JPS62188501A - Microwave equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a plurality of microwave circuits each having a dielectric substrate on which a microwave integrated circuit formed using a microstrip line is fixed on a carrier plate. The present invention relates to a microwave device configured by arranging the above in a conductor case.

[Prior Art] Fig. 3 is a plan view (a) and a side view (b) showing the general configuration of a conventional microwave circuit of this type, and Fig. 4 is a diagram showing a structure assembled using a plurality of microwave circuits of this type. It is a top view (a) and a front sectional view (b) which show the general structure of a microwave device. In the figure, (1) is a dielectric substrate, and (2) is formed on the surface of this dielectric substrate (1).

Microwave integrated circuit using microstrip line,
(3a)<3b) are its input/output line terminals, and (4) is a carrier plate made of a metal plate, to which the dielectric substrate (1) is fixed with solder or conductive adhesive.
(5a) to (5d) are screw holes for fixing this to the case. A configuration in which a plurality of microwave circuits (6a) (6b) (6c) shown in FIG. 3 are arranged is shown in FIG. 4, and (7) has a window-like opening (7a ), and a microwave circuit (
6a) to (6c) are arranged and screwed together. (
8a) (8b) is the plug provided at both ends of the case, (
9a) (9b) are each microwave circuit (6a) to (6
It is a metal foil for electrically connecting the input/output line terminals (3a) and (3b) of c).

By the way, in the microwave device shown in FIG. 4, in order to suppress the waveguide mode excited in the case (7),
The inner dimension a of the window-like opening (7a) of the case (7) is the free space wavelength λ of the frequency used. It is generally well known that it is necessary to set a<λ,/2 for . Therefore, as the operating frequency increases, it is necessary to reduce the dimension a. However, although there is a tendency for the dielectric substrate (1) to be made smaller as the frequency increases, the carrier plate (4) does not have a case. Space was required for screwing to (7), so it could not be made too narrow.

FIG. 5 is a plan view (a) and a side view (b) showing a conventional microwave circuit of this type that has been improved in this respect.

FIG. 6 is a plan view (a) and a side view (b) showing this type of microwave device using this microwave circuit. In the figure, (lO) is a carrier plate that fixes the dielectric substrate (1), and protruding side walls (LOA) (10B) are shown on both sides.
) is different from the carrier plate (4) shown in FIGS. 3 and 4, and other parts are the same as those shown in FIGS. 3 and 4.

In this case, the frequency at which the waveguide mode is excited is already determined by the dimensions between the side walls (10a) and (10b) of the carrier plate (10), so the upper limit of the usable frequency can be increased compared to the one in Figure 4. . However, even with this configuration, the waveguide mode is excited in the gap (lla) (Hb) created between the carrier plates (10) of each microwave circuit (6a) to (6c), so this becomes a parasitic reactance and has broadband characteristics. is damaged.

Therefore, as a countermeasure, for example,
The microwave device shown in Publication No. 83 was used. Fig. 7 and Fig. 8 show this conventional example, Fig. 7 is a plan view (a) and a side view (b) of this microwave circuit, and Fig. 8 is a microwave circuit assembled with this microwave circuit. In Figure 0, which is a plan view of the wave device, (1) (3a) (3b)
(5a) (5b) (7) (8a) (8b) (
9a) and (9b) are the same as those in FIGS. 3 to 6 above, and (
12) is a carrier plate which has protruding side walls (10a) (10b) like (10) in Fig. 5, but unlike this, it has grooves (13a) (13b) (13) on the adjacent end surface.
c) It has (13d).

(14a) (14b) (14c) are microwave circuits having the configuration shown in FIG. 7, (15a) (15b) (15
c) (15d) is a metal spring member.

In this configuration, the adjacent microwave circuit (14a)
Since the grooves (15a) to (15d) of (14c) are fitted, adjacent carrier plates (12) are short-circuited, and the generation of parasitic reactance, which is a problem in the conventional example shown in FIG. 6, can be suppressed. The above-mentioned publication also discloses a structure in which the grooves have an uneven structure and are short-circuited to fit between each carrier plate.

[Problems to be Solved by the Invention] Conventional microwave devices are configured as described above, so in order to obtain broadband characteristics, the number of parts must be increased by using spring members or fitting structures. This has the disadvantage that the structure becomes complicated and expensive. In addition, special metals such as Kovar are often used as the material for the carrier plate, and providing a protruding side wall to this material increases the material and weight, which is a problem in that it goes against the goal of reducing single-layer construction and cost reduction. was there.

The present invention has been made to solve the above-mentioned problems, and its object is to obtain a microwave device with broadband characteristics that can reliably suppress the waveguide mode with a simple WJ structure.

[Means for Solving the Problems] In the microwave device according to the present invention, the conductor case is divided into a lower mounting base and an upper case body.

Each microwave circuit is fixed to the mounting pedestal at the flat portions on both sides of the carrier plate to which the dielectric substrate is not fixed, and the case body is placed on the pedestal with the case body in electrical contact with the flat portion of the carrier plate. It was designed to be fixed at .

[Function] In this invention, each microwave circuit and the flat parts on both sides of the carrier plate are electrically short-circuited in the upper case body and fixed to the lower mounting base, so the inner wall dimension of the case is narrowed. , this suppresses the generation of waveguide modes.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view (a) and a side sectional view (b) showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view. In the figure, (6a), (6b), and (6c) are microwave circuits having the same configuration as the conventional example shown in FIG. 3, and (1) is a dielectric substrate.

(2) is a microwave integrated circuit, (3a) (3b) is an input/output line terminal, (4) is a carrier plate, (4a)
(4b) is a flat portion, and the dielectric substrate (1) is fixed between the flat portions (4a) and (4b) with solder or conductive adhesive. (5a) to (5d) are screw holes provided in the carrier plate flat portions (4a) and (4b). (8a
) (8b) is a plug, (9a) (9b) is a metal foil for connection, (16) is a conductor case, and the upper case body (17
) and a lower mounting pedestal (18), (
19) is a screw hole for fixing both (17) and (18). The microwave circuits (6a) (6b) (6c) are attached to the mounting pedestal (18) through the screw holes (5a).
It is fixed with screws (5d). The case body (17) has a wide window-like opening (17a), the four corners of which are formed in a semicircular shape to provide clearance for the cutter during processing. This case body (17) is attached to the mounting pedestal with its lower surface in contact with the carrier plate flat parts (4a) (4b) of each microwave circuit (6a) (6b) (6c) and electrically conductive. It is fixed with screws or solder.

In the above configuration, the width of the window-like opening (17a) of the case (16), that is, the width of the inner wall of the case, is equal to the width of the dielectric substrate (1
) can be set to a small value close to the width of b, and the waveguide mode is suppressed to a high frequency determined by this b. Since the carrier plates of each microwave circuit (6a) (6b) (6c) are short-circuited by the case body (17), waveguide mode excitation between them is completely suppressed.

[Effects of the Invention] As described above, according to the present invention, the carrier plate of each microwave circuit is electrically short-circuited by the conductor case without requiring any special configuration as a microwave circuit, so that the waveguide The effect is that modes can be reliably suppressed and practical up to very high frequencies can be obtained with a simple structure and at low cost.

[Brief explanation of drawings]

FIG. 1 is a plan view (a) and z showing an embodiment of the present invention.
-Z sectional view (b), Fig. 2 is an exploded perspective view of the same, Fig. 3 is a plan view (a) and side view (b) showing one of the conventional microwave circuits, and Fig. 4 is this microwave circuit. A plan view (a) and a cross-sectional view (b) showing a microwave device in which a wave circuit is assembled, and FIG. 5 is a plan view (a) and a side view (b) showing another example of a conventional microwave circuit. ), ``Figure 6 is a plan view (a) and a Y-Y sectional view (b) showing the assembled microwave device, and Figure 7 is a plan view showing still another example of the conventional microwave circuit ( A), a side view (b), and FIG. 8 are plan views showing the assembled microwave device. In the figure, (1) is a dielectric substrate, (2) is a microwave integrated circuit, (4) is a carrier plate, (4a) (4
b) is the flat part, (6a) (6b) (6c) is the microwave circuit, (8a) (8b) is the plug, (16) is the conductor case, (17) is the case body, (17a) is the window (18) is a mounting base. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] A plurality of microwave circuits each having a dielectric substrate on which a microwave integrated circuit constructed using microstrip lines is fixed on a carrier plate made of a conductor are connected to each other with input/output connectors at both ends in the form of a window. In a microwave device arranged and fixed in a conductor case having an opening,
The conductive case is divided into a lower mounting pedestal and an upper case main body, each of the carrier plates has a flat part at least in part, each of the dielectric substrates is fixed between the flat parts, and each of the micro The wave circuit is fixed to the pedestal at the flat portion of the carrier plate, and the case body is fixed to the pedestal while being in electrical and mechanical contact with the flat portion of the carrier plate. microwave equipment.