JPH0548324A - Double loading transmission/reception antenna - Google Patents

Abstract

PURPOSE:To attain the double loading transmission/reception antenna using one set of antenna in common by forming radiation elements of the microstrip antenna to be a square and providing a feeding port almost in the middle of two adjacent sides. CONSTITUTION:The double loading transmission/reception antenna 10 is a plane antenna employing a microstrip element. The length of sides A, B of a radiation element 11 of the microstrip antenna is selected to be nearly a half of an in- board wavelength lambdag of a transmission/reception signal, a feeding port P2 is provided almost in the middle of a side opposite to the side A of the element 11 and a feeding port P1 is provided almost in the middle of a side opposite to the side B of the element 11. The antenna 10 acts equivalently like two plane antennas employing microstrip elements whose polarized plane differ from each other by 90 deg.. The isolation between the polarized waves is 20dB or over, the gain is entirely equal to the case with one feeding port, and the antenna acting like two plane antennas is applied to a radio altimeter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual equipment transmitting / receiving antenna in which one set of antennas is shared by two sets of transceivers, and more particularly to a dual equipment transmitting / receiving antenna composed of a microstrip antenna.

[0002]

2. Description of the Related Art Conventionally, radio altimeters are mainly mounted on missiles, aircrafts, etc., but those mounted on aircrafts are often equipped with multiple equipment for the purpose of improving reliability. As shown in FIG. 4, an example of multiple equipment is that the transceiver 1 is equipped with a transmitting antenna 3 and a receiving antenna 4, and the transceiver 2
A transmitting antenna 5 and a receiving antenna 6 are installed in the. However, for example, when the equipment space is restricted as in a military aircraft, one transmitter antenna 3 is shared by mixing the transmitter signals of the two transceivers 1 and 2 in a combiner 7 as shown in FIG. The reception antenna 4 is shared by dividing the reception signal from one reception antenna 4 by the power divider 8 and supplying it to the transceivers 1 and 2.

[0003]

However, in the above-described antenna sharing method, the transmission output of each transceiver is quadrupled or the reception sensitivity is quadrupled due to the loss generated in the power divider and the power combiner. There was a problem that it was necessary to do. In addition, when this type of device is applied to a radio altimeter, if the existing transceiver is used without modification, the maximum measured altitude will drop to half due to the aforementioned loss.

It is an object of the present invention to provide a dual-equipment transmitting / receiving antenna capable of being dual-equipment that shares one set of antennas without compromising the system performance when used in an altimeter, for example. And

[0005]

In the dual-equipped transmitting / receiving antenna of the present invention, the radiating element of the microstrip antenna is formed in a square shape, and the feeding ports are respectively provided at substantially central portions of two adjacent sides of the square. It is characterized by being provided.

[0006]

According to the dual equipment transmitting / receiving antenna of the present invention,
A radiation element of the microstrip antenna is formed in a square shape, and an operation equivalent to two planar antennas, that is, a planar antenna in which a feeding port is provided at a substantially central portion of one side and a planar antenna obtained by rotating the planar antenna by 90 degrees, is performed. Then 2
It is possible to provide multiplexing equipment that shares one set of antennas with a set of transceivers.

[0007]

EXAMPLES The present invention will be described below with reference to examples.

FIG. 1 is a plan view showing the structure of an embodiment of the present invention.

Dual equipment transmission / reception antenna 10 of this embodiment
Is a planar antenna using a microstrip element, in which the radiation element 11 of the microstrip antenna is square, and the sides A and B forming the radiation element 11 of the microstrip antenna are both the wavelength λg in the substrate of the transmission / reception signal. Of the radiating element 11 of the microstrip antenna, and the feeding port P2 is provided substantially in the center of the side facing the side A of the radiating element 11 of the microstrip antenna, and faces the side B of the radiating element 11 of the microstrip antenna. A power supply port P1 is provided at a substantially central portion of the side.

The dual-equipment transmitting / receiving antenna 10 according to the embodiment of the present invention configured as described above is provided with two feeding ports P1 and P2, so that the plane of polarization differs by 90 degrees. ) And (b) operate equivalently to two planar antennas using the microstrip elements. Also, in the radio altimeter system, the direction of the plane of polarization does not matter in design.

In this case, it is known that the isolation between the respective polarized waves is 20 dB or more, and the gain is theoretically no different from the case where the power is fed through the one feed port. Therefore, the antenna of the present embodiment takes advantage of this characteristic of the planar antenna, and in terms of equipment, adopts a type that shares one set of antennas as in the case of FIG. 5, and is characteristically equivalent to the system of FIG. Becomes

Next, an example of a practical antenna in which the antenna of this embodiment is applied to a fighter will be described.

FIG. 3 is a plan view and a sectional view taken along line DD of a practical antenna in which the antenna of this embodiment is applied to a fighter.

This practical antenna is a dual equipment transmitting / receiving antenna 10 similar to that shown in FIG. 1 on a printed circuit board 13.
A and 10B are formed as a two-element antenna array, and a power feeding port P1 of the dual-equipped transmission / reception antenna 10A
And the power feed port P1 of the dual equipment transmission / reception antenna 10B are commonly connected, and the dual equipment transmission / reception antenna 10A is connected.
Power supply port P2 and the power supply port P2 of the dual-equipment transmission / reception antenna 10B are commonly connected, and the high-frequency connector 1 attached to the housing 14 at the power supply ports P1 and P2.
The central conductors 6 and 17 are connected to each other, and the printed circuit board 13 on which the antenna array is formed is mounted in the recess 15 formed in the center of the housing 14.

In the above practical antenna example, a two-element antenna array is used to increase the gain. However, when further gain is required, the array is formed by four or more elements. You may.

[0016]

As described above, according to the dual-equipment transmitting / receiving antenna of the present invention, the multiplexing equipment in which two sets of transceivers share one set of antennas without using a power combiner, a power divider, or the like. There is an effect that can be done. In addition, multiplexing equipment can be provided without compromising the performance of the radio altimeter system, and the effect of not lowering the maximum measured altitude can be obtained. Furthermore, since the polarization planes are different from each other, there is an effect that isolation between the transmitter and the receiver is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing the structure of an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining the operation of one embodiment of the present invention.

FIG. 3 is a plan view and a cross-sectional view showing a configuration of a practical example using one embodiment of the present invention.

FIG. 4 is a block diagram showing conventional multiple equipment.

FIG. 5 is a block diagram showing another conventional multiple equipment.

[Explanation of symbols]

 10, 10A, 10B ... Dual transmission / reception antenna 11 ... Microstrip antenna radiating element 13 ... Printed circuit board 16, 17 ... High frequency connector P1, P2 ... Feeding port

Claims (1)

[Claims] 1. A dual-equipped transmitting / receiving antenna, characterized in that a radiating element of a microstrip antenna is formed in a square shape, and a feeding port is provided substantially at the center of two adjacent sides of the square.