KR101996443B1 - A antenna module for mobile terminal - Google Patents

Abstract

The present invention relates to an antenna device for a mobile communication terminal capable of frequency correction when inserting an external device, and more particularly, to an antenna device for a mobile communication terminal, An antenna 110 formed by cutting a part of a metal case Mc and connected to one side of the radiation pattern part 111 and having a metal case antenna part 112, And the external devices 10 and 20 are inserted into the external device inserting portions 121 and 122. The external device inserting portions 121 and 122 are formed by inserting the external device into the metal case antenna portion 112 so as to insert an external device into the external device inserting portions 121 and 122, A frequency transition detector 130 for detecting a transition of a resonance frequency in the antenna 110 when the antenna 110 is connected to the main PCB, A correction frequency calculating unit 140 for calculating a correction frequency value by comparing a value of the frequency of the input signal with a normal resonance frequency value, and a correction circuit selecting unit 140 for outputting a selection control signal in accordance with the correction frequency value calculated by the correction frequency calculating unit 140 And a frequency correction circuit unit 160 for receiving the selection control signal output from the correction circuit selection unit 150 and correcting the shifted resonance frequency to a normal resonance frequency according to the received selection control signal, According to this, there is an advantage that the performance of the antenna can be maintained even when an external device is inserted.

Description

TECHNICAL FIELD [0001] The present invention relates to an antenna device for a mobile communication terminal,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna of a mobile communication terminal, and more particularly, to an antenna of a mobile communication terminal capable of performing frequency correction when inserting an external device so as to prevent reception sensitivity of the antenna, To an antenna device for a mobile communication terminal.

2. Description of the Related Art [0002] In recent years, the display portion of a mobile communication terminal has been enlarged due to expansion of smart phones and the like. As the size of the display portion is increased, a case of a mobile communication terminal adopts a metal case implemented with a metal material.

Ante technology for a mobile communication terminal is known, in which a case of a mobile communication terminal adopts a metal case implemented with a metal material, and a part of the metal case is adopted as a radiation pattern of an antenna.

In the case of a mobile communication terminal adopting a part of a metal case as a radiation pattern of an antenna, a metal antenna used as a part of a metal case is generally provided with an insertion groove for a charging port for inserting a charging cable, And an earphone jack insertion groove for inserting the earphone jack.

When the external device such as the USB cable, USB cable or earphone jack is connected to the mobile communication terminal, the inventors of the present invention have a problem that the antenna performance of the antenna deteriorates I have noticed that.

However, a technique for solving the problem of deteriorating antenna performance when such an external device is connected to a mobile communication terminal has not been developed yet.

Literature 1. Patent Registration No. 10-0788676 (Notification date: December 26, 2007) Document 2. Japanese Patent Application Laid-Open No. 10-2014-0005400 (Publication date: 2014.01.15.)

It is an object of the present invention to provide an antenna device for a mobile communication terminal capable of frequency correction when inserting an external device according to the present invention,

First, in an antenna for a mobile communication terminal using a part of a metal case as an antenna, it is possible to correct a transition of a resonance frequency of an antenna, which occurs when an external device such as an earphone jack or a charging cable is inserted, and,

Second, by correcting the transition of the resonance frequency of the antenna, gain and power reduction of the antenna can be prevented,

Thirdly, a correction frequency value is calculated on the basis of the difference between the resonance frequency value of the resonance frequency of the antenna and the normal resonance frequency value, and a plurality of corrections having a capacitance value and an inductive capacitance value that match one- A circuit element is inserted into and connected to an antenna and only a correction circuit matching with a correction frequency value calculated among a plurality of correction circuit elements is selectively short-circuited with an antenna to correct the resonance frequency of the shifted antenna. And an antenna device for a mobile communication terminal capable of performing frequency correction when the device is inserted.

According to an aspect of the present invention, there is provided an antenna device for a mobile communication terminal, the antenna device including: a metal case of a mobile communication terminal; An antenna comprising a radiation pattern part formed on a carrier made of resin and a metal case antenna part formed by cutting a part of the metal case and having one end connected to one side of the radiation pattern part; An external device insertion portion formed through the inside and outside of the metal case antenna portion 112 so that an external device is inserted to connect the external device to the main PCB of the mobile communication terminal; A frequency transition detector for detecting an occurrence of a resonance frequency transition in the antenna when an external device is inserted into the external device insertion portion and connected to the main PCB; A correction frequency calculating unit for calculating a correction frequency value by comparing the shifted resonance frequency value detected by the frequency shift detecting unit with a normal resonance frequency value; A correction circuit selector for outputting a selection control signal in accordance with the correction frequency value calculated by the correction frequency calculator; And a frequency correction circuit section that receives the selection control signal output from the correction circuit selection section and corrects the shifted resonance frequency to a normal resonance frequency in accordance with the received selection control signal.

The antenna device for a mobile communication terminal capable of frequency correction when inserting an external device according to the present invention having the above-described configuration has the following effects.

First, in an antenna for a mobile communication terminal using a part of a metal case as an antenna, it is possible to correct a transition of a resonance frequency of an antenna, which occurs when an external device such as an earphone jack or a charging cable is inserted, It is effective.

Second, by correcting the transition of the resonance frequency of the antenna, it is possible to prevent the gain and the output of the antenna and the deterioration of the reception sensitivity.

Thirdly, a correction frequency value is calculated on the basis of the difference between the resonance frequency value of the resonance frequency of the antenna and the normal resonance frequency value, and a plurality of corrections having a capacitance value and an inductive capacitance value that match one- There is an effect that the resonance frequency of the shifted antenna can be corrected by connecting only the correction circuit matching the correction frequency value calculated in the plurality of correction circuit elements and selectively connecting the circuit element to the antenna.

As a result, the frequency correction operation can be reliably performed with a simple configuration.

1 is a conceptual block diagram of an essential part of an antenna device for a mobile communication terminal capable of frequency correction when an external device is inserted according to an embodiment of the present invention.
FIG. 2 is a bottom view of the case of the mobile communication terminal in FIG. 1. FIG.
3 is a block diagram of a main part of an antenna device for a mobile communication terminal capable of frequency correction when an external device is inserted according to an embodiment of the present invention.
FIG. 4 is a detailed circuit diagram of the frequency correction circuit unit 160 in FIG.
5 is a resonance graph when the present invention is applied and when it is not applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an antenna device for a mobile communication terminal capable of frequency correction when inserting an external device of the present invention will be described in detail with reference to the accompanying drawings.

As shown in the figure, an antenna device for a mobile communication terminal capable of frequency correction when inserting an external device according to an embodiment of the present invention includes a metal case Mc of a mobile communication terminal, And a metal case antenna part 112 formed by cutting a part of the metal case Mc and having one end connected to one side of the radiation pattern part 111, And an external device 10 or 20 (for example, a charging cable 10, a USB terminal, an earphone jack 20, or the like) for connecting the external devices 10 and 20 to a main PCB (not shown) And the external devices 10 and 20 are inserted into the external device insertion portions 121 and 122 so as to be connected to the main PCB And is emitted from the main PCB of the mobile communication terminal, A frequency transition detector 130 for detecting a transition of a resonance frequency of an output high frequency when the high frequency resonance frequency is generated, and a frequency comparator 130 for comparing the resonance frequency value detected by the frequency transition detector 130 and the normal resonance frequency value, A correction circuit selection unit 150 for outputting a selection control signal in accordance with the correction frequency value calculated by the correction frequency calculation unit 140; And a frequency correction circuit 160 for correcting the shifted resonance frequency to a normal resonance frequency according to the received selection control signal.

It is needless to say that insulation portions n1 and n2 are formed at the outer boundary of the metal case antenna portion 112 to be insulated from the metal case Cm.

The normal resonance frequency is a frequency of a base station where a mobile communication terminal is located.

In the antenna apparatus for a mobile communication terminal capable of performing frequency correction when inserting an external device according to an embodiment of the present invention, the frequency correction circuit unit 160 performs frequency correction on the selection control signal output from the correction circuit selection unit 150, And the frequency correction circuits 161, 162, 163, 164 adjust the resonance frequency shifted in accordance with the selection control signal received from the correction circuit selection section 150 to a preset frequency The correction circuit selector 150 corrects the shifted resonance frequency to a normal resonance frequency by shifting the shifted frequency by a displacement value, Wherein the plurality of frequency correction circuits (161, 162, 163, 164) output the selection control signal to any one of the correction circuits (161, 162, 163, 164) And shifts to different frequency displacement values according to the selection control signal received from the control unit (150).

In the antenna apparatus for a mobile communication terminal capable of performing frequency correction when inserting an external device according to an embodiment of the present invention, each of the frequency correction circuits 161, 162, 163 and 164 includes a switch 161a connected in parallel to the radiation pattern portion 111 162a, 163a, 164a, one end of which is connected directly to the switches 161a, 162a, 163a, 164a, and the other end is connected to the metal case antenna unit 112, and the shifted resonance frequency is shifted (L1, C1) (L2, C2) (L3, C3) (L4, C4) for correcting the shifted resonance frequency to a normal resonance frequency.

The correction circuit selection unit 150 includes a plurality of frequency correction elements L1 and C1 (L2 and C2) (L3 and C3) (L4 L2, C2 (L3, C3) (L4, C4) and the antenna 110 by outputting a selection control signal to the switches 161a, 162a, 163a, 164a connected to the frequency correction elements L1, .

(L2, C2) (L3, C3) (L4, C4) of the frequency correction elements (L1, C1) , At least one of a capacitive element and an inductive element.

Preferably, the frequency correction elements L1 and C1 (L2 and C2) (L3 and C3) (L4 and C4) adopt capacitors C1, C2, C3 and C4 as capacitive elements, And the inductors L1, L2, L3, and L4 are employed as the elements.

C2, C3, C4 and the inductors L1, L2, L3, L4 (L3, L4) are connected in series between the capacitors C1, ) Are connected in parallel.

The frequency correction elements L1 and C1 and the capacitance values of the capacitors C1 and C2 and the inductors L1 and L2 and L3 and L4 The resonance frequency shifted by the insertion of the external device is shifted to the normal resonance frequency by the inductance value of the resonance frequency.

The operation of the antenna device for a mobile communication terminal capable of frequency correction upon insertion of an external device according to an embodiment of the present invention will now be described.

When the external device such as the charging cable 10 or the earphone jack 20 is inserted, the inserted external device is connected to the main PCB. At this time, a change occurs in the ground of the main PCB. A transition of the resonance frequency occurs.

When the resonance frequency transition occurs, the frequency transition detector 130 detects the resonance frequency and detects the resonance frequency. This can be detected, for example, by detecting the difference between the resonance frequency value before the external device is connected and the resonance frequency value after the transition.

When the frequency transition detection unit 130 detects and detects the transition of the resonance frequency, the correction frequency calculation unit 140 compares the shifted resonance frequency value detected by the frequency transition detection unit 130 with the normal resonance frequency value, Lt; / RTI >

Calculation of the correction frequency value may be performed by various methods, and may be calculated on the basis of the difference value.

The frequency shift detection unit 130 and the correction frequency calculation unit 140 may be constituted by a program or a digital circuit.

There are provided a plurality of frequency correction circuits 161, 162, 163, and 164 having a capacitance and a magnetic capacity matched one-to-one with the correction frequency value calculated by the correction frequency calculation unit 140.

For example, when the correction frequency value calculated by the correction frequency calculating section 140 is DELTA f1, a first frequency (L1) composed of an inductor L1 having a first inductance value and a capacitor C1 having a first capacitance value When the correction elements L1 and C1 are matched and the correction frequency value calculated by the correction frequency calculation unit 140 is? F2, the inductance L2 having the second inductance value and the capacitor having the second capacitance value The inductance L3 having the third inductance value and the inductance L3 having the third inductance value when the correction frequency value calculated by the correction frequency calculating section 140 is? The third frequency correction elements L3 and C3 composed of the capacitor C3 having the third capacitance value are matched and when the correction frequency value calculated by the correction frequency calculation section 140 is? F4, the fourth inductance value The inductor L4 having the first capacitance value and the capacitor C4 having the fourth capacitance value And the fourth frequency correction elements (L4, C4) constituted are matched.

The correction circuit selection unit 150 receives the correction frequency value calculated by the correction frequency calculation unit 140. The correction circuit selection unit 150 receives the correction frequency value calculated by the correction frequency calculation unit 140, 161, 162, 163, and 164, respectively.

The selection control signal output from the correction circuit selection unit 150 is input to the switches 161a, 162a, 162b, 162c, 164c of the frequency correction circuits 161, 162, 163, 164 having the capacitances and capacitances matched with the correction frequency values calculated by the correction frequency calculation unit 140, 163a, and 164a, and the switches 161a, 162a, 163a, and 164a are switched on.

For example, when the correction frequency value calculated by the correction frequency calculating unit 140 is? F1 as in the above example, the correction circuit selecting unit 150, which receives? F1 from the correction frequency calculating unit 140, The first switch 161a of the first switch 161 outputs the selection control signal, and the first switch 161a receiving the selection control signal is switched on.

When the correction frequency value calculated by the correction frequency calculating section 140 is? F2, the correction circuit selecting section 150 that receives? F2 from the correction frequency calculating section 140 determines 2 switch 162a, and the second switch 162a receiving the selection control signal is switched on.

Similarly, when the correction frequency value calculated by the correction frequency calculating section 140 is? F3, the correction circuit selecting section 150 that receives? F3 from the correction frequency calculating section 140 outputs 3 switch 163a, and the third switch 163a receiving the switching control signal is switched on. When the correction frequency calculated by the correction frequency calculating unit 140 is? F4, The correction circuit selecting unit 150 receiving the error signal f4 from the error amplifier 140 outputs the selection control signal to the fourth switch 164a of the fourth frequency correction circuit 164 and the fourth switch 162a, Is turned on.

When the switches 161a, 162a, 163a and 164a are switched on, the capacitors C1, C2, C3 and C4 constituting the frequency correction circuits 161, 162, 163 and 164 connected in series to the switches 161a, 162a, 163a and 164a, And the inductors L1, L2, L3, and L4 form a closed circuit with the antenna 110, and the resonant frequency shifted by the capacitance value and the inductance value is shifted to the normal resonant frequency.

[Experimental Example]

5 shows a VSWR (Voltage Standing Wave Ratio) resonance graph.

The VSWR resonance (indicated by a pink line) indicated by point 1 is the resonance of the normal resonant frequency band generated by the antenna 110, and the resonant frequency is 1.61 GHz.

When an external device is inserted, it can be confirmed that the VSWR resonance graph (indicated by a blue line) is frequency shifted to 1.39 GHz, which is indicated by point 2.

In the case where the antenna device for a mobile communication terminal capable of frequency correction upon insertion of an external device according to an embodiment of the present invention according to the present invention is implemented, it can be confirmed at a resonance graph (indicated by a green line) As can be seen, the frequency band is shifted by the frequency correction circuits 161, 162, 163 and 164 connected in series with the antenna 110, and the shifted resonance frequency is corrected.

Meanwhile, in one embodiment of the present invention, the correction circuit selection unit 150 includes four frequency correction circuits 161, 162, 163, and 164, for example. However, the present invention is not limited thereto. Of course, fall within the technical scope of the present invention.

In one embodiment of the present invention, the frequency correction elements L1 and C1 (L2 and C2) (L3 and C3) (L4 and C4) constituting the frequency correction circuits 161, 162, L2, L3, and L4 or capacitors C1, C2, C3, and C4 are connected in parallel to each other, but the present invention is not limited thereto. C3, C4), and any combination of capacitive and inductive elements is of course within the scope of the invention as long as it is for frequency transition.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is self-evident to those who have.

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

Mc: Metal case of mobile communication terminal
110: antenna 111: radiation pattern part
112: metal case antenna part 10, 20: external device
121, 122: external device insertion unit 130: frequency shift detection unit
140: correction frequency calculating unit 150: correction circuit selecting unit
160: Frequency correction circuit
161, 162, 163, 164: frequency correction circuit
161a, 162a, 163a, 164a:
L: Inductor
C: capacitor

Claims (4)

A metal case Mc of the mobile communication terminal;
A metal case antenna part 112 formed by cutting a part of the metal case Mc and having one end connected to one side of the radiation pattern part 111, a radiation pattern part 111 formed on a resin- An antenna 110 comprising:
External device insertion portions 121 and 122 formed so as to pass through the inside and outside of the metal case antenna portion 112 so that external devices 10 and 20 are inserted to connect the external devices 10 and 20 to the main PCB of the mobile communication terminal, ;
A frequency transition detector 130 for detecting the occurrence of a resonance frequency transition in the antenna 110 when the external devices 10 and 20 are inserted into the external device insertion portions 121 and 122 and connected to the main PCB;
A correction frequency calculating unit 140 for comparing the shifted resonance frequency value detected by the frequency shift detecting unit 130 with a normal resonance frequency value of the antenna 110 to calculate a correction frequency value;
A correction circuit selector 150 for outputting a selection control signal in accordance with the correction frequency value calculated by the correction frequency calculator 140;
And a frequency correction circuit unit 160 that receives the selection control signal output from the correction circuit selection unit 150 and corrects the shifted resonance frequency to a normal resonance frequency according to the received selection control signal,
The frequency correction circuit 160,
And a plurality of frequency correction circuits (161, 162, 163, 164) that correspond one-to-one to the selection control signal output from the correction circuit selector (150)
The frequency correction circuits 161, 162, 163 and 164 shift the resonance frequency shifted in accordance with the selection control signal received from the correction circuit selection section 150 by a preset frequency shift value, Frequency,
The correction circuit selection unit 150 outputs a selection control signal to any one of a plurality of frequency correction circuits 161, 162, 163, and 164 matching with a correction frequency value calculated by the correction frequency calculation unit 140,
The plurality of frequency correction circuits 161, 162, 163, and 164 shift the frequency shift values to different frequency shift values according to the selection control signal received from the correction circuit selection unit 150,
The frequency correction circuit (161, 162, 163, 164)
A plurality of switches 161a, 162a, 163a, and 164a connected in parallel to the radiation pattern portion 111,
One ends of which are directly connected to the switches 161a, 162a, 163a and 164a in one-to-one relation and the other end is connected to the metal case antenna unit 112. The shifted resonance frequency is shifted and corrected to a normal resonance frequency Frequency correction elements L1 and C1 (L2 and C2) (L3 and C3) (L4 and C4)
The correction circuit selection unit 150 includes a plurality of frequency correction elements L1 and C1 (L2 and C2) (L3 and C3) (L4 and L4) that match the correction frequency values calculated by the correction frequency calculation unit 140, L2 and C2 (L3 and C3) (L4 and C4) and the antenna 110 by outputting selection control signals to the switches 161a, 162a, 163a and 164a connected to the frequency correction elements L1 and C1, Short,
The frequency correction elements (L1 and C1) (L2 and C2) (L3 and C3) (L4 and C4) are constituted by at least one of a capacitive element and an inductive element,
The frequency correction elements L1 and C1 (L2 and C2) (L3 and C3) (L4 and C4) employ capacitors C1, C2, C3 and C4 as capacitive elements and inductors L1, L2, L3, L4)
The capacitors C1, C2, C3, and C4 and the inductors L1, L2, L3, and L4 are connected in parallel to each other. The frequency correction elements L1 and C1 In addition,
The frequency correction elements L1 and C1 and the capacitance values of the capacitors C1 and C2 and the inductors L1 and L2 and L3 and L4 Wherein the resonant frequency shifted by the insertion of the external device is shifted to a normal resonant frequency by the inductance value of the external device.
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