JPS63139406A - Slot antenna for circularly polarized wave - Google Patents

Abstract

PURPOSE:To facilitate an impedance matching and to improve a circularly polarized wave ratio ranging to a wide angle providing plural slots to make a phase center into the same to be provided at a ground conductor at an equal interval of 90 deg., plural feeding lines and a feeding circuit to execute the equal amplitude 90 deg. phase difference feeding to the slot through the feeding lines. CONSTITUTION:An orthogonal slot 1 is provided by crossing itself to a ground conductor 5, and feeding lines 2 and 3, and a feeding circuit 4 are provided through a dielectric 19 to the other surface side of the ground conductor 5. By executing an equal amplitude 90 deg. phase difference feeding with the feeding lines 2 and 3 and the feeding circuit 4 to a slot 1a of the longitudinal direction of the orthogonal slot 1 and a slot 1b of the lateral direction, the circularly polarized wave is obtained. Thus, by feeding through respective individual feeding lines to plural slots provided at the ground conductor, the matching of the impedance is facilitated. Since plural slots makes the phase center into the same, the circularly polarized wave ratio can be improved ranging to a wide angle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circularly polarized slot antenna that is a component antenna of an array antenna used in a frequency band higher than an ultra-high frequency.

[Conventional technology]

A conventional circularly polarized slot antenna, as shown in FIG.
By generating a horizontal electric field and changing the position of the power supply line 22 that feeds each of them, a phase difference is given and circularly polarized waves are generated. In addition, in FIG. 4, reference number 5 is a ground conductor.

[Problem that the invention seeks to solve]

In the conventional circularly polarized slot antenna described above, impedance matching is difficult because power is fed to the strip dipole antenna and the slot antenna through the same feed line. Furthermore, since the phase centers of the strip dipole antenna and the slot antenna are shifted, circular polarization cannot be improved over a wide angular range.

[Means for solving problems]

The circularly polarized slot antenna of the present invention includes a plurality of slots having the same phase center and provided at equal intervals of 90 degrees on a ground conductor, a plurality of feed lines corresponding to the slots, and a plurality of feed lines that are connected to the slots through the feed lines. and a power supply circuit that performs power supply with an amplitude of 90° phase difference.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIGS. 1 and 2, which show a circularly polarized slot antenna according to a first embodiment of the present invention, reference numeral 1 designates orthogonal slots cut into a ground conductor 5 in the form of a cross.

2.3 is a power supply line, 4 is a power supply circuit, and a ground conductor 5
It is provided on the other side with a dielectric 19 interposed therebetween. Equal amplitude 9 is provided by the power supply line 2.3 and the power supply circuit 4 in the vertical slot 1a and the horizontal slot 1b of the orthogonal slot l.
Circularly polarized waves are obtained by performing 0° phase difference power feeding.

3 and 4 show a circularly polarized slot antenna according to a second embodiment of the present invention, in which the phase center is fixed to the ground conductor 5 and 9
Slots 6.7 and 8.9 formed at equal intervals of 0°, and power supply lines 10.11 that individually correspond to these slots.
, 12.13, and power supply circuits 14, 15.16.

In this configuration, circularly polarized waves are obtained by feeding equal amplitude and 90° phase difference from the feeding circuits 14, 15.16 to the slots 6.7.8.9. Note that in FIGS. 3 and 4, reference numeral 19 indicates a dielectric material.

In the first and second embodiments described above, a configuration is adopted in which the dielectric 19 is divided into two horizontally in cross section, a support rod is interposed, and a gap is provided between the slot, the power supply line, and the power supply circuit, and the layers are stacked. It's okay.

〔Effect of the invention〕

As described above, according to the present invention, impedance matching can be easily achieved by feeding power to a plurality of slots provided in a ground conductor through separate power supply lines. Furthermore, since the plurality of slots have the same phase center, it is possible to improve the circular polarization over a wide angle.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing a first embodiment of the present invention, FIGS. 3 and 4 are block diagrams showing a second embodiment of the present invention, and FIG. 5 is a block diagram showing a conventional circular deflection. FIG. 2 is a configuration diagram showing an example of a wave slot antenna. 1, 1a, 1b, 6-9-slot,
2,3゜lO~13...Power supply line, 4.14~16
...Power supply circuit, 5...Ground conductor, 19...Dielectric material. Kaya 1 Figure 3 Kaya 50

Claims (1)

[Claims] A plurality of slots having the same phase center and provided at equal intervals of 90 degrees on a ground conductor, a plurality of power supply lines individually corresponding to the slots, and a power supply supplying power to the slots with an equal amplitude and a phase difference of 90 degrees through the power supply lines. A circularly polarized slot antenna comprising a circuit.