JP2850649B2 - Circularly polarized horn antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circularly polarized horn antenna, and more particularly, to a circularly polarized horn antenna for transmitting and receiving circularly polarized waves using a single-point feed type circularly polarized radiating element formed by a microstrip.

[0002]

2. Description of the Related Art FIG. 2 is a view showing an example of a conventional circularly polarized horn antenna of this type, and FIG.
(B) is a front view.

Here, a single-point feeding type circularly polarized radiating element 1 is provided inside a horn 2. The single-point feed circularly polarized wave radiating element 1 is formed of a microstrip, and transmits and receives circularly polarized waves through a feed line 11.

[0004]

In the above-described conventional circularly polarized horn antenna, a single-point feed type circularly polarized radiating element formed by a microstrip is used.
There is a problem that the axial ratio is narrow band and the cross polarization characteristics are not good.

An object of the present invention is to provide a circularly polarized horn antenna that can improve cross polarization characteristics.

[0006]

SUMMARY OF THE INVENTION A circularly polarized horn antenna according to the present invention is formed by microstrips and degenerately separated.
And one point feeding type circular polarized wave radiation element you receive a circularly polarized wave having an element portion, degeneracy separation before Symbol one point feeding type circular polarized wave radiation element
A first feed line connected from the element portion at the position of 45 ° in the counterclockwise direction, before orthogonal to the feeding direction of the first feed line
From the degenerate separation element part of the single-point feed type circularly polarized radiating element
It comprises a second power supply line connected at a 45 ° counterclockwise position and an absorbing resistor connected to the end of the second power supply line.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the present invention, and the same parts as those in the conventional example shown in FIG.

As in FIG. 2, the single-point feed type circularly polarized radiating element 1 provided inside the horn 2 is formed of a microstrip, and receives a circularly polarized wave via a first feed line 11. Send and receive. Further, the second power supply line 12 is connected to the single-point feed type circularly polarized radiating element 1 from a direction orthogonal to the first power supply line 11, and is terminated by the absorption resistor 3.

In general, the degenerate separation element portion 1a of the single-point feed type circularly polarized radiating element 1 is located at 45 ° counterclockwise from the connection position of the feed line, and at 45 ° clockwise. In some cases, circularly polarized waves that rotate in opposite directions can be transmitted and received.

By the way, the degenerate separation element portion 1a is located at 45 ° clockwise with respect to the first feed line 11, and at 45 ° counterclockwise with respect to the second feed line 12. Therefore, the second feeder line 12 can receive a circularly polarized wave that rotates counter to the circularly polarized wave transmitted and received by the first feeder line 11.

Accordingly, a circularly polarized wave component that rotates backward with respect to the circularly polarized wave transmitted and received by the first feeder line 11 is transmitted to the second feeder line 12.
And can be attenuated by the absorption resistor 3.

[0013]

As described above, according to the present invention, the first power supply line and the second power supply line are connected at orthogonal positions, and the first power supply line transmits and receives circularly polarized waves.
By terminating the second feed line with an absorbing resistor, a circularly polarized component of the second feed line turning backward can be received and attenuated, so that the cross polarization discrimination can be improved. .

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a diagram showing an example of a conventional circularly polarized horn antenna, wherein (a) is a side view and (b) is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Single point feeding type circularly polarized radiating element 2 Horn 3 Absorption resistor 11, 12 Feeding line

Claims (1)

(57) [Claims] 1. A degenerate formed by a microstrip
And one point feeding type circular polarized wave radiation element that sends and receives circularly polarized waves having a separation element portion, degeneration of pre-SL single - feed type circular polarized wave radiation element
A first feed line connected at 45 ° counterclockwise from the separation element portion, and a degenerate separation element portion of the single-point feed type circularly polarized radiating element orthogonal to the feed direction of the first feed line .
A circularly polarized horn antenna, comprising: a second feed line connected at a position 45 ° clockwise from the first feed line; and an absorbing resistor connected to an end of the second feed line.