JPH05145327A - Microstrip antenna - Google Patents

Abstract

PURPOSE:To facilitate the manufacture by sending a signal through a microstrip line to a radiation element through electromagnetic coupling between a radiation element and a patch and allowing a wave to radiate from the element so as to eliminate the need for the connection of two dielectric plates with a feeding pin. CONSTITUTION:A rectangular non-conductor part 24 is formed to a ground conductor plate 22 on the front side of a dielectric plate 2 opposite to a radiation element 11 on a dielectric plate 1. A patch 23 whose length is smaller than a transmission wavelength is arranged in the non-conductor part 24 and connected to a microstrip line 21 with a feeding pin 25. Through the constitution above, the patch 23 is electromagnetically coupled with the radiation element 11 and the signal sent through the microstrip line 21 is efficiently fed to the radiation element 11 via the feeding pin 25 and the patch 23. Since the feeding pin 25 is inserted only to the one dielectric plate 2 or connected by a throughhole, manufacture is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microstrip antenna, and more particularly to a microstrip antenna used as a microwave array antenna.

[0002]

2. Description of the Related Art A microstrip antenna is a thin planar substrate made of a dielectric material having a low dielectric loss, and has a strip conductor circuit formed on its surface by using a printed wiring technique or the like. Since it is economical, small, and lightweight, it is widely used in the microwave band. Then, the microstrip antenna may be fed from the back surface of the dielectric material. This will be described with reference to the drawings.

FIG. 5 is an overall perspective view of a conventional microstrip antenna, and FIG. 6 is a sectional view taken along line VI-VI of FIG. In these figures, reference numeral 1 is a thin plate-shaped first dielectric plate on which a radiating element 11 is formed. Reference numeral 2 is a second dielectric plate having a ground conductor plate 22 formed on the entire front surface and a microstrip line 21 formed on the back surface. The radiating element 11 and the microstrip line 21 are connected to each other by a feeding pin 25 which is inserted through the first and second dielectric plates 1 and 2. The signal propagating on the microstrip line 21 is fed to the feeding pin 2
Power is supplied to the radiating element 11 via 5 and radiated.

[0004]

The above-described conventional microstrip antenna has a structure requiring a feed pin for connecting the radiating element and the microstrip line. Therefore, two feed pins are required. It is necessary to insert between the dielectric plates and connect them by soldering, or to form a three-layer plate through hole, which is difficult to manufacture,
There is a problem in that it becomes complicated and requires a large number of manufacturing steps. Also, when the radiating element is formed on the film sheet by forming the radiating element forming the radiating element and the structure is reinforced and held with foamed poly foam etc., it is not possible to solder the feed pin or form a through hole. Then, there was a problem that the power supply could not be practically performed.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a radiation pin and a microstrip line, which is a feeding line on the back side, with a feeding pin. An object of the present invention is to provide a microstrip antenna that saves time and effort for connection and facilitates manufacture.

[0006]

In order to achieve this object, a microstrip antenna according to the present invention has a thin first dielectric plate having a radiating element formed on the front surface and a microstrip line on the back surface. The second dielectric plate is formed, and a patch smaller than the transmission wavelength of a signal is disposed on the surface of the second dielectric plate so as to face the radiating element, and the patch and the microstrip. A power supply pin for connecting to the line is provided.

[0007]

In the present invention, the signal transmitted by the microstrip line is electromagnetically coupled to the radiating element and is transmitted to the radiating element to be radiated.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall appearance of a microstrip antenna according to the present invention and an overall configuration diagram in which two dielectric plates are separated, and FIG. 2 is a sectional view taken along line II-II in FIG. In these figures, the same components as those of the conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted. A feature of the present invention is that a rectangular non-conductor portion 24 is provided on the ground conductor plate 2 on the front surface side of the second dielectric plate 2 so as to face the radiating element 11 on the first dielectric plate 1. Is formed, a patch 23 smaller than the transmission wavelength is arranged in the non-conductor portion 24, and the patch 23 and the microstrip line 21 are connected by a power feeding pin 25.

With such a structure, the patch 23 can be electromagnetically coupled to the radiating element 11, and the signal transmitted through the microstrip line 21 is
The radiating element 1 is efficiently provided via the power feeding pin 25 and the patch 23.
Powered to 1. Then, the feeding pin 25 is inserted into only one dielectric plate, that is, the second dielectric plate 2, or
Since it is sufficient to connect through through holes, manufacturing becomes easy.

FIG. 3 is an overall external perspective view showing a second embodiment of the present invention, and FIG. 4 is a sectional view taken along line IV-IV in FIG. In the second embodiment, the first dielectric plate 1 in the first embodiment is composed of a film sheet 3 and a foamed polyfoam 4 that reinforces and holds the film sheet 3, and the radiating element 11 is provided on the film sheet 3. It is characterized in that it is formed. Also in this case, similarly to the first embodiment described above, the patch 23 can be electromagnetically coupled to the radiating element 11, and the signal transmitted through the microstrip line 21 is transmitted to the feeding pin 25 and the patch 23. Power is efficiently supplied to the radiating element 11 via the radiating element 11.

[0011]

As described above, according to the present invention, a patch smaller than the transmission wavelength of a signal is provided on the surface of the second dielectric plate so as to face the radiating element formed on the first dielectric plate. Since the patch and the microstrip line are connected to each other by the feeding pin, the patch and the radiating element can be electromagnetically coupled to each other, whereby the two dielectric plates can be connected to the through hole and the feeding pin. Since it is not necessary to connect with, there is an effect that manufacturing is easy. Further, since it is not necessary to connect the radiating element and the microstrip line with a through hole or a feeding pin, the radiating element can be formed on a relatively inexpensive film sheet to form a microstrip antenna. There is also an effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall appearance of a microstrip antenna according to the present invention and an overall configuration diagram in which two dielectric plates are separated.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an overall perspective view showing a second embodiment of the microstrip antenna according to the present invention.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an overall perspective view of a conventional microstrip antenna.

6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 1 First Dielectric Plate 2 Second Dielectric Plate 3 Film Sheet 4 Polyfoam Foam 11 Radiating Element 21 Microstrip Line 22 Grounding Conductor Plate 23 Patch 25 Feed Pin

Claims (1)

[Claims] 1. A first thin plate having a radiating element formed on the surface thereof.
And a second dielectric plate having a microstrip line formed on the back surface thereof. A patch smaller than the signal transmission wavelength on the surface of the second dielectric plate facing the radiating element. And a feed pin for connecting the patch to the microstrip line.