KR20190101022A - Non-reciprocal Circuit Element - Google Patents

Abstract

The present invention relates to a method for designing and configuring non-reciprocal circuit devices, such as an isolator and a circulator. The purpose of the present invention is to simplify an internal structure of the non-reciprocal circuit devices and improve electrical performance such as distribution of characteristics and the like, so that the method for designing and configuring non-reciprocal circuit devices is suitable for miniaturization and surface mount technology. In the non-reciprocal circuit devices, a main substrate having various chip components mounted therein is disposed in an upper case and a lower case, and ferrite is inserted into an opening of a center portion of the main substrate. An input/output terminal is formed at the outer portion of the main substrate and protrudes downward compared to an inner portion. A center conductor substrate is positioned in contact with the ferrite on the upper surface of the ferrite and is electrically connected to the main substrate. In addition, a lower case is disposed at the lower surface of the ferrite to form a ground surface of the ferrite. The lower case is assembled with the upper case to form a closed magnetic field circuit. In order to apply a static magnetic field to the ferrite, a permanent magnet is magnetically bonded to the upper case and disposed at a predetermined interval from an upper portion of the center conductor substrate.

Description

Non-reciprocal Circuit Element

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an irreversible circuit element, and more particularly, to a non-reciprocal circuit element, which is applied to a surface mounting technique and has improved productivity, reliability, and electrical characteristics.

Non-reciprocal circuit elements, such as circulators and isolators, generally have a signal input through a predetermined port and rotate in one direction according to Faraday rotation. It is a high frequency communication component designed to be delivered to another predetermined port.

In the case of a circulator, it usually has three ports, and the signal input from each port is usually designed to be transmitted to another adjacent port with the same transfer coefficient and reflection coefficient. Accordingly, each port may be an input port and an output port having directivity with respect to an adjacent port.

On the other hand, in the case of the isolator, by connecting a termination resistor to one of the three ports, each port is designed to play only one role. In other words, the signal entered through the input port is transmitted through the output port, and the signal entered through the output port is transmitted to the termination port to which the termination resistor is connected and is destroyed. Therefore, in the case of an ideal isolator, the signal input from the output port is cut off without being transferred to the input port.

In general, isolators and circulators are located between the power amplifier and the antenna in the transmitting end of the wireless communication device, and help the signal amplified from the power amplifier to be transmitted with little loss toward the antenna. It blocks the signal from returning from the antenna or unwanted signal to the power amplifier.

As the demand for wireless communication and the development of communication technology increase, demand for communication equipment increases and price competition intensifies. In addition, the application of surface mount technology is increasing in order to improve the productivity of communication equipment, the demand for miniaturization is increasing. Even in the case of the above irreversible circuit element, the demand for surface mount type products has been steadily increasing. Accordingly, studies of techniques for improving the mountability using a low material cost have been steadily progressing.

8 shows an irreversible circuit element according to the prior art.

That is, FIG. 8 is a representative view of Murata's patent US2015 / 0061788 (hereinafter, Patent 1).

The patent 1 is an invention in which a ferrite-center conductor assembly machine is implemented using a lamination technology such as LTCC. However, the invention of the patent 2 has the following problems.

First, the sintering temperature of the ferrite should be lowered for the LTCC stacking, and there is a problem that the added materials deteriorate the electrical properties of the ferrite.

In addition, in the structure in which the permanent magnet is directly abutted on the ferrite-center conductor assembly machine, there is a problem that the dielectric loss and the magnetic loss of the permanent magnet deteriorate the electrical characteristics of the irreversible circuit element.

In addition, since it is difficult to magnetically shield the lower side of the ferrite, first, it is difficult to obtain excellent electrical characteristics, and second, there is a problem that is sensitive to external magnetic field changes.

In order to solve the above problems, the present invention is applied to the surface mount technology (Surface Mount Technology), non-reversible circuit elements (isolator and circulator) improved productivity, reliability and electrical properties compared to the prior art Etc.).

According to an aspect of the present invention, a non-reciprocal circuit device includes a main board including (1) a component mounting unit (169) and (2) bottom protruding parts (164 and 165) located at the lateral side of the component mounting unit ( 160); And a lower case 111 coupled to a bottom surface of the component mounting part, wherein the bottom protrusion protrudes downward from the lower surface of the component mounting part. Input and output terminals 161 and 162 may be formed on the bottom surface of the bottom protrusion.

At this time, the upper case 110 and the permanent magnet 120, the central conductor substrate 130, the ferrite 150 disposed between the upper case and the lower case constituting the path of the circulating magnetic circuit together with the lower case, and The electrode plate 151 may further include.

In this case, the lower side surface of the input / output terminal may protrude further downward from the component mounting portion than any point of the lower case.

In this case, an opening 163 is formed in the center of the component mounting part, and the upper case 110 constituting the path of the circulating magnetic circuit together with the lower case, the ferrite 150 inserted into the opening, and the image of the ferrite. Located in contact with each other on the side, the central conductor substrate 130 is electrically connected to the main substrate, and a predetermined distance away from the upper side of the central conductor substrate, magnetically attached to the upper case to provide a static magnetic field to the ferrite Permanent magnet 120 may be further included.

In this case, a plurality of center conductors 131, 132, and 133 are formed, and further comprising a center conductor substrate 130 having a multi-layer structure, wherein the plurality of center conductors are different layers of the center conductor substrate 130. The plurality of center conductors may cross each other at a predetermined angle.

In this case, connection terminals electrically connected to the plurality of center conductors are disposed on a lower side of the central conductor substrate, and the connection terminals may be electrically connected to a circuit formed on an upper surface of the component mounting unit.

In this case, the center conductor substrate may include a flexible circuit board.

Alternatively, an opening 163 may be formed in the center of the component mounting part, and the pole plate and the permanent magnet may be inserted together with the ferrite in the opening.

Alternatively, the upper case 110 together with the lower case constitutes a path of a circulating magnetic circuit, a center conductor substrate 130 disposed between the upper case and the lower case, and abuts on an upper side of the center conductor substrate. And a first ferrite 150, a second ferrite 151 disposed in contact with a lower surface of the center conductor substrate, and a ground conductor 152 electrically connected to the second ferrite 151. The conductor substrate, the first ferrite, and the second ferrite may together provide a stripline structure.

According to the present invention, in the construction of irreversible circuit elements such as isolators and circulators, the process of making a ferrite-center conductor assembly integrating the ferrite and the center conductor together is eliminated, thereby simplifying the manufacturing process. It is effective in reducing the dispersion of product performance.

In addition, according to the present invention, by designing a main substrate with a step using a general-purpose general-purpose multilayer board, the manufacturing of the main board is simplified, it is possible to apply the lower case for the configuration of the circulating magnetic circuit with the upper case There is an effect.

1 is an exploded view of an irreversible circuit element 100 designed according to one embodiment of the invention.
2 is an equivalent circuit of the simple type irreversible circuit device 110 according to an embodiment of the present invention.
3 is a cross-sectional view of an irreversible circuit device according to an embodiment of the present invention.
4 is an exploded view of the central conductor substrate 130 according to the embodiment of the present invention.
5 is an exploded view of an irreversible circuit element designed according to another embodiment of the present invention.
6 is a cross-sectional view of an irreversible circuit device according to another embodiment of the present invention.
7 is an exploded view of an irreversible circuit element designed according to another embodiment of the present invention.
8 shows an irreversible circuit element according to the prior art.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described. However, the present invention is not limited to the embodiments described herein and may be implemented in various other forms. The terminology used herein is for the purpose of understanding the embodiments and is not intended to limit the scope of the invention. Also, the singular forms used below include the plural forms unless the phrases clearly indicate the opposite meanings.

1 is an exploded view of an irreversible circuit element 100 designed according to one embodiment of the invention.

The irreversible circuit device 100 includes an upper case 110, a lower case 111, a permanent magnet 120, a central conductor substrate 130, chip components 140, a ferrite 150, and a main body. It may include a substrate 160.

The upper case 110 and the lower case 111 may be made of a soft magnetic material.

The permanent magnet 120 may generate a static magnetic field.

The central conductor substrate 130 may be composed of a plurality of layers. In the central conductor substrate 130, a plurality of central conductors are insulated from and disposed on different layers. Each of the plurality of center conductors may extend in a predetermined direction, and the extension directions of the respective center conductors may be different from each other. The plurality of center conductors may be designed to cross each other at a predetermined angle.

For example, three different center conductors may be disposed on the center conductor substrate 130 to be insulated from each other in different layers in a form of crossing with each other having an angle of 120 degrees.

The main board 160 may include a component mounting unit 169 and bottom protrusions 164 and 165. The component mounting unit 169 and the bottom protrusions 164 and 165 may be considered to be different layers. In one embodiment, the bottom protrusions 164 and 165 may be disposed on the lateral part side of the component mounting unit 169 to protrude downward from the bottom surface of the component mounting unit 169 to form a step.

Input and output terminals may be disposed on the bottom surfaces of the bottom protrusions 164 and 165.

The chip parts 140 may be mounted on the main board 160, that is, on the component mounting unit 169.

The ferrite 150 may be inserted into the central opening of the main substrate 160. The ferrite 150 generates a Faraday Rotation phenomenon at a predetermined frequency by a static magnetic field generated from the permanent magnet 120, and together with the central conductor substrate 130, an inductance of a predetermined size. Generates.

In the main board 160, the bottom protrusions 164 and 165 on which the input / output terminals are formed may protrude downward from the lower surface 167 of the component mounting unit 169. The opening 163 may be formed in the center of the main board 160, that is, the center of the component mounting unit 169.

As described above, the plurality of chip components 140 are mounted on the main substrate 160, and in some cases, a chip capacitor, a chip inductor, and a chip resistor Etc. may be mounted.

In order to form a closed magnetic loop circuit, the upper case 110 and the lower case 111 are made of a soft magnetic material as described above, and the upper case 110 is formed of a lower case ( 111) to each other in a predetermined manner.

In addition, the lower case 111 may be coupled to the lower side of the component mounting unit 169 of the main board 160 by welding or soldering. In this case, as described above, the bottom protrusions 164 and 165 of the main board 160 protrude further downward than the lower surface 167 of the component mounting unit 169, and the lower case 111 is a component mounting unit ( It is mounted on the lower side 167 of 169 to form a ground plane. Accordingly, the input / output terminals 161 and 162 formed on the bottom protrusions 164 and 165 of the main board 160 are not affected by the thickness of the lower case 111, and are printed circuits that are different for the purpose through the surface mounting process. Can be soldered onto the substrate.

The width of the lower case 111 may be smaller than the width of the main substrate 160. That is, the width of the lower case 111 may be smaller than the width of the lower part 111 except for the area occupied by the bottom protrusions 164 and 165 of the component mounting part 169 of the main board 160. In this case, in the embodiment in which the thicknesses of the bottom protrusions 164 and 165 and the thickness of the lower case 111 are the same, the upper surface of the lower case 111 is the lower surface 167 of the component mounting unit 169. When coupled in contact with the bottom protrusions 164 and 165 and the wide bottom of the lower case 111 may be located at the same height.

 2 is an equivalent circuit of the simple type irreversible circuit device 110 according to an embodiment of the present invention.

As described above, the ferrite 150 generates a Faraday rotation phenomenon, and generates inductance of a predetermined size together with each of the center conductors 131, 132, and 133 of the center conductor substrate 130.

In addition, capacitors 141, 142, and 143 coupled to the inductance to generate resonance are connected in parallel to the respective center conductors 131, 132, and 133.

When the irreversible circuit element 100 is an isolator, one predetermined terminal is terminated with a resistor 144 or the like. The high frequency signal input from the input terminal 161 generates LC resonance in the center conductor 131 and the capacitor 141 designed according to the frequency, and generates a Faraday rotation on the ferrite 150. The rotated high frequency signal is resonated and transmitted from the adjacent center conductor 133 and the capacitor 143 and then output from the output terminal 162.

3 is a cross-sectional view of an irreversible circuit device according to an embodiment of the present invention.

As shown in FIG. 3, the irreversible circuit device includes an upper case 110, a permanent magnet 120, a central conductor substrate 130, chip components 140, ferrite 150, a main substrate 160, and a lower case. It can be comprised by arrange | positioning 111 in order.

The input / output terminals 161 and 162 may be disposed on lower surfaces of the bottom protrusions 164 and 165 of the main substrate 160, respectively. The input / output terminals 161 and 162 may be electrically connected to other parts of the main substrate 160 by vias (not shown) formed at the same position.

4 is an exploded view of the central conductor substrate 130 according to the embodiment of the present invention.

The plurality of center conductors 131, 132, and 133 may be insulated from and different from the dielectric substrate layers 134, 135, and 138. The plurality of center conductors 131, 132, and 133 may be designed to intersect at a predetermined angle.

In this case, the plurality of dielectric substrate layers 134, 135, and 138 may be made using a flexible printed circuit board, and a bonding film or a prepreg substrate 137, 138. ) Can be combined.

5 is an exploded view of an irreversible circuit element 100 designed according to another embodiment of the present invention.

The central conductor substrate 130 may be composed of a single central conductor 138 on the single dielectric substrate 137.

The wide surface of the central conductor substrate 130 may have a square shape as shown in FIG. 5 as a whole, but the present invention is not limited to this shape. In a modified embodiment, the wide surface of the central conductor substrate 130 may have other shapes, such as circular, hexagonal as a whole.

In this case, the center conductors 131, 132, and 133 are distributed element type resonators and impedance transformers, and are known in the Patent No. 10-1378740, in combination with chip components, and resonator sizes. Without a significant increase of, the function of lowering the resonant frequency of the resonator may also serve to reduce the size of the impedance converter.

6 is a cross-sectional view of an irreversible circuit device according to another embodiment of the present invention.

An opening (not shown) located in the center of the main board 160 (corresponding to the opening 163 of FIG. 1) includes a ferrite 150 and a pole plate 151 for uniformly distributing a static magnetic field to the ferrite. The second permanent magnet 152 may be sequentially positioned. Through this, the uniformity of the static magnetic field applied to the ferrite 150 may be improved.

7 is an exploded view of an irreversible circuit element 100 designed according to another embodiment of the present invention.

In addition to the embodiment described in FIG. 1, the embodiment may form a stripline structure together with the ferrites 150 and 151 positioned in contact with the upper and lower surfaces thereof, respectively. In order to complete the stripline structure, the ferrite 151 positioned at an upper side thereof may be grounded through one ground conductor 152.

The invention is not limited to the embodiments listed above, but may be constructed in accordance with the claims of the invention in various ways.

By using the embodiments of the present invention described above, those belonging to the technical field of the present invention will be able to easily make various changes and modifications without departing from the essential characteristics of the present invention. The content of each claim in the claims may be combined in another claim without citations within the scope of the claims.

Claims (9)

A main board including a component mounting part and a bottom protruding part located at an outer side of the component mounting part; And
A lower case coupled to a bottom surface of the component mounting part;
Including;
The bottom protrusion protrudes downward from the bottom surface of the component mounting part.
Input and output terminals are formed on the lower side of the bottom protrusion,
Irreversible circuit elements. The method of claim 1,
An upper case constituting a path of a circulating magnetic circuit together with the lower case;
A permanent magnet disposed between the upper case and the lower case;
Center conductor substrate;
ferrite; And
Plate
Including more;
Irreversible circuit elements. The irreversible circuit element according to claim 1, wherein the lower side of the input / output terminal protrudes further downward from the component mounting portion than any point of the lower case. The method of claim 1,
An opening is formed in the center of the component mounting portion,
An upper case constituting a path of a circulating magnetic circuit together with the lower case;
A ferrite inserted into the opening;
A center conductor substrate which is in contact with each other on the upper side of the ferrite, and is electrically connected to the main substrate; And
A permanent magnet positioned at a predetermined distance above the center conductor substrate and magnetically attached to the upper case to provide a static magnetic field to the ferrite;
Including more;
Irreversible circuit elements. The method of claim 1,
A plurality of center conductors are formed, further comprising a center conductor substrate having a multilayer structure,
The plurality of center conductors are arranged insulated from each other on different layers of the center conductor substrate,
The plurality of center conductors cross each other at a predetermined angle,
Irreversible circuit elements. The method of claim 5,
Connection terminals electrically connected to the plurality of center conductors are disposed on a lower side of the center conductor substrate.
The connection terminals are electrically connected to the circuit formed on the upper surface of the component mounting portion,
Irreversible circuit elements. 6. The irreversible circuit element according to claim 5, wherein the center conductor substrate comprises a flexible circuit board. The method of claim 2,
An opening is formed in the center of the component mounting portion,
The pole plate and the permanent magnet is inserted together with the ferrite in the opening,
Irreversible circuit elements. The method of claim 1,
An upper case constituting a path of a circulating magnetic circuit together with the lower case;
A center conductor substrate disposed between the upper case and the lower case;
A first ferrite disposed in contact with an upper surface of the center conductor substrate;
A second ferrite disposed in contact with a lower surface of the center conductor substrate; And
A ground conductor electrically connected to the second ferrite;
More,
The center conductor substrate, the first ferrite, and the second ferrite together provide a stripline structure,
Irreversible circuit elements.

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