JPS6323402A - microstrip antenna - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a circularly polarized microstrip antenna.

[Conventional technology]

Figure 3 shows, for example, Goto "Gain of Microstrip Array Antenna", IEICE Technical Journal, A-P82-33 (19
82) is a diagram showing the conventional circularly polarized microstrip antenna shown in FIG. 3 (al is a top plan view of this conventional circularly polarized microstrip antenna;
FIG. 3('b) is a sectional view taken along line A--A in FIG. 3+a).

In the figure, above the grounding conductor 4 there is a flat dielectric 5 which is thinner than the wavelength, further above this dielectric 5 there is a fan-shaped radiation conductor 1, and the radiation conductor 1 and the grounding conductor 4 combine to dielectric Holding body 5. 2 provided on the fan-shaped radiation conductor 1
A power feed line 2°1°22 for supplying power to the radiation conductor 1 is attached to the two power feeding points 31°32, and is led out through the ground conductor 4.

Next, the operation will be explained.

Power is supplied to the power supply points 31 and 32 provided on the radiation conductor 1.
When power is supplied through the IA 21.22, radio waves are excited between the fan-shaped radiation conductor 1 and the ground conductor 4, and the radio waves are radiated into space from the edge portion of the fan-shaped radiation conductor 1.

[Problem that the invention seeks to solve]

In a conventional microstrip antenna like the one above,
The feeding points 31 and 32 that excite linearly polarized waves are located within one radiation conductor 1, and therefore, there is a problem in that the mutual coupling of the feeding lines 21 and 22 is large, and a design that takes mutual influence into consideration is required. Ta.

This invention was made to solve the above-mentioned problems, and the antenna part that excites one linearly polarized wave and the antenna part that excites the other linearly polarized wave can be designed independently. The purpose is to obtain a microstrip antenna.

[Means for solving problems]

The microstrip antenna according to the present invention includes a radiation conductor 1 and a plurality of fan-shaped radiation conductors 1) to 14 having an apex angle of 90 degrees.
and is installed so that the vertices of the plurality of radiation conductors 1) to 14 and the straight line part of one side of the radiation conductor plate coincide, and the straight part of the side of the radiation conductors 1) to 14 and the ground conductor 4 are are short-circuited by short-circuit conductors 61 and 62.

[Effect]

Feed line 2 is connected to the feed points 31 and 32 provided on the radiation conductor l.
1.22, the fan will radiate.

At this time, the straight portions of the sides of the plurality of radiating conductors are short-circuited conductors 61.
62 to the ground conductor 4, each radiating conductor 1). Each of the antennas 14 is independent, and an antenna with two orthogonal polarizations in multiple frequency bands can be realized.

[Embodiments of the invention]

FIG. 1 is a block diagram showing one embodiment of the present invention.
Figure (a) is a plan view of the microstrip antenna of the present invention viewed from above, and Figure 1 (bl is the line A-A in Figure 1).
FIG. In the figure, 21.31.32
．． 4.5 is the same component as the prior art shown in FIG.

Here, the radiating conductors 1 are two fan-shaped radiating conductors 1) with an apex angle of 90 degrees. 12, these two fan-shaped radiation conductors 1). 12 vertices coincide, and each radiation conductor 1
). 12 so that the straight line portions of one side coincide with each other, so that the whole becomes a semicircular radiation conductor.

There are also two radiating conductors 1). The straight line portion of side 12 is short-circuited to the ground conductor 4 using short-circuit conductor plates 61 and 62 as short-circuit conductors.

This short-circuiting conductor plate 61 is short-circuited along the straight line of the radiating conductor which has a semicircular shape as a whole among the straight line parts of the sides of the two radiating conductors 1)゜12. Conductor 1). The straight parts of the 12 sides are short-circuited to match each other.

Here is a fan-shaped radiation conductor 1). 12 are different in size, and a part of the short circuit conductor plate 62 is used in common.

If power is now supplied via the feed points 31, 32, the sector-shaped radiating conductor 1). Linearly polarized radio waves are radiated from the 12 circular arc portions. If the excitation phases of these linearly polarized waves are the same, they are spatially orthogonal, so they are orthogonal.
Polarized radio waves are emitted. In this case, the frequencies of the two linearly polarized waves are different. Now, a fan-shaped radiation conductor 1). 1
If the magnitudes of 2 are the same, two orthogonally polarized radio waves with the same frequency will be emitted. Fan-shaped radiation conductor 1). 12 are independent because they are shielded by the short-circuit conductor plate 62, and each can be designed independently. Furthermore, the electric field is forced to be zero at the positions of the short-circuit conductor plates 61 and 62, and therefore the influence of higher-order modes is small.

Next, a second embodiment of the present invention will be described.

FIG. 2 is a configuration diagram of the microstrip antenna according to the second embodiment, and FIG.
b) is a sectional view taken along the line A-A in FIG.

In this example, four radiation conductors 1) to 1 of different sizes are used.
4 are attached so that the straight line portions of one side of the radiation conductors 1) to 14 coincide with each other, and the apexes of each of the radiation conductors 1) to 14 coincide with each other, so that the overall shape is circular.

In addition, two short-circuit conductors 61 and 62 are connected to each radiation conductor 1) to
Two straight parts of the 14 sides are connected to the same short-circuit conductor plate 61.
When the linearly polarized waves at 62 are radiated, since they are spatially orthogonal, an antenna with two orthogonal polarized waves can be realized.

In this case, although the frequencies of these two linearly polarized waves are different, by making the fan-shaped radiation conductors 1) to 14 the same size, an antenna with two orthogonal polarized waves having the same frequency can be realized.

Note that although the embodiment has been described for the case of transmission, the present invention may also be applied to the case of reception. Further, in the embodiment, a case has been described in which a short-circuit conductor plate is used as the short-circuit conductor, but a plurality of short-circuit conductor bars may be used instead of the short-circuit conductor plate. Furthermore, the short-circuiting conductor bar may be realized by through-hole plating or the like.

〔Effect of the invention〕

As described above, according to the present invention, the radiating conductor has an apex angle of 9
Consisting of a plurality of fan-shaped radiating conductors at 0 degrees, and installed so that the vertices of the plurality of radiating conductors and the straight line parts of the sides of the radiating conductors coincide, and the straight parts of the sides of the radiating conductors and the ground conductor are short-circuited. Since the conductor is short-circuited, it is possible to realize an antenna with two orthogonal polarizations of one frequency or two frequency bands, and since each fan-shaped radiation conductor is independent, the design becomes easy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the invention, FIG. 2 is a block diagram showing another embodiment of the invention, and FIG. 3 is a diagram showing a conventional microstrip antenna. In the figure,
1.1) ~ 14 are wild motherless radiating conductors weak-line skewers, 21 ~ 2
4 is a power supply line, 31 to 34 are power supply points, 4 is a ground conductor, 5 is a dielectric, and 61 and 62 are short-circuit conductors (short-circuit conductor plates). In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Oiwa Masu Tijl (2 idiots) Figure 1 (a) ; ; Name of the invention Microstrip antenna 3, Person making the amendment Representative Moriya Shiki Mitsubishi Electric Corporation 5, Ability to provide a detailed explanation of the invention subject to the amendment +6゜6, Contents of the amendment, ( 1) In the specification, page 3, lines 13 and 14, and page 4, line 3, "fan-shaped" is corrected to "circular." (2) Page 4, line 1 of the same document, " (3) In the same book, page 4, line 20, the text "radiating conductor plate" is corrected to "radiating conductor." νSuhi

Claims (6)

[Claims] (1) In a microstrip antenna in which a flat dielectric thinner than the wavelength is sandwiched between a radiating conductor and a ground conductor, and a feed line is attached to supply power to a feed point on the radiating conductor, the radiating conductor is placed at the top of the antenna. It is composed of a plurality of fan-shaped parts with angles of 90 degrees, and is installed so that the vertices of the plurality of radiating conductors and the straight line part of one side of the radiating conductor coincide, and the straight part of the side of the radiating conductor and the grounding. A microstrip antenna characterized by short-circuiting a conductor with a short-circuit conductor. (2) The radiation conductor is composed of two fan-shaped conductors of different sizes, and the straight portions of the sides of the two fan-shaped radiation conductors that coincide with each other are short-circuited with the same short-circuit conductor. A microstrip antenna according to claim 1. (3) The above-mentioned radiating conductor is composed of four fan-shaped pieces of different sizes and one side of which coincides with each other, and the straight portions of the sides of two adjacent fan-shaped radiating conductors are short-circuited with the same short-circuiting conductor. A microstrip antenna according to claim 1, characterized in that: (4) The microstrip antenna according to any one of claims 1 to 3, wherein the short-circuit conductor is constituted by a short-circuit conductor plate extending along a straight line portion of a side of the radiation conductor. . (5) The microstrip antenna according to any one of claims 1 to 3, wherein the shorting conductor is composed of a plurality of shorting conductor bars. (6) According to any one of claims 1 to 5, wherein the plurality of fan-shaped radiating conductors are arranged so that the linearly polarized waves radiated from the radiating conductors are spatially orthogonal to each other. Microstrip antenna as described.