JPH08148908A - Irreversible circuit element - Google Patents

Abstract

PURPOSE: To evade short-circuit on a matching capacitive capacitor outer side face, to simplify the connection of a center conductor grounding electrode of a printed board and a pedestal grounding electrode connected to the grounding terminal of a case more than conventional one and to provide an irreversible circuit element capable of easily performing confirmation. CONSTITUTION: In this irreversible circuit element composed by arranging a center conductor printed board 103 for which a center conductor composed of plural mutually insulated strip conductors is formed on the both-surface printed board and at least one ferritic plate 104 with the approximately same center and applying a DC magnetic field in upper and lower permanent magnets 102 and 113, the external shape of the center conductor printed board 103 partially covers the electrode surfaces of the matching capacitive capacitors 106 for the same number as input/output terminals and is formed to be larger than the external shape of the ferritic plate 104. Also, the grounding electrode of the center conductor is provided with the grounding electrode of a side-cut through-hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonreciprocal circuit device used in microwave communication equipment, mobile communication equipment and the like.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional non-reciprocal circuit device has a central conductor printed circuit board 3 which constitutes a central conductor.
And one ferrite plate 4, matching capacitance 6, terminating resistor 7
Is installed on the pedestal 5, and the input / output terminal 11 and the ground terminal 10
The case 9 is provided with a structure in which necessary parts are secured for electrical continuity (input / output terminals located on the opposite side of the case are not shown), and permanent magnets 2 and 13 and magnetic yokes 1 and 14 are used from above and below. To form a closed magnetic circuit and apply a DC magnetic field to the ferrite plate 4 and the central conductor printed board 3 to form a nonreciprocal circuit device.

FIG. 5 is an enlarged view of the ground plane and the component plane of the central conductor printed board 3 shown in FIG.

Here, the external dimensions of the central conductor printed board 3 are such that all electrode surfaces of the matching capacitance capacitors 6 installed near the ferrite plate 4 are covered.

The central conductor printed circuit board 3 is an input / output electrode 1 on the component side of the printed circuit board 3 to which the matching capacitor 6 is soldered.
7a, 17b, 17c and these input / output electrodes 17a, 1
7b, 17c and the earth electrodes 18a, 1 facing each other
8b and 18c, the input / output electrodes 17a,
17b, 17c and ground electrodes 18a, 18b, 18c
Is a plurality of strip conductors 19 and 1 provided on the ground surface and the component surface of the printed circuit board 3 at equal angular intervals.
9'is made conductive as a central conductor through the through hole 16 and is integrated through the through hole 25 of the ground electrode 15.

At the time of assembly, the ground electrodes 18a, 18b, 18c of the central conductor printed board 3 are electrically connected to the ground electrode 20 in the pedestal 5 shown in FIG.
0 is electrically connected to the ground terminal 10 of the case 9.

The ground electrodes 18a, 18b, 18c
Are located at d, e, and f portions of the ground plane of the printed circuit board 3 and near the ferrite plate 4 and the matching capacitor 6.

[0008]

In the conventional non-reciprocal circuit device, the external dimensions of the printed circuit board 3 are such that all the electrode surfaces of the matching capacitance capacitors 6 are completely covered. When soldering, there is a possibility of short-circuiting on the outer surface of the matching capacitor 6, which is one of the points to be noted in the manufacturing process.

Further, when the center conductor printed board 3 and the pedestal 5 are soldered, each of the ground electrodes 18a, 18b, 18c in the center conductor printed board 3 and the ground electrode 20 in the pedestal 5 in the conventional board is soldered. Since the connection is soldered on the connection surface of the matching capacitor 6 of the printed circuit board 3, that is, the component surface which cannot be confirmed from above, it is difficult to confirm the connection state during the work.

In addition, it causes a short circuit in the soldered portion of the matching capacitance capacitor 6, and further, in some other portions (for example, the ferrite plate 4 of the matching capacitance capacitor 6) due to defective solder or too much solder depending on the amount of solder.
This is one of the most important points in the work process when constructing a non-reciprocal circuit device.

An object of the present invention is to avoid a short circuit on the outer surface of the matching capacitor and simplify the connection between the center conductor earth electrode of the printed board and the pedestal earth electrode connected to the earth terminal of the case as compared with the prior art. , To provide a non-reciprocal circuit device that can be easily confirmed.

[0012]

In order to solve the above-mentioned problems, the present inventor has made the external dimensions of the central conductor printed board larger than the external dimensions of the ferrite plate, and the electrodes of each matching capacitance capacitor are partially It has been found that it is possible to prevent a short circuit on the outer surface of the matching capacitance capacitor by forming it to a minimum to cover it. Also, by connecting the central conductor earth electrode of the printed circuit board to the ground electrode using the side cut through holes on the side surface of the printed circuit board,
We have found that the problem can be solved by soldering the ground electrode of the pedestal at a part away from the ferrite plate to ensure continuity.

That is, according to the present invention, a central conductor printed board in which a central conductor composed of a plurality of strip conductors insulated from each other is formed of a double-sided printed board,
In a non-reciprocal circuit element in which a plurality of ferrite plates are arranged at substantially the same center and a DC magnetic field is applied by a permanent magnet, the outer shape of the central conductor printed board has the same number of electrodes of matching capacitance capacitors as input / output terminals. A non-reciprocal circuit device is obtained, which partially covers the surface and is formed larger than the outer shape of the ferrite plate.

Further, according to the present invention, there is obtained a nonreciprocal circuit device characterized in that the ground electrode of the side conductor is provided on the ground electrode of the central conductor made of a double-sided printed circuit board.

[0015]

According to the present invention, since the outer dimensions of the printed circuit board are set to the minimum shape that covers only a part of the electrode surface of the matching capacitor, it is possible to surely make the ground connection of the center conductor, which was difficult to confirm in the prior art. A short circuit on the outer surface of the matching capacitor is also eliminated.

Further, since the center conductor is grounded using the side cut-through holes, more reliable soldering is possible and the soldering can be easily confirmed from the upper surface.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-reciprocal circuit device according to an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is an exploded perspective view of the nonreciprocal circuit device of this embodiment.

In the nonreciprocal circuit device of this embodiment, the ferrite plate 104 is housed in the pedestal 105 so as to be flush with the three matching capacitance capacitors 106 and the terminating resistors 107, and the center conductor printed circuit board 103 is located in the plane position. Soldered at required several places on the upper surface of the pedestal 105. At this point, the ground electrode 11 of the center conductor printed circuit board 103
It is possible to confirm the connection of 8a, 118b and 118c and the presence or absence of a short circuit on the side surface of each matching capacitor 6.

Further, in the nonreciprocal circuit device of this embodiment, the assembly 122 in which the ferrite plate 104, the pedestal 105, the central conductor printed circuit board 103 and the like are integrated has the input / output terminal 111 and the ground terminal 110. Case 10
The permanent magnets 102 and 103 for applying a DC magnetic field to the assembly 122 and the magnetic yokes 101 and 114 for forming a closed magnetic circuit are housed in the permanent magnet 10.
It has the structure arrange | positioned at the upper and lower parts of 2,113. still,
Although two permanent magnets 102 and 103 are provided in this embodiment, only one of the upper and lower permanent magnets may be provided.

The pedestal 105, which is housed in the case 109 and secures necessary electrical continuity, is provided with an input / output electrode 124 to which the input / output ends of the central conductor printed circuit board 103 are connected, and the input / output electrode 124 is provided through the through hole to the case. 109 is electrically connected to the in-case input / output electrode 121 and is connected to the input / output terminal 111.
Has been conducted to. In addition, the ground terminal 1 of the case 109
10 is electrically connected to the ground surface 112 in the case, and the pedestal 1
Conductive with the ground (not shown) in the lower part of 05.

In FIG. 1, the number of ferrite plates is one, but it may be two.

FIG. 2 shows an enlarged view of the ground plane and the component plane of the central conductor printed circuit board 103 according to this embodiment.

As shown in FIG. 2, the central conductor printed circuit board 103 has input / output electrodes 17a, 17 on the component side of the printed circuit board 103 to which the matching capacitor 106 is soldered.
b, 17c and the earth electrode 118 facing each other
a, 118b, 118c, and the input / output electrodes 117a, 117b, 117c and the ground end electrode 118.
a, 118b, and 118c electrically connect a plurality of strip conductors 19 and 119, which are provided on the ground surface and the component surface of the printed circuit board 103 at equal angular intervals, as a center conductor through the through holes 116 and connect the ground electrodes 115 and g. , H, i are electrically connected by side cut-through holes.

Since the outer dimensions of the center conductor printed circuit board 103 are made as small as possible so as to come into contact with a part of the electrode surface of the matching capacitance capacitors 106 as compared with the conventional substrate outer dimensions, It is possible to check for short circuits and connections on the outer surface.

Incidentally, like the center conductor earth electrode 115,
In order to prevent a short circuit, the ground electrode 115 may be designed to have a gap 123 at a constant distance from the side surface of the substrate.

FIG. 3 shows an example of mounting the central conductor printed board 103 in a nonreciprocal circuit device according to another embodiment of the present invention, in which the center of the assembly 122 and the center conductor printed board 103 are arranged at the same position. .

In the present embodiment, the ground electrodes 118a, 118b, 118c of the central conductor printed board 103 can be securely soldered to the ground electrode 120 on the pedestal 105, so that the confirmation can be performed from the top. Therefore, the short circuit on the outer surface of each matching capacitance capacitor 106 is eliminated, and the presence or absence of the short circuit can be easily confirmed.

[0029]

As described above, according to the present invention,
By making the external dimensions of the printed circuit board a minimum shape that covers only a part of the matching capacitance capacitor electrode surface, it is possible to prevent a short circuit on the outer surface of each matching capacitance capacitor and to easily confirm the connection state.

Therefore, the efficiency of the assembling work of the non-reciprocal circuit device can be greatly improved.

Further, by connecting the center conductor to the ground using the side cut-through hole, more reliable soldering becomes possible, and the soldering can be easily confirmed from the upper surface.

Therefore, in the manufacture of the non-reciprocal circuit device,
Since defective products can be reduced and the work process can be simplified, it is also useful for cost reduction.

Therefore, it is possible to provide a non-reciprocal circuit device capable of simplifying the working process, improving the yield, and reducing the cost.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a non-reciprocal circuit device according to an embodiment of the present invention.

2 is an enlarged view of a ground plane and a component plane of a central conductor printed circuit board used in the nonreciprocal circuit device shown in FIG.
(A) is an enlarged view of the ground plane of the center conductor printed circuit board,
(B) is an enlarged view of a component surface of the central conductor printed board.

FIG. 3 is a diagram showing a method for mounting a central conductor printed board in a non-reciprocal circuit device according to another embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a conventional non-reciprocal circuit device.

FIG. 5 is an enlarged view of a ground surface and a component surface of a central conductor printed circuit board used in a conventional non-reciprocal circuit device,
(A) is an enlarged view of the ground plane of the center conductor printed circuit board,
(B) is an enlarged view of a component surface of the central conductor printed board.

[Explanation of symbols]

 1,101 Magnetic yoke 2,102 Permanent magnet 3,103 Printed circuit board 4,104 Ferrite plate 5,105 Pedestal 6,106 Matching capacitor 7,107 Termination resistor 8,108 Recessed portion 9,109 Case 10,110 Ground terminal 11, 111 Input / output terminal 12,112 Ground plane 13,113 Permanent magnet 14,114 Magnetic yoke 15,115 Ground electrode 16,116 Through hole 17,117 Input / output electrode 18,118 Ground electrode 19,119 Strip conductor 20,120 Ground electrode 21, 121 Input / output electrode 122 Assembly 23, 123 Gap 24, 124 Input / output electrode 25 Through hole g, h, i Side cut through hole

Claims (2)

[Claims] 1. A central conductor printed board having a central conductor formed of a plurality of strip conductors insulated from each other by a double-sided printed board, and at least one ferrite plate.
In a non-reciprocal circuit element which is arranged at substantially the same center and is applied with a DC magnetic field by a permanent magnet, the outer shape of the central conductor printed circuit board partially covers the electrode surface of the matching capacitance capacitors as many as the input / output terminals. A nonreciprocal circuit device having a larger outer shape than the ferrite plate. 2. The nonreciprocal circuit device according to claim 1, wherein a ground electrode of a side cut through hole is provided on a ground electrode of a central conductor made of a double-sided printed circuit board.