JPH0998009A - Resonance frequency control method for surface mount antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the defect rate of the surface mount antennas by scraping off a prescribed part of component electrode to obtain a non-defective antenna having the prescribed resonance frequency if a produced antenna has its resonance frequency different from the prescribed value. SOLUTION: If the frequency of a produced surface mount antenna has an error at its lower level, a part 1a of a ground electrode 3a (3b) is scraped off by a rooter 6, etc., or a part (b) of a capacitance loading electrode 4 is scraped off by the rooter 6. Therefore, the electrode areas of capacitors which are secured among these electrodes 3a (3b) and 4 are reduced. Then the load capacitance is reduced and the resonance frequency is increased. On the other hand, a part (c) of a radiation electrode 5 is shaved off by the rooter 6 when the resonance frequency has an error at its higher level. Therefore, the inductance is increased and the resonance frequency is reduced. As a result, the defect rate is improved for the surface mount antennas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the resonance frequency of a surface mount antenna used for mobile communication equipment such as a mobile phone and a wireless LAN (Local Area Network).

[0002]

2. Description of the Related Art FIG. 3 shows a conventional electromotive type surface mount antenna. The power supply terminal 2 is provided on one end surface 1a of the base body 1.
And two ground electrodes 3a and 3b are formed by disposing the ground electrodes 3a and 3b on both sides of the power supply terminal 2, respectively. Further, a capacitance loading electrode 4 is formed on the other end surface 1b of the base 1 which faces the one end surface. A radiation electrode 5 is formed on the surface of the substrate 1 so that both ends thereof are connected to the power supply terminal 2 and the capacitance loading electrode 4, respectively.

The conventional surface mount antenna has the above structure, and its electrical equivalent circuit is as shown in FIG. L is the inductance of the radiation electrode 5, R is the radiation resistance, C is the loading capacitance formed between the ground electrodes 3a, 3b and the capacitive loading electrode 4, and the loading capacitance C is in the series circuit of the inductance L and the radiation resistance R. The parallel connection is made, and the high frequency signal f is applied in parallel to the parallel circuit to be excited.

FIG. 5 shows another conventional electromotive current type surface mount antenna. One opposing end surface 1 of the base body 11
A ground electrode 12 and a power supply terminal 13 are formed on 1a. A capacitance loading electrode 14 is provided on the other end surface 11b of the base 11 that faces the one end surface.

The ground electrode 12 is formed on the surface of the substrate 11.
Radiation electrodes 15 having both ends connected to the capacitor loading electrode 14 are formed. Further, the power supply electrode 16 is connected to the surface of the base 11 between the power supply terminal 13 and the matching portion 15 a of the radiation electrode 15.

Another conventional surface mount antenna has the above structure. The surface mount antenna shown in FIG. 5 is represented by an electrically equivalent circuit as shown in FIG. In the figure, C1 is a ground electrode 12 and a capacitance loading electrode 14
It is the loading capacity formed between and. L1 is a radiation electrode 1
5 has an inductance. The loading capacitance C1 and the inductance L1 form a parallel resonance circuit. R1
Is a radiation resistance existing in parallel with this parallel resonant circuit.
The high frequency signal f is applied to approximately the middle of the inductance L1.

[0007]

However, the conventional surface mount antenna shown in FIG. 3 is a defective product when the resonance frequency determined by the loading capacitance C and the inductance L is different from a predetermined value. It was disposed of as, and the rate of non-defective products was reduced.

The conventional surface mount antenna shown in FIG. 5 is also disposed as a defective product if the resonance frequency determined by the loading capacitance C1 and the inductance L1 is different from a desired value, and the product is a good product. The rate was decreasing.

Therefore, according to the present invention, when the resonance frequency of the manufactured surface mount antenna is different from a predetermined value, the surface frequency can be adjusted to a predetermined resonance frequency to improve the yield rate. An object of the present invention is to provide a method for adjusting the resonance frequency of a mounted antenna.

[0010]

In order to achieve the above-mentioned object, the present invention provides a substrate with a power supply terminal and at least one ground electrode formed on one end face of the substrate, and the other end face opposite the one end face. The ground electrode of the surface-mounted antenna, the capacitive loading electrode is formed on the end surface, and the radiation electrode whose both ends are respectively connected to the power feeding terminal and the capacitive loading electrode is formed on one main surface of the base body; A resonance frequency adjusting method for a surface mount antenna, comprising adjusting the resonance frequency by cutting off at least a part of at least one of the electrode or the radiation electrode.

Further, according to the present invention, a ground electrode and a power supply terminal are formed on one end face of the base body, and a capacitance loading electrode is formed on the other end face of the base body. Surface mounting in which a radiation electrode having both ends connected to a ground electrode and the capacitance loading electrode is formed, and a power feeding electrode is connected to one main surface of the base between the power feeding terminal and a matching portion of the radiation electrode. A resonance frequency adjusting method for a surface mount antenna, wherein the resonance frequency is adjusted by scraping off the radiation electrode, the ground electrode, the capacitance loading electrode or the power feeding electrode of the type antenna.

As described above, according to the present invention, when the resonance frequency of the manufactured surface mount antenna is different from the predetermined value, the resonance frequency is adjusted by cutting a part of the constituent electrodes of the antenna. You can That is, by cutting a part of the ground electrode and the capacitance loading electrode, the loading capacitance is reduced and the resonance frequency of the antenna is increased.
Further, by cutting a part of the radiation electrode, the inductance is increased and the resonance frequency of the antenna is lowered.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a resonance frequency adjusting method for a surface mount antenna according to the present invention. The structure of the surface mount antenna and the electrical equivalent circuit thereof referred to in the description of this embodiment are shown in FIGS.
Since it is the same as the conventional example referred to in (1), the structure of the antenna referred to in the present embodiment is denoted by the same reference numeral as in the conventional example, and the description thereof will be incorporated.

In the method for adjusting the resonance frequency of the surface mount antenna according to this embodiment, first, when the resonance frequency of the manufactured surface mount antenna is deviated to the lower side, one of the ground electrodes 3a (3b) is removed. For example, the part a is scraped off by the lutor 6, or the part b of the capacitive loading electrode 4 is scraped off by the lutor 6 in the same manner. Ground electrode 3a
(3b) and the capacitance loading electrode 4 correspond to the electrodes of the capacitor forming the loading capacitance C (see FIG. 3). Therefore, the ground electrode 3a (3b) or the capacitance loading electrode 4
Is equivalent to reducing the electrode area of the capacitor formed between them, the loading capacitance C is reduced, and the resonance frequency of the surface-mounted antenna is increased. By this frequency adjustment, The surface-mount type antenna according to the manufacturing, which has a low resonance frequency, has a high resonance frequency and becomes a good product.

Further, the manufactured surface mount antenna is
If the resonance frequency is shifted to the higher side, the radiation electrode 5
Part of c is scraped off with a lute 6. The radiation electrode 5 functions as an inductance L in the electrical equivalent circuit of FIG. Cutting off a part of the radiation electrode 5 increases the inductance L, and by this frequency adjustment, the surface mount antenna according to the manufacturing, which has a high resonance frequency, has a low resonance frequency and becomes a good product.

In the above embodiment, two ground electrodes are provided on both sides of the power supply terminal, but one ground electrode may be provided.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The figure shows a method of adjusting the resonance frequency of the surface-mounted antenna of this embodiment. The structure and the electrical equivalent circuit of the surface mount antenna to which the description of this embodiment is referred are the same as those of the conventional example referred to in FIG. 5 and FIG. 6, so the description given in the conventional example is used to avoid duplication. I will decide.

In the method of adjusting the resonance frequency of the surface mount antenna according to the present embodiment, first, when the manufactured surface mount antenna is displaced toward the lower resonance frequency, a part a of the ground electrode 12 is removed. For example, Leuta 17
Or the part e of the capacitance loaded electrode 14 is similarly scraped off by the lutor 17. The ground electrode 12 and the capacitance loading electrode 14 correspond to the electrodes of the capacitor forming the loading capacitance C1 (see FIG. 6). Therefore, cutting the ground electrode 12 or the capacitance loading electrode 14 corresponds to reducing the electrode area of the capacitor formed between them, and the loading capacitance C1 decreases and the resonance frequency increases. By this frequency adjustment, the surface mount antenna according to the manufacturing, which has a low resonance frequency, has a high resonance frequency and becomes a good product.

Further, the manufactured surface mount antenna is
When the resonance frequency is shifted to the higher side, the radiation electrode 1
A part f of 5 is scraped off by the lute 17. This radiation electrode 1
In the electrically equivalent circuit of FIG. 6, 5 acts as an inductance L1. Cutting a part of the radiation electrode 15 increases the inductance L1.
By this frequency adjustment, the surface mount antenna according to the manufacturing, which has a high resonance frequency, has a low resonance frequency and becomes a good product.

In the above embodiments, the radiation electrode has a straight type, and the matching type of the straight type radiation electrode is intermediately fed with power. However, in the present invention, the radiation electrode has a U-shape and a bent shape. It can also be applied to shapes, curved shapes, meander shapes, and the like.

[0021]

According to the present invention, when the resonance frequency of the manufactured surface mount antenna is different from a predetermined value, a predetermined portion of the surface mount antenna component electrode is cut to reduce the loading capacity. , Also increase the inductance,
Those having a low resonance frequency are adjusted to be high, and those having a high resonance frequency are adjusted to be low to obtain a non-defective product having a predetermined resonance frequency, and the non-defective rate can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view of a surface mount antenna for explaining a first embodiment of a resonance frequency adjusting method for a surface mount antenna according to the present invention.

FIG. 2 is a perspective view of a surface mount antenna for explaining a second embodiment of the resonance frequency adjusting method for the surface mount antenna according to the present invention.

FIG. 3 is a perspective view of a conventional surface mount antenna.

FIG. 4 is an electrical equivalent circuit diagram of the surface mount antenna shown in FIGS. 1 and 3.

FIG. 5 is a perspective view of another conventional surface mount antenna.

FIG. 6 is an electrical equivalent circuit diagram of the surface mount antenna shown in FIGS. 2 and 5.

[Explanation of Codes] 1, 11 Bases 1a, 11a One end face 1b, 11b Other facing end faces 2, 13 Feeding terminals 3a, 3b, 12 Ground terminals 4, 14 Capacitive loading electrodes 5, 15 Radiating electrodes 6, 7 Luta

Claims (3)

[Claims] 1. A power supply terminal and at least one ground electrode are formed on one end surface of a base body, and a capacitance loading electrode is formed on another end surface facing the one end surface, and one main surface of the base body is formed. A part of at least one of the ground electrode, the capacitive loading electrode or the radiating electrode of the surface-mounted antenna in which radiating electrodes having both ends connected to the power feeding terminal and the capacitive loading electrode are formed. A method for adjusting a resonance frequency of a surface-mounted antenna, which comprises adjusting the resonance frequency by scraping. 2. A ground electrode and a power supply terminal are formed on one end face of a base body, a capacitance loading electrode is formed on the other end face of the base body, and the ground electrode and the ground electrode are formed on one main surface of the base body. A radiation electrode whose both ends are respectively connected to the capacitive loading electrode is formed, and the above-mentioned surface mount antenna in which a feeding electrode is connected to one main surface of the base between the feeding terminal and the matching portion of the radiation electrode. A resonance frequency adjusting method for a surface-mounted antenna, wherein the resonance frequency is adjusted by cutting off at least a part of at least one of the radiation electrode, the ground electrode, or the capacitance loading electrode. 3. The resonance frequency adjusting method for a surface mount antenna according to claim 1, wherein the radiation electrode has a straight shape, a U-shape, a bent shape, a curved shape, or a meandering shape.