JP7019477B2 - High frequency module - Google Patents

Description

The present invention relates to a high frequency module.

In Patent Document 1, the discontinuity of the ground in the transmission path of the microwave signal composed of the substrate and the connector housed in the housing is suppressed so as not to affect the signal, and the microwave signal of a desired level is obtained. A technique that enables output to the outside is disclosed.

Japanese Unexamined Patent Publication No. 2001-185254

By the way, in the technique disclosed in Patent Document 1, the connector is provided on the side surface of the housing. For this reason, for example, when a plurality of housings are housed in a larger housing and these housings are connected to each other with a connection cable via a connector, there is a problem that the connection work of the connection cable becomes difficult. There is.

An object of the present invention is to provide a high frequency module capable of simplifying the connection work of a connection cable.

In order to solve the above problems, the present invention comprises a signal circuit formed on the circuit board and transmitting an electric signal having a predetermined frequency in a high frequency module in which the circuit board is housed in a conductive housing, and the predetermined one. An input connector and an output connector into which an electric signal having a frequency of It is characterized by having a connection portion for connecting the ground of the connection cable and the housing.
With such a configuration, it is possible to simplify the connection work of the connection cable.

Further, the present invention is characterized in that the connection portion is configured as a member separate from the housing, and the ground of the connection cable and the housing are electrically connected.
According to such a configuration, since the connection portion can be attached later, workability can be improved.

Further, the present invention is characterized in that the connection portion is configured as a part of the housing, and the ground of the connection cable and the housing are electrically connected.
According to such a configuration, the manufacturing cost can be reduced by reducing the number of parts.

Further, in the present invention, the connection cable has a main body portion having the same potential as the ground of the coaxial cable constituting the connection cable, and the connection portion electrically connects the main body portion and the housing. It is characterized by doing.
According to such a configuration, the circuit can be stabilized and noise can be reduced by securely connecting the ground of the connection cable and the housing.

Further, the present invention is characterized in that the coaxial cable and the connector are arranged so as to be substantially orthogonal to the main body portion.
According to such a configuration, it is possible to facilitate the work of routing the coaxial cable and to simplify the configuration of the connection portion.

Further, the present invention is characterized in that the connection portion urges the main body portion in the direction of the input connector or the output connector.
With such a configuration, grounding can be made more reliable and the connection cable can be prevented from falling off.

Further, in the present invention, the circuit board has a substantially quadrangular shape when viewed from the normal direction, and the housing cuts out at least one apex of the substantially quadrangular shape when viewed from the normal direction. The input connector and the output connector are arranged in the vicinity of the apex.
According to such a configuration, workability can be improved by arranging the connector in the notch near the apex.

Further, in the present invention, the housing is configured to cut out at least two vertices located diagonally to each other in the substantially square shape when viewed from the normal direction, and the input connector and the output connector are provided with the same. It is characterized in that they are arranged in the vicinity of the two vertices located diagonally to each other.
According to such a configuration, it is possible to reduce the interference between the connection cables.

Further, in the present invention, the housing exposes at least one of the input connector and the output connector in the normal direction, and the covering portion that covers at least a part of the signal circuit from the normal direction. It is characterized by having an exposed portion.
According to such a configuration, workability can be improved by covering the signal circuit and exposing the connector.

Further, the present invention is characterized in that the connecting portion extends from the covering portion to the exposed portion and is arranged in the normal direction of at least one of the input connector and the output connector.
According to such a configuration, the connection between the connection portion and the connector can be more secure.

Further, the present invention is characterized in that the connection portion is arranged so as to cover at least one of the input connector and the output connector.
With such a configuration, it is possible to reduce the interference between the input connector and the connection connector.

According to the present invention, it is possible to provide a high frequency module capable of simplifying the connection work of the connection cable.

It is a figure which shows the structural example of the high frequency module which concerns on embodiment of this invention. It is a top view of the embodiment shown in FIG. It is a figure which shows the structural example of the circuit arranged on the circuit board shown in FIG. It is a figure which shows the configuration example of the connection cable. It is a figure which shows the state which the connection cable shown in FIG. 4 is connected. It is a figure which shows the structural example of the grounding member. It is a figure which shows the state which the grounding member shown in FIG. 6 is connected. It is a figure which shows the passing characteristic when the grounding member shown in FIG. 6 is not used. It is a figure which shows the passing characteristic when the grounding member shown in FIG. 6 is used. It is a figure which shows the other structural example of the grounding member. It is a figure which shows the state which the grounding member shown in FIG. 10 is connected. It is a figure which shows the other structural example of the grounding member. It is a figure which shows the state which the grounding member shown in FIG. 12 is connected. It is a figure which shows the other arrangement example of the input connector arrangement part.

Next, an embodiment of the present invention will be described.

(A) Explanation of the configuration of the embodiment of the present invention FIG. 1 is a perspective view showing a configuration example of a high frequency module according to the embodiment of the present invention, and FIG. 2 is a top view of the perspective view shown in FIG. .. As shown in FIGS. 1 and 2, the high-frequency module 10 according to the embodiment of the present invention includes a housing 11, a mounting portion 12, a power connector 13, an input connector arranging portion 14, an output connector arranging portion 15, and a feedback connector. It has an arrangement portion 16 and houses the circuit board 20 in the housing 11.

Here, the high frequency module 10 inputs, for example, a signal in the microwave band having a frequency of 1 GHz or more (hereinafter, simply referred to as “microwave signal”), and has, for example, a predetermined gain (for example, 40 dB to 60 dB). Amplify and output. The high-frequency module 10 is mounted in the accommodation box together with other high-frequency modules (not shown), and is connected to the other high-frequency modules by a connection cable described later.

The housing 11 has a bottom housing 111, a frame 112, and a lid 113, which are made of, for example, metal, a conductive resin, or the like, and house the circuit board 20. The bottom housing 111 is composed of, for example, a box-shaped conductive member having an open top, and a circuit board 20 is arranged inside. The frame 112 has notches corresponding to the input connector arranging portion 14, the output connector arranging portion 15, and the feedback connector arranging portion 16 formed in the lower left corner, the lower right corner, and the upper right corner, and is conductive with a predetermined thickness. It is composed of sex members. The lid portion 113 constitutes a covering portion that covers the circuit board 20 from the Z-axis direction by a conductive plate-shaped member arranged on the upper portion of the frame body 112. The bottom housing 111, the frame 112, and the lid 113 are fixed to each other by, for example, screws or the like to form the housing 11.

The mounting portion 12 is formed so as to protrude from the bottom housing 111, and a screw is inserted into a hole formed in the mounting portion 12 to be fixed to a storage box (not shown).

The power connector 13 is a terminal to which power power supplied from another module (power module) is supplied.

The input connector arranging portion 14 is composed of a notch portion of the frame body 112 formed so as to cut out a corner of a rectangle. The portion where the input connector 141 of the circuit board 20 is arranged is exposed. In this way, the cutout portion constitutes an exposed portion.

The output connector arranging portion 15 is formed by a notch portion of the frame body 112 formed so as to cut out a corner of a rectangle, and is a portion where a portion of the circuit board 20 in which the output connector 151 is arranged is exposed. In this way, the cutout portion constitutes an exposed portion.

The feedback connector arranging portion 16 is composed of a notch portion of the frame body 112 formed so as to cut out the corners of the rectangle, and is a portion where the portion of the circuit board 20 in which the feedback connector 161 is arranged is exposed.

FIG. 3 is a diagram showing an example of a circuit formed on the circuit board 20 housed in the housing 11. In the example of FIG. 3, the circuit board 20 is provided with an input circuit 21, a power supply circuit 22, an amplifier circuit 23, an output circuit 24, and a feedback circuit 25 so as to have a substantially quadrangular shape when viewed from the Z-axis direction. It is configured in.

Here, the input circuit 21 is a circuit that inputs a microwave signal from the input connector 141 and supplies it to the amplifier circuit 23.

The power supply circuit 22 is a circuit that converts the power supply power supplied from another module (power supply module) via the power supply connector 13 into a predetermined voltage and controls the voltage to be constant.

The amplifier circuit 23 is a high-frequency amplifier circuit that amplifies the microwave signal supplied from the input circuit 21 with a predetermined gain (for example, 40 dB to 60 dB) and supplies it to the output circuit 24 and the feedback circuit 25.

The output circuit 24 is a circuit having an isolator or the like that supplies the microwave signal amplified by the amplifier circuit 23 to another high frequency module via the output connector 151 and attenuates the reflected signal from the other high frequency module. ..

The feedback circuit 25 is, for example, a circuit that distributes the microwave signal output from the amplifier circuit 23 and supplies it to another high frequency module via the feedback connector 161.

FIG. 4 is an enlarged view showing the input connector arrangement portion 14 shown in FIG. 1. As shown in FIG. 4, a portion of the circuit board 20 in which the input connector 141 is arranged is exposed in the input connector arrangement portion 14. The input connector 141 is arranged so that the male connector faces the direction perpendicular to the mounting surface of the circuit board 20. The input connector 141 is configured by arranging a conductive wire rod (center contact) in the center of a cylindrical conductive member. The cylindrical conductive member and the conductive wire in the center are insulated from each other. The cylindrical conductive member is a ground terminal and is connected to the ground of the circuit board 20. A microwave signal is supplied to the conductive wire rod in the central portion, and is supplied to the amplifier circuit 23 via the input circuit 22.

As shown on the upper side of FIG. 4, another high frequency module (not shown) is connected to the input connector 141 by the connection cable 30. As shown in FIG. 4, the connection cable 30 has a main body portion 31, a connector portion 32, a coaxial cable insertion portion 33, a recess 34, and a coaxial cable 35. The connection cable 30 is configured to be detachably attached to and from the input connector 141 from the normal direction of the circuit board 20 (Z-axis direction in FIG. 4).

Here, the main body portion 31 is formed of, for example, a conductive member such as metal, a connector portion 32 is formed on one surface, a recess 34 is formed on a surface facing the connector portion 32, and the connector portion 32 is formed. A coaxial cable insertion portion 33 is formed on a surface substantially orthogonal to the surface on which the is formed.

The connector portion 32 is a female connector and has a cylindrical conductive member having a diameter larger than that of the cylindrical conductive member of the input connector 141. Further, at the center of the cylindrical member, a tubular member into which the wire rod of the input connector 141 is inserted is arranged. When the connector portion 32 is connected to the input connector 141, the wire rod at the center of the input connector 141 and the cylindrical member at the center of the connector portion 32 are electrically connected, and the cylindrical member of the input connector 141 and the cylindrical member The outer cylindrical member of the connector portion 32 is electrically connected.

The coaxial cable 35 is inserted through the coaxial cable insertion portion 33. The concave portion 34 is formed in the upper part of the main body portion 31, and the convex portion 45 of the grounding member 40, which will be described later, is in contact with the concave portion 34. The coaxial cable 35 has an outer conductor and a center conductor, the outer conductor is grounded, and a microwave signal is transmitted to the center conductor. The outer conductor of the coaxial cable 35 is electrically connected to the main body portion 31, and the center conductor is electrically connected to the cylindrical member at the center of the connector portion 32.

FIG. 5 is a diagram showing a state in which the connector portion 32 of the connection cable 30 is joined to the input connector 141. As shown in FIG. 5, the connector portion 32 is joined so as to cover the cylindrical member of the input connector 141. As a result, the outer conductor of the coaxial cable 35 and the cylindrical member of the input connector 141 are electrically connected, and the center conductor of the coaxial cable 35 and the wire rod (center contact) of the input connector 141 are electrically connected. Ru.

FIG. 6 is a diagram showing a configuration example of a grounding member 40 that connects the main body 31 of the connection cable 30 and the housing 11. As shown in FIG. 6, the grounding member 40 has an L-shaped member 41 in which holes 42 and 43 through which screws are inserted are formed, and a tongue-shaped portion 44 formed in a bent portion of the L-shaped member 41. .. A convex portion 45 is formed on the lower surface of the tongue-shaped portion 44. The grounding member 40 is made of, for example, a conductive member such as metal.

FIG. 7 is a diagram showing a state in which the grounding member 40 is attached to the housing 11. As shown in FIG. 7, the grounding member 40 is fixed to the housing 11 by inserting screws into the holes 42 and 43, respectively. Further, since the convex portion 45 formed on the lower surface of the tongue-shaped portion 44 is in contact with the concave portion 34 of the main body portion 31, the tongue-shaped portion 44 and the main body portion 31 are electrically connected. Here, since the grounding member 40 is connected to the housing 11, the housing 11 and the outer conductor of the coaxial cable 35 have the same potential. In this way, the outer conductor of the coaxial cable 35 and the housing 11 are electrically connected by the grounding member 40 and have the same potential, so that the influence of disturbance such as noise can be reduced. Further, since the grounding member 40 urges the main body 31 toward the circuit board 20 by the spring force, it is possible to prevent the connection cable 30 from falling off from the input connector 141.

FIG. 8 is a diagram showing the results of actual measurement of the passing characteristics of the high frequency module 10 when the grounding member 40 shown in FIGS. 6 and 7 is not used, using a constant temperature bath. In FIG. 8, the horizontal axis indicates the frequency (GHz), and the vertical axis indicates the passing characteristic (dB). Further, the solid line shows the ideal characteristic, the broken line with a short interval shows the characteristic when the door of the constant temperature bath is opened, and the broken line with a long interval shows the characteristic when the door of the constant temperature bath is closed.

FIG. 9 is a diagram showing the passage characteristics of the high frequency module 10 when the grounding member 40 shown in FIGS. 6 and 7 is used. From the comparison of FIGS. 8 and 9, when the grounding member 40 is used, the disturbance of the characteristic is suppressed and the characteristic is close to the ideal characteristic.

That is, by opening and closing the door of the constant temperature bath, for example, the capacitance and the like change, and the passing characteristics of the high frequency module change. This means that when placed in the accommodation box, the passage characteristics change depending on the positional relationship with other high-frequency modules and the wiring routing. However, by using the grounding member 40, such an influence can be reduced and a characteristic close to the ideal characteristic can be obtained.

Although the passage characteristics have been described as an example in FIGS. 8 and 9, in the high frequency module 10 according to the present embodiment, noise from other high frequency modules, a power supply circuit, or the like can suppress wraparound. , The S / N ratio can be improved. Further, by connecting the coaxial cable 35 and the main body 31 to the housing 11 by the grounding member 40, it is possible to prevent the feedback of the circuit from becoming unstable.

In particular, in the case of an amplifier circuit 23 that amplifies a high frequency with a high gain (for example, 40 dB or more), the S / N ratio deteriorates, the feedback becomes unstable, the passing characteristics become violent, and other high frequency modules. Although it is often influenced by the above, the occurrence of these can be suppressed by using the grounding member 40 as shown in the present embodiment.

As described above, according to the embodiment of the present invention, since the input connector 141 is arranged so that the connection cable 30 can be attached and detached from the normal direction of the circuit board 20, the connection work by the connection cable 30 is simplified. Can be transformed into. Further, when the input connector 141 is arranged on the side surface of the housing 11, a work space for connecting is required, so that it is necessary to arrange the high frequency module 10 and other high frequency modules with a space between them. However, in the case of the present embodiment, since such a work space is unnecessary, the size of the storage box can be reduced.

Further, in the embodiment of the present invention, since the grounding member 40 is used, the S / N ratio is deteriorated, the feedback becomes unstable, the passing characteristics are disturbed, and the influence from other high frequency modules is affected. It is possible to suppress receiving.

Further, in the embodiment of the present invention, since the connection cable 30 is urged in the direction of the input connector 141 by the grounding member 40, it is possible to prevent the connection cable 30 from falling off from the input connector 141.

Further, in the embodiment of the present invention, the input connector 141, the output connector 151, and the feedback connector 161 are provided near the apex of the housing 11, so that the connection cables connected to these are separated from each other. It is possible to prevent these from interfering with each other.

(B) Description of Modified Embodiment It is needless to say that the above embodiment is an example and the present invention is not limited to the above-mentioned case. For example, in the above embodiment, the input connector 141 has been described as an example, but the output connector 151 and the feedback connector 161 are also connected to the coaxial cable and the main body by the grounding member 40 shown in FIGS. 6 and 7. The housing 11 may be electrically connected to the housing 11. According to such a configuration, the same effect as the above-mentioned case can be obtained.

Further, in the above embodiment, the grounding member 40 having the shapes shown in FIGS. 6 and 7 is used, but a grounding member having a shape other than this may be used. For example, as an example, a grounding member 50 having a tongue-shaped shape as shown in FIGS. 10 and 11 may be used. That is, in the embodiment shown in FIGS. 10 and 11, a grounding member 50 having a tongue-shaped shape, a hole 52 at one end, and a protrusion 53 on the lower surface of the other end may be used.

Further, in the above embodiment, the grounding member 40 having the shapes shown in FIGS. 6 and 7 is used, but a grounding member having a shape other than this may be used. For example, as an example, a grounding member 60 having a hexagonal shape and covering the input connector 141 as shown in FIGS. 12 and 13 may be used. That is, in the embodiment shown in FIGS. 12 and 13, a grounding member 60 having a hexagonal shape, having holes 61 and 62, and having a protrusion 63 on the lower surface of the other end may be used. The grounding member 60 may be provided for any one of the input connector 141, the output connector 151, and the feedback connector 161.

Further, in the above-described embodiment, the grounding members 40, 50, and 60 have a structure that covers only the main body portion 31, but in order to further ensure electromagnetic shielding, the grounding members 40, 50, and 60 are configured to cover the entire input connector arrangement portion 14. May be.

Further, in the above embodiment, the grounding members 40, 50, and 60 are configured as separate members, but for example, they may be configured integrally with the lid portion 113 constituting the housing 11. According to such a configuration, the number of parts can be reduced.

Further, in the above embodiment, the input connector arranging portion 14 is arranged at the apex of the housing 11, but may be arranged at a place other than the apex. For example, as shown in FIG. 14, it may be arranged in the central portion of the housing 11. The same applies to the output connector arranging unit 15 and the feedback connector arranging unit 16.

10 High frequency module 11 Housing 12 Mounting part 13 Power connector 14 Input connector arrangement part 15 Output connector arrangement part 16 Feedback connector arrangement part 20 Circuit board 21 Input circuit 22 Power supply circuit 23 Amplifier circuit 24 Output circuit 25 Feedback circuit 30 Connection cable 31 Main unit Part 32 Connector part 33 Coaxial cable insertion part 34 Concave part 35 Coaxial cable 40 Grounding member 41 L-shaped member 42,43 hole 44 Tongue-shaped part 45 Convex part 50 Grounding member 52 hole 53 Projection part 60 Grounding member 61, 62 hole 63 Convex part 111 Bottom housing 112 Frame 113 Lid 141 Input connector 151 Output connector 161 Feedback connector

Claims (9)

In a high-frequency module in which a circuit board is housed in a conductive housing
A signal circuit formed on the circuit board and transmitting an electric signal having a predetermined frequency,
An input connector and an output connector into which an electric signal having a predetermined frequency is input and output, and
At least one of the input connector and the output connector has a configuration in which the connector of the connection cable is attached / detached from the normal direction of the circuit board.
It has a connection portion for connecting the ground of the connection cable and the housing.
The connection portion is configured as a member separate from the housing, and electrically connects the ground of the connection cable and the housing.
A high frequency module characterized by that. The connection cable has a main body portion having the same potential as the ground of the coaxial cable constituting the connection cable.
The connection portion electrically connects the main body portion and the housing.
The high frequency module according to claim 1 . The high-frequency module according to claim 2 , wherein the coaxial cable and the connector are arranged so as to be substantially orthogonal to the main body portion. The high frequency module according to claim 3 , wherein the connection portion urges the main body portion in the direction of the input connector or the output connector. The circuit board has a substantially quadrangular shape when viewed from the normal direction.
The housing is configured to cut out at least one vertex of the substantially square shape when viewed from the normal direction.
The high frequency module according to any one of claims 1 to 4 , wherein the input connector and the output connector are arranged near the apex. The housing is configured to cut out at least two vertices located diagonally to each other in the substantially square shape when viewed from the normal direction.
The high frequency module according to claim 5 , wherein the input connector and the output connector are arranged in the vicinity of the two vertices located diagonally to each other. The housing is
An lining portion that lays at least a part of the signal circuit from the normal direction, and
The high frequency module according to any one of claims 1 to 6 , further comprising an exposed portion that exposes at least one of the input connector and the output connector in the normal direction. The high frequency according to claim 7 , wherein the connecting portion extends from the covering portion to the exposed portion and is arranged in the normal direction of at least one of the input connector and the output connector. module. The high frequency module according to claim 8 , wherein the connection portion is arranged so as to cover at least one of the input connector and the output connector.

Images