JPH1098330A - Antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized antenna, corresponding to plural frequency bands and delectable polarization. SOLUTION: The antenna of a strip line type consists of dielectric layers 11a, 11b and 11c consisting of a ceramic sheet, a ground electrode layer 12 arranged at the upper layer of the dielectric layer 11a and provided with nearly the same area as the layer 11a, a first radial electrode layer 13 of nearly a square arranged at the upper layer of the dielectric layer 11b, a second radial electrode layer 14 arranged at the upper layer of the dielectric layer to be arranged at a position corresponding to a part where the layer 13 is not arranged, a through-hole 15 for feeding power formed from the rear surface of the layer A toward the first layer 13, in order to feed power to the first radial electrode layer 13, plural through-holes 16 for connecting the second radial electrode layer to the ground electrode layer, capacitor connecting parts 17a and 17b, projected and formed at the respective first and second radial electrode layers 13 and 14 in order to capacity-connect the first and second layers 13 and 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an antenna,
More specifically, the present invention relates to an antenna that supports a plurality of frequency bands and allows selection of polarization.

[0002]

2. Description of the Related Art A conventional antenna will be described with reference to FIGS. The antenna 100 shown in FIGS. 5 and 6 includes a substrate 101 made of a dielectric material, a radiation electrode 102 formed on one main surface of the substrate 101, and a ground electrode 103 formed on the other main surface of the substrate 101. Become. And the substrate 10
Power supply through-hole 10 at a position corresponding to one radiation electrode 102.
4 are provided. In the power supply through hole 104, the substrate 101 is penetrated from the other main surface side of the substrate 101,
Connector 105 for supplying power to radiation electrode 102
Is inserted. The connector 105 is electrically connected to the radiation electrode 102 by the solder 106a, and
a and the solder 106b are fixed to the substrate 101. The antenna 100 receives circularly polarized waves, and the radiation electrode 102 is provided with a degenerate separation section 102a as shown in FIG.

Next, the antenna 110 shown in FIGS.
Is composed of a substrate 111 made of a dielectric material, a radiation electrode 112 formed on one main surface of the substrate 111, and a ground electrode 113 formed on the other main surface of the substrate 111. Then, a power supply through-hole 114 is provided at a position corresponding to the radiation electrode 111 of the substrate 111. This feed through hole 1
A connector 115 for feeding power to the radiation electrode 112 is inserted into the substrate 14 so as to penetrate the substrate 111 from the other main surface side of the substrate 111. The connector 115 is electrically connected to the radiation electrode 112 by the solder 116a,
The substrate 111 is formed by the solder 116a and the solder 116b.
Fixed to The antenna 110 receives linearly polarized waves. Unlike the radiation electrode 102 of the antenna 100, the radiation electrode 112 is not provided with a degenerate separation section, as shown in FIG.

[0004]

However, the above-mentioned antennas of the prior art have different frequency bands to receive and different polarizations to receive. To simultaneously receive such separated frequency bands, two antennas are arranged side by side. An antenna that forms two radiation electrode patterns on one substrate and supplies power to each radiation electrode is used. The method is conceivable.

However, in either case, the two radiating electrodes corresponding to different frequency bands must be arranged with a sufficient interval so as not to interfere with each other. Each had to be provided with a power supply means such as a connector. This has hindered miniaturization of the antenna.

Accordingly, it is an object of the present invention to provide a miniaturized antenna that can handle a plurality of frequency bands and can select a polarization.

[0007]

In order to achieve the above object, the present invention provides a laminated antenna comprising a dielectric layer, a first radiation electrode layer, a second radiation electrode layer, and a ground electrode layer. Wherein a dielectric layer is formed between the first electrode layer, the second electrode layer, and the ground electrode layer, and the first radiation electrode layer is provided on the first radiation electrode layer and the second radiation electrode layer. A capacitive coupling portion for capacitively coupling the first and second radiation electrode layers, a power supply portion for supplying power to the first radiation electrode layer, and a through hole for conducting the second radiation electrode layer and the ground electrode layer. Features.

Accordingly, the first radiation electrode layer functions as an antenna corresponding to one frequency band, and the first radiation electrode layer and the second radiation electrode layer are capacitively coupled to form another strip line. That is, the antenna functions as an antenna corresponding to another frequency band. Therefore, an antenna corresponding to a plurality of frequency bands can be obtained with one block, and the power supply to the radiation electrode can be performed at only one power supply unit, thereby achieving downsizing.

Further, it is possible to adjust the capacitance value in the capacitive coupling portion and to select the polarization depending on the position where the capacitive coupling portion is arranged.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a strip line type antenna, which includes dielectric layers 11 a, 11 b, and 11 c formed of ceramic sheets and a dielectric layer 11.
a ground electrode layer 12 arranged on the upper layer of the dielectric layer 11a and having substantially the same area as the dielectric layer 11a; a first radiation electrode layer 13 of a substantially square shape arranged on the upper layer of the dielectric layer 11b;
c, a second radiation electrode layer 14 disposed substantially in an L-shape at a position corresponding to a portion where the first radiation electrode layer 13 is not disposed, and a dielectric for supplying power to the first radiation electrode layer. A power supply through-hole 15 formed from the back surface of the body layer 11a toward the first radiation electrode layer 13, a plurality of through-holes 16 for connecting the second radiation electrode layer to the ground electrode layer, and a first radiation electrode In order to capacitively couple the layer 13 and the second radiation electrode layer 14, the capacitive coupling portions 17a and 17b protrudingly formed on the first radiation electrode layer 13 and the second radiation electrode layer 14, respectively.
It is composed of

Although not shown, a connector is inserted into the power supply through hole 15 as a coaxial line for supplying power to the first radiation electrode layer 13, and the first radiation electrode layer 13 is connected to the connector by soldering. Are conducted and fixed.

The strip line type antenna 1 configured as described above is capacitively coupled between the first radiation electrode layer 13 and the second radiation electrode layer 14 by the capacitive coupling portions 17a and 17b. Therefore, the first radiation electrode layer 13 portion functions as an antenna corresponding to one frequency band (high frequency side), and the other radiation band including the first radiation electrode layer 13 and the second radiation electrode layer 14 as a whole has a different frequency band. (Low frequency side)
It functions as an antenna corresponding to.

Next, an antenna 20 according to a second embodiment of the present invention will be described with reference to FIG. In the antenna 20, the same components as those of the antenna 1 shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The antenna 20 is different from the antenna 1 in that a substantially rectangular second radiation electrode layer 22, 23 is provided at a portion corresponding to a position surrounding all four sides of the first radiation electrode layer 13 formed in a substantially square shape. , 24, 25, and capacitive coupling portions 17a, 17b, 17c, for capacitively coupling the first radiation electrode layer 13 and the second radiation electrode layers 22, 23, 24, 25.
17d is located here.

The antenna 20 includes a first radiation electrode layer 13
In one frequency band, the first radiation electrode layer 13 and the second
In the other one frequency band by the radiation electrode layers 22 and 23, the first
The radiation electrode layer 13 and the second radiation electrode layers 24 and 25 function as a microstrip antenna corresponding to another frequency band.

Although not shown, this antenna 2
0, the second radiation electrode layers 22 and 23 may be combined to form a substantially L-shape as in the antenna 1 shown in the first embodiment. They may be combined to form a substantially L-shape.

Although not shown, the second radiating electrode layer 14 of the antenna 1 may be formed into a substantially rectangular shape in the same manner as the antenna 20.

In the antennas described in the first and second embodiments, the first radiation electrode layer and the second radiation electrode layer are capacitively coupled by the capacitive coupling portion. By shifting the position or trimming the capacitive coupling section, the frequency band on the low frequency side to be received can be easily adjusted, and the polarization on the low frequency side to be received can be selected.

Further, since the capacitive coupling portion is a laminated type and does not require a special manufacturing process, it is easy to form, and the thickness is small, so that the antenna can be reduced in height.

The first radiation electrode layer 13 described in each embodiment has a shape having a contraction separating portion 13a as shown in FIG. Can also be selected. Note that, in FIG. 4, the components other than the contracted body separation portion 13a are the same as those of the microstrip antenna 1 shown in the first embodiment.
The same reference numerals are given and the description is omitted.

As described above, according to the antenna of the present invention, the polarization can be set in the first radiation electrode layer corresponding to one frequency band (high frequency side), and can be set in the other frequency band (low frequency side). Polarization can be selected in the whole including the corresponding first and second radiation electrode layers.

In the first and second embodiments described above, the first radiation electrode has a substantially square shape, but may have a substantially circular shape.

In the above embodiment, the second radiation electrode layer and the ground electrode layer are connected by a plurality of through holes.
If the second radiation electrode layer is grounded at a high frequency, the number of through holes can be appropriately selected and determined.

In the above embodiment, the dielectric layer is formed using a ceramic sheet. However, the lowermost ceramic sheet may be an alumina substrate, an aluminum nitride substrate, or the like.

The antenna of the present invention is obtained by laminating a plurality of ceramic sheets and a plurality of electrode layers and then firing them. By forming the electrode pattern described above, firing and then cutting the antenna pattern, a large number of antennas can be manufactured at one time, so that the cost can be reduced.

The antenna according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the invention.

[0027]

As described above, in the microstrip type antenna according to the present invention, the first radiation electrode layer acts as an antenna corresponding to one frequency band, and
The first radiation electrode and the second radiation electrode are capacitively coupled to form another microstrip line, which functions as an antenna corresponding to another frequency band. Therefore, a plurality of microstrip lines are provided on one substrate. The antenna corresponding to the above frequency band can be obtained, and the power supply to the radiation electrode can be performed by only one power supply unit.

Further, it is possible to adjust the capacitance value of the capacitive coupling portion and to select the polarization depending on the position where the capacitive coupling portion is arranged.

[Brief description of the drawings]

FIG. 1 is a plan view showing a structure of a microstrip antenna according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the structure of the microstrip antenna according to the first embodiment of the present invention.

FIG. 3 is a plan view showing a structure of a microstrip antenna according to a second embodiment of the present invention.

FIG. 4 is a plan view showing a structure in which a contraction separation section is provided in a first radiation electrode portion in the microstrip antenna of the present invention.

FIG. 5 is a plan view showing a structure of a conventional microstrip antenna.

6 is a sectional view taken along line BB in FIG.

FIG. 7 is a plan view showing a structure of a conventional microstrip antenna.

FIG. 8 is a sectional view taken along line CC in FIG. 7;

[Explanation of symbols]

 1,20 microstrip antenna 11a, 11b, 11c dielectric layer 12 ground electrode 13, first radiation electrode 14,22,23,24,25 second radiation electrode 15 feed through hole 16 through hole 17a, 17b, 17c, 17d capacitive coupling part

Claims (1)

[Claims] 1. A stacked antenna comprising a dielectric layer, a first radiating electrode layer, a second radiating electrode layer, and a ground electrode layer, wherein the first radiating electrode layer and the second radiating electrode are arranged. The dielectric layer is formed between the first radiation electrode layer and the second radiation electrode layer, and the dielectric layer is formed between the first radiation electrode layer and the second radiation electrode layer. A capacitive coupling portion that capacitively couples the first and second layers, a power supply portion for supplying power to the first radiation electrode layer, and a through-hole for conducting the second radiation electrode layer and the ground electrode layer. Features antenna.