JPH0681102U - Dielectric filter - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the positional deviation of the mounting on the wiring board and support the automatic mounting machine. [Structure] The short side of the five dielectric coaxial resonators 1 to 5 is aligned linearly, and the front surface of the cover 27 and the base substrate 22 are arranged.
And the distance b ′ between the short sides of the dielectric coaxial resonators 1 to 5 and the edge of the base substrate 22 are the same (a ′ = b ′). By setting a ′ = b ′, the distances a and b of the cover 27 and the dielectric coaxial resonators 1 to 5 mounted on the base substrate 22 with respect to the center line CL become equal (a = b). Therefore, when the cover 27 and the dielectric coaxial resonator 3 are sandwiched by the positioning claw, the center of the cover 27 and the dielectric coaxial resonator 3 can be aligned with the center line CL of the dielectric filter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dielectric filter used in mobile communication devices such as car phones and mobile phones.

[0002]

[Prior art]

 10 and 11 show dielectric filters used in mobile communication devices such as car phones and mobile phones. This conventional dielectric filter is composed of a base substrate 22 whose outer shell is a dielectric substrate, and a metal cover 27 which covers the upper surface of the base substrate 22. Moreover, this dielectric filter is used as a so-called antenna duplexer of a duplexer type composed of a band elimination filter and a bandpass filter.

The base substrate 22 is formed in a flat plate shape, and on its upper surface, quarter-wavelength type dielectric coaxial resonators (seven dielectric coaxial resonators in this example) 1 to 7 constituting a filter. Is being implemented multiple times. As other components, a chip capacitor, a coil-shaped inductance, etc. are mounted. The cover 27 is mounted on the upper surface of the base substrate 22 by soldering or the like so as to cover these electronic circuit components.

As shown in FIG. 10C, an electrode film-shaped input / output terminal 23 connected to the antenna and an electrode film-shaped input / output terminal connected to the receiving side are provided on the back surface of the base substrate 22. 25 and an electrode film-shaped input / output terminal 24 connected to the transmitter side are formed. A ground electrode 26 in the form of an electrode film is formed on the entire back surface of the base substrate 22 except the input / output terminals 23 to 25.

The input / output terminals 23 to 25 are connected to the electrode film on the upper surface side through an electrode film provided in a semicircular through hole formed on the end surface of the base substrate 22. Further, the ground electrode 26 is an earth electrode on the upper surface side via an electrode film provided in a semicircular through hole formed on the end surface of the base substrate 22 and a plurality of through holes formed in the base substrate 22. Connected with.

The dielectric filter is of a surface mounting type which is mounted on the upper surface of the wiring board on the user side by an automatic mounting machine, positioned, and mounted by soldering or the like. As shown in FIGS. 10 (a) and 11, such a dielectric filter has a structure in which a plurality of dielectric coaxial resonators 1 to 7 are mounted on the base substrate 22 and the dielectric coaxial resonators 1 to 7 are removed from the cover 27. The end of 7 is mounted so as to protrude.

Here, the dielectric coaxial resonators 1 to 7 are formed on the surface of the dielectric body and the electrode film-shaped inner conductor formed on the inner peripheral surface of the hole of the dielectric body formed in a rectangular parallelepiped shape. It is composed of an electrode film-shaped outer conductor and resonates at a predetermined frequency. Into the holes of the dielectric coaxial resonators 1 to 7, metal connection terminals each having one end side formed in a substantially cylindrical shape are press-fitted, respectively, and contact with the inner conductor in the holes to obtain conduction. . In addition, the surface of the dielectric coaxial resonators 1 to 7 on which the connection terminal is press-fitted is an open surface on which the outer conductor is not formed, and the surface on the side where the connection terminal is not press-fitted is formed of a conductor. It is a short-circuited surface (short-circuited surface).

The short surfaces that are the ends of the dielectric coaxial resonators 1 to 7 are exposed from the cover 27 because the electrode film on the short surfaces is shaved to adjust the frequency of the resonator. . In this case, when a plurality of dielectric coaxial resonators 1 to 7 are mounted on the base substrate 22, the short-circuit side of the dielectric coaxial resonators 1 to 7 is not uniform as shown in FIGS. Then, when viewed from above, it was not a straight line, but was a rattling uneven shape.

[0009]

[Problems to be solved by the device]

 When such a conventional dielectric filter is automatically mounted on a wiring board by an automatic mounting machine, there are problems as described below. For convenience of explanation, a dielectric filter using five dielectric coaxial resonators as shown in FIG. 12 will be described. FIG. 13 shows a case in which the dielectric filter is sandwiched by the positioning claw 40 of the automatic mounting machine, and the dielectric filter is sucked by the suction nozzle 41 from above to be automatically mounted on the wiring board.

Here, when the positioning claw 40 of the automatic mounting machine is thicker than the dielectric filter, when the positioning claw 40 sandwiches the dielectric filter from both sides, the base substrate 22 of the dielectric filter 22 Can be sandwiched by the positioning claw 40, and in this case, centering can be performed when the dielectric filter is mounted on the wiring board. That is, when the dielectric filter is sandwiched by the positioning claws 40, the center line between the positioning claws 40 and the center line of the dielectric filter must match.

In FIG. 12, CL indicates the center line of the dielectric filter, and in FIG. 12B, the dimensions A and B on both sides of the center line CL are A = B. However, as shown in FIG. 12 (a), the short side surfaces of the dielectric coaxial resonators 1 to 5 are arranged in a non-uniform manner, and the cover 27 does not cover the center line CL of the dielectric filter. Is not equal to the dimension a to the front surface of the dielectric coaxial resonator 3 (a <b in this example).

In addition, as described above, in the related art, as shown in FIG. 13, the distance S between the suction nozzle 41 and the positioning claw 40 may be as short as about 1.5 mm by the mechanical mounting method using the automatic mounting machine. In such a case, when the base substrate 22 cannot be sandwiched by the positioning claw 40 and the cover 27 and the dielectric coaxial resonator 3 are sandwiched by the positioning claw 40, due to the above relationship of a <b, the attracted center and dielectric There was a problem that the center of the filter was displaced and the positioning of the dielectric filter mounted on the wiring board was also displaced.

The present invention has been made in view of the above points, and provides a dielectric filter aiming to cope with an automatic mounting machine by eliminating the displacement of mounting on a wiring board. Is.

[0014]

[Means for Solving the Problems]

 The present invention is a dielectric substrate consisting of a base substrate, dielectric coaxial resonators arranged in parallel on the upper surface of the base substrate, and a cover that covers the dielectric coaxial resonators and is mounted on the upper surface side of the base substrate. A body filter, in which the positioning claws of the automatic mounting machine sandwich the dielectric filter cover or the dielectric coaxial resonator from both sides, and the upper surface of the cover is sucked by the suction nozzle, and the automatic mounting machine performs the dielectric filter. In a dielectric filter that is mounted on a wiring board, the center of a member such as a dielectric coaxial resonator or a cover mounted on the upper surface of the base board is aligned with the center of the base board.

Further, according to a second aspect of the present invention, the end portions of the dielectric coaxial resonator project from the end portions of the cover, and the surfaces of the end portions of these dielectric coaxial resonators are aligned in a straight line. The device is arranged on the base substrate, and the center of the size including the cover and the dielectric coaxial resonator is aligned with the center of the base substrate.

Further, in claim 3, the entire dielectric coaxial resonator is covered with a cover, and the center of the cover and the center of the base substrate are aligned with each other.

[0017]

[Action]

 According to the present invention, since the center of the member such as the dielectric coaxial resonator or the cover mounted on the upper surface of the base substrate is aligned with the center of the base substrate, the suction nozzle of the automatic mounting machine is When the distance between the positioning claw and the positioning claw is short, the dielectric filter can be centered even if the positioning claw sandwiches the cover or the dielectric coaxial resonator. Therefore, even when the automatic mounting machine picks up the dielectric filter and mounts it on the wiring board, the mounting position of the dielectric filter does not shift, and it can be used with an automatic mounting machine that has a mechanical positioning method. It is possible to reduce the implementation cost.

According to a second aspect of the present invention, the end portions of the dielectric coaxial resonator project from the end portions of the cover, and the surfaces of the end portions of these dielectric coaxial resonators are aligned in a straight line. By placing the device on the base substrate and aligning the center of the dimensions including the cover and the dielectric coaxial resonator with the center of the base substrate, the suction nozzle and positioning claw of the automatic mounting machine When the distance is short, the centering of the dielectric filter is possible even if the cover and the dielectric coaxial resonator are sandwiched by the positioning claws of the automatic mounting machine. Therefore, as in the case of claim 1, even when the dielectric filter is sucked and mounted on the wiring board by the automatic mounting machine, the mounting position of the dielectric filter does not shift, and the mechanical positioning method is used. It can also be used with its own automatic mounting machine and can reduce the mounting cost.

Further, according to claim 3, the entire dielectric coaxial resonator is covered with the cover, and the center of the cover and the center of the base substrate are aligned with each other. When the distance between the nozzle and the positioning claw is short, the centering of the dielectric filter is possible even if the positioning claw of the automatic mounter sandwiches the cover on both sides. Therefore, as in the case of claims 1 and 2, even when the dielectric filter is adsorbed and mounted on the wiring board by the automatic mounting machine, the mounting position of the dielectric filter does not shift, and the mechanical position is mechanical. It can also be used with an automatic mounting machine that has a positioning method, and can reduce mounting costs.

[0020]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the overall structure of the dielectric filter to which the present invention is applied will be described. FIG. 7 shows an exploded perspective view of the dielectric filter, and FIG. 8 shows a perspective view of a state in which various parts are mounted. The dielectric filters shown in FIGS. 7 and 8 are used, for example, in mobile communication devices such as automobile telephones and mobile phones, and are so-called antenna duplexers used in the microwave band. .

The dielectric filter has a band elimination filter on the transmitting side and a band pass filter on the receiving side. First, the overall structure of this surface mount type dielectric filter will be described with reference to FIGS. The band elimination filter has a three-stage resonator configuration and has three quarter-wave dielectric coaxial resonators 1 to 3, and the bandpass filter has a four-stage resonator configuration and four resonators. 1/4 wavelength type dielectric coaxial resonators 4 to 7.

The dielectric coaxial resonators 1 to 7 are electrode film-shaped inner conductors formed on the inner peripheral surface of the hole 8 of the dielectric body formed in a rectangular parallelepiped shape, and electrodes formed on the side surface of the dielectric body. It is composed of a film-shaped outer conductor and a short-circuit conductor (not shown) formed on one of the end faces where the hole 8 is opened to short-circuit the inner conductor and the outer conductor, and resonates at a predetermined frequency. It is supposed to do. Into the holes 8 of the dielectric coaxial resonators 1 to 7, metal connection terminals 9 each having one end side formed in a substantially cylindrical shape are press-fitted from the open end sides of the dielectric coaxial resonators 1 to 7, respectively. Conductivity is obtained by contacting the inner conductor inside. The other end side of the connection terminal 9 is formed in a tongue shape and is connected to the electrode films 14 to 17 formed on the upper surfaces of the capacitor substrates 10 to 12 and the coupling substrate 13 described later by soldering or the like. It is like this.

The capacitor substrates 10 to 12 are made of a dielectric material, and electrode films are respectively formed on the upper and lower surfaces thereof to form capacitors. In addition, a plurality of electrode films 14 to 17 are juxtaposed on the upper surface of the coupling substrate 13 made of a dielectric material. The electrode films 14 to 16 have comb-shaped opposing portions in order to increase the coupling capacitance. Has been done. Furthermore, electrode films are formed on both sides of the lower surface of the combined substrate 13. Further, coil-shaped inductors L _{1 to} L ₃ are connected between the capacitor substrates 10 to 12. Electrode films 19 and 20 are formed on the upper surface of a coupling substrate 18 made of a dielectric material on which the inductors L _{1 to} L ₃ are mounted. The lower surface of the coupling substrate 18 has an electrode film serving as a ground electrode over the entire surface. Has been formed.

An electrode film-shaped input / output terminal 23 connected to the antenna side and an electrode film-shaped input / output terminal 24 connected to the transmitter side are provided on the base substrate 22 on which the above-mentioned members are mounted. An input / output terminal 25 in the form of an electrode film to which the receiving portion side is connected is formed. Further, the upper and lower surfaces of the base substrate 22 are formed with electrode film-shaped ground electrodes 26 over substantially the entire surface. The base substrate 22 is made of a dielectric material or an insulating material. The coupling substrate 13 mounted on the upper surface of the base substrate 22 is mounted via two spacers 21, and the other one spacer 21 is mounted on the upper surface of the input / output terminal 24 of the base substrate 22. It These three spacers 21 are made of a conductive material such as metal.

The cover 27 that covers the base substrate 22 is made of metal, and the top plate of the cover 27 is used for soldering the upper surface side conductors of the dielectric coaxial resonators 1 to 7 and the cover 27. And an elongated hole 28 and a hole 29 for inserting a jig for adjusting the characteristics of the dielectric coaxial resonators 1 to 7 are formed. Further, a plurality of ground terminals 30 are formed, which are connected to the upper surface ground electrode 26 of the base substrate 22 from the front and back portions (not shown) of the lower edge of the cover 27. Notches 31 for exposing the input / output terminals 23 to 25 of the base substrate 22 are formed on the side plates of the cover 27, respectively. Further, as shown in FIG. 8, a label 32 is attached to the upper surface of the cover 27 to cover the holes 28 and 29.

The label 32 is made of a resin called Kapton (trade name) having high heat resistance. When the label 32 is made of resin, it does not function as a shield, but when it has a shield function, it is made of metal.

Next, the arrangement configuration of each member will be described. As shown in FIGS. 7 and 8, on the band elimination filter side, one spacer 21 is mounted on the input / output terminal 24 of the base substrate 22, and the coupling substrate 18 is the input / output of the base substrate 22. It is mounted and soldered on the ground electrode 26 between the terminals 24 and 23. Further, the spacers 21 are mounted on the upper surfaces of the input / output terminals 23 and 25, respectively, and the combined substrate 13 is bridged and soldered on the upper surfaces of the two spacers 21 so that the electrode films on the lower surfaces are in contact with each other.

As shown in FIG. 8, one end of the inductor L ₁ is mounted on the upper surface of the spacer 21, the capacitor substrate 10 is mounted thereon, and the dielectric coaxial resonator 1 is mounted on the electrode film on the upper surface of the capacitor substrate 10. Is connected to the connection terminal 9. The other end of the inductor L ₁ is mounted on the electrode film 19 of the coupling substrate 18, and the inductor L ₂ is mounted between the electrode films 19 and 20 of the coupling substrate 18. Then, the capacitor substrate 11 is mounted on the connecting portion between the inductors L ₁ and L ₂ , and the connection terminal 9 from the dielectric coaxial resonator 2 is connected to the electrode film on the upper surface of the capacitor substrate 11. One end of the inductor L ₃ is mounted on the electrode film 20 of the coupling substrate 18, and the other end is mounted on the input / output terminal 23. Further, the capacitor substrate 12 is mounted on the connection portion between the inductors L ₂ and L ₃ , and the connection terminal 9 from the dielectric coaxial resonator 3 is connected to the electrode film on the upper surface of the capacitor substrate 12.

The connection terminals 9 from the dielectric coaxial resonators 4 to 7 are connected to the electrode films 14 to 17 on the upper surface of the coupling substrate 13 mounted on the two spacers 21, respectively. ing.

Further, the ground electrodes 26 are formed on the entire upper and lower surfaces of the base substrate 22 except the portions of the input / output terminals 23 to 25. The ground electrodes 26 on the upper and lower surfaces are laterally aligned in a straight line. Conduction is obtained by the plurality of through holes 33 formed. Further, the ground electrodes 26 on the upper and lower surfaces are also electrically connected through the electrode film formed on the end surface of the semicircular cutout 34 formed around the base substrate 22. Further, the input / output terminals 23 to 25 are also electrically connected to the upper and lower surfaces of the base substrate 22 via the electrode films formed on the end faces.

FIG. 9 shows an equivalent circuit diagram of the dielectric filter configured as described above. Capacitors C _{1 to} C ₃ on the band elimination filter side are the upper and lower electrode films of the capacitor substrates 10 to 12. The capacitor C ₄ is formed between the input / output terminal 24 and the ground electrode on the lower surface. The capacitors C ₅ and C ₆ are formed by the electrode films 19 and 20 on the upper surface of the coupling substrate 18 and the electrode film on the lower surface. Further, the capacitor C ₇ is formed between the input / output terminal 23 and the ground electrode on the lower surface.

The capacitor C ₈ on the bandpass filter side is formed between the electrode film 14 of the coupling substrate 13 and the electrode film on the lower surface, and the capacitors C _{9 to} C ₁₀ are the electrode films of the coupling substrate 13. It is formed between 14 and 16. Further, the capacitor C ₁₁ is formed by the electrode film 16 on the upper surface and the electrode film (not shown) on the lower surface of the combined substrate 13. The electrode film on the lower surface is electrically connected to the spacer 21 at the right end in the figure. Further, the capacitor C ₁₂ is formed by the electrode film 17 on the upper surface and the electrode film on the lower surface of the combined substrate 13. The dielectric coaxial resonator 7 and the capacitor C ₁₂ form a trap circuit of a series resonance circuit.

Next, the gist of the present invention will be described in detail. The dielectric filters shown in FIGS. 7 to 9 have been described with respect to an example using seven dielectric coaxial resonators. Here, as shown in FIG. 1, five dielectric coaxial resonators are used. A dielectric filter using 1 to 5 will be described. In this embodiment, as shown in FIG. 1A, the short side of the five dielectric coaxial resonators 1 to 5 is aligned linearly, and the front surface of the cover 27 and the edge portion of the base substrate 22 are aligned. The distance a ′ is the same as the distance b ′ between the short surfaces of the dielectric coaxial resonators 1 to 5 and the edge of the base substrate 22 (a ′ = b ′).

By setting a ′ = b ′ in this manner, as shown in FIG. 1B, the cover 27 mounted on the base substrate 22 and the center line C of the dielectric coaxial resonators 1 to 5 are mounted. Distances a and b with respect to L are equal (a = b). Therefore, when the cover 27 and the dielectric coaxial resonator 3 are sandwiched by the positioning claws, the center thereof and the center line CL of the dielectric filter can be matched.

Example 2 As an application example of the previous example, as shown in FIG. 2, even when the short surfaces of the dielectric coaxial resonators 1 to 5 are not aligned, the positioning claw 40 of the automatic mounting machine is Since it contacts the dielectric filter on the center line, the dielectric coaxial resonator 3 at the center projects in the short-circuit direction more than other dielectric coaxial resonators, and the front surface of the cover 27 and the base substrate. If the distance a ′ from the edge of 22 and the distance b ′ between the short surface of the dielectric coaxial resonator 3 and the edge of the base substrate 22 are the same (a ′ = b ′), the dielectric filter Can be centered.

Third Embodiment FIG. 3 shows a third embodiment in which a rear plate 27b is integrally bent and formed on the rear surface side of the cover 27, and the dielectric coaxial resonators 1 to 5 are covered by the rear plate 27b. It was done. The distance a'between the front plate 27a of the cover 27 and the edge of the base substrate 22 is made equal to the distance b'between the rear plate 27b of the cover 27 and the edge of the base substrate 22. In this case as well, the distance a to the front plate 27a of the cover 27 and the distance b to the rear plate 27b of the cover 27 with respect to the center line CL of the dielectric filter become equal, and the front plate 27a and the rear plate of the cover 27 become equal. When sandwiched with the positioning claw 27b, the centering of the dielectric filter can be achieved.

Example 4 Example 4 is shown in FIG. FIG. 4 is a perspective view of the dielectric coaxial resonators 1 to 5 as seen from the short side, in which the rear plate 27c of the cover 27 is provided at the center of the dielectric coaxial resonators 3 and 4. . In this embodiment, since the short-circuit surface sides of the dielectric coaxial resonators 1 to 5 are exposed from the cover 27, the resonator can be adjusted as usual.

(Fifth Embodiment) FIG. 5 shows a fifth embodiment, which is different from the case shown in FIG. 3 in that a hole 42 is formed in the top plate and the rear plate 27b of the cover 27. Also in this case, since the short-circuit surfaces of the dielectric coaxial resonators 1 to 5 are exposed, the resonators can be adjusted.

Sixth Embodiment FIG. 6 shows a sixth embodiment, which is a substantially L-shaped rear plate 27d. Also in this case, since the short-circuit surfaces of the dielectric coaxial resonators 1 to 5 are exposed, the resonators can be adjusted.

In the above fourth to sixth embodiments, the distance between the front surface of the cover 27 and the base substrate 22 and the distance between the rear surface of the cover 27 and the edge portion of the base substrate 22 are set equal to each other so that centering is achieved. I have to.

In the above embodiments, an example of an antenna duplexer in which a bandpass filter and a band elimination filter are combined is shown as a filter configuration. However, a single configuration of a bandpass filter or a band elimination filter, or The present invention can be applied to other high-pass filters and low-pass filters, or to a combination of the filters. Further, the number of resonator stages is not limited.

[0042]

[Effect of device]

 According to the present invention, the base substrate, the dielectric coaxial resonators arranged side by side on the upper surface of the base substrate, and the cover that covers the dielectric coaxial resonators and is mounted on the upper surface side of the base substrate. In this dielectric filter, the positioning claws of the automatic mounting machine sandwich the dielectric filter cover or the dielectric coaxial resonator from both sides, and the upper surface of the cover is sucked by the suction nozzle, and In a dielectric filter in which the filter is mounted on the wiring board, the center of the dielectric coaxial resonator or cover mounted on the upper surface of the base board and the center of the base board are aligned. When the distance between the suction nozzle and the positioning claw of the automatic mounting machine is short, even if the cover or the dielectric coaxial resonator is sandwiched by the positioning claw, the dielectric flux Centering of the filter is possible. Therefore, even when a dielectric filter is picked up and mounted on a wiring board by an automatic mounting machine, the mounting position of the dielectric filter does not shift, and it can be used with an automatic mounting machine that has a mechanical positioning method. The effect is that the cost can be reduced.

According to the second aspect, the end portions of the dielectric coaxial resonator project from the end portions of the cover, and the surfaces of the end portions of these dielectric coaxial resonators are aligned so that the dielectric coaxial resonance is linear. By placing the device on the base substrate and aligning the center of the dimensions including the cover and the dielectric coaxial resonator with the center of the base substrate, the suction nozzle and positioning claw of the automatic mounting machine When the distance is short, the centering of the dielectric filter is possible even if the cover and the dielectric coaxial resonator are sandwiched by the positioning claws of the automatic mounting machine. Therefore, as in the case of claim 1, even when the dielectric filter is sucked and mounted on the wiring board by the automatic mounting machine, the mounting position of the dielectric filter does not shift, and the mechanical positioning method is used. It can also be used with its own automatic mounting machine and can reduce the mounting cost.

Further, according to claim 3, the entire dielectric coaxial resonator is covered with the cover, and the center of the cover and the center of the base substrate are aligned with each other. When the distance between the nozzle and the positioning claw is short, the centering of the dielectric filter is possible even if the positioning claw of the automatic mounter sandwiches the cover on both sides. Therefore, as in the case of claims 1 and 2, even when the dielectric filter is adsorbed and mounted on the wiring board by the automatic mounting machine, the mounting position of the dielectric filter does not shift, and the mechanical position is mechanical. It can also be used with an automatic mounting machine that has a positioning method, and can reduce mounting costs.

[Brief description of drawings]

FIG. 1A is a plan view of a dielectric filter according to an embodiment of the present invention. (B) is a side view of the dielectric filter of the Example of this invention.

FIG. 2 is a plan view of a dielectric filter according to a second embodiment of the present invention.

FIG. 3A is a plan view of a dielectric filter according to a third embodiment of the present invention. (B) is a side view of the dielectric filter of Example 3 of this invention.

FIG. 4 is a perspective view of a dielectric filter according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view of a dielectric filter according to a fifth embodiment of the present invention.

FIG. 6 is a perspective view of a dielectric filter according to a sixth embodiment of the present invention.

FIG. 7 is an exploded perspective view of the entire dielectric filter of the present invention.

FIG. 8 is a perspective view of a dielectric filter showing a mounted state of an embodiment of the present invention.

9 is an equivalent circuit diagram of the dielectric filter shown in FIG. 7 of the present invention.

FIG. 10A is a plan view of a conventional dielectric filter. (B) is a front view of a conventional dielectric filter. (C) is a rear view of the conventional dielectric filter.
(D) is a side view of the conventional dielectric filter.

FIG. 11 is a perspective view of a conventional dielectric filter.

FIG. 12A is a plan view of a conventional dielectric filter. (B) is a side view of the conventional dielectric filter.

FIG. 13 is an explanatory diagram of a case where a conventional dielectric filter is attracted by an automatic mounting machine and automatically mounted on a wiring board.

[Explanation of symbols]

 1 to 7 dielectric coaxial resonator 22 base substrate 27 cover 40 positioning claw 41 suction nozzle

Claims (3)

[Scope of utility model registration request] 1. A dielectric comprising a base substrate, dielectric coaxial resonators arranged in parallel on an upper surface of the base substrate, and a cover which covers the dielectric coaxial resonators and is mounted on the upper surface side of the base substrate. In the body filter, the positioning claws of the automatic mounting machine sandwich the dielectric filter cover or the dielectric coaxial resonator from both sides, and the upper surface of the cover is sucked by the suction nozzle, and the dielectric mounting filter is mounted by the automatic mounting machine. In a dielectric filter designed to be mounted on a wiring board,
A dielectric filter characterized in that the center of a member such as a dielectric coaxial resonator or a cover mounted on the upper surface of a base substrate is made to coincide with the center of the base substrate. 2. The dielectric coaxial resonator is arranged on a base substrate so that the end portions of the dielectric coaxial resonator project from the end portions of the cover and the surfaces of the end portions of these dielectric coaxial resonators are aligned. 2. The dielectric filter according to claim 1, wherein a center of a size including the cover and the dielectric coaxial resonator is aligned with a center of the base substrate. 3. The dielectric filter according to claim 1, wherein the entire dielectric coaxial resonator is covered with a cover, and the center of the cover is aligned with the center of the base substrate.