JPH03201604A - Radial line slot antenna - Google Patents

Abstract

PURPOSE:To use both horizontal polarization, which is linear polarization over a wide band, and vertical polarization and to obtain high gain performance by providing a slot group at a specified angle formed by a radius and a slot on plural circles equipped with specified radius to a wavelength at a radial waveguide. CONSTITUTION:A radial waveguide 4 is formed by a slot board 1 equipped with a lot of slots and a conductor faced to this slot board 1. At such a radial waveguide 4, when the wavelength is defined as lambdag, the center of the slot board 1 is arranged on the plural circles, which radius R is (c)+(n)Xlambdag [(n)=0.1, 2,...] and when an angle formed by the radius and the slot is defined as thetaand an angle formed by the radius and a Y axis is defined as phi, the slot group is provided under the condition of theta>=phi. Thus, the linear polarization (the horizontal polarization) can be obtained and since the slot group for the horizontal polarization and the slot group for the vertical polarization are made mutually orthogonally existent on the same slot board, the opening part of an antenna can be shared while making mutual interference extremely small.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a radial line slot antenna for linearly polarized waves using a radial waveguide used in the SHF and EHF bands.

[Conventional technology]

As a prior art, there is a technique disclosed in Japanese Patent Publication No. 1965-1983, for example. In other words, in a radial waveguide consisting of upper and lower disc-shaped conductors arranged oppositely at equal intervals, the wavelength of the propagation mode that spreads uniformly from the center in the radial direction with the same intensity, which is the most fundamental propagation mode, is λ. , then a first point on the radial axis of the upper conductor at a distance δ from its center, and a point 6+1/4 from the center on an axis perpendicular to this axis.
A second point located at a distance of ×λ, a third point located on the same axis as the first point and a distance of δ+1/2×λ from the center on the opposite side of the first point, and a second point A fourth point located on the same axis as the center and at a distance of δ+3/4×λ from the center to the opposite side of the second point;
A fifth point located on the same axis and in the same direction as the point and at a distance of δ+λ from the center.

A radiating element consisting of a pair of slots each arranged on an orthogonal line with a center spacing of 1/4 x λ is placed on one side of the slot on a spiral line passing sequentially through a school of fish determined in the same manner. This is a circularly polarized plane array antenna characterized in that the circularly polarized wave plane array antennas are sequentially arranged in a substantially V-shape with a tilt of about 45 degrees with respect to the radial direction.

(Problems to be Solved by the Invention) However, the above-mentioned conventional antenna is a single circularly polarized array antenna, and cannot handle linearly polarized waves as a radial line slot antenna. There is vertical polarization, and there was no radial line slot antenna that could handle both.

SUMMARY OF THE INVENTION An object of the present invention is to provide a linearly polarized radial line slot antenna that is capable of sharing horizontally polarized waves and vertically polarized waves and has a wide band.

[Means to solve the problem]

The present invention has been made to solve the above problems, and provides a radial line slot antenna in which a radial waveguide is formed by a slot plate having a large number of slots and a conductor facing the slot plate. When the wavelength at is λ, the radius R centered at the center of the slot plate is c+nXλ, (n=0.1.2
．． ), and where the angle between the radius and the slot is θ, and the angle between the radius and the Y axis is φ, it is characterized by having a group of slots where θ≧φ. This is a radial line slot antenna.

Also, when the wavelength in the radial waveguide is λ,
The radius R with the center of the slot plate as its center is d+nXλ
, (n=0.1.2....), when the angle between the radius and the slot is θ', and the angle between the radius and the X-axis is φ'. , θ'≧φ'.

If the angle between the radius of the slot plate and the slot is θ, then the number of slots where 0″ minus θ〈45″ is 45＠〈
It is characterized in that the number is greater than the number of slots where θ<90@.

When the wavelength in the radial waveguide is λ9.

The radius R with the center of the slot plate as its center is C+n×λ
* (n=o, 1.2...), and when the angle between the radius and the slot is θ, and the angle between the radius and the Y axis is φ, then θ A slot group with ≧φ and a radius R centered on the center of the slot plate are d+nXλ@ (rt-o.

1.2. ...), where the angle between the radius and the slot is θ', and the angle between the radius and the X-axis is φ°, a group of slots where θ"≧φ° , and both slot groups are in an orthogonal relationship.

It is characterized by having a group of slots perpendicular to a radius centered on the center of the slot plate.

[Effect]

The radial line slot antenna of the present invention is:

A linearly polarized wave (horizontal polarized wave) is obtained by a group of slots in the Y-axis direction formed on a plurality of circles with an interval of λ9. Furthermore, another linearly polarized wave (vertical polarized wave) can be obtained by a group of slots in the X-axis direction formed on a plurality of circles with an interval of λ.

Then, the angle between the radius of the slot plate and the slot is θ
Then, the number of slots where Oo〈θ〈45° is
By increasing the number of slots to 45a〈θ〉90@, the number of slots near the X-axis and Y-axis becomes denser, and the radiation from the slots parallel to the radial direction becomes smaller. compensation, the radiation at the aperture is uniform, and the efficiency of the antenna is improved.

In addition, by arranging the slot group for horizontal polarization and the slot group for vertical polarization perpendicular to each other on the same slot plate, mutual interference is minimized and the antenna aperture can be shared. Become.

〔Example〕

The present invention will be explained in detail using examples.

FIG. 1 is an explanatory diagram of a radial line slot antenna according to the present invention. In FIG. slot (2). In addition, (3) is a frame, which is made by drawing the peripheral edge of a metal disk.The slot plate (1) is joined to this peripheral edge, sealed with epoxy resin, etc., and a radial A waveguide (4) is formed. A power feeding section (5) is attached approximately to the center of the slot plate (1).

A partition plate (not shown) is arranged in the internal space formed by the slot plate (1) and the frame (3).

The radial waveguide (4) may be divided into an upper layer waveguide and a lower layer waveguide, and a folded portion of the waveguide may be formed at the outer periphery of the partition plate.

A radome (6) is attached above the slot plate (]) to prevent rain and the like from entering. The bottom of this radome (6) is made of slippery Teflon material to prevent snow from accumulating, and its periphery is covered with slot plates (1).
and the frame (3) and sealed. Moreover, between this radome (6) and the slot plate (1),
Spacer (7) made of styrofoam, etc. if necessary
may be laminated.

Next, the slot (
The arrangement pattern 2) will be explained.

As shown in FIG. 2, slot (2) consists of two slot groups. Specifically, a first circle whose center is the center O of the slot plate (1) and whose radius R is C, a second circle whose radius is C+λ, a third circle whose radius R is c+2×λ, and the following. A group of circles obtained in the same way, ie.

On multiple circles where R=c+nXλ, (n=o, l, 2...), when the angle between the radius and the slot is θ, and the angle between the radius and the Y axis is φ, θ≧ The horizontally polarized slot eave side formed by forming a large number of slots with φ and the radius R centered on the center 0 of the slot plate (1) are d(
In this example, the first degree circle is d=c+λ, /2, the second degree circle is d+λ, the third degree circle is d+2×λ, and the following circles are obtained in the same manner. group, i.e.
On multiple circles □ with R-d10n When θ.

Slots 11 (15) for vertical polarization, which are formed by forming a large number of slots with ≧φ', are formed on the same slot plate (<1). FIG. 2 shows an embodiment in which θ=φ, θ°=φ°, that is, slot group 04 for horizontal polarization parallel to the Y axis and slot group 0!9 for vertical polarization parallel to the X axis. It shows. Further, d may be arbitrary.

The slot length of the slot group (b) for horizontal polarization is set to a value that is optimal at the frequency f)l, and from this slot group 0Φ, the slot length is set at right angles to the slot at the center frequency f. A linearly polarized wave with an electric field is emitted. Also, the angle (acute angle) between the radius of the slot plate (1) and the slot.
Let θ be the number of slots where 0° and θ<45° are preferably greater than the number of slots where 45a and θ<90°. This allows the slots near the Y axis to be denser, and the slots parallel to the radial direction to
This is compensated for by the fact that the radiation from ω becomes smaller.

On the other hand, the slot length of slot group 09 for vertical polarization, which is orthogonal to slot group 04, is set to a value that is optimal at frequency fv, and this slot group 0!19
A linearly polarized wave with a center frequency fν and an electric field perpendicular to the slot is emitted from the slot. Also, as above, the angle (acute angle) between the radius of the slot plate (1) and the slot is θ
Then, the number of slots at 0°〈θ×45' is
It is desirable to increase the number of slots so that 45° < θ < 90°. This allows the slots near the X axis to be denser, and the radiation from the slots parallel to the radial direction to be smaller. Compensated.

By doing this, slot 07 perpendicular to the radius
), the radiation intensity from the aperture is uniform, and the efficiency of the antenna is improved.

In addition, the interval P between the slots formed on each circle is P≦
λ. /2 (λ is the spatial wavelength). As a result, the slots become denser near each axis, radio waves are emitted in the front direction, the grating lobe becomes smaller, and the gain can be improved.

In the case of a radial line slot antenna with the structure shown in Figure 1, in which radio waves propagate from the center to the periphery, the radiation of radio waves from the slot located farthest from the center is increased, and the terminal (10) is The efficiency of the antenna is higher if the amount of reflection is made as small as possible.Therefore, as shown in FIG. 2, it is preferable to provide a radiation slot 02) on the periphery of the slot plate perpendicular to the radius. Note that when this radiation slot is perpendicular to the radius, the radiation is greatest, but the angle at which the radiation slot intersects with the radius is not necessarily 90".
There's no need to do it.

FIG. 3 shows another embodiment, which has a slot group o4 for horizontally polarized waves and a slot group 05) for vertically polarized waves on a circular group similar to the above-described embodiment, and Slot group 0 for waves is a slot group in which θ>φ, where θ is the angle between the radius and the slot, and φ is the angle between the radius and the Y axis. slot group 0 is
When the angle between the radius and the slot is θ'', and the angle between the radius and the X-axis is φ', this is a group of slots where θ゛>φ''. That is, the slot group 0 for horizontal polarization is formed inclined at a predetermined angle with respect to the Y axis, and the slot group 09 for vertical polarization is formed inclined at a predetermined angle with respect to the X axis.

〔Effect of the invention〕

The radial line slot antenna of the present invention can share horizontal polarization and vertical polarization, which are linearly polarized waves, in a wide band, and can obtain high gain performance.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway explanatory diagram, FIG. 2 is an explanatory diagram of a slot pattern, and FIG.
The figure is an explanatory diagram of a slot pattern showing another embodiment. (1)...Slot plate (2)...Slot (3)...Frame (4)...Radial waveguide (5)...Power supply section (6)...Radome (7)... ...Space (10...Terminal 0'!J...Radiation slot 04...Horizontal polarization slot group 1...Vertical polarization slot group 0 (9...Slot parallel to the radius Q7) ...Slowat perpendicular to the radius Patent applicant Toppan Printing Co., Ltd. Representative Lead powder Wadogu Figure 2

Claims (5)

[Claims] (1) In a radial line slot antenna in which a radial waveguide is formed by a slot plate having a large number of slots and a conductor facing the slot plate, when the wavelength in the radial waveguide is λ_9, the center of the slot plate The radius R with its center at is c+n×λ_9 (n=0
, 1, 2, ...), and where θ is the angle between the radius and the slot, and φ is the angle between the radius and the Y axis, the slot is θ≧φ. A radial line slot antenna characterized by having a group. (2) In a radial line slot antenna in which a radial waveguide is formed by a slot plate having a large number of slots and a conductor facing the slot plate, when the wavelength in the radial waveguide is λ_9, the center of the slot plate The radius R with its center is d+n×λ_9 (n=0
, 1, 2, ...), and the angle between the radius and the slot is θ', and the angle between the radius and the X axis is φ', then θ'≧φ ' A radial line slot antenna characterized by having a slot group. (3) In a radial line slot antenna in which a radial waveguide is formed by a slot plate having a large number of slots and a conductor facing the slot plate, if the angle between the radius of the slot plate and the slot is θ, then 0°＜
The number of slots where θ<45° is 45°<θ<90
A radial line slot antenna characterized in that the number of slots is greater than the number of slots. (4) In a radial line slot antenna in which a radial waveguide is formed by a slot plate having a large number of slots and a conductor facing the slot plate, when the wavelength in the radial waveguide is λ_9, the center of the slot plate The radius R with its center at is c+n×λ_9 (n=0
, 1, 2, ...), and where θ is the angle between the radius and the slot, and φ is the angle between the radius and the Y axis, the slot is θ≧φ. group and the radius R with the center of the slot plate as its center is d+n×λ_9(n
=0,1,2,...) arranged on multiple circles,
When the angle between the radius and the slot is θ', and the angle between the radius and the X-axis is φ', there is a slot group where θ'≧φ', and both slot groups are orthogonal. A radial line slot antenna featuring (5) In a radial line slot antenna in which a radial waveguide is formed by a slot plate having a large number of slots and a conductor facing the slot plate, a group of slots perpendicular to a radius centered on the center of the slot plate. A radial line slot antenna characterized by having.