JPS59169205A - Plane antenna - Google Patents

Abstract

PURPOSE:To simplify a printed pattern on a discharger substrate by feeding to the radiant element on a dielectric substrate by means of a primary radiator to radiate a plane wave in a single direction and therefore excluding a complicated feed circuit to the radiant element. CONSTITUTION:The radio wave sent from a conical horn 3 serving as a primary radiator is received by plate-shaped dipoles 4a and 4b, and a current flows to two lines 13 parallel to each other which are connected to a pair of feed terminals (a). This current is totally reflected at the short-circuited tip of the lines 13 and fed to the dipoles 4a and 4b in the form of a current having a 2betal4 phase delay to be radiated again (beta: transmission constant on the lines 13). The phase of the radio wave radiated again is decided by the length l4 of the lines 13. The same structure is given also to other plate-shaped dipoles. Thus the plane wave can be radiated toward an arrow A by deciding a proper length of the lines 13. In such a way, a complicated feed circuit can be excluded for each dipole. Thus, a printed pattern on a dielectric substrate 1 is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a planar antenna composed of a reflector and a dielectric substrate.

Note that for convenience of explanation, the number of elements of the array antenna is assumed to be nine.

A conventional planar antenna constructed from an array antenna has one surface of a single dielectric substrate serving as a ground conductor surface, and the other surface having a radiating element and a feeding circuit printed thereon. In this case, if the number of elements is increased in order to increase the gain of the antenna, the disadvantage is that the feeding circuit for each element becomes extremely complex.

In order to eliminate this drawback, the present invention uses a primary radiator to feed power to a radiating element on a dielectric substrate and radiate a plane wave in one direction. 1 and 2 are diagrams showing the structure of a planar antenna according to the present invention. In Figure 1 (1
) is a dielectric substrate, (2) is a reflector, (3) is a pyramidal horn which is a -order radiator, (4a) and (4b), (5
a) and (5b), (6a) and (6b), (
7a) and (7b), (8a) and (pb), (
9a) and (9b), (10a) and (10b),
(lla) and (llb), (12a) and (1
2 is a plate-shaped dipole printed on a dielectric substrate (1).

αto 1 is two parallel wires with short-circuited ends printed on a dielectric substrate (11).

Next, the plate dipoles (4a) and (4b) shown in FIG.
The operating principle will be explained using Radio waves from the pyramidal horn (3) are received by a plate dipole, and current flows through two parallel wires 031 connected to the power supply terminal pair A. This current is totally reflected at the short-circuited tips of two parallel wires [13] and has a phase delay of 9 lrL, 2
The current becomes β14 and the plate dipole (4a) and (4
b) is fed and re-radiated. However, β is parallel 2#!
is the propagation constant on a3. The phase of the re-radiated radio waves is determined by the line length 14 of the two parallel lines.

The same goes for other plate-shaped dipoles, so by appropriately determining the length of each two parallel lines, the re-radiated waves at each plate-shaped dipole can be made to have the same phase, and in the front direction of the antenna. A plane wave can be radiated in the direction of a certain arrow A.

This configuration has the advantage that a complicated power supply circuit to each plate-shaped dipole is not required, and the printed pattern on the dielectric substrate becomes simple.

FIG. 3 is a diagram showing another embodiment according to the present invention, which is a planar antenna that emits unidirectionally polarized waves, in which (1) is a dielectric substrate;
(2) is a reflector, (2 is a conical horn that emits circularly polarized waves, ■, (to), (c), ■, (5), 弼, □□□, ■,
C31) is a plate-like cross dipole.

Figure 4 is a detailed diagram of the structure of the plate-like cross dipole @.
(32a) and (3zb), (33a) and (3
3b) is a plate-shaped dipole printed on both sides of the dielectric substrate (1); ■, short-circuited by C371.The structure of other plate-shaped cross dipoles is also similar.In this case, as well as the planar antenna shown in Figs. 1 and 2, there is no need for a complicated feeding circuit A circularly polarized planar antenna with a simple printed pattern on the body substrate can be obtained.

In the above, a case has been described in which a plate-shaped dipole with a reflective plate thrown backward is used as a radiating element, but the present invention is not limited to this. All (
It can be implemented in the same way.

As explained above, the present invention has a great effect in that a thin planar antenna can be obtained with a simple structure.

[Brief explanation of drawings]

1 and 2 are structural diagrams of a planar antenna according to the present invention, and FIGS. 3 and 4 are structural diagrams showing other embodiments of the present invention. In the figure, (1) is a dielectric substrate, (3) is a pyramidal horn, and (4 is
a) and (4b), (32 and (32b) are plate dipoles, α31, C341, (c) are two parallel lines,
(c) is a conical horn, i is a plate-shaped cross dipole, (g)
, Gη are through-hole holes. It should be noted that the same or corresponding parts in FIG. 1 are denoted by the same reference numerals. Agent Makoto Kuzuno - Figure 2 t'5 3 Figure 2 and S4

Claims (1)

[Claims] In a planar antenna comprising a dielectric substrate on which a plurality of radiating elements are printed, and a reflector provided opposite to the dielectric substrate, the plurality of radiating elements are provided on one or both surfaces of the dielectric substrate. radiating elements, and two parallel wires with short-circuited ends connected to the feeding terminals of the plurality of radiating elements are printed, and a primary radiator is provided for feeding power to the plurality of radiating elements through space. A flat antenna featuring: