JPH0629202U - Adapters for mounting circuit boards and dielectric filters - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a circuit board and a mounting adapter capable of improving the characteristics of a dielectric filter. [Constitution] The dielectric filter 2 is mounted on the circuit board 1 after the adapter 3 is mounted. At this time, the input / output electrodes of the dielectric filter 2 and the input / output electrodes 11 of the circuit board,
12 is connected via the connection electrodes 31 and 32 of the adapter 3. A through hole 13 is formed between the input / output electrodes 11 and 12 on the circuit board 1, and a through hole 33 is formed between the connection electrodes 31 and 32 on the adapter 3. These through holes 13 and 33 reduce the parasitic capacitance between the input / output electrodes 11 and 12 and the parasitic capacitance between the connection electrodes 31 and 32, and improve the attenuation characteristic of the dielectric filter 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an adapter for mounting a circuit board and a dielectric filter, and more particularly to an adapter used for mounting the circuit board on which the dielectric filter is mounted and the dielectric filter on a circuit board.

[0002]

[Prior art]

 3 and 4 are views showing an example of the mounting structure of the dielectric filter, in particular, FIG. 3 is an exploded perspective view thereof, and FIG. 4 is a sectional view thereof. As shown in FIGS. 3 and 4, input / output electrodes 11 and 12 are formed on one main surface 1a of the circuit board 1 such as a PCB (printed circuit board). On the other hand, input / output electrodes 21 and 22 are also formed on the mounting surface of the dielectric filter 2. The dielectric filter 2 is surface-mounted on the input / output electrodes 11 and 12. At this time, the input / output electrodes 21 and 22 of the dielectric filter 2 are connected to the input / output electrodes 11 and 12 of the circuit board 1, respectively.

5 and 6 are diagrams showing another example of the mounting structure of the dielectric filter, in particular, FIG. 5 is an exploded perspective view thereof, and FIG. 6 is a sectional view thereof. In FIG. 5 and FIG. 6, an adapter 3 is attached to the dielectric filter 2. Dielectric filter 2 is mounted on one main surface 1a of circuit board 1 via adapter 3. The adapter 3 includes an insulating substrate 3a, and the connecting electrodes 31 and 32 are formed on the insulating substrate 3a. The connection electrodes 31 and 32 connect the input / output electrodes 21 and 22 of the dielectric filter 2 and the input / output electrodes 11 and 12 of the circuit board 1 which are arranged at mutually different intervals. Such an adapter 3 is proposed by the applicant of the present application and filed prior to the present application.

[0004]

[Problems to be solved by the device]

 As shown in FIG. 4, in the circuit board 1, a parasitic capacitance Ca is generated between the input / output electrodes 11 and 12. Due to this parasitic capacitance Ca, an undesired leak path of a high frequency signal is formed between the input / output electrodes 11 and 12, and the attenuation characteristic of the dielectric filter 2 deteriorates.

Similarly, also in the adapter 3, a parasitic capacitance Cb is generated between the connecting electrodes 31 and 32 (see FIG. 6). As a result, an undesired leak path for high-frequency signals is formed between the connecting electrodes 31 and 32, and the attenuation characteristic of the dielectric filter 2 deteriorates.

Therefore, it is an object of the present invention to provide a circuit board and an adapter that can improve the characteristics of a dielectric filter.

[0007]

[Means for Solving the Problems]

 The invention according to claim 1 is a circuit board in which a dielectric filter is mounted on one main surface thereof, and a plurality of input / output electrodes connected to the dielectric filter are formed on one main surface thereof. In addition, in order to reduce the parasitic capacitance generated between the input / output electrodes, a deleted region is provided between the input / output electrodes.

According to a second aspect of the present invention, there is provided an adapter, which is mounted on a dielectric filter when the dielectric filter is mounted on a circuit board, the adapter being formed on an insulating substrate and a surface of the insulating substrate. , The input / output electrodes on the dielectric filter side and the input / output electrodes on the circuit board side, which are arranged at different intervals from each other, are provided with a plurality of connecting electrodes, and the parasitic capacitance generated between the connecting electrodes is In order to reduce the number, it is characterized in that a deletion region is provided between each connection electrode on the insulating substrate.

[0009]

[Action]

 In the device according to the first aspect, the deletion region is provided between the plurality of input / output electrodes formed on the circuit board to reduce the parasitic capacitance generated between the input / output electrodes. As a result, the characteristics of the dielectric filter mounted on the circuit board can be improved.

According to a second aspect of the present invention, a plurality of connections formed on an adapter for connecting each input / output electrode on the dielectric filter side and each input / output electrode on the circuit board side having different arrangement intervals from each other. By providing a deletion region between the connection electrodes, the parasitic capacitance generated between the connection electrodes is reduced. As a result, the characteristics of the dielectric filter attached to the adapter can be improved.

[0011]

【Example】

 First, the structure of a circuit board according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, input / output electrodes 11 and 12 are formed on one main surface 1a of the circuit board 1. The dielectric filter 1 is mounted on the input / output electrodes 11 and 12. The configuration up to this point is similar to that of FIG. The feature of this embodiment is that a plurality of circular through-holes 13 are formed substantially in the center on a straight line connecting the input / output electrodes 11 and 12.

By providing the through hole 13 as described above in the circuit board 1, an air barrier is formed between the input / output electrodes 11 and 12. Since the relative permittivity εo of air is much lower than the relative permittivity εs of the circuit board 1, the value of the parasitic capacitance Ca (see FIG. 4) generated between the input / output electrodes 11 and 12 is extremely small. Therefore, the capacitive inductance between the input / output electrodes 11 and 12 becomes large, and the leak amount of the high-frequency signal flowing between the input / output electrodes 11 and 12 is significantly reduced. As a result, the attenuation characteristic of the dielectric filter 1 can be significantly improved as compared with the circuit boards shown in FIGS. 3 and 4.

Next, the configuration of the mounting adapter according to the embodiment of the present invention will be described with reference to FIG. In FIG. 2, in the approximate center of the straight line connecting the connecting electrodes 31 and 32 formed on the insulating substrate of the adapter 3, in the direction perpendicular to the straight line connecting the connecting electrodes 31 and 32. A substantially elliptical through hole 33 is formed. The through hole 33 acts in the same manner as the through hole 22 described above, and reduces the value of the parasitic capacitance Cb (see FIG. 6) generated between the connecting electrodes 31 and 32. Therefore, the capacitive inductance between the connecting electrodes 31 and 32 becomes large, and the leak amount of the high-frequency signal flowing between the input / output electrodes 31 and 32 is significantly reduced. As a result, the attenuation characteristic of the dielectric filter 1 can be significantly improved as compared with the circuit boards shown in FIGS. As in the embodiment of FIG. 1, if the through hole 13 is formed between the input / output electrodes 11 and 12 also in the circuit board 1, the attenuation characteristic of the dielectric filter 1 can be further improved.

The through hole 13 is formed on a straight line connecting the input / output electrodes 11 and 12, and the through hole 33 is formed on a straight line connecting the connecting electrodes 31 and 32 in order to improve the characteristics of the dielectric filter. Most preferably, the invention is not limited to this, and the through holes may be formed at other positions. Further, the shape of the through hole is not limited to the circular shape or the elliptical shape as in the above embodiment, but may be other shapes. Further, the number of through holes provided is not limited to that in the above embodiment.

[0015]

[Effect of device]

 According to the first aspect of the present invention, the parasitic capacitance generated between the input / output electrodes is remarkably reduced by providing the removal region between the plurality of input / output electrodes formed on the circuit board. The characteristics of the dielectric filter mounted on the circuit board can be greatly improved.

According to the second aspect of the invention, a plurality of connections formed on the adapter for connecting the input / output electrodes on the dielectric filter side and the input / output electrodes on the circuit board side, which are arranged at different intervals, from each other. By providing the deleted region between the connection electrodes, the parasitic capacitance generated between the connection electrodes is significantly reduced, so that the characteristics of the dielectric filter mounted on the adapter can be significantly improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view illustrating a configuration of a circuit board according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view for explaining a configuration of an adapter according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view showing an example of a mounting structure of a dielectric filter.

FIG. 4 is a cross-sectional view showing an example of a dielectric filter mounting structure.

FIG. 5 is an exploded perspective view showing another example of the mounting structure of the dielectric filter.

FIG. 6 is a cross-sectional view showing another example of the mounting structure of the dielectric filter.

[Explanation of symbols]

 1: Circuit board 11, 12: Input / output electrode 13: Through hole 2: Dielectric filter 21, 22: Input / output electrode 3: Adapter 31, 32: Connection electrode 33: Through hole

Claims (2)

[Scope of utility model registration request] 1. A circuit board in which a dielectric filter is mounted on one main surface thereof, and a plurality of input / output electrodes connected to the dielectric filter are formed on one main surface thereof. A circuit board, wherein a deletion region is provided between each of the input / output electrodes in order to reduce a parasitic capacitance generated between the writing and outputting electrodes. 2. An adapter, which is mounted on a dielectric filter when the dielectric filter is mounted on a circuit board, comprising: an insulating substrate; In order to reduce the parasitic capacitance generated between the connection electrodes, a plurality of connection electrodes for mutually connecting the input / output electrodes on different dielectric filter sides and the input / output electrodes on the circuit board side are provided. An adapter for mounting a dielectric filter, characterized in that a deletion region is provided between each of the connecting electrodes on the insulating substrate.