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mobile terminal

A mobile terminal and frame technology, applied in the field of communication, can solve problems such as integrated design of metal frame antenna, poor antenna radio frequency performance, difficult antenna debugging, etc., achieve convenient and flexible debugging, improve utilization rate, and avoid structural modification effect of demand

Active Publication Date: 2019-06-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the cellular antenna in the 4G LTE mobile phone, there are roughly three solutions in related technologies: one of the solutions is to use FPC (Flexible Printed Circuit, flexible printed circuit board) or LDS (Laser Direct Structuring, laser direct structuring) technology to make the antenna on the On the isolated plastic bracket or plastic shell, the metal frame cannot be integrated with the antenna, resulting in poor radio frequency performance of the antenna; the second solution is to directly feed power to the slotted bottom frame as the antenna radiator, which makes it difficult to debug the antenna; solution three Part of the antenna radiator uses FPC or LDS to make the antenna on an isolated plastic bracket or plastic shell, and the other part of the antenna radiator is directly connected to the bottom metal frame. Due to the need for additional FPC or LDS antenna components, the cost is too high and assembly complex

Method used

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Examples

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Effect test

Embodiment 1

[0067] Such as Figure 16 As shown, this example is for a metal-frame mobile terminal with a "5.5-inch screen, MIC and USB placed in the clear area of ​​the antenna". The antenna structure is as follows: Figure 4 Based on the scheme shown, only the MIC and USB grounding areas are introduced. The basic information of other models is as follows:

[0068] The length, width and height of the square area formed by the metal frame are (147mm*76mm*5.5mm). In order to simulate the influence of the plastic shell of the actual mobile phone, a plastic material with a thickness of 1mm is set on the upper and lower spaces of the square area (dielectric constant 2.7, loss angle Tangent 0.03@10GHz), the length of the middle metal frame 4 is 48mm, and the width of the slots 2 and 3 is 0.8mm.

[0069] The PWB clearance area 22 is 8 mm in the length direction of the mobile phone.

[0070] The selected inductor and capacitor values ​​are 2nH for L3, 9nH for L4, 4nH for L5, 1.6pF for C1, 1.2pF...

Embodiment 2

[0073] Such as Figure 19 As shown, this example is for a metal-frame mobile phone with a "4.4-inch screen, only the MIC is placed in the clear area of ​​the antenna". The antenna structure is as follows: Figure 4 On the basis of the scheme shown, there are the following changes:

[0074] Because the set frame size basically meets the requirements, L1 and L2 for auxiliary fine-tuning of the electrical size of the metal frame are omitted.

[0075] At the same time, because the USB is not placed in the antenna clearance area and the size of the clearance area is reasonable, the first resistor R1 for balancing the low-frequency impedance mismatch and radiation efficiency of the antenna is also omitted.

[0076] In addition, in the feeding matching network 50, a coupling capacitor "first capacitor C1" formed by a gap between a suspended wire at the end and the metal frame 4 and the first connector 40 is used to replace the Figure 5 The first capacitor C1 in the fast matching n...

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Abstract

The invention discloses a mobile terminal. The mobile terminal comprises a shell, a printed circuit board arranged in the shell, a metal frame around the shell, a first connector and a feed matching network, wherein the printed circuit board comprises a main circuit region and a clearance region; the clearance region is positioned below the main circuit region; the metal frame comprises a first frame and a second frame positioned on the two sides of the shell, and a third frame positioned at the bottom of the shell; the third frame is provided with a first side seam and a second side seam; an antenna main radiator is formed in the framework between the first side seam and the second side seam; one end of the first connector is connected with the antenna main radiator; one end of the feed matching network is connected with the other end of the first connector; the other end of the feed matching network is connected with the feed port in the main circuit region; and the first connector and the feed matching network are arranged in the clearance region. According to the mobile terminal, the cost is lowered, the antenna radiation performance is improved, and convenient debugging of the antenna is realized.

Description

technical field [0001] The present invention relates to the technical field of communications, and in particular to a mobile terminal. Background technique [0002] The design of the main cellular (cellular antenna) antenna of metal frame mobile phones is very difficult. On the one hand, especially 4GLTE (Long Term Evolution, long-term evolution, which is the fourth-generation mobile antenna standard) mobile phones have more and more requirements for antenna frequency band, bandwidth and radio frequency performance. The harsher it is, on the other hand, the metal frame added around will significantly inhibit the antenna radiation performance. This results in either a trade-off between the radio frequency performance of the mobile phone and the beautiful metal texture metal frame design, or breaking through the existing antenna technology and innovating a new antenna technology to take both into account. [0003] For the cellular antenna in the 4G LTE mobile phone, there are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/44H01Q1/36H01Q1/50H04M1/02
Inventor 郭庆余
Owner BYD CO LTD
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