JPS5860801A - Dielectric filter - Google Patents

Abstract

PURPOSE:To obtain a small-sized, lightweight case by using an input and output combined terminal which utilizes electric energy coupling. CONSTITUTION:In a dielectric block, holes constituting plural resonators are made. At both side end parts of the top surface of the dielectric block, holes 241 for input and output combined terminal insertion are perforated. Then, an input and output combined terminal 25 having an elastic pressure holding mechanism is inserted into each insertion hole 241. While an external conductor is connected to the terminal 25, a resonance-frequency adjusting screw 8 and a coupling-extent adjusting screw rod are turned respectively to make adjustments to a prescribed frequency and a coupling extent, and nuts 81 and 91 for fixation are tightened up. Thus, an input and output plug is not fitted on a flank, so realizing small-sized constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dielectric fiber which is several times as expensive as a dielectric fiber used in mobile radio equipment, etc., and in particular, to a dielectric fiber having a dissipated input/output coupling terminal.

Conventional 11 electric bodies used in mobile radio, especially in-vehicle radio 7
In this method, holes constituting a plurality of resonators are formed in one dielectric block at predetermined intervals, and the entire surface of the dielectric, including the inner surface of the hole, is metallized except for the top surface and both end surfaces. FIG. 1 shows a conventional dielectric filter in which holes for adjusting the degree of coupling are provided between adjacent holes of the resonator holes. In the figure, (a) is a plan view excluding the lid of the case, @ is a sectional view of the main part from the front, and 1 is a hole for adjusting the coupling degree between the resonator hole 11 made of high dielectric material and the resonator. A dielectric block having holes 12 formed in parallel in a predetermined manner, 2 a conductive film formed on the inner surface of the resonator hole 11, 8 a conductive film formed on the outer surface of the dielectric block l except for the top surface and both end surfaces; Reference numeral 4 indicates an input/output conductor film provided on both end faces of the dielectric block 1, 5 is a case made of metal etc. and stores the dielectric block 1, 6 is an input/output connector, and 7 is a lid of the case 5. The lid 7 is provided with adjustment screws 8 and a coupling adjustment threaded rod 9 that correspond to the resonator hole 11 and the coupling adjustment hole 12 of the dielectric block 1, and the wI4m screw 8 and the adjustment screw 9 are attached to the lid 7. The rods 9 are provided with fixing nuts 81 and 91, respectively.

The conductive films 2.8 and 4 are formed by metallization, for example, by applying a viscous material of silver and glass and then heating it. Further, the input/output conductor film 4 and the input/output plug 6 are connected respectively.

In this way, the resonant frequency adjusting screw 8 and the coupling degree adjusting threaded rod 9 are rotated to adjust the frequency and coupling degree to a predetermined value.
, and then tighten and fix the fixing nuts 81 and 91. However, although mobile radio devices (vehicle-mounted, portable, etc.) are focused on being smaller and lighter, the conventional devices mentioned above are equipped with input/output connectors 6 for connecting external conductors, so the dielectric fiber itself is There was an unavoidable problem that hindered miniaturization.

An object of the present invention is to solve the above-mentioned problems by focusing on an input/output coupling terminal using electrical energy μ coupling.

Briefly stated, the present invention provides a dielectric block in which holes constituting a plurality of resonators are formed in a dielectric Glock, and holes for inserting input/output coupling terminals are provided at both ends of the upper surface of the dielectric block. The terminal insertion hole is characterized in that an input/output connector having an elastic holding mechanism is inserted into the terminal insertion hole. Embodiments of the dielectric filter according to the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows a dielectric block according to the present invention made of a solid material, in which a plurality of resonator holes 201 and holes 202 for adjusting the degree of coupling between resonators are bored in parallel in a predetermined manner, and further holes are inserted at both ends. A dielectric block having an output coupling terminal insertion hole 208, 21 is a conductor film formed on the inner surface of the resonator hole 201,
22 is a conductive film metallized on the outer surface of the dielectric block 20 except for the upper surface and both end surfaces in the longitudinal direction. This conductor film 2
1 and 22 are formed by a metallization method or the like in which a viscous material of silver and guffs is applied and heated.

Note that the hole 202 is not metalized. The conductor film 21 of the hole 201 formed by the conductor film 22 on the outer surface and the dielectric material
constitute a wavelength resonator as an internal conductor, and are coupled between the legs.

FIG. 8 is a plan view of (a) and (6
) is a cross-sectional view of main parts from the front, and parts equivalent to those in the previous figure are given the same reference numerals. 28 is a case made of metal etc. that houses the dielectric block 20; 24 is the lid of the case 28 having holes 241 for input/output coupling terminals; 25 is an input/output coupling to be inserted into the input/output coupling terminal insertion holes 208; The input/output terminal 25 is made up of a plurality of contact pieces 251 and a terminal portion 252.

After inserting the contact piece 251 side of the input/output coupling terminal 26 into the dielectric block 200 Å output coupling terminal insertion hole 20B described in detail in the previous figure, the input/output coupling terminal 26 is housed in a metal case 728, and as shown in FIG. A lid 24 is mounted on the case 28, which is equipped with resonance frequency adjusting screws 8 and coupling degree adjusting threaded rods 9 corresponding to the holes 201 and 202 of the dielectric block 20 shown, and has holes 241 for input/output coupling terminals drilled therein. Place and fix. Then, with an external conductor (not shown) connected to the input/output coupling terminal 25, the resonance frequency adjustment screw 8 and the coupling degree +14 adjustment threaded rod 9 are rotated to adjust the frequency and coupling degree to a predetermined value, and then fixed. The nuts 81 and 91 are tightened and fixed. In this way, since the input/output connectors are not attached to the side of the case, miniaturization can be achieved.

FIG. 4 is a diagram for explaining the input/output coupling terminal (~ is a front view, @ is a front view of the input/output coupling terminal 25 inserted into the dielectric block, and the terminal 252 of the input/output coupling terminal 25 is inserted into the dielectric block. The length and thickness of the contact piece 261 are determined by the electrical coupling strength of the music input/output coupling terminal 25C1, and the relationship between the electrical coupling strength K and the length L of the terminal 252 is shown in FIG. Ta.

Since the gist of the present invention is to improve the birthability and workability,
Point a in FIG. 5 is not used, but point b, that is, a long terminal 252 is used. The terminal 252 is provided with a plurality of contact pieces 251 which are thin pieces for stoppers and have cuts (not shown) from the periphery toward the center, and are inserted into the input/output coupling terminal insertion hole 208 (see FIG. 4). There is one that is plastically deformed and inserted under pressure so that the terminal Z252 is at the center of the hole 208.

In addition, in the main dormitory example, the wavelength dielectric film was explained, but if a conductive film is also formed on the surface of the dielectric block 200, it can be applied as a wavelength dielectric film. - Furthermore, the conductor film formed on the inner surface of the resonator hole 201 is not limited to the metallization method, and may be a metal ring or the like.

As is clear from the above description, according to the dielectric filter of the present invention, it is easier to use input/output coupling terminals by electrical energy coupling, compared to the conventional method in which external conductors are connected via input/output connectors. The case can be made smaller,
Moreover, since it is lightweight, it is extremely advantageous when applied to various mobile radios and the like.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional dielectric filter with the lid removed, and Fig. 2 is a cross-sectional view of the main parts from the front. Fig. 2 is an embodiment of a dielectric resonator according to the present invention. FIG. 3 is the ninth @ perspective view to clarify the problem, and FIG.
4 is a sectional view of main parts from the front, (a) is a front view, and (b) is a #S for explaining the input/output coupling terminal according to the present invention.
FIG. 5, which is a front view showing the new opening extending into the electrical block, is a characteristic curve diagram for explaining the relationship between the strength of the connection and the strength of the terminal. In the figure, l and 20 are dielectric Glocks. 2.3, 4.21 and 22 are conductor films, 5 and 238
is the resonant frequency-phasing screw, 9Fi coupling I! : Keyaki adjustment screw, 11 and 201 are resonator holes, 12 and 202
Reference numeral 25 indicates a coupling degree-attack hole, 25 indicates an input/output coupling terminal, 241 indicates a hole for an input/output coupling terminal, 251 indicates a contact piece, and 252 indicates a terminal portion. Figure 1 (Q”1 Figure 2

Claims (1)

[Claims] 1. A dielectric film comprising a dielectric block formed with holes constituting a plurality of resonators, wherein an input/output coupling terminal having the dielectric holding mechanism is inserted therein.