The antenna matching circuit 300 in this embodiment is as Figure 4 As shown, the first inductance 303 is added on the basis of the antenna matching circuit provided in the first embodiment. Wherein, one end of the first inductor 303 is grounded, and the other end is connected to the second end of the first adjustable capacitor 301 . In this embodiment, the second adjustable capacitor 302 and the first inductor 303 constitute an LC resonant circuit. The resonant wave formed by the LC resonant circuit will form a double resonant wave together with the existing low-frequency resonant wave in the 698-960MHz frequency band, which broadens the frequency bandwidth of a single state.

Embodiment 3

[0036] In this embodiment, except that the antenna matching circuit is different from that in Embodiment 1, other parts are the same as in Embodiment 1. The antenna matching circuit 300 in this embodiment is as Figure 5As shown, the second inductor 305 and the third adjustable capacitor 304 are added on the basis of the antenna matching circuit provided in the second embodiment. Wherein, one end of the second inductor 305 is grounded, and the other end is connected to the ground point 202 of the antenna body 200 ; one end of the third adjustable capacitor 304 is grounded, and the other end is connected to the first end of the first adjustable capacitor 301 . The second inductor 305 in this embodiment can effectively improve the return loss of the antenna in the low frequency band, and the third adjustable capacitor 304 is used to improve the performance of the antenna in the high frequency band. When the capacitance value of the third adjustable capacitor is adjusted, the re...

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Abstract

The invention provides a mobile terminal broadband antenna with adjustable capacitors for impedance matching. The whole antenna is formed by an antenna matching circuit composed of the adjustable capacitors and an antenna body arranged on a support in a covering mode. The antenna body is an IFA antenna and is suitable for mobile terminal devices which become smaller and smaller, the first end of the first adjustable capacitor is connected with the antenna body, the second end of the first adjustable capacitor is connected with an external device, the second adjustable capacitor is connected with the first end of the first adjustable capacitor, and the other end of the second adjustable capacitor is grounded. Through the antenna matching circuit of the basic structure, the working frequency band of the antenna can be conveniently adjusted so that impedance matching between the antenna body and the external device can be achieved, and the working bandwidth of the antenna can be effectively broadened. The antenna is simple in structure, easy to manufacture, suitable for being applied in a severe environment and small in size, and does not occupy too much space, and the minimization design of a mobile terminal provided with the antenna is facilitated.

Description

technical field [0001] The invention relates to a mobile terminal antenna, in particular to a mobile terminal broadband antenna that uses an adjustable capacitor for impedance matching. Background technique [0002] In recent years, as the LTE system has become more and more popular in mobile phones, mobile phone antennas have been evolving towards thinner and shorter designs. The space that LTE antennas can occupy is decreasing, but the bandwidth must be relatively increased, resulting in a decrease in antenna efficiency. Engineers are facing three major technical difficulties, including how to effectively expand the frequency band supported by LTE mobile phone antennas; the gestures of mobile phone users will cause impedance shifts, reducing the efficiency of antenna transmission; and how to reduce the size of the antenna Under the design, that is, while maintaining the performance of the RF antenna, it does not affect the occupied space of the system. [0003] In order t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/50H01Q1/36H01Q5/10H01Q5/20H01Q5/335
Inventor 何大伟
Owner SHANGHAI AMPHENOL AIRWAVE COMM ELECTRONICS CO LTD
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