JPS6038884B2 - Electromagnetic wave synthesizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic wave combining device used for coupling two or more transmitters of different frequencies to a common antenna in a microwave communication line or the like.

A conventional device of this kind, as shown in FIG. The second boat P2 is the other signal input terminal to which a second transmitter (not shown) of frequency 2 is connected, and the third boat P3 is the common antenna. (not shown) was used as a signal output terminal for connection.

However, since such an electromagnetic wave synthesizer uses a frequency selection circuit (bandpass wave generator 2), there is a drawback that phase distortion and amplitude distortion occur due to its transmission characteristics.

Furthermore, when changing the transmission frequency, there is a drawback that the resonant frequency of the bandpass wave generator must be adjusted each time. SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic wave synthesis device that has low power loss and hardly produces phase distortion or amplitude distortion.

Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a first embodiment of the present invention. The electromagnetic wave synthesizer of this embodiment has a non-reflective input end (an input end that allows incident waves to pass through with almost no loss) and a reflective input end (an input end that allows incident waves to pass through almost without loss) between the first boat P and the circulator 1. A non-reciprocal circuit 3 made of a reflective unidirectional tube with an input end for reflection) is connected with its non-reflection input end facing the first boat P, and its reflection input end facing the circulator 1. This is what I did. In such an electromagnetic wave synthesizer, the first boat P has a frequency . The second port P2 has one signal input terminal to which a transmitter (not shown) is connected, and the second port P2 is the other signal input terminal to which a second transmitter (not shown) with a frequency of 2 is connected.
The third port P3 is used as a signal output terminal to which a common antenna (not shown) is connected. The irreversible circuit 3 made of a reflective unidirectional tube is
and the fourth boat P installed between the
The incident wave from P 4 is almost completely reflected and
, has transmission characteristics that allow it to be transmitted to the fourth boat P4 with almost no loss. Since this device has the above configuration, the frequency signal from the second transmitter is
The output is transmitted from the second boat P2 to the fourth boat P4, but it is completely reflected by the irreversible circuit 3 made of a reflective unidirectional tube, and then passes through the fourth boat P4 again to the third boat P3. The signal is then transmitted to the antenna. On the other hand, the frequency output from the first transmitter passes through the irreversible circuit 3 made of a reflective unidirectional tube with almost no loss, and is transmitted to the antenna via the fourth boat P4 and the third boat P3. will be done. FIG. 3 shows a specific example of the irreversible circuit 3 made of a reflective unidirectional tube.

This irreversible circuit 3 has a rectangular shape TE. A plate-shaped ferrite 5 with a thickness d is inserted into the waveguide 4 close to one narrow surface, and a DC magnetic field Ho is applied perpendicularly to the wide surface of the waveguide 4 from bottom to top. Now, if a traveling wave traveling toward the plane of the paper is applied to this waveguide 4, a positive circularly polarized wave is generated in the ferrite 5 portion, and the magnetic permeability of this portion operates as a positive magnetic permeability Buddha +. On the other hand, when a retrograde liquid is added that moves forward from the plane of the paper, negative circularly polarized waves are generated in the ferrite 5 portion, and the magnetic permeability operates as a mu. On the other hand, the value of this positive or negative magnetic permeability mountain changes as shown in Figure 4 depending on the strength of the DC magnetic field. If you choose a negative point, the radio wave will not enter the ferrite 5, and the electric field distribution will become like the solid line (traveling wave) A in Figure 3, and equivalently the width of the waveguide 4 will be a. This means that it has been shortened to . Therefore, if waves of a frequency lower than the cutoff frequency 〆cF determined by this are used, all of these waves will be reflected. In comparison, the magnetic permeability for waves in the opposite direction is a positive value, and the relative permittivity z of ferrite 5 is a large value, so the electric field is concentrated in that part, and the broken line in Figure 3 (reverse wave) becomes like a mouth, and its cutoff frequency 〆cc
is lower than when ferrite 5 is not inserted.

According to the above principle, if a frequency lower than the aforementioned cutoff frequency 〆cF is selected within the operating band of the waveguide 4 as the operating frequency, the incident wave from one boat will be completely reflected, and the incident wave from the other boat will be almost completely reflected. This makes it possible to realize a reflective unidirectional tube, which is a non-reciprocal circuit 3 that has the characteristic of transmitting data without loss.

FIG. 5 shows a second embodiment of the invention.

The electromagnetic wave synthesizer of this embodiment uses a circulator with four ports to synthesize three types of input signals having different frequencies, ie, , na2, and na3. FIG. 6 shows a third embodiment of the present invention.

The electromagnetic wave synthesizer of this embodiment is another example in which the structures shown in FIG. As explained above, the electromagnetic wave synthesizer according to the present invention includes a circulator and a transmission characteristic that allows most of the incident waves from one side to be reflected and the incident waves from the other side to pass through with almost no loss. Since it is formed by combining a non-reciprocal circuit with It is very useful when used in ultra-multiplex microwave lines, etc.Also, when the transmission frequency is changed from time to time, such as in a satellite communication ground station, there is no need for frequency adjustment, and there is no power loss. There are very few advantages.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram of a conventional electromagnetic wave synthesizer, Figure 2 is a wiring diagram showing a first embodiment of the electromagnetic wave synthesizer according to the present invention, and Figures 3 and 4 are of a nonreciprocal circuit used in the present invention. Cross-sectional view and characteristic diagram of magnetic permeability against changes in magnetic field, Figures 5 and 6
The figure is a wiring diagram of second and third embodiments of the electromagnetic wave synthesis device according to the present invention. 1...Circulator, 3...Irreversible circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. One port of a circulator having a plurality of ports is used as one signal input end, and most of the incident waves from one (reflection input end) are reflected to the next port in the rotational direction, and the waves are reflected from the other (reflection input end). The reflective input end of a non-reciprocal circuit having transmission characteristics that allows the incident wave from the non-reflective input end to pass through with almost no loss is connected, and the non-reflective input end of the non-reciprocal circuit is used as another signal input end. Characteristic electromagnetic wave synthesis device. 2. The electromagnetic wave synthesis device according to claim 1, wherein a reflective unidirectional tube is used as the irreversible circuit.