JP2552897Y2 - Lumped constant type high frequency components - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumped constant type high frequency component such as a two-way distributor.

[0002]

2. Description of the Related Art FIG. 7 of the accompanying drawings shows an example of the structure of a conventional two-divider which is a lumped constant type high-frequency component of this kind. FIG. 8 shows the circuit diagram. As shown in FIG. 7, in this conventional two-way distributor, a dielectric plate 5 is disposed on a metal plate 6 provided with a flange 8 having a projection 7 for resistance welding on a lower periphery. . A plurality of conductor pins 11 are provided so as to penetrate the metal plate 6 and the dielectric plate 5. Each conductor pin 1
1 is inserted into each corresponding through-hole formed in the metal plate 6 and is insulated and fixed thereto by hermetic seal glass.

Further, coils 1A and 1B, a chip capacitor 2, and a chip resistor 3 are mounted on a dielectric plate 5. The chip capacitor 2 is electrically connected to the corresponding conductor pin 11 by connecting one end of the chip capacitor 2 to a circuit pattern 9A formed on the dielectric plate 5 by solder 10. The coil 1 </ b> A is electrically connected to the corresponding conductor pin 11 and the other end of the chip capacitor 2 using the conductor 4. The chip resistor 3 is electrically connected to the corresponding conductor pin 11 by connecting each end of the chip resistor 3 to a circuit pattern 9B formed on the dielectric plate 5 by solder 10. The coil 1 </ b> B is electrically connected to the corresponding conductor pin 11 and the other end of the chip capacitor 2 using the conductive wire 4.

As shown in FIG. 7, after mounting each lumped constant element on a dielectric plate 5 and soldering, a resin is applied on the circuit and a metal cover (not shown) in an inert gas. And the flange 8 of the metal plate 6 and the corresponding flange of the metal cover are sealed by resistance welding with the projection 7 to form a lumped constant type high frequency component. Coil 1 in this conventional lumped element type high frequency component
A and 1B are obtained by winding a ferrite core.

[0005]

The above-mentioned conventional lumped-constant type high-frequency component has the following problems since a ferrite core is used for the coil core. That is, when an AC magnetic field is applied to the ferrite core from the outside (a high-frequency signal passes through a coil wound around the ferrite core), an eddy current is generated inside the ferrite core. This eddy current is due to electromagnetic induction, and ferrite has higher resistance than metal (specific resistance: 10 ⁵ Ω · c).
m), but a small amount of current flows, so that eddy current is generated. The eddy current becomes heat and is lost, and the loss increases as the frequency of the high-frequency signal increases.
For this reason, a conventional lumped-constant high-frequency component using a ferrite core coil has a frequency of 500 MHz.
When used at a high frequency higher than about, the passage loss increases and the characteristics are degraded.

Further, in the conventional two-divider as a lumped-constant type high-frequency component, since two coils are used, it is difficult to stabilize high-frequency performance, and it is also difficult to achieve impedance matching on the input side. In addition, it takes time to wind the coil around the core, and a space for two coils is required, so that there is room for reducing the cost by reducing the size and saving the number of assembly steps.

An object of the present invention is to provide a lumped-constant high-frequency component which can solve the above-mentioned conventional problems.

[0008]

According to the present invention, a dielectric plate is provided on a metal plate, and a plurality of conductor pins are provided so as to penetrate the metal plate and the dielectric plate. In a lumped-constant-type high-frequency component in which a lumped-constant element such as a chip resistor, a chip capacitor, and a coil is connected between these conductor pins on a board, the core of the coil is a dielectric core, and the impedance matching on the input side is as described above. A circuit pattern provided on the dielectric plate so as to be opposed to the metal plate with a dielectric plate interposed therebetween and a chip capacitor mounted on the dielectric plate are to be mounted on the dielectric plate. The number of coils is reduced by at least one.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
Embodiments of the present invention will be described in more detail.

FIG. 1 is a schematic perspective view showing a mounted state of a two-way distributor, which is a lumped constant type high-frequency part, without a metal cover as an embodiment of the present invention. FIG.
FIG. 2 is an exploded perspective view of a disassembled part of the two distributor of FIG. As shown in FIGS. 1 and 2, the two-way distributor of this embodiment has a metal plate 6 provided with a flange 8 having a projection 7 for resistance welding around the lower portion, similarly to the conventional one described above.
The dielectric plate 5 is disposed on the substrate. A plurality of conductor pins 11 are provided so as to penetrate the metal plate 6 and the dielectric plate 5. Each of the conductor pins 11 is a metal plate 6
And is insulated and fixed thereto by hermetic seal glass 12.

Further, on the dielectric plate 5, the coil 1 and
Chip capacitors 2A and 2B and a chip resistor 3 are mounted. The chip capacitor 2A includes a dielectric plate 5
Is electrically connected to the corresponding conductor pin 11 by connecting one end with a solder 10 to a circuit pattern 9C formed on the dielectric plate 5 so as to face the metal plate 6 with the. The other end is connected to a conductor pin 11 corresponding to the ground by a solder 10. Chip capacitor 2
B is electrically connected to each corresponding conductor pin 11 by connecting each end of the circuit patterns 9C and 9D formed on the dielectric plate 5 with solder 10. The chip resistor 3 is electrically connected to each corresponding conductor pin 11 by connecting each end to a circuit pattern 9E formed on the dielectric plate 5 with solder 10. Coil 1
Are fixed on the dielectric plate 5 using the resin 14 and are electrically connected to the corresponding conductor pins 11 and one end of the chip capacitor 2B using the conductor 4.

FIG. 3 schematically shows a cross section of one conductor pin 11 after mounting and soldering each lumped element. After each lumped element is mounted on the dielectric plate 5 and soldered as shown in FIG. 1, a resin is applied to the circuit and the metal cover 13 (FIG. ), And the flange 8 of the metal plate 6 and the corresponding flange of the metal cover are subjected to resistance welding sealing by the projection 7 to complete a two-way distributor as a lumped-constant high-frequency component. This completed state,
FIG. 4 is a perspective view. FIG. 5 shows an electrical equivalent circuit diagram of the completed two-way distributor.

What is important here is that in this embodiment of the present invention, the core of the coil 1 is formed of a dielectric material such as ethylene tetrafluoride resin (trade name: Teflon). In this way, if a coil in which a dielectric core is wound is used as a lumped element of a lumped-constant high-frequency component, a high-frequency signal does not flow through the winding and no current is generated in the core. It has been found that no loss occurs even at a high frequency of about 1 GHz, and a function such as a two-way distributor can be sufficiently performed even in a high frequency band of about 1 GHz.

FIG. 6 is a graph illustrating the difference between the insertion loss of a two-way divider using a coil of a dielectric core according to the present invention and the insertion loss of a two-way divider using a coil of a ferrite core as in the prior art. In FIG. 6, curve A shows the insertion loss of a two-way splitter using a coil of a dielectric core according to the present invention, and curve B shows
It shows the insertion loss of a two-way distributor using a ferrite core coil as in the prior art. As is clear from comparison between these curves A and B, the two-divider using the ferrite core coil has a large insertion loss due to the loss of the core at a high frequency of about 500 MHz or more, and the Teflon and the like according to the present invention. A two-way divider using a coil of a dielectric core can be used stably without loss even at a high frequency of about 1000 MHz.

In the above embodiment of the present invention, 1
The impedance in the high frequency band up to about GHz is stabilized and matched by the circuit pattern 9C or the like formed on the dielectric plate 5, and the capacitor 2A is inserted in the input portion of the circuit so that the impedance is highly matched on the input side. ing.
Thereby, the coil conventionally provided on the input side could be omitted.

[0016]

According to the configuration of the lumped constant type high frequency component of the present invention, the high frequency performance in the high frequency band up to about 1 GHz is stable, the passage loss is small, and the expected functions of the distribution circuit and the like can be exhibited. . In addition, the impedance in the high frequency band up to about 1 GHz can be stably matched by a circuit pattern formed on the dielectric plate, whereby the coil conventionally provided in the input section can be omitted. Such a reduction in the number of coils to be incorporated leads to a reduction in the size of the lumped-constant-type high-frequency component as a whole and a reduction in the number of assembling steps, thereby reducing the cost.

Further, according to the present invention, it is possible to easily insert a capacitor in the input portion of the circuit, and thereby, it is possible to extremely easily and highly accurately perform impedance matching on the input side.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a mounted state of a two-divider, which is a lumped-constant-type high-frequency component as an embodiment of the present invention, without a metal cover.

FIG. 2 is an exploded perspective view of an exploded part of the two distributor of FIG. 1;

FIG. 3 is a diagram schematically showing a cross section of one conductor pin after mounting and soldering each lumped constant element as shown in FIG. 1;

FIG. 4 is a perspective view showing a completed state of the two distributor shown in FIGS. 1 and 2;

FIG. 5 is an electrical equivalent circuit diagram of the two divider in FIG. 4;

FIG. 6 shows a second embodiment using a coil of a dielectric core according to the present invention.
FIG. 7 is a graph illustrating the difference between the insertion loss of a distributor and the insertion loss of a conventional two-divider using a ferrite core coil.

FIG. 7 is a schematic diagram showing a structural example of a two-divider which is a conventional lumped-constant-type high-frequency component.

FIG. 8 is a circuit diagram of the conventional two divider of FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 coil 2A chip capacitor 2B chip capacitor 3 chip resistor 4 conductor 5 dielectric plate 6 metal plate 7 projection 8 flange 9C circuit pattern 9D circuit pattern 9E circuit pattern 10 solder 11 conductor pin 12 hermetic seal glass 13 metal cover 14 resin

Claims (2)

(57) [Scope of request for utility model registration] 1. A dielectric plate is provided on a metal plate, a plurality of conductor pins are provided so as to penetrate the metal plate and the dielectric plate, and a chip resistor is provided between the conductor pins on the dielectric plate. In a lumped-constant-type high-frequency component formed by connecting lumped-constant elements such as a chip capacitor and a coil, the core of the coil is a dielectric core, and impedance matching on the input side is performed with the metal plate with the dielectric plate interposed therebetween. Performed by a circuit pattern provided on the dielectric plate so as to face and a chip capacitor mounted on the dielectric plate, and the number of coils to be mounted on the dielectric plate was reduced by at least one. A lumped constant type high frequency component characterized by the following. 2. The lumped-constant high-frequency component according to claim 1, wherein said dielectric core is formed of tetrafluoroethylene resin.