JPH0223081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in lumped constant circulators and isolators.

FIG. 1 shows the structure around the center conductor of a conventional lumped isolator. Center conductors 4a, 4b, and 4c are arranged within the ferrite core 5 and the shield plate 6 so as to be electrically insulated from each other. This center conductor includes capacitors 3a, 3b, 3c for parallel resonance with the irreversible inductor, and inductive reactance elements 1a, 1b, 1b for series resonance, respectively.
1c, capacitors 2a, 2b, 2c, and further a dummy load resistor 7 are connected by soldering or welding.

Further, an equivalent circuit of this conventional example is shown in FIG.

As mentioned above, conventional lumped constant isolators have a large number of capacitors, require a large amount of man-hours during assembly, and are difficult to mount each capacitor with high precision. was necessary. This drawback also applies to conventional lumped constant type circulators.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a circulator and an isolator that simplify assembly, manufacture and adjustment.

In order to achieve the above object, the present invention configures a resonant capacitor by forming electrodes on both sides of a dielectric substrate. for example,
Ag or
Ag-Pd was printed as an electrode to a film thickness of 10 μm, and a capacitor for parallel resonance with an irreversible inductor was constructed on one substrate, and an inductive reactance element in series was similarly placed on another substrate. This constitutes a capacitor for series resonance with.

Hereinafter, it will be explained in detail using examples.

FIG. 3 relates to one embodiment of the present invention;
FIG. 2 is a plan view of a ceramic substrate constituting a parallel resonance capacitor with an irreversible inductor;
It is a bottom view of the same, C is a plan view of a ceramic substrate that constitutes a series resonance capacitor with an inductive reactance element, and D is a bottom view thereof.

As shown in the figure, Ag or Ag-Pd is printed as electrodes on both sides of the ceramic substrate 9 for parallel resonance. Then, the first
Constructing the capacitor 3a shown in the figure, similarly constituting the capacitor 3b shown in FIG. 1 between electrodes 10b and 10d, and condenser 3c shown in FIG. 1 between electrodes 10c and 10d. It is.
Further, a dummy load resistor 7 is made of ruthenium oxide, and this dummy load resistor 7 is connected to the electrode 10d through a through hole 14. Also,
Electrodes 15a, 15b, 15c, and 15d are for fixing terminals. Further, in the center of this ceramic substrate 9 for parallel resonance, there is a hole 1 into which a shield plate covering the ferrite core holding the arranged center conductors can be inserted.
1a is provided.

Similarly, the series resonance ceramic substrate 13 has electrodes printed on both sides. A capacitor 2a shown in FIG. 1 is connected between electrodes 10e and 10h, a capacitor 2b is connected between electrodes 10f and 10j, and a capacitor 2 is connected between electrodes 10g and 10i.
c. And 12a, 12
b, 12c, 12d are holes for attaching terminals,
In the center is a hole 11b into which a shield plate covering the ferrite core holding the arranged center conductors can be inserted.
is provided.

FIG. 4 shows an exploded perspective view of the inside of a case of a lumped constant broadband isolator according to an embodiment of the present invention using the ceramic substrate 9 for parallel resonance and the ceramic substrate 13 for series resonance shown in FIG. 3.
Further, A of an embodiment according to the present invention shown in FIG.
-A sectional view is shown in FIG.

In this embodiment, ferrite cores 5 are loaded on top and bottom of center conductors 4a, 4b, and 4c arranged at 120 degree intervals in an electrically insulated state, and the periphery of the ferrite cores 5 is further covered with a shield plate 6, which is a ceramic material for parallel resonance. It is inserted into the hole 11a of the substrate. At this time, the non-grounded side pieces of the center conductor are positioned on the surfaces of the electrodes 10a, 10b, and 10c. The series resonance ceramic substrate 13 also has terminal mounting holes 12a, 12b,
Terminals 8a, 8b, 8c, 8d are attached to electrodes 12c, 12d, and inductive reactances 18a, 18b, 18c are connected between electrodes 10e, 10f, 10g and terminals 8a, 8b, 8c. Then, these two ceramic substrates 9 and 13 are stacked, and each part is connected with cream or paste solder (melting point
100-200℃) to perform heat treatment. In addition, the connection between the case 17 and the electrode 10d, and the case 17
The connection between the shield plate 6 and the shield plate 6 is made in the same manner. Further, a permanent magnet 16 is arranged on the upper part of the shield plate 6.

In the isolator or circulator having the structure described above, the center frequency and bandwidth can be adjusted by setting the shape and area of the electrodes printed on each ceramic substrate. Further, the required amount of attenuation in each direction can be easily satisfied by adjusting the impedance of the inductive reactance under a constant DC magnetic field, in addition to the effect of widening the band.

Although the present invention has been explained using a lumped constant wideband isolator as an example, the same effect can be obtained with a lumped constant wideband circulator.
Similar effects can also be obtained with lumped constant narrow band isolators and circulators.

In addition to printing, there are other ways to form electrodes.
Coating or other methods may also be used.

Further, as for the dielectric substrate, a dielectric substrate other than a ceramic substrate may be used.

As detailed above, in the isolator and circulator according to the present invention, by configuring all the capacitors, which were conventionally connected in large numbers to the center conductor, from ceramic substrates, it is possible to obtain a significant improvement in the number of assembly steps and assembly accuracy. Further, because of this, adjustment can be achieved by adjusting only the impedance of the inductive reactance element under a constant DC magnetic field, which is extremely effective in reducing costs and improving productivity.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of a conventional lumped constant isolator, FIG. 2 is an equivalent circuit of FIG. 1, and FIG. 3 is a diagram of a ceramic substrate for parallel resonance according to an embodiment of the present invention. They are a top view A and a bottom view B, and a top view C and a bottom view D of a ceramic substrate for series resonance, and FIG. FIG. 5 is a cross-sectional view taken along the line AA after the isolator shown in FIG. 4 is assembled. 1a, 1b, 1c, 18a, 18b, 18c...
...Inductive reactance, 2a, 2b, 2c, 3
a, 3b, 3c...Capacitor, 4a, 4b, 4
c... Center conductor, 5... Ferrite core, 6...
Shield plate, 7...Dummy load resistance, 8a, 8
b, 8c, 8d... terminal, 9... ceramic substrate for parallel resonance, 10a, 10b, 10c, 10d,
10e, 10f, 10g, 10h, 10i, 10
j, 15a, 15b, 15c, 15d... electrode,
11a, 11b, 12a, 12b, 12c, 12
d...hole, 13...ceramic substrate for series resonance,
14...Through hole, 16...Permanent magnet, 17
……Case.

Claims (1)

[Claims] 1. In lumped constant type circulators and isolators, which have a center conductor arranged at 120 degree intervals in an electrically insulated state in the center, and a ferrite core and a shield plate are loaded above and below the center conductor, the ferrite Two dielectric substrates are provided, each having a hole for inserting a core and a shield plate, and having electrodes formed on both sides to constitute a capacitor, one of the dielectric substrates being placed on the ground side for parallel resonance, and the other being arranged on the ground side for parallel resonance. One of the dielectric substrates is stacked on the parallel resonance dielectric substrate for series resonance, and the non-grounded side piece of the center conductor is placed between the electrodes connected between the two dielectric substrates. Lumped circulators and isolators.