WO2002084780A1

WO2002084780A1 - Antenna coupling system of resonator and coupled antenna

Info

Publication number: WO2002084780A1
Application number: PCT/JP2002/003065
Authority: WO
Inventors: Kuniyoshi Nakada
Original assignee: Nec Corporation
Priority date: 2001-03-30
Filing date: 2002-03-28
Publication date: 2002-10-24
Also published as: JP2002299909A; TW554568B

Abstract

An antenna coupling system for exciting a resonator composed of a resonant rod in a case and a coupled antenna. The antenna coupling system comprises a coupled antenna (13) having one end (19) connected to the supply terminal for supplying a high-frequency signal and the other end (20)serving as an open terminal and an adjustment screw (17) for adjusting the inductive coupling degree of the coupled antenna and the resonant rod. With this constitution, an antenna coupling system for readily adjusting the degree of inductive coupling with high precision and with wide range of variation of the degree of inductive coupling.

Description

Description Resonator antenna coupling method and coupling antenna

The present invention relates to a first-stage coupling method of a filter device having a semi-coaxial resonator and the like, and in particular, can be manufactured with high accuracy and low cost, is suitable for mass production, and adjusts the amount of electromagnetic coupling. The present invention relates to a resonator antenna coupling method and a coupling antenna having a structure that facilitates the above. Background technology ''

Conventionally, as a first-stage coupling method of a high-frequency signal that is composed of a semi-coaxial resonator and supplies a high-frequency signal to a filter device having a resonance rod, a tap coupling method, a coupling rod method, an antenna coupling method, and the like for the resonance rod are used. Are known.

1A and 1B show the configuration of a resonator having a filter device based on a tap coupling method, and FIG. 1A is a horizontal sectional view on a plane orthogonal to the longitudinal direction of the resonance rod. FIG. 1B is a longitudinal sectional view taken along the line IB-IB in FIG. 1A. ·

The filter device 70 is composed of a plurality of adjacent resonators having a resonance rod 75, and has a structure in which adjacent resonators 74 are cascaded through an opening 76, and the opening and closing of the resonators is performed. This is a multi-stage semi-coaxial resonator hermetically sealed by a not-shown partition as a possible cover.

This resonator is disposed in an insulated state on the outer wall of the end of the first-stage resonator in the longitudinal direction of the filter device 70 based on tap coupling; ^, and an input terminal (connector) 71 to which a high frequency signal is supplied is connected The base end is connected to the input terminal 71, and the end penetrates the outer wall. A conductor rod or lead wire (hereinafter also referred to as a conductor rod) 72 inserted into the interior of the first-stage resonator 74 and covered with an insulating material or the like; The tip is connected to the resonance rod 75 directly or via a conductor 73 by soldering or the like, and a high-frequency signal is supplied to the resonance rod 75 from the conductor rod 72.

The method of adjusting the coupling strength of the high-frequency signal to the resonance rod 75 in the tap coupling method includes a method of adjusting the connection position at the tip of the conductor rod 72 soldered to the resonance rod 75 and a method of adjusting the tap shape. (The wiring shape of the lead wire 73) is used.

FIG. 2A and FIG. 2B are diagrams showing the configuration of a resonator having a filter device based on the coupling rod system. FIG. 2A is a horizontal sectional view in a plane orthogonal to the resonance rod, and FIG. The figure is a longitudinal sectional view taken along the line ΠB-ΠB in FIG. 2A. Like FIG. 1A and FIG. 1B, an example of the configuration of the filter device and the input section of the high-frequency signal is shown. The tip of the conductor rod έ2 whose base end is connected to the input terminal 81 penetrates the outer wall and is inserted inside the first-stage resonator 84. The distal end of the conductor rod 82 is arranged in parallel with the first-stage resonance rod 85 and connected to a part of a coupling rod 83 erected from a partition wall on the bottom side of the resonator by soldering or the like. The high-frequency signal is electromagnetically coupled from the coupling rod 83 to the resonance rod 85 and is excited. The coupling strength can be adjusted by adjusting screws 87 screwed into the lid and placed on the coupling rods 83.

FIGS. 3 and 3 are diagrams showing the configuration of a resonator having a filter device based on the coupling rod system. FIG. 3A is a horizontal sectional view on a plane orthogonal to the resonance rod, and FIG. FIG. 3B is a longitudinal sectional view taken along a line IE B—EI B in FIG. 3A. Like FIG. 1A and FIG. 1B or FIG. 2A and FIG. 2B, a configuration example of a filter device and a high frequency signal input section is shown. The tip of a conductor rod 92 whose base end is connected to the input terminal 91 penetrates the outer wall and is inserted inside the first-stage resonator 94. Conductor rod An antenna 93 is arranged at the tip of 92, and a high-frequency signal is electromagnetically coupled from the antenna 93 to the first-stage resonance rod 95 to excite it. The coupling strength can be adjusted by an adjusting screw 97 screwed into the lid and installed on the antenna 93.

4A to 4C are diagrams showing various shapes of the antenna 93. FIG. The antenna has a predetermined shape with a conductor connected from the input terminal 91 to the tip of the conductor rod 82 inserted into the interior of the first-stage resonator 94, and is made of a metal material cylinder (disk). (Fig. 4), Ripon (rod) shape (Fig. 4B), bent plate shape (Fig. 4C), etc. Generally, as shown in these figures from the viewpoint of manufacturing accuracy. A relatively simple shape is adopted.

In the first-stage coupling method of the conventional filter device, the tap coupling method shown in Fig. 1A and Fig. 1B has the advantage that it is easy to obtain a large amount of coupling. There is no other method but to change the soldering position and tap shape. Therefore, after opening the filter cover, it is necessary to change the tap shape or change the soldering position, which requires a lot of adjustment man-hours and increases the cost. (Connector) 71 is connected to the grounded resonant rod, so there is a problem in that when DC voltage is applied to the input terminal, a separate DC force means is required.

In the connection rod method shown in Fig. 2A and Fig. 2B, the connection strength can be adjusted by the amount of adjustment screw 87 screwed into the upper cover of connection rod 83. is there. However, the connecting rod method has a problem in that the adjustable range of the bonding strength is narrow. Also, as with the tap coupling method, when applying a DC voltage to the input terminal, there is a problem in that a separate DC cut is required.

Further, in the antenna system shown in FIGS. 3A and 3B, the antenna 93 connected to the input terminal 91 is not grounded, so that a DC voltage is applied to the input terminal 91 when the DC voltage is applied to the input terminal. There is an advantage that there is no need to provide cutting means. Also, the bonding strength Can be adjusted by an adjusting screw 97 screwed near the antenna 93. However, in general, in the antenna system, the variable range of adjustment of the coupling amount is not only the same as that of the coupling rod system, but also it is difficult to adjust, and there is a problem in terms of high cost and manufacturing accuracy.

Therefore, the present invention is intended to provide a resonator antenna coupling method and a coupling method that can widen the variable range of the amount of electrical coupling at the input part of the resonator, easily adjust the coupling strength, and reduce the manufacturing cost. The purpose is to provide a binding antenna.

Another object of the present invention is to provide an antenna coupling method and a coupling antenna for a resonator using an insulating substrate formed of a conductor pattern having high precision and high reproducibility of Q ext characteristics. Ming disclosure

In order to achieve the above object, according to a first main aspect of the present invention, there is provided an antenna coupling method for exciting a resonator having a resonance rod provided upright inside a housing, comprising: One end connected to the supply end of the housing and the other end serving as an open end, the one end being connected to the supply end of the high-frequency signal, A first conductor portion extending upward is disposed, and a second conductor portion extending in the vicinity of the resonance rod and extending in parallel with the direction in which the resonance rod is erected is provided on the other end side. A coupling antenna formed of a U-shaped or J-shaped conductor, wherein a third conductor for connecting the first and second conductors to each other is arranged in a horizontal direction;

In order to adjust the amount of electromagnetic coupling between the second conductor portion and the resonance rod in the coupling antenna, an adjustment screw inserted through the housing from the outside and inserted near the first conductor portion is provided. An antenna coupling scheme for a resonator is provided.

The antenna coupling method for the resonator described in the first main mode has the following sub mode. Varying the amount of electromagnetic coupling by adjusting screw insertion according to the difference between the length of the first conductor and the length of the second conductor in the coupled antenna, and the length of the portion of the second conductor that makes contact with the resonance rod A range can be set.

The U-shaped or J-shaped conductor is composed of a ribbon-shaped metal conductor or a conductor pattern formed on an insulating substrate.

The resonator is a first-stage resonator of a filter device configured by cascading a plurality of resonators in multiple stages.

Further, the U-shaped or J-shaped conductor is arranged in a plane substantially orthogonal to the longitudinal direction of the filter device.

In order to achieve the above object, according to a second main object of the present invention, according to a second aspect of the present invention, a resonance rod erected inside a housing and inserted from the outside of the housing toward the vicinity of the open end side of the resonance rod. A coupling antenna for exciting a resonator having an adjustment screw, the coupling antenna having one end connected to a supply end of a high-frequency signal and having the other end being an open end; At the end, a first conductor connected to the supply end of the high-frequency signal and extending toward the upper side of the housing is arranged, and at the other end, near the resonance rod. A second conductor portion extending in parallel with the direction in which the resonance rod is erected, and a third conductor portion connecting the first and second conductor portions to each other in a horizontal direction. Provided coupling antenna for resonator characterized by consisting of U-shaped or J-shaped conductor arranged It is.

The coupling antenna for the resonator described in the second main mode has the following sub mode.

A resonator is a first-stage resonator of a filter device configured by cascading a plurality of resonators in multiple stages. Further, the U-shaped or J-shaped conductor is arranged in a plane substantially orthogonal to the longitudinal direction of the filter device.

As is apparent from the above embodiments, the present invention is directed to a u-shaped or

By using a coupling antenna composed of a J-shaped conductor, the variable range of the amount of electromagnetic coupling is expanded and QeXt characteristics that can be easily adjusted are realized. In addition, by forming a U-shaped or J-shaped conductor as a conductor pattern on an insulating substrate, it is easy to manufacture complex antenna patterns, and the antenna shape and repeatability of Q e Xt characteristics And improve accuracy. BRIEF DESCRIPTION OF THE FIGURES

Fig. 1A and Fig. 1B are a horizontal sectional view 'and a vertical sectional view, respectively, showing a conventional tap coupling method.

Fig. 2A and Fig. 2B are a horizontal sectional view and a vertical sectional view, respectively, showing a conventional connecting rod method.

Fig. 3A and Fig. 3B are a horizontal sectional view and a vertical sectional view, respectively, showing a conventional antenna system.

4A to 4C are diagrams showing various examples of the shape of the antenna, respectively. FIGS. 5A to 5C show one embodiment according to the present invention, and FIG. Fig. 5B is a longitudinal section taken along line VB-VB in Fig. 5A, Fig. 5C is a longitudinal section taken along line VC-VC in Fig. 5A. FIG.

6A to 6C are diagrams showing examples of various conductor shapes of the coupling antenna, respectively. 'FIGS. 7A to 7F show another embodiment according to the present effort. Fig. 7A is taken along the horizontal section in Fig. 7B and Fig. 7B is taken along the line in Fig. 7A. 7C is a longitudinal sectional view taken along line WC- ¹ in FIG. 7A, and FIGS. 7D to 7F are antennas formed on an insulating substrate, respectively. It is a diagram showing three examples of the conductor pattern shape of the

FIG. 8 shows a change in the electromagnetic coupling amount (Q ext) between the coupling antenna and the resonance rod due to the adjustment of the position of the adjustment screw in the first or second embodiment of the present invention, in comparison with the conventional example. A graph, and

FIG. 9A and FIG. 9B show still another embodiment according to the present invention. FIG. 9A is a block diagram showing the configuration, and FIG. 9B is a horizontal sectional view thereof. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of a resonator antenna coupling system and a coupling antenna according to the present invention will be described in detail with reference to the accompanying drawings. 5A to 5C show a first embodiment according to the present invention, FIG. 5A is a horizontal sectional view thereof, and FIG. 5B is a sectional view taken along a line VB-VB in FIG. 5A. FIG. 5C is a longitudinal sectional view obtained along a line VC-VC in FIG. 5A.

As shown in FIGS. 5A to 5C, in the antenna coupling method of the resonator according to the first embodiment, the filter device 10 includes a plurality of semi-coaxial resonators surrounded by a housing. 14 have a structure of being cascaded with each other through an opening 16, and form a multi-stage configuration of a semi-coaxial resonator which is closed by an openable and closable lid (cover) constituting an upper partition (not shown). Each semi-coaxial resonator 14 is provided with a resonance rod 1'5 which stands substantially at the center from the bottom of the housing and has an open front end.

The input of the high-frequency signal in the first embodiment was installed on the wall of the first-stage resonator 14 arranged at one end in the longitudinal direction of the casing of the filter device 10 in an insulated state from the outer wall. High frequency signal input terminal (connector) 1 1 and input terminal 1 at base end 1 is connected to the conductor rod 1 2 inserted into the inside of the resonator by penetrating the housing in an insulated state with the housing by being coated with an insulating material, etc., and connected to the tip of the conductor rod 12 This is performed via a resonance rod 15 inside the resonator 14 and a coupling antenna 13 which is electromagnetically coupled.

As shown in FIG. 5C, the coupling antenna 13 in the first embodiment has an end (pattern) 19 to which a high-frequency signal is supplied and another end which is an open end from the end 19. U-shape or J-shape extending to the end (free end) 20 and having at least the free end 20 side a straight conductor arranged on a plane parallel to the vicinity of the standing surface of the resonator rod 15 of the resonator It consists of a mold conductor.

More specifically, on one end 19 side, a first conductor 13a connected to the tip of a conductor rod 12 for supplying a high-frequency signal and extending upward from the housing is arranged. On the other end side, a second conductor portion 13b is disposed near the resonance rod 15 and extending in parallel with the direction in which the resonance rod 15 is erected.第三 The third conductor 13c that connects the second conductors to each other is made of a U-shaped or J-shaped conductor that is arranged horizontally. That is, the coupling antenna 13 is a conductor bent in a U-shape or a J-shape from the end (pattern) 19 connected to the tip of the conductor rod 12, preferably orthogonal to the longitudinal direction of the filter device. The conductor is a U-shaped or J-shaped conductor in the plane of the conductor, and the substantially linear portion of the U-shaped or J-shaped conductor having the free end 20 is substantially the same as the standing surface of the resonance rod 15. It has a shape arranged on parallel surfaces.

Further, in the first embodiment, as a means for adjusting the electromagnetic coupling amount between the coupling antenna 1 1 and the resonance rod 15, as shown in FIGS. 5 結合 to 5C, an adjustment screw 17 is provided. It is screwed through the upper partition of the filter device 10. Further, the adjusting screw 17 is preferably in the vicinity of a conductor arranged on the end 19 side connected to the conductor rod 12 of the coupling antenna 13 which is preferably a U-shaped or J-shaped conductor, It is arranged so as to be parallel to the conductor. 6A to 6C are diagrams showing various examples of the shape of the coupled antenna according to the first embodiment. The U-shaped antenna shape shown in Fig. 6A and the J-shaped antenna shape shown in Fig. 6B and Fig. 6C are used as the antenna shape. . The electromagnetic coupling amount (electromagnetic coupling strength) is determined as shown in FIGS. 6iA to 6C according to the shape of the antenna.

One end of the coupled antenna 13 is connected to a conductor rod (the center conductor of the lead wire) 12 from the input terminal 11, and the other straight conductor having an open end (free end) is a first-stage resonance rod 15. It is installed adjacent to and parallel to this, and is electromagnetically coupled from the coupling antenna 13 to the first-stage resonance rod 13 for excitation. Further, an adjusting screw 17 is arranged near the conductor of the coupling antenna 13 on the side connected to the input terminal 11, and the position of the adjusting screw 17 ′ (the position inside the resonator 14 The amount of electromagnetic coupling (intensity or weakness of electromagnetic coupling) can be increased or decreased by adjusting the adjustment screw 17 (insertion amount).

Since the coupling antenna 13 of the first embodiment is not in contact with the outer wall (housing) of the resonance rod 15 ゃ filter device 10, even when a DC voltage is applied to the input terminal, the DC cut is not applied. There is also an inherent advantage of the antenna coupling method that there is no need to provide a separate antenna. In the above-described first embodiment, an example in which the U-shaped or J-shaped antenna is realized by an elongated ribbon (rod) conductor made of a metal material has been described. However, as another embodiment, a plate-like 緣 substrate is used. It is also possible to arrange a similar antenna shape as a conductor pattern. 7A to 7C show, as a second embodiment relating to the coupled antenna of the present invention, an example in which the antenna is constituted by a conductor pattern on an insulating substrate.

The substrate on which the antenna is disposed (antenna substrate) 38 is formed of an insulating substrate, and is formed on one surface thereof, and has an end (pattern) 39 to which a high-frequency signal is supplied, and an open end from the end 39. U-shaped or J-shaped conductor having a free end (free end) 40 and a straight conductor arranged at least on the free end side in parallel with and adjacent to the resonance rod 35 of the resonator. Pattern (antenna) 3 3, preferably in a plane perpendicular to the longitudinal direction of the filter device The conductor pattern (antenna) 33 on the antenna substrate 38 in FIG. A conductor rod 32 connected to the input terminal 31 is inserted into the antenna substrate 38 via a through hole from the substrate surface opposite to the surface on which the conductor pattern 33 is formed. 2 is connected to the conductor pattern 33 by soldering or the like.

The high-frequency signal is directly supplied to the conductor pattern 33 via the input terminal (connector) 31 and the conductor rod 32, and the conductor pattern 33 of the antenna board 38 and the common rod 35 are electromagnetically coupled. To excite. Since the antenna substrate 38 is not in contact with the resonance rod 35 or the outer wall (housing) of the filter device 30, a DC voltage is applied to the input terminal 31 as in the first embodiment described above. In this case, there is no need to provide DC cutting means. FIG. 7C shows the arrangement relationship between the conductor pattern on the antenna substrate, the resonance rod, and the adjustment screw. In other words, the arrangement relationship with the antenna substrate and other components as viewed from the resonance rod 35 is shown. In this example, the conductor pattern of the coupled antenna is a J-shaped conductor, and one end 39 of the J-shaped conductor pattern is connected to the tip of the conductor rod 32 by soldering and the other end. The linear conductor having the portion (free end) 40 is arranged in parallel close to the resonance rod 35, and this linear conductor participates in electromagnetic coupling with the first-stage coupling rod. An adjustment screw 37 is provided on a straight conductor having an end 39, and the position of the adjustment screw 37 (the amount of the adjustment screw 17 inserted into the resonator 14) is adjusted to achieve electromagnetic coupling. It is possible to increase or decrease the amount (the strength of electromagnetic coupling). Only the conductor pattern 33 constituting the antenna is formed on the antenna substrate 38, and no ground is provided unlike a normal wiring substrate. An adjustment screw 37 is provided above and near the conductor rod (center conductor) 32 connected to the input terminal, which is indicated by a dotted line in the figure, to enable adjustment of the amount of electromagnetic coupling.

It goes without saying that the conductor pattern 33 of the coupled antenna in the second embodiment can be a conductor pattern having the shape shown in FIGS. 7D to 7F. In the first embodiment shown in FIGS. 5A to 5C, when a U-shaped or J-shaped coupling antenna 13 is used, the amount of electromagnetic coupling between the coupling antenna 13 and the first-stage resonance rod 15 is adjusted. The methods include (1) changing the shape of the antenna as shown in, for example, FIGS. 6A to 6C, and (2) changing the distance between the coupling antenna 13 and the first-stage resonance rod 15 of the filter. (3) The position of the adjustment screw 17 near the coupling antenna 13 can be adjusted by a technique such as adjusting the position.

Next, a description will be given below of a coupling operation of high frequency signals, a coupling characteristic, and adjustment thereof in the coupling method of the quilt device according to the first or second embodiment.

The first conductor 13a (or 33a) of the U-shaped or J-shaped coupling antenna 13 (or 33) is connected to the center conductor of the conductor rod 1 (or 32) from the input terminal 11 (or 31). The electromagnetic energy supplied from the input terminal 11 (or 31) is connected by soldering or the like, and the electromagnetic energy supplied from the first conductor 13a (or 33a) of the U-shaped or J-shaped coupled antenna is It flows to the two conductors 13b (or 33b). Since the second conductor 13b (or 33b) of the coupling antenna 13 (or 33) is arranged close to and parallel to the resonance rod 15 (or 35), the first-stage resonance rod 15 ( Or 35), and the first-stage resonator is excited.

As shown in FIGS. 6A to 6C, the strength of the coupling caused by the excitation in the second conductor portion 13b (or 33b) of the coupling antenna 13 (or 33) is determined by the resonance rod 15 (or 35b). ), The length of the adjacent gap, the length of the first conductor 13a (or 33a), etc. can be controlled. The adjustment is performed by adjusting the position of the adjusting screw 17 (or 37) provided near the first conductor 13a (or 33a) of the coupling antenna connected to the terminal 11 (or 31).

When adjusting the amount of electromagnetic coupling with the adjusting screw 17 (or 37), the first conductor 13a (or 33a) of the coupled antenna is inserted by inserting the adjusting screw 17 (or 37). The electromagnetic coupling amount becomes weaker as the overlapping portion of the adjusting screw becomes longer. This is because the adjustment screw 17 (or 37) affects the electromagnetic energy passing through the first conductor 13a (or 33a) of the antenna and the second conductor 13b ( Or 33 b) suppresses the electromagnetic energy that reaches it. Since the amount of suppression by this adjusting screw 17 (or 37) is quite large, electromagnetic noise can be obtained by placing the coupling antenna 13 (or 33) close to the first-stage resonance rod 15 (or 35). It is possible to widen the variable range of the coupling amount.

FIG. 8 is a graph showing a difference in filter characteristics between the first or second embodiment of the present invention and the conventional example. The horizontal axis is the insertion amount of the adjusting screw, and the vertical axis is the Q ext (external Q) representing the electromagnetic coupling amount. Here, the larger the value of Q e Xt, the weaker the electromagnetic coupling, and the smaller the value, the stronger the electromagnetic coupling.

As shown in Fig. 8, in the conventional example, the value of QeXt tends to decrease according to the amount of adjustment screw inserted into the coupling antenna, and while the amount of adjustment screw insertion is small, It has a filter characteristic that the amount of change in Q e Xt is small and the amount of change increases as the amount of insertion increases.

On the other hand, in the case of the U-shaped or J-shaped coupled antenna according to the present invention, the value of Q e Xt tends to increase in accordance with the insertion amount of the adjusting screw inserted in parallel with the coupled antenna. In addition, the filter has a filter characteristic in which the amount of change in QeXt is large in a region where the adjustment screw insertion amount is large, the insertion amount is small, and the change amount in the region is small. In particular, the variable width for the entire value of Q e Xt is more than three times that of the conventional example (the variable width of the electromagnetic coupling amount is also more than three times). As described above, the variable width of the entire value of Qext can be set by designing the shape of the U-shaped or J-shaped coupling antenna. As described above, when the U-shaped or J-shaped coupled antenna according to the present invention is used, “the change amount of Q e Xt is smaller as the insertion amount of the coupling screw decreases, and Large in the weak region, that is, the relationship is opposite to the filter characteristics of the conventional example. By the way, the usual method of adjusting the filter characteristics is to weaken the electromagnetic coupling of the high-frequency signal to the first-stage resonator once and then gradually increase it to obtain the optimal amount of electromagnetic coupling in the filter characteristics In this way, the insertion amount of the adjustment screw is adjusted.

Therefore, as in the conventional example, the start point of the adjustment is larger than the change amount of QeXt at the end point of the adjustment (the area where the Qext is small) than the start point of the adjustment (the area where the Qext is large). It is clear that the variation can be adjusted more easily if the variation of Q e Xt is larger at the end and the variation of Q ext is smaller at the end point of the adjustment. It can be understood from FIG. 8 that the adjustment of the filter device using the U-shaped or J-shaped coupling antenna of the present invention is much easier than the filter characteristics of the conventional example.

In the example shown in FIG. 8, the desired Q e Xt for the filter device is designed to be about 20. The variable range of Q ext in the conventional example is about 10 to 34, and the maximum range is about Q ext = 34. On the other hand, in the U-shaped or J-shaped coupled antenna according to the present invention, the variable range of Q e X t can be up to about 15 to 80 or more. It is possible to increase the value of Q e Xt to more than twice that of the conventional example.

According to the above-mentioned filter characteristics of the U-shaped or J-shaped coupling antenna of the present invention, the adjusting screw is inserted deeply and then the insertion amount is reduced, so that the electromagnetic coupling amount is reduced from about Q ext = 80. It is possible to perform at once a delicate adjustment of the target QeXt = 20 or so, in which the amount of change in the amount of electromagnetic coupling is small. Although the first-stage coupling system of the present invention has been described as being applied to a filter device, it can be applied to a device in which filters are combined, such as a duplexer device and a triplexer device. Hereinafter, an example of a duplexer device will be described as a third embodiment.

FIG. 9A is a block diagram showing a basic configuration of a duplexer device. Duplexer devices transmit and receive signals between a single transmitting and receiving antenna and a transmitting and receiving circuit. This is a high-frequency circuit that also has a filter function to operate without causing mutual interference. As shown in Fig. 9A, the antenna connection terminal 61 connected to the transmission / reception antenna, the transmission connection terminal 68 connected to the output of the transmission circuit, and the reception terminal connected to the input of the reception circuit A connection terminal 69 is provided, and the antenna connection terminal 61 is connected to a branch point of the T branch, and the T branch is connected to the transmission connection terminal 68 via the filter 1 which is a band pass filter on the transmission side. Similarly, they are connected to the reception connection terminals 69 via the bandpass filter 2 on the reception side.

FIG. 9B is a horizontal cross-sectional view showing an example in which the present invention is applied to a duplexer device using a semi-coaxial resonator having a cylindrical (cylindrical) shape as a resonator. The filter device 60 has a plurality of cylindrical semi-coaxial resonators 64 between the transmitting / receiving antenna side terminal 61 and the transmitting and receiving circuit side terminals 68, 69 via an opening 66. And has a δ structure that can be combined. In addition, each semi-coaxial resonator has a resonance rod 65 with a length of L g ο / 4 (λ go: high-frequency guide wavelength), the length of the semi-coaxial resonator standing at the center from the bottom. I have. .

In the third embodiment, an antenna substrate 63 having a U-shaped or J-shaped conductor pattern formed on a first-stage resonator of a semi-coaxial resonator having two parallel-arranged filter units is provided. Implemented. Between the antenna substrate 63 and the terminal 61 on the transmitting / receiving antenna side, an insulating coating conductor is inserted so as to form a T-branch along a groove or the like formed in advance. The two antenna substrates 63 are arranged so as to be electromagnetically coupled to the first-stage resonance rod 65 of each semi-coaxial resonator. In addition, it is also possible to arrange a U-shaped or J-shaped antenna conductor instead of the antenna substrate 63.

The filter device 60 has a structure in which the upper part of the filter is hermetically sealed by an upper lid (not shown). An adjustment screw whose tip position can be adjusted is screwed into the vicinity. Also in the third embodiment, the same connection as in the first or second embodiment is performed. It is possible to adopt a method of adjusting the amount, and particularly in the case of adjusting with the adjusting screw, the adjustment can be easily performed because the removal of the upper lid is not necessary. In addition, since the conductor forming the antenna on the substrate is formed in advance as a predetermined pattern, the manufacturing accuracy is high and the reproducibility is high as compared with tap coupling or the like.

As still another embodiment according to the present invention, a metal wire is used in place of the ribbon as the U-shaped or J-shaped conductor or the conductor pattern on the substrate in the first to third embodiments. It is possible. By using a metal wire, it is possible to easily adjust the U-shaped or J-shaped shape. In addition, as the insulating substrate in the second and third embodiments, a plate-like insulator such as a film plate, a styrene foam plate, and a plastic plate can be used. Further, the conductor pattern of the antenna substrate may be a u-shaped or a modified r-shaped shape. Industrial applicability

As described above, the antenna coupling method of the resonator according to the present invention forms the coupling antenna with a U-shaped or J-shaped conductor shape. Since it can be twice as wide, it is easy to adjust the amount of electromagnetic coupling and resonance characteristics. .

Also, in addition to being able to increase the variable range of the electromagnetic coupling amount, it is also possible to realize a filter characteristic with a small amount of change in a region approaching the desired electromagnetic coupling amount by the adjusting screw. The change amount is small, and fine adjustment in the area can be easily performed and obtained. Therefore, the number of adjustment steps can be reduced, and the cost of the filter device using the resonator is reduced, which is suitable for mass production, which leads to an improvement in productivity.

In addition, since the coupled antenna of the present invention can be configured with a conductor pattern formed on a substrate, various shapes of the U-shaped or J-shaped coupled antenna can be formed with a high-precision conductor pattern. It is possible to form a high-precision coupled antenna with good reproducibility in the shape and characteristics at the time of manufacturing the coupled antenna, and at low cost. Furthermore, since the coupling antenna of the present invention does not come into contact with the housing (filter case) of the resonance rod and filter device, even when DC is applied to the input terminal, there is no need to provide a separate DC cut means. This is superior to a configuration that requires

Claims

1) Scope of billing

1. An antenna coupling method for exciting a resonator having a resonance rod set up inside a housing,

A first end connected to the supply end of the high-frequency signal and an other end serving as an open end, the one end side being connected to the supply end of the high-frequency signal, and an upper side of the housing; A first conductor part extending toward the resonance rod is disposed on the other end side, and a second conductor part extending near the resonance rod and extending parallel to the direction in which the resonance rod is erected is disposed on the other end side. A coupling antenna formed of a U-shaped or J-shaped conductor in which a third conductor connecting the first and second conductors to each other is arranged in a horizontal direction;

An adjusting screw inserted through the housing from the outside and inserted in the vicinity of the first conductor to adjust the amount of electromagnetic coupling between the second conductor and the resonance rod in the coupling antenna; An antenna coupling method for a resonator, comprising:

2. The adjustment is made according to the difference between the length of the first conductor portion and the length of the second conductor portion in the coupling antenna, and the length of the portion of the second conductor portion that makes a contact with the resonance rod. 2. The antenna coupling method for a resonator according to claim 1, wherein a variable range of the electromagnetic coupling amount according to an insertion amount of the screw is set.

3. The antenna coupling method for a resonator according to claim 1, wherein the U-shaped or J-shaped conductor is formed of a ripon-shaped metal conductor.

4. The antenna coupling method for a resonator according to claim 1, wherein the U-shaped or J-shaped conductor is constituted by a conductor pattern formed on an insulating substrate. '

5. The resonator according to claim 1, wherein the resonator is a first-stage resonator of a filter device configured by cascading a plurality of resonators in multiple stages. Antenna coupling method.

6. The antenna for a resonator according to claim 5, wherein the U-shaped or J-shaped conductor is disposed in a plane substantially orthogonal to a longitudinal direction of the filter device. Combination method.

7. A coupling antenna for exciting a resonator including a resonance rod erected inside the housing and an adjustment screw inserted from the outside of the housing toward the vicinity of the open end of the resonance rod,

A first end connected to the supply end of the high-frequency signal and an other end serving as an open end; the one end being connected to the supply end of the high-frequency signal; A first conductor portion extending upward is arranged, and a second conductor portion extending beside the resonance rod and extending parallel to the direction in which the resonance rod is erected is provided on the other end side. A third conductor portion disposed to connect the first and second conductor portions to each other is made of a U-shaped or J-shaped conductor arranged in a horizontal direction. Coupling antenna for resonator.

8. The coupling antenna for a resonator according to claim 7, wherein the U-shaped or J-shaped conductor is formed of a ribbon-shaped metal conductor. 9. The coupling for a resonator according to claim 7, wherein the U-shaped or J-shaped conductor is constituted by a conductor pattern formed on an insulating substrate. Antenna.

10. The coupled antenna for a resonator according to claim 7, wherein the resonator is a first-stage resonator of a filter device configured by cascading a plurality of resonators in multiple stages. .

11. The coupling for a resonator according to claim 10, wherein the U-shaped or J-shaped conductor is disposed in a plane substantially orthogonal to a longitudinal direction of the filter device. antenna. -