JPS6244559Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a case structure that houses a plurality of high frequency components.

Conventionally, as shown in FIG. 1, filters 2 and 3 are arranged on the input side and output side of a high frequency amplifier 1, respectively, and a signal input to an input terminal 4 is passed through the filter 2 and then high frequency amplified. In the high frequency amplification circuit which amplifies the high frequency in the filter 1 and outputs it to the output terminal 5 through the filter 3, the filters 2 and 3 are each provided with a separate metal case as shown in FIG. 2 in order to provide a shielding effect. They were using the ones stored in 6 and 7.

However, as mentioned above, when two filters 2 and 3 are housed in separate metal cases 6 and 7, respectively, the filters 2 and 3
The disadvantage was that the cost of the high-frequency amplification circuit was high.

The present invention was devised in view of the above-mentioned circumstances regarding the conventional case structure, and involves holding high-frequency components in a recess formed in a case bent into a roughly S-shape, and placing these high-frequency components between the recesses. By shielding with a bulkhead, multiple high-frequency components are housed in one case, giving the case the dual functions of shielding and holding multiple high-frequency components, thereby reducing the cost of products that use multiple high-frequency components. The purpose is to provide a case structure that allows

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 3, 11 is a high frequency amplifier, 12 is a distributed constant type filter placed on the input side of the high frequency amplifier 11, and 13 is a distributed constant type filter placed on the output side of the high frequency amplifier 11. A filter 14 is a case that accommodates these two distributed constant filters 12 and 13.

The case 14 is made of aluminum,
A metal plate made of copper or duralumin, etc. is bent into a roughly "S" shape as shown in Figure 4.
The partition wall 15 and the retaining plate 16 are arranged on one side of the central partition wall 15.
A recess 17 is formed on the other side of the partition wall 15 to hold a distributed constant filter 12, which will be described later, and a recess 19 is formed on the other side of the partition wall 15, which holds another distributed constant filter 13, which will be described later. is forming.

As shown in FIG.
By bending the distributed constant type filter 12 so as to make an angle smaller than 90 degrees with respect to 0 and press-fitting the distributed constant type filter 12 into the recess 17 formed by the retaining plate 16 and the partition wall 15, the distributed constant type filter 12 is The spring force of the holding plate 16 allows it to be held in the recess 17.

Similarly to the above, the other holding plate 18 also has a support portion 21 bent at a nearly right angle to the partition wall 15.
By bending the distributed constant type filter 13 so as to form an angle smaller than 90 degrees with respect to the above-mentioned structure and press-fitting the distributed constant type filter 13 into the recess 19 formed by the above-mentioned retaining plate 18 and the partition wall 15, the distributed constant type filter 13 can be Holding plate 1
It is held in the recess 19 by a spring force of 8. The retaining plates 16 and 19 are provided with
The outer conductive film of the filter and the holding plates 16 and 19, which will be described later, may be soldered to each other by pouring solder through the holes 16a and 19a.

The partition wall 15 functions as a shield plate that shields the distributed constant filters 12 and 13 from each other when the distributed constant filters 12 and 13 are housed in the case 14, as shown in FIG.
In order to ensure shielding between the distributed constant filters 12 and 13, the upper end 1 of the partition wall 15 is
5a is made to protrude from the upper part of the case 15. Projecting pieces 26, 27 and 28, 29 protruding from both upper ends of the holding plates 16 and 18, respectively, are inserted into holes provided in a mounting board (not shown) and are soldered to electrically ground and mechanically. It is fixed. From the lower part of the partition wall 15 to the upper end 1
The length to the top of 5a and the retaining plates 16 and 18
The lengths from the bottom of the projections 26, 27 and the tops of the protrusions 28, 29 are set to the same value l.

The distributed constant filters 12 and 13 have a structure as shown in FIG.

In FIG. 6, 30 is a cubic dielectric block made of titanium oxide based ceramic dielectric;
Reference numerals 31 and 32 indicate through holes, which are provided in the dielectric block 30 in a manner that they are lined up at a constant interval. 33,
34 is a conductive film provided on the inner surfaces of the through holes 31 and 32, respectively, and 35 is a conductive film provided on at least four sides of the dielectric block 30. 36 is a conductive film provided on the bottom surface of the dielectric block 30, and one end side of the conductive films 33, 34 and the conductive film 35 are short-circuited to form a 1/2
This is for producing four-wavelength resonance. 37
is an input coupling capacitor connected to the other end side of the conductive film 33, and has a counter electrode 39,
40. To be more specific, a mounting member 41 made of a conductor such as a metal cylinder or a conductive paste is electrically and mechanically connected and fixed to the other end of the conductive film 33, and the counter electrode 40 is connected to the mounting member 41. It is electrically and mechanically connected and fixed. Reference numeral 42 denotes an output coupling capacitor connected to the other end of the conductive film 34, which has opposing electrodes 44 and 45 on a cylindrical dielectric 43. To be more specific, a mounting member 46 made of a conductor such as a metal cylinder or a conductive paste is electrically and mechanically connected and fixed to the other end of the conductive film 34, and the counter electrode 45 is connected to this mounting member 46. Connected and fixed electrically and mechanically.
Conductive film 3 shortened due to dielectric constant of dielectric 30
The resonant frequency is determined by the electrical length of 3 or 34. As shown in FIG. 6, the electrical length may be 1/4 wavelength or 1/2 wavelength. When the wavelength is 1/2, the conductive film 36 is not necessary. Note that the conductive films and electrodes in each figure are drawn with exaggerated film thicknesses for better understanding. In any case, two resonant units are constructed in this embodiment.

In addition, in FIG. 6, 47 is a cavity,
The size and shape of this cavity change the degree of inductive coupling between the two resonant units.

An equivalent circuit of the above-mentioned distributed constant filters 12 and 13 is shown in FIG.

In FIG. 7, 51 is an input terminal, 52 is an output terminal, 53 is an input coupling capacitance, 54 is an output coupling capacitance, and 55 and 56 are 1/4 wavelength resonant circuits shown as lumped constant circuits. be. Therefore, the filter shown in FIG. 7 is a filter in which the 1/4 wavelength resonant circuits are inductively coupled to each other, and the external circuit and the 1/4 wavelength resonant circuit are capacitively coupled.

In the embodiment shown in FIG. 3, it goes without saying that the case 14 can accommodate other electronic components in place of the distributed constant filters 12 and 13. The holding method is not limited to clamping, but may also include soldering, adhesive, or a combination of these.

As is clear from the detailed description above, the present invention allows a plurality of high-frequency components to be housed in a single S-shaped case in a mutually shielded state. The whole becomes more compact, and the space occupied by the parts is reduced, while multiple high-frequency parts are housed in one case, and shield plates are no longer required, significantly reducing the cost of products that use high-frequency parts. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a general high frequency amplification circuit, Fig. 2 is an explanatory diagram of a high frequency amplification circuit using a filter with a conventional case structure, and Fig. 3 is an explanatory diagram of a case structure according to the present invention. Fig. 4 is a perspective view of the case shown in Fig. 3, Fig. 5 is a plan view of the case shown in Fig. 3, Fig. 6 is a longitudinal cross-sectional view of the distributed constant type filter, and Fig. 7 is a distributed constant type filter shown in Fig. 6. FIG. 3 is an equivalent circuit diagram of a filter. 12, 13...distributed constant type filter, 14...
Case, 15... partition, 17, 19... recess.

Claims (1)

[Scope of utility model registration request] High-frequency components are held in a plurality of recesses formed in a wavy case formed by bending a metal plate into a roughly S-shape, and these high-frequency components are shielded from each other by partition walls separating the recesses. case structure.