JPH04345201A - Irreversible circuit component and center conductor for irreversible circuit component - Google Patents

Abstract

PURPOSE:To realize the center conductor for an irreversible circuit component and the irreversible circuit component with an excellent high frequency characteristic by decreasing an inductance component and a DC resistance of a strip conductor without making the circuit scale large. CONSTITUTION:The center conductor for the irreversible circuit component has three strip conductors crossing each other at an angle of nearly 120 deg.. Plural sets of three strip conductors are provided as a set of strip conductors 110-130 and a set 2 of strip conductors 210-230. The sets 1, 2 are laminated via an electric insulation layer 3 and connected electrically in parallel with each other.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a center conductor for a lumped constant type non-reciprocal circuit element used as an isolator or a circulator, and includes a plurality of sets of three strip conductors, each set being laminated with an electrically insulating layer in between. By electrically connecting them in parallel to each other, the inductance component and DC resistance of the strip conductors can be reduced without increasing the plane area occupied by the strip conductors or increasing their size, creating a non-reciprocal circuit with excellent high frequency characteristics. It is possible to provide a center conductor for an element and a non-reciprocal circuit element.

0002

2. Description of the Related Art Conventional technologies for this type of non-reciprocal circuit element include, for example, Utility Model Application No. 62-127107 and Utility Model Application No. 56
2-2603 and Utility Model Application Publication No. 2-23104 are known. Its general configuration is to place a magnetic material such as garnet or ferrite on both sides of a central conductor for a non-reciprocal circuit element provided on a single board, and then place a permanent magnet on the outside of that to place a DC magnetic field. is applied vertically. The center conductor for a non-reciprocal circuit element includes three strip conductors arranged to cross each other at an angle of 120 degrees on one substrate.

0003

[Problems to be Solved by the Invention] However, conventional nonreciprocal circuit elements have the following problems. (A) The frequency range of this type of non-reciprocal circuit element is 1.5
There is a shift from GHz to a high frequency region such as 2.4 GHz. Therefore, in the conventional center conductor in which three strip conductors are formed on one substrate, the inductance component in the high frequency range used becomes large, and the characteristics deteriorate. (B) Irreciprocal circuit elements have important uses in car phones and cordless phones, and their miniaturization is extremely important. Conventionally, measures to reduce the size include narrowing the spacing between strip conductors or narrowing the width of the strip conductors. However, the spacing between the strip conductors cannot be reduced below the dimension required to ensure the creepage distance. On the other hand, if the width of the strip conductor is made smaller, the inductance component and the DC resistance value will further increase in a high frequency region such as 2.4 GHz, making it difficult to obtain satisfactory characteristics. For this reason, it has been difficult to improve high frequency characteristics while achieving miniaturization.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional problems, to reduce the inductance component and DC resistance value of a strip conductor without increasing the size, and to provide a nonreciprocal circuit element with excellent high frequency characteristics. An object of the present invention is to provide a central conductor and a nonreciprocal circuit element for use in the present invention.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a center conductor for a nonreciprocal circuit element having three strip conductors that intersect with each other at an angle of about 120 degrees, wherein the three strips A plurality of sets of conductors are provided, each set is laminated with an electrically insulating layer interposed therebetween, and is electrically connected to each other in parallel.

[0006]

[Function] Multiple sets of three strip conductors are provided, and each set is laminated with an electrically insulating layer in between and electrically connected to each other in parallel, which increases the planar area occupied by the strip conductors and increases the size of the strip conductors. It is possible to reduce the inductance component and DC resistance value of the strip conductor and improve the high frequency characteristics without causing any damage.

[0007]

[Example] Fig. 1 is a front view of a center conductor for a non-reciprocal circuit element according to the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is an A of Fig. 1.
1-A1 line cross-sectional view, Figure 4 is A2-A2 in Figure 1
It is a sectional view on the line. In the figure, 1 is a first strip conductor set, 2 is a second strip conductor set, 3 is an insulating layer, 41 to 46 are through conductors, 51 to 56 are through conductors,
61 to 64 are through conductors which also serve as holes for attaching external connection terminals, and 71 to 73 are through holes. The first strip conductor set 1 is configured by providing an insulating substrate 100 with three strip conductors 110 to 130 that intersect with each other at an angle of about 120 degrees. The second strip conductor set 2 also
Just like the strip conductor set 1, three strip conductors 210 to 230 are provided on an insulating substrate 200, intersecting each other at an angle of about 120 degrees. Although the illustration shows an example of two combinations of the first strip conductor set 1 and the second strip conductor set 2, more combinations are possible.

Strip conductors 110 to 130 constituting the first strip conductor set 1 and strip conductors 210 to 230 constituting the second strip conductor set 2 are laminated with an insulating layer 3 in between and are electrically parallel to each other. It is connected to the. Therefore, as a whole of the center conductor, the strip conductor 1
10 and the strip conductor 210, the strip conductor 120 and the strip conductor 220, and the strip conductor 130 and the strip conductor 230 are electrically connected in parallel to each other. Therefore, the cross-sectional area of the strip conductor constituting the center conductor increases in proportion to the number of layers, the inductance component and DC resistance value decrease, and high frequency characteristics improve.

Furthermore, since the strip conductors 110 to 130 and the strip conductors 210 to 230 are laminated with the insulating layer 3 in between, although the thickness increases slightly, the planar area occupied hardly increases. If the operating frequency is relatively low and there is no need to reduce the inductance component and DC resistance value, the conductor widths of the strip conductors 110 to 130 and the strip conductors 210 to 230 or the spacing between the strip conductors can be reduced. Miniaturization becomes possible.

Each of the strip conductors 110 to 130 is arranged in two parts on the front and back surfaces of the substrate 100, and divided pieces 111-112, 121-122 and 131-13 are arranged on the front and back sides of the substrate 100.
2-132 are electrically connected by through conductors 41-46. For example, focusing on the strip conductor 110, there is a divided piece 111 on the front side of the board 100 and a divided piece 112 on the back side.
A through conductor 41 is inserted between both divided pieces 111 and 112.
, 42. Other strip conductor 120
, 130 are also the same, with a divided piece 121 or 131 on the front side of the substrate 100 and a divided piece 122 or 13 on the back side.
The strip conductor 130 is divided into two parts and connected by through conductors 43 and 44.
They are connected by through conductors 45 and 46.

Similarly to the strip conductors 110 to 130, the strip conductors 210 to 230 are arranged in two parts on the front and back surfaces of the substrate 20, and divided pieces 211 to 212, 22
1-222 and 231-232 are electrically connected by through conductors 51-56. Divided pieces 212, 222, 232
has the same arrangement pattern as in FIG.

The strip conductor 110 and the strip conductor 210 are electrically connected by the through conductors 61 and 62, the strip conductor 120 and the strip conductor 220 are connected by the through conductor 63, and the strip conductor 130 and the strip conductor 230 are connected by the through conductor 64. Connected for continuity. Thereby, the first strip conductor set 1 and the second strip conductor set 2 are electrically connected in parallel via the insulating layer 3.

Each of the strip conductors 110 to 130 and the strip conductors 210 to 230 is arranged such that a portion adjacent to a land formed around a through conductor in another strip conductor maintains a predetermined distance from the land. It has a curved arc shape. Therefore, strip conductors 110-130 and strip conductors 210-23
It is possible to ensure a sufficient creepage distance between the land and other strip conductors while making the overall arrangement of the conductor 0 more compact.

FIG. 5 is a front view showing another embodiment of the center conductor for a non-reciprocal circuit element according to the present invention, FIG. 6 is a plan view thereof or a sectional view taken along line A5--A5 in FIG. 5, and FIG. 5 is a sectional view taken along the line A3-A3 or the line A6-A6, and FIG. 8 is a sectional view taken along the line A4-A4 or the line A7-A7 in FIG. This embodiment shows an example in which each strip conductor is separated and formed on a substrate, and the substrates are sequentially laminated. First, the first strip conductor set 1
is a substrate 101 on which strip conductors 110 are formed (FIG. 6).
), the substrate 102 (see FIG. 7) on which the strip conductor 12 is formed, and the substrate 103 (see FIG. 8) on which the strip conductor 130 is formed,
They are sequentially stacked so that they intersect with each other at an angle of 120 degrees. The second strip conductor set 2 also includes strip conductors 2
1 (see FIG. 6), a substrate 202 (see FIG. 7) on which the strip conductor 22 is formed, and a substrate 203 (see FIG. 8) on which the strip conductor 23 is formed. They are sequentially stacked so that they intersect at an angle of 120 degrees. Three strip conductors 110 constituting the first strip conductor set 1
130 and the three strip conductors 210 to 230 constituting the second strip conductor set 2 are connected to the through conductors 61 to 6.
4, they are electrically connected in parallel to each other. The strip conductors 110-130, 210-230 are laminated using the substrates 101-103, 201-203 that support them as electrically insulating layers.

FIG. 9 is an exploded perspective view of a nonreciprocal circuit element according to the present invention, and FIG. 10 is a cross-sectional view of the nonreciprocal circuit element in an assembled state. The embodiment shows an example of a non-reciprocal circuit element used as an isolator. In the figure, 8 is a laminate, 9 is a shield conductor, 10 is a circuit board, 11 is a magnet, and 12
is a magnetic material, 13 is a case, 14 is a lid, 15 is a figure 1 to figure 8
Center conductor for irreversible circuit element according to the present invention explained in 1
61 and 162 are external connection terminals.

The laminate 8 includes capacitor layers 801 to 803.
It is constructed by laminating layers, and has grounding conductors 81 and 82 on both sides in the lamination direction, respectively. capacitor layer 8
When layering 01 to 803, grounding conductors 81 and 82
are electrically connected to each other by a through conductor 83 penetrating the stacked body 8 in the stacking direction. The laminate 8 can be constructed of, for example, a glass-based fluororesin copper-clad laminate. Penetrating conductor 8
3 can be formed by plating the through holes previously provided in the above-mentioned laminate.

The shield conductor 9 is constructed using a thin copper plate or the like. There are three protrusions 9 around the shield conductor 9.
1 to 93 are erected.

A hole 181 into which the magnetic material 12 is inserted is provided in the center of the circuit board 10, and conductive patterns 182 to 185 are provided on the surface thereof. The circuit board 10 is made of an alumina substrate, a dielectric substrate, or the like. The circuit board 10 also includes a resistor 1 that terminates one of the strip conductors included in the center conductor 15.
89 are provided. Resistor 189 is typically constructed from a printed resistor. Without resistor 189, resistor 1
A circulator can be obtained by connecting the strip conductor that was terminated at 89 to the newly provided terminal.

During assembly, the grounding conductor 81 provided on one surface of the laminate 8 is brought into contact with the bottom surface of the case 1 to be grounded, and a shield conductor is connected to the grounding conductor 82 provided on the other surface. 9. Place the circuit board 10, the magnetic material 12 inserted into the hole 181, and the center conductor 15 in a predetermined positional relationship. The protrusions 91 to 93 of the shield conductor 9 are connected to the circuit board 10
The hole 71 provided in the center conductor 15 passes through the hole 181 of
73 and lead out, and its tip is bent and fixed on the center conductor 15.

The center conductor 15 has the structure described in FIGS. 1 to 4. Therefore, the first strip conductor set 1 and the second strip conductor set 2 are electrically connected in parallel via the insulating layer 3, and the inductance component and DC resistance of the strip conductors can be reduced without increasing the size. It is possible to obtain a non-reciprocal circuit element with reduced value and improved high frequency characteristics. Although not shown, the center conductor shown in FIGS. 5 to 8 may be used.

The shield conductor 9 contacts and conducts with the grounding conductor 82 provided on the surface of the laminate 8, and is electrically conductive from the grounding conductor 82 through the through conductor 83 to the grounding conductor 81 on the back side. It is connected and grounded to the case 13 via the grounding conductor 81. Therefore, there is no need to provide holes in the laminate 8, and the area of the laminate 8 is utilized to the maximum for obtaining capacitance in the capacitor layers 801 to 803.
Compatible with downsizing. As a specific example, conventionally the limit was 15 mm square to 20 mm square, but according to this embodiment, 1
We were able to reduce the area to less than 0 mm square, which is less than 1/3 of the conventional footprint.

FIGS. 11 to 14 show the laminated structure of the laminated body 8. FIG. FIG. 11 is a plan view of the laminate 8 viewed from the front side, in which a grounding conductor 82 is formed on the surface of a dielectric layer 841 made of a dielectric substrate such as a glass-based fluororesin. Penetration conductors 851 to 853 penetrate the dielectric layer 891, and can be formed by plating similarly to the penetration conductor 83.

FIG. 12 shows a dielectric layer 841 and a dielectric layer 842.
It shows the capacitor electrode pattern located between. 861 to 863 are capacitor electrodes. Capacitor electrodes 861 to 863 are connected to through conductors 851 to 8, respectively.
53 to the surface side of the dielectric layer 841 (see FIG. 11).

FIG. 13 shows dielectric layer 842 and dielectric layer 843.
This shows the capacitor electrode pattern located between. 86
4 to 866 are capacitor electrodes. Capacitor electrode 8
64 faces the capacitor electrode 851, and the dielectric layer 842
It is electrically connected to a capacitor electrode 852 by a through conductor 852 that is a through conductor. The capacitor electrode 865 faces the capacitor electrode 852 and is connected to the capacitor electrode 863 by a through conductor 853 that penetrates the dielectric layer 842.
is electrically connected. Capacitor electrode 866 faces capacitor electrode 863 and is electrically connected to capacitor electrode 851 through a through conductor 851 that extends through dielectric layer 842 .

FIG. 14 is a view of the laminate 8 seen from the back side.
A grounding conductor 81 formed on the back surface of dielectric layer 843 is shown.

FIG. 15 is a developed diagram used to show an electrical equivalent circuit of the laminate 8 having the structure shown in FIGS. 11 to 14. a, b, and c indicate terminals formed by through conductors 851, 852, and 853. terminal a
-b between capacitor electrode 861 and capacitor electrode 864
An inter-terminal capacitance C11 is formed between the terminals b and C, an inter-terminal capacitance C12 is formed between the terminals b and C due to the capacitor electrode 862 and the capacitor electrode 865, and an inter-terminal capacitance C12 is formed between the terminals ca and a due to the capacitor electrode 863 and the capacitor electrode 866. C13 is formed. In addition, grounding conductors 81, 82 and capacitor electrodes (861, 866), (862, 864)
Ground capacitance C01, C0 between and (863, 865)
2 and C03 are formed, respectively.

FIG. 16 shows a circuit diagram of a circulator using the laminated bodies shown in FIGS. 11 to 15, in which an inter-terminal capacitance C11 is connected between terminals a and b, and an inter-terminal capacitance C12 is connected between terminals b and C. , and connect an inter-terminal capacitance C13 between terminals ca and a, and connect a ground capacitance C13 to each of terminals a, b, and c.
A circuit in which 01, C02, and C03 are respectively connected is obtained.

FIGS. 17 to 21 are diagrams showing other embodiments of the laminate 8. FIGS. In the figures, the same reference numerals as in FIGS. 11 to 14 indicate the same components. FIG. 17 is a plan view of the surface of the laminate, showing capacitor electrodes 871 to 873 and relay electrodes 874 to 87 on the surface of the dielectric layer 840.
6. A grounding conductor 82 is formed on the surface of the dielectric layer 840.

FIG. 18 shows a dielectric layer 840 and a dielectric layer 841.
The arrangement pattern of capacitor electrodes 877 to 879 located between is shown. Capacitor electrode 877 faces capacitor electrode 871 via dielectric layer 840 and is electrically connected to relay electrode 874 through a through conductor 851 that extends through dielectric layer 840 . Capacitor electrode 8
78 faces the capacitor electrode 872 via the dielectric layer 840, and is electrically connected to the relay electrode 875 through a through conductor 852 that extends through the dielectric layer 840. The capacitor electrode 879 faces the capacitor electrode 873 via the dielectric layer 840 and is electrically connected to the relay electrode 876 by a through conductor 853 that extends through the dielectric layer 840 .

FIGS. 19 to 21 show capacitor electrodes 851 to
866 arrangement pattern is shown. Substantially, FIG.
- Since it is the same as FIG. 14, the explanation will be omitted.

FIG. 22 shows the laminate 8 shown in FIGS. 17 to 21.
FIG. 2 is a developed diagram showing an electrical equivalent circuit of FIG. In the figure, the same reference numerals as in FIG. 15 indicate the same components, and in addition to the inter-terminal capacitance C11 to C13 and the ground capacitance C01 to C03, the series capacitance C due to capacitor electrodes 871 to 874
21. Series capacitance C due to capacitor electrodes 872-875
22. Series capacitance C due to capacitor electrodes 873-876
23 is added to the circuit configuration.

FIG. 23 shows a circuit diagram of a circulator using the laminate shown in FIGS. 17 to 22. terminal a2
-b2, connect the inter-terminal capacitance C11 between the terminals b2 and
-c2, and connect terminal capacitance C13 between terminals c2 and a2.
2, b2, and c2, respectively, have grounding capacitances C01 and C01.
A circuit configuration is obtained in which series capacitance C21 by capacitor electrodes 871-874, series capacitance C22 by capacitor electrodes 872-875, and series capacitance C23 by capacitor electrodes 873-876 are added to the circuit in which capacitor electrodes 871-874 are connected. Although not shown, terminal a1
, b1, and c1 can also be provided with external inductances.

[0033]

As described above, the present invention provides a center conductor for a non-reciprocal circuit element having three strip conductors intersecting each other at an angle of approximately 120 degrees, and a non-reciprocal circuit element having this center conductor. , multiple sets of three strip conductors are provided, and each set is laminated with an electrically insulating layer in between and electrically connected to each other in parallel, so that the inductance component of the strip conductor can be reduced without increasing the size. It is also possible to provide a center conductor for a non-reciprocal circuit element and a non-reciprocal circuit element with a reduced DC resistance value and excellent high frequency characteristics.

[Brief explanation of the drawing]

FIG. 1 is a front view of a center conductor for a non-reciprocal circuit element according to the present invention.

FIG. 2 is a plan view of a center conductor for a non-reciprocal circuit element according to the present invention.

FIG. 3 is a sectional view taken along line A1-A1 in FIG. 1;

4 is a sectional view taken along line A2-A2 in FIG. 1. FIG.

FIG. 5 is a front view showing another embodiment of the center conductor for a non-reciprocal circuit element according to the present invention.

6 is a plan view or a sectional view taken along line A5-A5 in FIG. 5 of the center conductor for a non-reciprocal circuit element shown in FIG. 5; FIG.

7 is a sectional view taken along line A3-A3 or line A6-A6 in FIG. 5. FIG.

8 is a cross-sectional view taken along line A4-A4 or line A7-A7 in FIG. 5. FIG.

FIG. 9 is an exploded perspective view of a nonreciprocal circuit element according to the present invention.

FIG. 10 is a sectional view of the nonreciprocal circuit element according to the present invention in an assembled state.

FIG. 11 is a plan view of a laminate to be incorporated into a non-reciprocal circuit element according to the present invention, viewed from the front side.

FIG. 12 is a diagram showing a capacitor electrode pattern of a laminate incorporated into a non-reciprocal circuit element according to the present invention.

FIG. 13 is a diagram showing a capacitor electrode pattern of a laminate incorporated into a non-reciprocal circuit element according to the present invention.

FIG. 14 is a diagram of a laminate to be incorporated into a non-reciprocal circuit element according to the present invention, viewed from the back side.

FIG. 15 is a developed diagram used to show an electrical equivalent circuit of the laminate shown in FIGS. 11 to 14;

16 is a diagram showing a circuit diagram of a circulator using the laminate shown in FIGS. 11 to 15. FIG.

FIG. 17 is a plan view showing another embodiment of a laminate incorporated into a non-reciprocal circuit element according to the present invention.

18 is a diagram showing an arrangement pattern of capacitor electrodes in the laminate shown in FIG. 17. FIG.

19 is a diagram showing an arrangement pattern of capacitor electrodes in the laminate shown in FIG. 17. FIG.

FIG. 20 is a diagram showing an arrangement pattern of capacitor electrodes in the laminate shown in FIG. 17;

21 is a diagram showing an arrangement pattern of capacitor electrodes of the laminate shown in FIG. 17. FIG.

FIG. 22 is a developed diagram showing an electrical equivalent circuit of the laminate shown in FIGS. 17 to 21. FIG.

23 is a circuit diagram of a circulator using the laminate shown in FIGS. 17 to 22. FIG.

[Explanation of symbols]

Claims (7)

[Claims] [Claim 1] 3 intersecting each other at an angle of about 120 degrees
A center conductor for a non-reciprocal circuit element having two strip conductors, the three strip conductors being provided in plural sets, each set being laminated with an electrically insulating layer interposed therebetween and electrically connected to each other in parallel. A center conductor for a non-reciprocal circuit element. 2. In each set, each of the strip conductors is arranged in two parts on the front surface and the back surface of the board, and the divided pieces are electrically connected by a through conductor. Center conductor for non-reciprocal circuit elements. 3. The nonreciprocal circuit element according to claim 1, wherein each of the sets is laminated with an insulating plate interposed therebetween and electrically connected to each other through a through conductor provided in the insulating plate. center conductor. 4. The three strip conductors of each set are:
2. The center conductor for a non-reciprocal circuit element according to claim 1, wherein each strip conductor is formed on a different substrate and laminated. 5. A non-reciprocal circuit element comprising a center conductor for a non-reciprocal circuit element, a magnetic body disposed to face the center conductor for a non-reciprocal circuit element, and a permanent magnet disposed outside the magnetic body. The center conductor for the non-reciprocal circuit element is
It has three strip conductors that intersect with each other at an angle of approximately 120 degrees, and a plurality of sets of the three strip conductors are provided, and each set is laminated with an electrically insulating layer interposed therebetween and electrically connected to each other in parallel. A non-reciprocal circuit element characterized by: 6. A capacitor is connected to each terminal of the strip conductor, and the capacitor is configured as a laminate of a plurality of capacitor layers, and the laminate has a grounding conductor on each of both sides in the stacking direction. 6. The nonreciprocal circuit element according to claim 5, wherein the nonreciprocal circuit element has a conductor, and the grounding conductor is electrically connected to each other by a through conductor that penetrates in the lamination direction. 7. The capacitor includes at least one of a capacitor connected between terminals of the strip conductor and a capacitor connected between a terminal of the strip conductor and an installation. 6. The irreversible circuit element according to 6.