JPH065203U - Microwave device connection structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a connection structure of a microwave device that can evaluate microwave devices individually, and that is compact and has low loss. [Structure] Substrate 11 on which microwave circuit is formed
A metal case 13 having an opening 16 formed in the surface for accommodating the same and connecting with another microwave circuit, a metal rod 18 and a dielectric 19 surrounding the metal rod 18, and a predetermined characteristic impedance. -Dancing and opening 1 of the metal casing 13
6, a metal rod 18 is inserted into the substrate 6, and the metal rod 18 electrically connects with the microwave circuit formed on the surface of the substrate 11.
It consists of and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a microwave device connection structure that connects together microwave devices that constitute devices used for microwave communication, such as transmitters and receivers.

[0002]

[Prior art]

 A connection structure of a conventional microwave device will be described with reference to FIG.

In the following description, an amplifier will be described as an example of the microwave device.

The microwave device 21 a, for example, an amplifier is formed by forming a microwave circuit on the surface of a substrate 22 and housing the substrate 22 in a metal case 23. Here, the microwave circuit is a strip line or a matching circuit (not shown) formed on the surface of the substrate 22, a field effect transistor (hereinafter referred to as FET) 24 attached to the central portion of the surface of the substrate 22, and the like. It consists of Coaxial connectors 25 are attached to both ends of the metal case 23.

When connecting the microwave device 21a having the above-mentioned configuration to another microwave device 21b, for example, a widening device, a connector 26 is used, and both ends of the connector 26 are coaxial with the microwave devices 21a and 21b. This is done by connecting the connector 25.

Since the other microwave device 21b has the same structure as the microwave device 21a described above, the corresponding parts are designated by the same reference numerals and the description thereof will be omitted.

[0007]

[Problems to be solved by the device]

 According to the connection structure of the microwave devices described above, the respective microwave devices, for example, the amplifiers are independent from each other. Therefore, each microwave device can be evaluated individually. Also, since each microwave device is completely shielded, it does not adversely affect other microwave devices.

However, since the connection connector 26 is used for connecting the microwave device, there is a drawback that the entire length of the microwave device becomes long and the transmission loss of the circuit becomes large due to the increase in length.

In order to solve such a drawback, conventionally, a connection structure of a microwave device as shown in FIG. 3 has been considered.

In FIG. 3, the same parts as those in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

A microwave circuit is formed on the surface of one common substrate 31. This microwave circuit uses, for example, a microstrip line, a matching circuit (not shown), an FET 24, and the like to form two amplifiers. A substrate 31 on which two amplifiers are formed is housed in a metal case 32, and a shield plate 33 is provided at the boundary of each amplifier.

In this case, one metal case 32 constitutes two microwave devices 21a and 21b. The shield plate 33 prevents electromagnetic coupling of the FET between the microwave devices 21a and 21b and the components attached thereto, and prevents abnormal operation such as oscillation.

Coaxial connectors 25 are attached to both ends of the metal case 32, and are used for connection with other microwave devices.

In the case of the above-mentioned structure, since the connection connector is not used for the connection between the microwave devices, there is an advantage that the entire length of the microwave device can be shortened and downsized. However, there is a drawback that only one microwave device can be taken out and evaluated individually.

An object of the present invention is to provide a connection structure for a microwave device, which can evaluate microwave devices individually, and which is compact and has low loss.

[0016]

[Means for Solving the Problems]

 The microwave device connection structure of the present invention includes a metal case having a base plate on which a microwave circuit is formed, and an opening formed on a surface for connecting with another microwave circuit. It is composed of a metal rod and a dielectric material surrounding the metal rod and has a predetermined characteristic impedance. The metal rod is inserted into the opening of the metal case, and the metal rod is formed on the surface of the substrate. It is provided with a circuit and a connecting part for electrical connection.

[0017]

[Action]

 According to the above configuration, an opening is formed on the surface of the case that houses the microwave circuit for connecting the microwave circuits to each other. The microwave circuits can be connected to each other by inserting a connecting part composed of a metal rod and a dielectric surrounding the metal rod.

[0018]

【Example】

 An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 11 denotes a substrate. A microstrip line and a matching circuit (not shown) are formed on the surface of the substrate 11, and FETs 12 are attached to form a microwave circuit. The substrate 11 on which the micro circuit is formed is housed in the metal case 13 to form one microwave device 14a such as an amplifier.

A coaxial connector 15 connected to an internal microstrip line or the like is attached to one wall surface of the metal case 13, and an opening 16 is provided in the other wall surface.

Further, the other microwave device 14 b connected to the microwave device 14 a has the same configuration as the microwave device 14 a described above, and therefore, the same reference numerals are given to the same portions and the description thereof will be omitted. To do.

Reference numeral 17 denotes a connecting part for connecting the above-mentioned two microwave devices 14a and 14b, which is composed of, for example, a metal rod 18 and a cylindrical dielectric 19 surrounding the metal rod 18, and has a predetermined characteristic impedance. Have a dance One end of this connecting part 17 is inserted into the opening 16 of the one metal case 13, and the other end is inserted into the opening 16 of the other metal case 13. Both ends of the metal rod are electrically connected to a micro-cross line or the like inside each case 13 by, for example, soldering.

The connecting part 17 constitutes one coaxial line using the metal case 13 as an outer conductor, for example.

Therefore, in the above embodiment, the microwave circuit housed in the two metal cases 13 should be connected by the coaxial line formed by the metal case 13 and the connection component 17. become.

Although the above-mentioned connecting part 17 surrounds the metal rod 18 with the dielectric 19, the connecting part 17 may be formed of an air layer instead of the dielectric 19. When the connecting component 17 is a coaxial line, the metal case 13 may be used as the outer conductor as described above, but a metal wall surrounding the outer periphery of the cylindrical dielectric 19 is formed. Can also be the outer conductor.

Further, if the left half of the connecting part is placed in the opening of one case and the right half of the connecting part is placed in the opening of the other case, two metal cases are formed. -The case can be arranged so as to be in close contact, and the connecting parts can be built in the wall of the case in which they are in close contact.

Therefore, the entire device can be miniaturized, and the connection portion becomes a good coaxial line, so that the circuit loss is reduced. When evaluating the microwave circuits individually, remove the connecting parts and connect the connector to the parts.

Further, since the metal case has a shield function, mutual electromagnetic coupling can be prevented. Further, in the above embodiment, the case where the microwave circuit is an amplifier has been described, but the present invention can be applied to a case where the microwave circuit is an oscillator, a mixer, a circulator, or an isolator.

[0029]

[Effect of device]

 ADVANTAGE OF THE INVENTION According to this invention, the connection structure of the microwave device which can be miniaturized, has little circuit loss, and can evaluate each microwave circuit individually, without impairing the shield function of each microwave circuit connected mutually. Can be provided.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.

FIG. 2 is a diagram illustrating a conventional example.

FIG. 3 is a diagram illustrating another conventional example.

[Explanation of symbols]

 11 ... Substrate 12 ... FET 13 ... Cases 14a, 14b ... Microwave device 15 ... Coaxial connector 16 ... Opening 17 ... Connection component 18 ... Metal rod 19 ... Dielectric material

Claims (2)

[Scope of utility model registration request] 1. A metal case, which houses a substrate having a microwave circuit formed on the surface thereof, and has an opening formed on the surface for connecting to another microwave circuit, and a metal rod and the surrounding thereof. A connecting part made of a dielectric material and having a predetermined characteristic impedance, inserted into the opening of the metal case, and having the metal rod electrically connected to the microwave circuit formed on the surface of the substrate. A microwave device connection structure comprising: 2. The connection structure for a microwave device according to claim 1, wherein the dielectric is an air layer.