JPH0483401A - Microwave unit - Google Patents

Abstract

PURPOSE:To attain sure electromagnetic shielding and to improve handling by providing this microwave unit with an electromagnetic shielding case having a waveguide connection hole corresponding to a waveguide connection port of an isolator and a connection cable inserting hole formed on a unit body and constituted so that a waveguide is connected to the unit body through the waveguide connection hole. CONSTITUTION:The unit body 12 constituted of electrically and mechanically unitedly connecting the waveguide type isolator 10 and a microwave receiving module 11 which are respectively minimum units is covered with the electromagnetic shielding case 13 having the waveguide connection hole 14a corresponding to the connection port of the waveguide connection flange 10a of the isolator 10 and the connection cable inserting hole 15a corresponding to the cable connection part 11a of the module 11 and constituted of connecting the waveguide 16 to the unit body 12 through the hole 14a. Consequently, simple and accurate electromagnetic shielding can be attained and the handling of this unit can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Field of Industrial Application) This invention relates to a microwave unit used in a microwave transmitter/receiver or the like.

(Prior Art) Generally, a microwave unit is composed of a waveguide 1, a waveguide isolator 2, and a microwave module 3, as shown in FIG. By the way, in the case of such a microwave unit, for example, in the case of a satellite communication receiver, the reception level is extremely low, less than -100 dBm. When external radiation radio waves from etc. fall into the reception band,
It becomes difficult to ensure desired performance. Therefore, in the microwave unit, the signals shown in FIG. A shielding agent 4 such as a conductive adhesive is applied to the input and output ends to shield radio waves radiated from the outside, and a shielding means is provided to prevent the radiation of internal radio waves.

However, the shielding means of the microwave unit described above requires electromagnetic shielding by applying a shielding agent 4 to the connection points during assembly, making the assembly extremely troublesome and time consuming. In addition, there was a problem in that the shielding performance was inconsistent and the reliability was low. Further, according to this, maintenance and inspection including adjustment work after assembly is completed is difficult, and handling is troublesome.

(Problems to be Solved by the Invention) As mentioned above, with conventional microwave units, assembly work is extremely troublesome and takes a lot of time.
There have been problems in that the reliability of the electromagnetic shield is low and handling is troublesome.

This invention has been made in view of the above circumstances, and an object of the present invention is to provide a microwave unit that is simple, can realize reliable electromagnetic shielding, and can improve handleability. .

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a unit body formed by electrically and mechanically integrally coupling a waveguide isolator and a microwave module, and this unit body. It encloses the main body and has a waveguide connection hole corresponding to the waveguide connection port of the isolator and a connection cable insertion hole of the unit main body, and is connected to the unit main body with the waveguide connection hole in between. The microwave unit includes an electromagnetic shielding case formed by connecting waveguides.

(Function) According to the above configuration, the electromagnetic shielding case electromagnetically shields only the unit main body by enclosing the minimum unit main body excluding the waveguide. Therefore, effective electromagnetic shielding of the unit body will be performed,
High performance of the unit body is ensured.

In addition, according to this, the unit body is electromagnetically shielded by housing the unit body in an electromagnetic shielding case with the adjustment completed and covering it with the electromagnetic shielding case, so even after assembly, the unit body Maintenance and inspection, including adjustment work, can be performed simply by removing the main body from the electromagnetic shielding case.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a microwave unit according to an embodiment of the present invention, in which a waveguide isolator 10 is connected to the input end of a microwave receiving module 11 to form a unit body. The unit main body 12 is made of, for example, a metal plate and is housed and encapsulated in an electromagnetic shielding case 13 formed in a substantially rectangular parallelepiped shape. The electromagnetic shielding case 13 includes, for example, a bottomed cylindrical case body 14 and a lid body 15,
The overall shape and size are considered as the thickness dimension, but it is usually 1/10'O of the wavelength at the frequency used.
It can be set to the following, and in the case of the 10GH2 band, it is set to 0.3 mm or less. Of these, the lid body 15 has a
As shown in , an elastic engagement part 15a is formed on the peripheral wall on the connection side corresponding to the tip of the case body 14, and a cable connection part for the IF signal 1 local oscillation signal of the microwave receiving module 11 is formed on the bottom surface of the elastic engagement part 15a. A connection cable insertion hole 15b is formed through which the cable 11a is inserted. On the other hand, as shown in FIG. 2(a), the case body 14 has a waveguide connection hole 14 on its bottom surface.
a is formed corresponding to the connection port of the waveguide connection flange 10a of the isolator 10, and a hole 16b of the connection flange 16g of the waveguide 16 is formed on the bottom surface of the case body 14 around the waveguide connection hole 14a. Through-hole 1 for mounting compatible with
4b are formed at predetermined intervals (see FIG. 1).

Further, the waveguide connecting flange 10a of the isolator 10 has a screw hole 10b in the connecting flange 1 of the connecting waveguide 16.
They are formed at predetermined intervals corresponding to the mounting holes 16b of 6a.

In the above configuration, in the unit body 12, the isolator 10 and the microwave receiving module 11 are individually adjusted and electrically and mechanically connected, and then adjusted and housed in the case body 14 of the electromagnetic shielding case 13. Ru. Here, the lid body 15° is engaged and integrated with the case body 14 using the elastic force of the elastic engagement portion 15a.

At this time, the unit main body 12 has its microwave receiving module 110 cable connection part 11a inserted into the connection cable insertion hole 15b of the lid 15, and is fixed to the lid 15 with the nut member 17. An electromagnetic seal is provided. Here, the unit body 12 is housed and encapsulated in the electromagnetic shielding case 13 with the waveguide connection flange 10a of the isolator 10 facing the waveguide connection hole 14a of the case body 14. Next, on the outside of the bottom surface of the case body 14 of the electromagnetic shielding case 13, a connection waveguide 16 connected to an external circuit (not shown) is arranged with its flange 16a facing the waveguide connection hole 14a. A screw member 18 is inserted into the attachment hole 16b of the connection waveguide 16, and this screw member 18 connects to the waveguide connection flange 10 of the isolator 10 of the unit main body 12.
By being screwed into the screw hole 10b of the case body 13, it is coupled to the isolator 10 via the waveguide connection hole 14a on the bottom surface of the case body 13. At the same time, the lid 15 is screwed onto the microwave receiving module 11 inside the electromagnetic shielding case 13 using a screw member 19.

In this way, the microwave unit includes the minimum unit waveguide isolator 10 and the microwave receiving module 1.
A unit main body 1 in which 1 is integrally connected electrically and mechanically.
2 has a waveguide connection hole 14a corresponding to the connection port of the waveguide connection flange 10a of the isolator 10 and a connection cable insertion hole 15a corresponding to the cable connection part 11a of the microwave receiving module 11, and the waveguide The unit body 12 and the waveguide 16 are connected to each other with the connection hole 14a in between and are enclosed in an electromagnetic shielding case 13. According to this, since the unit main body 12, which is the smallest unit excluding the connecting waveguide 16, is covered with the electromagnetic shielding case 13, electromagnetic shielding of only the unit main body 12 is performed. Effective electromagnetic shielding is realized, and high performance of the unit body 12 is ensured. Further, according to this, in order to take out the unit main body 12 from the electromagnetic shielding case 13 after assembly is completed, the screw members 18 and 19 are removed from the case main body 14 and the lid 15, and the nut member 17 is removed. This is achieved by detaching the lid body 15 from the case body 14 against the elastic force of the elastic engagement portion 15a.
Maintenance and inspection work including adjustment work of the unit body 12 after assembly is easily realized.

In the above embodiment, the case was explained in which the waveguide connection hole 14a was only provided in the case body 14 of the electromagnetic shielding case 13, but for example, as shown in FIG. 3, the waveguide connection hole 1
Elastic deformation part 14c having a packing function around the periphery of 4a
It is also possible to provide a configuration in which the connecting waveguide 16 and the isolator 10 are connected so as to sandwich the elastically deformable portion 14c. In this case, the isolator 10
By improving the adhesion between the connecting waveguide 16 and the connecting waveguide 16,
Even better effects are expected.

Further, in the above embodiment, the microwave receiving module 11
Although we have explained the case where it is applied to a receiving system using .

Further, in the above embodiment, the cable connecting portion 11a is inserted into the connecting cable insertion hole 15b of the lid 15, but the present invention is not limited to this. For example, the connecting cable can be inserted directly into the connecting cable insertion hole 15b. It is also possible to configure it so that it can be inserted through it.

Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to easily,
It is possible to provide a microwave unit that can realize reliable electromagnetic shielding and can improve handleability.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a microwave unit according to an embodiment of the present invention, FIG. 2 is a sectional view showing details of the main parts of FIG. 1, and FIG. 3 is a diagram showing another embodiment of the invention. 4 and 5 are perspective views showing conventional microwave units. DESCRIPTION OF SYMBOLS 10... Waveguide type isolator, 10a... Waveguide connection flange, 10b... Screw hole, 11... Microwave receiving module, 12... Unit main body, 13...
... Electromagnetic shield case, 14 ... Case body, 14
a... Waveguide connection hole, 14b... Through hole, 15...
Lid body, 15a... Elastic engagement part, 15b... Connection cable insertion hole, 16... Connection waveguide, 16a... Flange, 16b... Mounting hole, 17... Nut member, 1
8.19...Screw member. Applicant's agent Patent attorney Takehiko Suzue (a) (b) Figure 4

Claims (1)

[Scope of Claims] A unit body formed by integrally coupling a waveguide isolator and a microwave module electrically and mechanically; an electromagnetic shielding case having a waveguide connection hole corresponding to the opening and a connection cable insertion hole of the unit main body, and the unit main body and the waveguide are connected with the waveguide connection hole in between. A microwave unit characterized by: