JP2530851Y2 - antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a structure of a connection conductor of an antenna including a radiation conductor plate, a ground conductor plate, and a connection conductor.

〔Overview〕

The present invention relates to an antenna in which a radiation conductor plate and a ground conductor plate are connected by a connection conductor portion, and a part of the connection conductor portion is formed into a group of a large number of thin conductors having a comb shape, so that the resonance of the antenna after fabrication is achieved. The frequency can be easily adjusted.

[Conventional technology]

The conventional example shown in FIG. 6 has a low-profile shape including a radiation conductor plate (hereinafter, referred to as a radiation plate) 1, a connection conductor portion (hereinafter, referred to as a connection portion) 6, and a ground conductor plate (hereinafter, referred to as a ground plate) 2. in the antenna, it is obtained by downsizing the conventional patch antenna in _^1/2. In FIG. 6, reference numeral 5 denotes a power supply pin. The width W ₂ of the connecting portion to the width W ₁ of the radiating plate 1 is chosen to be equal. Further, a distance S (hereinafter referred to as a power supply point position) between the connection portion 6 and the power supply pin 5 is selected so that the power supply line and the antenna can be well matched.

The height H of the antenna in FIG. 6 is selected to be sufficiently small with respect to the wavelength λ. Therefore, at a frequency of about 10 GHz or higher, H ≦ 2 mm, so that the antenna of FIG.
From the viewpoint of facilitating the production, it is advantageous to form the entire structure using a double-sided copper-clad dielectric. On the other hand, several GH
At a frequency of z or lower, H is about several cm, so that one metal plate may be bent so that the radiation plate and the connection plate may be integrated.

As described above, the antenna shown in FIG. 6 can be manufactured by various methods. However, the manufactured antenna may require adjustment of the resonance frequency due to the effects of machining accuracy, variation in the relative permittivity of the dielectric substrate, and the like. is there.

Conventionally, the frequency has been adjusted by cutting the radiation plate to shorten the radiation plate length, or by attaching a conductor plate to the radiation plate to increase the radiation plate length.

[Problems to be solved by the invention]

However, the adjusting method described above has a disadvantage that the operation takes a very long time.

An object of the present invention is to provide an antenna which can easily adjust the resonance frequency after fabrication by solving this drawback.

[Means for solving the problem]

In the present invention, the radiation plate and the ground plane of the antenna are connected at the first and second connection portions, and the second connection portion is easily cut and divided into a plurality of conductors thin enough to be removed. first and second short sides of the approximately _^1/2 or more in the first and so the second connecting portion radiation plate width and a second sum of gap radiation plate width between the conductors of the connecting portion of the connecting portion It is characterized by being arranged above.

That is, the present invention provides a substantially rectangular radiating conductor plate to which a power supply terminal is connected, a grounding conductor plate substantially parallel to the radiating conductor plate, and a grounding conductor plate attached to the grounding conductor plate. In the antenna provided with the connection conductor portion connected to the side, at least a part of the connection conductor portion is formed of a plurality of narrow conductors arranged with a predetermined gap.

It is preferred that the sum of the width of the connecting conductor part is approximately _^1/2 or more the length of the short side of the radiating conductor plate.

Also, a dielectric may be disposed between the radiation conductor plate and the ground conductor plate, and the connection conductor may be a slow hole provided in the dielectric.

[Operation] After the antenna is manufactured, the resonance frequency can be easily adjusted by cutting and reducing the number of the thin conductors without any trouble such as changing the shape of the radiation plate.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. In FIG.
The first connecting portion 3 is an integral flat plate, and the second connecting portion 4
Is a plurality of thin strips. In the present embodiment, when the first connecting portion 3 a distance between the second plurality of outer end of the connecting portion 4 and W _2, first and second connecting portions interval W _2c is sufficiently than lambda / 2 when small, the antenna exhibits approximately the same characteristics as the antenna having a connection plate 6 having a width W ₂ shown in Figure 2. Second
An antenna having a radiation plate width W ₁ and a connection plate width W ₂ shown in FIG. ₂ having a relation of W ₁ > W ₂ has a property that when the connection plate width W ₂ is reduced, the resonance frequency decreases as shown in FIG. ing.

Here, reducing the connection plate width W ₂ generally antenna with an increase in reactance L, more best feed point S
Becomes smaller. However Experimentally, if the connection plate width W ₂ is approximately _^1/2 or more of the radiation plate width W _1, the change in the bandwidth due to the position change of the rise and the best feed point of the reactance L is not a practical problem.

Therefore, as shown in the first embodiment of FIG. 1, a connecting portion is formed of a first connecting portion using one conductor plate and a second connecting portion formed of a plurality of narrow strip-shaped conductor plates. With the connection portion, the adjustment of the resonance frequency after the antenna is manufactured can be easily performed by sequentially cutting and removing the outermost conductor from the second connection portion.

In the present antenna, as is clear from the above description, the smaller the gap between the plurality of conductor plates of the second connection portion is, the finer the resonance frequency can be adjusted. Therefore, in the present antenna, this gap is determined to an appropriate value in consideration of the bandwidth of the present antenna and the required bandwidth.

FIG. 4 is an external view and a partially enlarged view of a second embodiment of the present invention, in which the present antenna is configured on a housing of a portable wireless device. In FIG. 4, a casing 7 made of metal operates as a base plate. Reference numeral 8 denotes an auxiliary grounding conductor plate provided so that high-frequency contact between the housing 7 and the first connection portion 3 and the second connection portion 4 is improved. In this embodiment, the radiation plate 1, the first connection part 3, and the auxiliary grounding conductor plate 8 are formed of a single metal plate. Also, as shown in the partial enlarged view, the second connection portion is formed in a comb shape using a metal plate thinner (about 0.2 mm) than a metal plate forming a radiation plate or the like, and an auxiliary grounding conductor plate and a It is soldered to the bent part of the radiation plate. As described above, since the second connection portion is thin in this embodiment, it is extremely easy to cut and remove the second connection portion. The antenna of the present embodiment has a fractional bandwidth of 6 to 7%, and the resonance frequency can be adjusted by 3 to 4% at intervals of about 0.8%.

As in the present embodiment, since the resonance frequency of the antenna on the portable wireless device is affected by the shape of the housing and the surrounding parts and protrusions in addition to the dimensions of the antenna itself, the error is large relative to the design value. . Therefore, this embodiment is extremely effective in such an environment.

FIG. 5 is an external view of a third embodiment of the present invention constructed using a double-sided board. In FIG. 5, reference numeral 9 denotes a dielectric substrate, first and second connecting portion conductors are constituted by through holes, reference numeral 10 corresponds to a first connecting portion, and reference numeral 11 denotes a second connecting portion. Is equivalent to Adjustment of the resonance frequency is easily performed by removing the conductor portion of the through hole with a drill or the like.

[Effect of the invention]

As described above, the antenna of the present invention can adjust the resonance frequency without affecting the bandwidth of the antenna, and thus has an effect that the adjustment after the antenna is manufactured becomes easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of a first embodiment of the present invention. FIG. 2 is an explanatory view of the principle of the present invention. FIG. 3 is a resonance characteristic diagram of the antenna. FIG. 4 is an external view and a partially enlarged view of a second embodiment of the present invention. FIG. 5 is an external view of a third embodiment of the present invention. FIG. 6 is an external view of a conventional example. 1 ... radiation conductor plate, 2 ... ground conductor plate, 3 ... first connection conductor portion, 4 ... second connection conductor portion, 5 ... power supply pin,
6 ... connecting conductor plate, 7 ... body of portable wireless device, 8 ...
... Auxiliary grounding conductor plate, 9 ... Dielectric substrate, 10 ... First connection conductor portion composed of through holes, 11 ... Second connection conductor portion composed of through holes, H ... Connection conductor Part height, S: position dimensions of the power supply terminal, W ₁ ... width of the radiation conductor plate, W ₂ ... width of the connection conductor portion or the connection conductor plate, W _2a , W _2b
... Width of first and second connection conductors, W _2c … .. Distance between first and second connection conductors.

Claims (3)

(57) [Scope of request for utility model registration] A radiating conductor plate having a substantially rectangular shape to which a power supply terminal is connected, a grounding conductor plate substantially parallel to and facing the radiating conductor plate, and a short side of the radiating conductor plate attached to the grounding conductor plate. An antenna comprising: a connecting conductor connected to a side; wherein the connecting conductor is at least partially formed of a plurality of narrow conductors arranged with a predetermined gap therebetween. 2. The antenna according the sum of the width of the connection conductor portions approximately _^1/2 or more in a utility model registration claims paragraph (1) of the length of the short side of the radiating conductor plate. 3. A utility model registration according to claim 1, wherein a dielectric is disposed between the radiation conductor plate and the ground conductor plate, and the connection conductor is a slow hole provided in the dielectric. Antenna.