JPS60232701A - Circulator - Google Patents

Abstract

PURPOSE:To simplify the constitution of the titled device and to reduce its size by using a three-terminal distributor for any one of a four-terminal in-phase/ reverse phase 3dB distributor or a four-terminal pi/2.3dB distributor. CONSTITUTION:A modulated T-branch 12 is used as the three-terminal distributor, and in addition, a pi/2 non-reversible phase shifter 4, a short slit hybrid 5 and an H-bend WG6 are arranged. An input signal from a terminal 13 is distributed into 3dB signals respectively at points (b), (b') and signals distributed in each 3dB in the same phase at points (a), (a') are outputted from a terminal 14. An input signal from the terminal is distributed in each 3dB in the same phase at the points (a), (a'), completely reflected at the T-branch 12, synthesized, and then outputted to the terminal 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave band waveguide type high power circulator.

The power consumption of a circulator used in a high power amplifier for obtaining high output of a satellite communication device is on the order of several kilowatts. For this reason, Y-junction circulators for small power applications cannot be used in terms of power resistance and heat generation because the electric field is too concentrated in the ferrite in the center. Conventional circulators for high power applications are as shown in Figure 1. Deformation magic Tl, with ferrite 2 inside the waveguide and a magnet 3 for DC field adjustment built into the outside of the waveguide.
It is composed of an irreversible phase shifter 4, a short slot hybrid 5, and an H-pend WG6. In FIG. 1, the Modified Magic TI is used as a 4-terminal in-phase and anti-phase 3 dB distributor, and the Short Slot Hybrid 2 is used as a 4-terminal -3 dB distributor.

In addition, as shown in FIG. 3, two modified magic TI's are used, and a configuration consisting of an irreversible phase shifter 4 and a reversible phase shifter 2 and an incest 7 will be used and discussed.

Figure 3 shows one modified magic T with 4 terminals in-phase and anti-phase 3dB.
This is used as a divider, and a combination of the other modified magic T and i reversible phase shifter is used as a 4-terminal -3 dB divider.

When using the circulator shown in FIGS. 1 and 3 as an isolator, the extra terminals of the four-terminal circulator 8 must be terminated with dummy loads 9 and 10, respectively, as shown in FIG. Also, when using the 4-terminal circulator 8 as a duplexer with a bandpass F wave filter 11 connected to one terminal as shown in FIG. 6, the extra terminal must be terminated with the dummy load 9. It won't happen. Therefore, when configuring an isolator or a duplexer using a conventional high-power circulator, the circuit has the disadvantage of being complicated and large.

The object of the present invention is that when used as a circulator for an isolator or a branching filter, the device itself does not become large;
The objective is to provide a high-power circulator that is not expensive.

In order to achieve the above object, the circulator according to the present invention is a circulator that includes a 4-terminal in-phase negative-phase 3 dB divider such as Magic T, a 4-terminal -3 dB divider such as an irreversible phase shifter, and a short slot hybrid. Either one of the in-phase and anti-phase 3 dB divider or the 4-terminal 73 dB divider is configured as a 3-terminal divider.

According to the above configuration, when used as a circulator for an isolator or a duplexer, the configuration is simple, the number of dummy loads can be reduced by one, and the dummy load can be reduced by one, making it inexpensive and compact, and the object of the present invention is completely achieved.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIGS. 7 and 8 show a first embodiment of a high power circulator according to the present invention, and are a front view and a side view. In FIGS. 7 and 8, a modified T-branch 12 is used as a three-terminal divider, b1 modified T-branch 12, and an irreversible phase shifter 4. It is composed of a short slot hybrid 5 and an H-bend WG6.

FIG. 9 is a diagram for explaining the circulator operation of this embodiment. The signal input from terminal 13 of H-bend WG6 passes through point C and is connected to short slot hybrid 5.
The signal is distributed to 93 dB at points b and b/point, and the phase of the signal at point b is -more advanced than that at point b'. Here, point c7 becomes an isolation terminal with respect to point C, and no signal is output to terminal 15. Next, the signal applied to the irreversible phase shifter 4 is the signal at point a since the polarity of magnet 2 and the DC magnetic field are adjusted so that the signal at point b' leads - ahead of point b. are in phase and distributed in 3 dB increments. The modified T-branch 12 has an appearance as shown in Fig. 10, and impedance matching of all terminals cannot be achieved when used alone, but when using this circulator, the terminal 14
Keep impedance matching at. If adjusted in this way, the modified T-branch 12 is a symmetric reversible circuit, so
The signals distributed to points a and a/a by 3 dB in the same phase as described above are combined with impedance mismatch and output to the terminal 14.

Next, when a signal is input from the terminal 14, the signal is outputted through the modified T-branch 12 and distributed in phase by 3 dB to points a and a1. By passing these signals through the non-reciprocal phase shifter 4, the phase of the signal at point b is i leading than the phase at point b'. When the signals at points b and b' pass through the short slot hybrid 5, they become in phase at point 01, are combined, and a signal is output to the terminal 15. On the other hand, at point C, the phase is reversed and the signal is output.

Finally, considering the signal input from terminal 15 as described above, short slot 5. It passes through the -H irreversible phase shifter 4 and is distributed at points a and a' by 3 dB, and the phase relationship is reversed so that it is not output to the terminal 14 and is not output to the modified T branch 12.
completely reflected. The reflected signal is transferred to the i irreversible phase shifter 4.
After passing through, the signal at point b' has a phase that is i ahead of point b.

When the signals at points b and b' pass through the short slot hybrid 5, the signals at point 01 have opposite phases and are not output. Further, at point C, the signals are combined into the same phase and output to the terminal 13. In other words, it operates as a 3-terminal circulator.

Fig. 11 shows actual measured values of the characteristics of this circulator. The curved line is the passing loss between the terminals 13→14, the curve B is the terminal 14→15, the curve C is the passing loss between the terminals 15→13, the curved line is the passing loss between the terminals 13→15, the curve E is the terminal 15→14, the curve F
indicates the isolation ratio between each terminal from terminal 14 to terminal 13.

12, 13, 14, and 15 show the second embodiment of the present invention. A third example is shown.

In FIGS. 12 and 13, a three-terminal circulator is realized by replacing the modified magic T1 used as the four-terminal in-phase and negative-phase 3 dB distributor in FIG. 3 with a modified T branch 12. Figures 14 and 15 are the 4 terminals in Figure 3 -H3dB3
Configure and include dB. Transformation Magic T1 Transformation T Branch 1
2 to realize a 3-terminal circulator.

FIGS. 16 and 17 are diagrams showing specific usage examples of the three-terminal circulator shown in FIGS. 7 and 8.

Fig. 16 shows a schematic diagram of an isolator circuit in which a dummy load IO is connected to one terminal 14 of a three-terminal circulator, and Fig. 17 shows a schematic diagram of an isolator circuit in which a dummy load IO is connected to one terminal 14 of a three-terminal circulator.
3 is connected to a band-pass F wave filter 11 to form a duplexer.

As explained in detail above, according to the present invention, a conventional 4-terminal in-phase and anti-phase 3dB divider, an i-irreciprocal phase shifter, and a 4-terminal T3
An inexpensive and compact 3-terminal circulator can be realized by using either the 4-terminal in-phase negative-phase 3 dB distributor or the 4-terminal -3 dB distributor as a 3-terminal distributor in a 4-terminal circulator composed of a dB distributor. .

[Brief explanation of drawings]

Figures 1 and 3 are front views of a conventional 4-terminal circulator, Figures 2 and 4 are side views of Figures 1 and 3, respectively.
Fig. 5 is a circuit diagram of an isolator configured with a conventional 4-terminal circulator, Fig. 6 is a circuit diagram of a duplexer configured with a conventional 4-terminal circulator, and Fig. 7 is a circuit diagram of an isolator configured with a conventional 4-terminal circulator. FIG. 8 is a front view of the terminal circulator, FIG. 8 is a side view of FIG. 7, FIG. 9 is a diagram of the operating principle of the three-terminal circulator shown in FIGS. 7 and 8, and FIG. FIG. 11 is a diagram showing the characteristics of a three-terminal circulator, FIGS. 12 and 14 are front views of a three-terminal circulator showing another embodiment according to the present invention, and FIGS. 13 and 15 are respectively FIGS. FIG. 14 is a side view, FIG. 16 is a circuit diagram of an isolator constructed with a circulator according to the present invention, and FIG. 17 is a circuit diagram of a duplexer constructed with a circulator according to the present invention. l...Deformation magic T2...Ferrite 3...Magnet 4...i irreversible phase shifter 5...-reversible phase shifter 6...H bend WG7...i reversible phase shifter 8... 4-terminal circulator 9, lO... dummy load 11... bandpass F-wave device 12... modified T-branch 13
．． 14.15...Terminal patent applicant NEC Co., Ltd. agent Patent attorney Jusai Inoro 1 Figure 23 Figure 24 ■ Figure 5 26 Figure 27 Figure 3 b 8@O9vA Figure 10 Figure 11 12th figure 13th figure

Claims (1)

[Claims] 4-terminal in-phase and negative-phase 3dB dividers such as Magic T, 4-terminals such as irreversible phase shifters and short slot hybrids.
A circulator comprising a 3 dB divider, characterized in that either a 4-terminal in-phase anti-phase 3 dB divider or a 4-terminal 73 dB divider is a 3-terminal divider.