JPH0557682U - Transceiver - Google Patents

Abstract

(57) [Abstract] [Purpose] In a transceiver that shares light waves and radio waves,
(EN) A device in which a radio wave reception element, a transmission element, and a light wave detector can be separately arranged. [Structure] A radio wave receiving element and a transmitting element are separately arranged at positions facing each other, and a light wave detector is separately arranged from a radio wave receiving element and a transmission element, and a light wave reflecting mirror is provided. A radio wave reflector is concentrically separated into a circular parabolic surface and a ring-shaped parabolic surface, and the light wave and radio wave paths are separated by a separating plate. [Effect] A transmitter / receiver suitable for a radar can be obtained in which a transmitter element having a large isolation between transmitter and receiver and a high withstand power can be easily arranged.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a transmitting / receiving device that shares radio waves and light waves.

[0002]

[Prior Art]

 A transmitter / receiver that uses both radio waves from a radar and infrared rays radiated from a heating element has been known for a long time. It can be used widely and can be widely used. Conventionally, as an example of such a device, a device as shown in FIG. 3 has been proposed. In the figure, 1 is a radio wave detector, 3 is a transmitter, 6 is a separating plate, 7 is a circular parabolic reflector, 10 is a light wave detector, 11 is a signal processor, and 12 is a signal processor. As shown in FIG. 4, the detector 1 is composed of a receiving element 2 for receiving radio waves from the space and a transmitting element 5 for radiating the radio waves to the space. By separating the receiving element 2 and the transmitting element 5 in this way, a demultiplexer such as a circulator is not required, and thus the configuration of the device can be simplified. Further, as the receiving element 2 and the transmitting element 5, microstrip elements are often used, and the radio wave detector 1 can be miniaturized. By arranging a plurality of receiving elements 2 at a predetermined interval as shown in Fig. 4, monopulse reception becomes possible. Furthermore, a monopulse comparator, a mixer, etc. are integrated with the radio wave detector 1 to simplify the device and reduce the reception sensitivity. A method for improving the above is often used.

Next, the operation will be described. The radar signal generated by the transmitter 3 is sent to the transmitting element 5, and the radio wave emitted from the transmitting element 5 passes through the separating plate 6 and is reflected by the circular parabolic reflector 7 to be radiated into space. The reflected radio wave from the target passes through a route opposite to that at the time of transmission, is detected by the receiving element 2, is converted into an electric signal, and is sent to the signal processor 12. In addition, light waves such as infrared rays radiated from the target are reflected by the circular parabolic reflector 7 and then by the separating plate 6 as well, are focused and detected by the light wave detector 10, and are converted into electric signals. It is sent to the signal processor 11. As an example of the separating plate 6, if a dielectric multi-layer coating that reflects light waves in the wavelength band to be used is applied to a dielectric plate having a thickness of a half wavelength having a high radio wave transmittance or an integral multiple thereof, the coated surface will be Although it serves as a light wave reflector, it has little effect on the transmission of radio waves, so a flat or curved plate that can separate light waves and radio waves can be realized.

[0004]

[Problems to be solved by the device]

 Since the conventional transmitter / receiver is configured as described above, since the receiving element and the transmitting element are adjacent to each other, the isolation between the transmitting and receiving is poor, and increasing the transmission power adversely affects the receiving system. Sometimes. In other words, since a high-power signal is input to the receiving system, saturation of the mixer occurs, and reception is impossible until the mixer recovers from saturation to its normal state. For this reason, there is a problem when used as a pulse radar transceiver that alternately repeats transmission and reception. To prevent this, there is a method in which the receiving element and the transmitting element are shared and the circulator separates the transmission and reception. For example, a circulator in the millimeter wave band has poor isolation, a narrow frequency band used, and poor temperature characteristics. There are problems such as. If a microstrip element is used as the transmitting element, the element's withstand power is small and the transmission power cannot be sufficiently high. Instead, an element with high withstand power such as a horn antenna may be required. It becomes difficult to arrange because of conflict with.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to obtain a transmission / reception device in which a radio wave reception element, a transmission element, and a light wave detector can be separately arranged. To aim.

[0006]

[Means for Solving the Problems]

 In the transmitter / receiver according to the present invention, a radio wave reception element and a transmission element are separately arranged at opposite positions, and a light wave detector is separately arranged from the radio wave reception element and the transmission element. The light wave reflector and the radio wave reflector are concentrically separated into a circular parabola and a ring-shaped parabola, and the light wave and radio wave paths are separated by a separating plate.

[0007]

[Action]

 In the transmitting / receiving device according to the present invention, the radio wave emitted from the transmitting element is reflected by the sub-reflecting mirror, then reflected again by the ring-shaped parabolic reflecting mirror, and radiated to the target in space. The reflected radio wave from the target is reflected by the circular parabolic reflector and the ring-shaped parabolic reflector, passes through the separating plate, and is focused on the receiving element of the radio wave detector. In addition, the light wave radiated from the target is reflected by the circular parabolic reflector and then by the separation plate and focused on the light wave detector.

[0008]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a radio wave detector, 3 is a transmitter, 4 is a transmitting element, 6 is a separation plate, 7 is a circular parabolic reflector, 8 is a ring-shaped parabolic reflector, and 9 is a sub-reflection. A mirror 10, 10 is a light wave detector, 11 is a signal processor, 12 is a signal processor, and the radio wave detector 1 is provided with a receiving element 2 as shown in FIG.

Next, the operation will be described. In FIG. 1, the radio wave radiated from the transmitting element 4 is reflected by the sub-reflecting mirror 9 and then reflected again by the ring-shaped parabolic reflecting mirror 8 to be radiated into the space. The mirror surface shape of the sub-reflecting mirror 9 can be constituted by a spheroid or a hyperboloid. When viewed in cross section in any shape, one of the two focal points of the sub-reflecting mirror 9 is made to coincide with the focal point of the ring-shaped parabolic reflecting mirror 8, and the other focal point of the sub-reflecting mirror 9 and the transmitting element 4 are arranged. If the radiation phase centers of are matched, the wavefronts of the radio waves radiated from the ring-shaped parabolic reflector 8 into the space can be aligned. Since the transmitting element 4 is separated from the radio wave detector 1, even a physically large element can be easily arranged, and a horn antenna or the like having high power resistance can be used. Next, the reflected wave from the target is reflected by the circular parabolic reflector 7, passes through the separating plate 6, is focused on the radio wave detector 1, is converted into an electric signal, and is sent to the signal processor 12. .. The radio wave detector 1 operates as a normal parabolic antenna if it is placed at the focal point of the circular parabolic reflector 7. Since the radio wave detector 1 and the transmitting element 4 are both element antennas having a wide beam width, the electric power of the transmission wave received by the radio wave detector 1 is sufficiently small, and the isolation between transmission and reception is higher than that of the conventional device. Can be big. In addition, light waves such as infrared rays radiated from the target are reflected by the circular parabolic reflector 7 and then also reflected by the separation plate 6, focused on the light wave detector 10, converted into an electric signal, and converted into a signal processor 11. Sent to.

Although the case where the number of receiving elements is four has been described above assuming a monopulse radar, the number of receiving elements may be one.

[0011]

[Effect of the device]

 As described above, according to the present invention, a transmission / reception device suitable for radar can be obtained because the transmission / reception isolation is large and a transmission element having high power resistance can be easily arranged.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a transmission / reception device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a radio wave detector according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a conventional transmission / reception device.

FIG. 4 is a configuration diagram of a conventional radio wave detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio wave detector 2 Receiving element 3 Transmitter 4 Transmitting element 6 Separation plate 7 Circular parabolic reflector 8 Ring-shaped parabolic reflector 9 Subreflector 10 Light wave detector 11 Signal processor 12 Signal processor

Claims (1)

[Scope of utility model registration request] 1. A circular parabolic reflector that reflects radio waves and light waves, a ring-shaped parabolic reflector that is provided around the circular parabolic reflector and reflects radio waves, and the circular parabolic reflector. A transmitting element that is provided on the central axis of the mirror and radiates radio waves,
A sub-reflector that reflects the radio wave radiated from the transmitting element to the ring-shaped parabolic reflector, and receives the radio wave reflected from the circular parabolic reflector provided at the apex position of the sub-reflector. A radio wave detector with a receiving element for
A light wave detector provided at or near the apex position of the circular parabolic reflector for receiving light waves, a signal processor connected to both detectors, and a transmitter for transmitting radio waves to the transmitting element. And a separating plate which is provided between the circular parabolic reflector and the transmitting element, transmits a radio wave reflected from the circular parabolic reflector and reflects a light wave to focus the light wave detector. A transmission / reception device comprising: