JP2002094305A - Electronic circuit unit provided with circulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic circuit unit provided with a circulator, having a small size and superior productivity. SOLUTION: In the electronic circuit unit, provided with the circulator, the circulator S1 is formed by using a part of a printed circuit board 1 and manufactured during the manufacturing process of an electronic circuit to the printed circuit board 1, then the small-sized electronic circuit unit provided with the circulator can be provided that has the productivity and the space factor superior to those of the conventional electronic circuit units.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electronic circuit unit having a circulator suitable for use in an electronic circuit unit such as an antenna duplexer.

[0002]

2. Description of the Related Art A conventional electronic circuit unit having a circulator will be described with reference to FIGS. 5 and 6. The circulators S2 are arranged at intervals of 120 degrees and partially arranged so as to cross each other. A dielectric substrate 52 having a plurality of center conductors 51 attached thereto, magnets 53 disposed above and below the intersection of the center conductors 51, and ferrite (not shown)
A first yoke 54 made of a magnetic material disposed so as to cover the outside of the magnet 53 located at the upper part; and a first yoke 54 joined to the first yoke 54 so as to cover the outside of the ferrite located at the lower part. Second yoke 5 made of magnetic material
5 is comprised.

The circulator S2 has a first
A magnetic closed circuit is formed by the second yokes 54 and 55, and the input / output terminals 5 provided on the three central conductors 51 are provided.
The circulator S2 is formed of a single product, with the configuration in which 1a protrudes outside from the sides of the first and second yokes 54 and 55.

A circuit board 56 such as an antenna duplexer has holes 5
6a are provided, and a plurality of conductive patterns 57 are provided around the hole 56a. Various electric components (not shown) are mounted on the circuit board 56 on which the conductive pattern 57 is formed, and a desired electronic circuit is formed.

A circulator S2 made of a single product
Is located in the hole 56a of the circuit board 56, and the center conductor 5
The first terminal 51a and a ground electrode (not shown) are placed on the conductive pattern 57, and these are connected to the conductive pattern 57 by soldering. With such a configuration, a conventional circulator is provided. An electronic circuit unit is formed.

[0006]

In a conventional electronic circuit unit having a circulator, a circulator S
2 is formed as a single item, and the single item circulator S2 is soldered to the circuit board 56.
There is a problem that the productivity is low, the space factor is low, and the size becomes large.

Accordingly, an object of the present invention is to provide an electronic circuit unit having a circulator which is small and has good productivity.

[0008]

Means for Solving the Problems As a first means for solving the above-mentioned problems, a conductive pattern is provided, a plurality of insulating substrates are laminated, and an electric component is provided. A circuit board on which an electronic circuit is formed, a dielectric board provided separately from the circuit board and having first, second, and third center conductors that partially cross in the vertical direction; A dielectric circulator comprising: a magnet disposed above and below a crossing portion of the conductor; a ferrite; a first yoke covering the outside of the magnet; and a second yoke covering the outside of the ferrite. Each of the first, second, and third center conductors is laminated with a dielectric interposed therebetween, and the dielectric substrate is housed in a first concave portion provided on the circuit board. In the state, the first and second Third central conductor was connected to each said conductive pattern.

As a second solution, the dielectric substrate is formed by alternately laminating the center conductor and the dielectric on an insulating thin plate. Further, as a third solution, both ends of the first, second and third central conductors are formed so as to be exposed on the surface of the insulating thin plate.

[0010] Further, as a fourth solution, the first, second and third solutions are used.
The second and third central conductors were formed of two conductors. Further, as a fifth solution, the magnet is arranged above the dielectric substrate, and the ferrite is arranged below the dielectric substrate, and the ferrite is arranged at a position near the magnet. The first or second yoke is inserted into the through hole of the circuit board, and the first and second yokes constitute a magnetic closed circuit.

According to a sixth aspect of the present invention, the circuit board has a second concave portion formed at a lower portion connected to the first concave portion located at an upper portion, and the second concave portion is formed in the second concave portion. The structure accommodated ferrite. As a seventh solution, one ends of the first, second, and third center conductors are respectively connected to the conductive patterns, and the other ends of the first, second, and third center conductors are connected to each other. The circuit board is connected to the second yoke via a through-hole conductor filled in a hole provided in the circuit board and grounded.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings of an electronic circuit unit provided with a circulator of the present invention, FIG. 1 is a sectional view of a main part of an electronic circuit unit provided with a circulator of the present invention, and FIG. 2 is a circulator of the present invention. FIG. 3 is an exploded perspective view showing an electronic circuit unit having a circulator according to the present invention, and FIG. 3 is a plan view of a dielectric substrate according to the electronic circuit unit having a circulator of the present invention. FIG. 4 is an equivalent circuit diagram of the circulator, which relates to an electronic circuit unit including the circulator of FIG.

Next, the structure of an electronic circuit unit having a circulator according to the present invention will be described with reference to FIGS. 1 to 4. A circuit board 1 used for an electronic circuit unit such as an antenna duplexer is composed of a plurality of ceramics. An insulating substrate 2 made of a green sheet is laminated. And
This circuit board 1 is provided with a conductive pattern 3 of a desired shape formed by printing of silver or the like between the surface of the first-layer insulating substrate 2 located on the uppermost surface and the insulating substrate 2 and the like. The conductive patterns 3 are electrically connected by hole conductors (described later).

A plurality of capacitors 4 formed by printing and various chip-shaped electric components (not shown) are provided on the upper surface of the circuit board 1 to form a desired electronic circuit. ing. Further, the plurality of capacitors 4 are provided with conductive patterns 3 a provided on the upper surface of the circuit board 1.
And a ground pattern 3b provided with a dielectric therebetween. The capacitor 4 may be of a chip type.

Next, the circulator S1 of the present invention
The circulator S1 is composed of a first and a second thin film patterns each partially crossing in the vertical direction.
Dielectric substrate K having second and third center conductors 5, 6, 7
, And magnets 8 and ferrites 9 arranged above and below the crossing portion, and first and second yokes 10 and 11 made of a magnetic material that cover the outside of the magnet 8 and the ferrite 9.

The dielectric substrate K includes an insulating thin plate 31 made of a thin ceramic as a dielectric, and first, second, and third center conductors 5, 6, 7 formed on the insulating thin plate 31;
The first and second center conductors 5, 6, and 7 are provided between the first and second center conductors 7 and 7, and the dielectric 32 is formed on the third center conductor 7. The first, second, and third center conductors 5, 6, and 7 are composed of, for example, two conductors made of a thin film layer of titanium and copper formed by sputtering, and the dielectric 32 is made of, for example, And a thin film of silicon dioxide formed by sputtering. Further, both ends of the first, second, and third center conductors 5, 6, 7 are formed on the surface of the insulating thin plate 31 in a state of being exposed outside the dielectric 32, and the dielectric 32 is interposed therebetween. The first, second, and third center conductors 5, 6, and 7, which are stacked on each other, are arranged at an interval of 120 degrees from each other with their center portions crossing each other.

A first concave portion 1a for accommodating the dielectric substrate K is formed at an upper portion of the circuit board 1, and a first concave portion 1a is formed at a lower portion of the circuit board 1 so as to be connected to the first concave portion 1a.
A second recess 1b for accommodating the ferrite 9 is provided, and a shoulder 1c is provided between the first and second recesses 1a and 1b. Also, this circuit board 1 has
A plurality of holes 1d provided in the middle of the circuit board 1 between the shoulders 1c and between the lower surface of the circuit board 1 and the shoulders 1c, and a pair of holes provided in the vicinity of the first recess 1a and penetrating vertically. Are provided.

Then, as shown in FIG. 1 in particular, the dielectric substrate K has the first concave portion 1
a, the first, second, and third center conductors 5, 6,
7 is connected to the conductive pattern 3 by a through-hole conductor 14 made of a conductive paste such as silver filled in the hole 1d, and connected to the capacitor 4 for the circulator S1. , Third center conductors 5, 6, 7 are grounded by through-hole conductors 15 made of conductive paste such as silver filled in holes 1d.

The magnet 8 is placed on the insulating thin plate 31 of the dielectric substrate K, and the ferrite 9 is arranged in the second concave portion 1b.
The first, second, and third center conductors 5, 6, and 7 are arranged so as to sandwich the crossing portion from above and below. The first yoke 10 has an upper wall 10a and a cylindrical side wall 10b bent at a right angle from an end of the upper wall 10a. Is mounted on the circuit board 1 in a state of covering the outside of the magnet 8 arranged in the circuit board 1.

The second yoke 11 is formed of a U-shaped magnetic plate, and has a lower wall 11a, a pair of side walls 11b bent at a right angle from the lower wall 11a, and a plurality of lower walls 11a. Hole 11c. Then, the second yoke 11 covers the outside of the ferrite 9 with the lower wall 11a, and inserts the pair of side walls 11b into the through holes 1e.
By attaching the solder 12, the side walls 10b, 11b of the first and second yokes 10, 11 are joined, and as a result, a magnetic path is formed by the first and second yokes 10, 11, thereby forming a magnetic closed circuit. Become so. Further, the hole 11c of the second yoke 11 has a conductor 1 made of a conductive paste such as copper powder.
3, the through-hole conductor 15 is connected to the second yoke 11, and the first, second, and third center conductors 5,
The other ends of 6 and 7 are grounded via a through-hole conductor 15 and a conductor 13.

With such a configuration, the circulator S
1, the circulator S1 includes first, second, and third central conductors 5, 5 as shown in the equivalent circuit diagram of FIG.
An input / output terminal 21 is provided at one end of each of the first and second central conductors 5, 6, 7 and the input / output terminal 21.
, A grounded capacitor 4 is connected.

An electronic circuit unit incorporating such a circulator S1 is checked for its electrical performance. In particular, when checking the performance of the circulator S1, the first and second yokes 10, 11 are checked. Is performed in a state in which is embedded, and in order to obtain a desired performance, a part of the electrode 3a of the capacitor 4 is trimmed by trimming.

It should be noted that the first yoke 10 may be a square or larger polygonal tube.

[0024]

In the electronic circuit unit provided with the circulator according to the present invention, the circulator S1 is formed by using a part of the circuit board 1 and is manufactured in the process of manufacturing the electronic circuit on the circuit board 1. Since it is possible, the productivity is better and the space factor is better than before,
An electronic circuit unit having a small circulator can be provided. Further, the first, second, and third center conductors 5, 6, 7
Is formed separately from the circuit board 1, the center conductors 5, 6, and 7 can be formed by sputtering or the like, and a highly accurate and thin one can be obtained. Further, the first and second yokes 10 and 11 provided in the circuit board 1 use the magnet 8
Since the first and second yokes 10 and 11 can be reduced in size, the size of the first and second yokes 10 and 11 can be reduced, the productivity can be improved, and an electronic circuit unit having a small circulator can be provided.

Further, since the dielectric substrate K is formed by alternately laminating the center conductors 5, 6, 7 and the dielectric 32 on the insulating thin plate 31, the center conductors 5, 6, 7 and the dielectric 32 can be formed by sputtering, and a high-precision and thin type can be obtained.

The first, second and third center conductors 5,
Since both ends of the central conductors 6, 7 are exposed on the surface of the insulating thin plate 31, both ends which are the lead-out portions of the center conductors 5, 6, 7 are flush with each other, and are connected to the conductive pattern 3 by through-hole conductors. Can be provided easily.

The first, second, and third center conductors 5,
Since 6 and 7 are formed of two conductors, a high-performance one is obtained.

A magnet 8 is disposed above the dielectric substrate K, and a ferrite 9 is disposed below the dielectric substrate K.
Are disposed, and the first or second yoke 10, 1 is provided in the through hole 1e of the circuit board 1 provided at a position near the magnet 8.
1 is inserted, and a magnetic closed circuit is formed by the first and second yokes 10 and 11, so that a magnetic closed circuit can be formed in the circuit board 1 and a small one can be obtained.

The circuit board 1 has a first
The second concave portion 1b formed at the lower portion connected to the concave portion 1a
And a thin type in which the ferrite 9 is housed in the second concave portion 1b is obtained.

The first, second, and third center conductors 5,
One end of each of the first and second central conductors 6, 7 is connected to the conductive pattern 3, and the other end of each of the first, second, and third central conductors 5, 6, 7 is filled in a hole 1 d provided in the circuit board 1. Since it is connected to the second yoke 11 via the through-hole conductor 15 and grounded, the structure is simple, the productivity is good, and a grounded one is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an electronic circuit unit including a circulator of the present invention.

FIG. 2 is an exploded perspective view of the electronic circuit unit including the circulator of the present invention, showing a state where a first yoke is removed.

FIG. 3 is a plan view of a dielectric substrate according to an electronic circuit unit including the circulator of the present invention.

FIG. 4 is an equivalent circuit diagram of the circulator according to the electronic circuit unit including the circulator of the present invention.

FIG. 5 is an exploded perspective view of a circulator according to an electronic circuit unit including a conventional circulator.

FIG. 6 is an exploded perspective view of an electronic circuit unit including a conventional circulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 1a 1st recessed part 1b 2nd recessed part 1c Shoulder 1d hole 1e Through hole 2 Insulating substrate 3 Conductive pattern 3a Electrode 3b Grounding pattern 4 Capacitor S1 Circulator K Dielectric substrate 5 First central conductor 6 Second Center conductor 7 Third center conductor 8 Magnet 9 Ferrite 10 First yoke 10a Upper wall 10b Side wall 11 Second yoke 11a Lower wall 11b Side wall 11c Hole 12 Solder 13 Conductor 14 Through hole conductor 15 Through hole conductor 21 Input / output Terminal 31 Insulated thin plate 32 Dielectric

Claims (7)

[Claims] 1. A circuit board having a conductive pattern, a plurality of insulating boards being laminated and provided with electric components and a desired electronic circuit formed thereon, and a circuit board provided separately from the circuit board. A dielectric substrate having first, second, and third center conductors that partially cross each other in the vertical direction, magnets disposed above and below the crossing portions of these center conductors, ferrite, and the magnet A first yoke that covers the outside of the
A circulator having a second yoke that covers the outside of the ferrite, wherein the dielectric substrate is
Each of the second and third center conductors is laminated with a dielectric interposed therebetween, and the first and second central conductors are stacked in a first recess provided in the circuit board. , An electronic circuit unit having a circulator, wherein second, third central conductors are connected to the conductive pattern. 2. The electronic circuit unit having a circulator according to claim 1, wherein the dielectric substrate is formed by alternately stacking the center conductor and the dielectric on an insulating thin plate. . 3. An electronic circuit unit having a circulator according to claim 2, wherein both ends of said first, second and third central conductors are formed so as to be exposed on a surface of said insulating thin plate. . 4. An electronic circuit unit comprising a circulator according to claim 1, wherein said first, second, and third center conductors are formed of two conductors. 5. The circuit according to claim 1, wherein said magnet is disposed above said dielectric substrate, said ferrite is disposed below said dielectric substrate, and said circuit board is provided at a position near said magnet. The circulator according to any one of claims 1 to 4, wherein the first or second yoke is inserted through the hole, and the first and second yokes constitute a magnetic closed circuit. Electronic circuit unit equipped with. 6. The circuit board has a second concave portion formed at a lower portion connected to the first concave portion located at an upper portion, and the ferrite is housed in the second concave portion. An electronic circuit unit comprising the circulator according to any one of claims 1 to 5. 7. One end of each of the first, second, and third center conductors is connected to the conductive pattern, and the other end of the first, second, and third center conductors is connected to the circuit board. Through the through-hole conductor filled in the hole provided in the
The electronic circuit unit comprising the circulator according to claim 1, wherein the electronic circuit unit is connected to the second yoke and grounded.