JP2003204202A - Production method for dielectric resonator filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production method for a dielectric resonator filter which is excellent in frequency characteristics and has a widened a control range. <P>SOLUTION: The dielectric resonator filter is provided with a dielectric resonator 111 and a casing 120 having a main body 121 of the casing, a casing lid 122 and an inter-step coupling control component 123. Then, on the outer lateral sides of partitions 123a-123c in contact with the inner lateral sides of the main body 121 of the casing, inter-step coupling control windows 124a-124c are respectively formed by providing transverse slits from the outer lateral sides of the partitions 123a-123c. The inter-step coupling control component is formed by assembling boards formed with the inter-step coupling control windows beforehand or the inter-step coupling control windows are formed by forming the inter-step coupling control component and fitting beams onto these partitions later. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a dielectric resonator filter used as a reception filter, a transmission filter, an antenna duplexer or the like in a mobile communication base station.

[0002]

2. Description of the Related Art Conventionally, in a mobile communication base station such as a mobile phone, a band pass filter (band pass filter) for passing only a signal in a specific frequency band.
Is used. For example, in the receiving system, a receiving filter is used to remove signals from communication systems that use other frequency bands, and in the transmitting system, transmission is performed to prevent unnecessary radio waves from being transmitted to systems that use other frequency bands. A filter is used. Such a filter for a base station has a low loss enough to secure reception sensitivity and power efficiency as a base station, and is a steep filter in order to cope with a narrowing of the interval with the frequency band of an adjacent communication system. It is required to have characteristics and to be small and lightweight in order to facilitate installation on the tower top.
As a filter satisfying such requirements, there is a dielectric resonator filter configured by coupling a plurality of dielectric resonators, and various shapes have been proposed.

FIG. 17 is a perspective view schematically showing an example of a conventional four-stage dielectric resonator filter. As shown in FIG. 17, this conventional dielectric resonator filter includes four cylindrical dielectric resonators 611a to 611d formed by sintering dielectric powder. In this example, the four dielectric resonators 611a to 611d operate as a four-stage bandpass filter. The housing 620 of the dielectric resonator filter includes a housing main body 621 formed of a bottom wall and a side wall, a housing lid 622, and partition walls connected to each other for partitioning a space surrounded by the housing main body 621 into a small room. 623a to 623d. Each of the dielectric resonators 611a to 611d has a housing 620.
One is provided in each small room partitioned by the partition walls 623a to 623d. Also, four partition walls 623a
Between the three partition walls 623a to 623c among the partition walls 623a to 623d and the side wall of the housing body 621, interstage coupling adjustment windows 624a to 624c for establishing electromagnetic field coupling between the resonators are provided. Interstage coupling adjustment bolts 631a to 631c for adjusting the coupling strength of the electromagnetic field coupling between the resonators are arranged in the interstage coupling adjustment windows 624a to 624c. Further, the housing main body 621 is provided with input / output terminals 641 and 642 by coaxial connectors for inputting and outputting high frequency signals from the outside.
Input / output coupling probes 651, 65 are provided on the central conductor of
2 is connected.

Further, the housing lid 621 is provided for adjusting the resonance frequency of each of the dielectric resonators 611a to 611d.
Resonant frequency adjusting member 66 in which a disk and a bolt are integrated
1a to 661d are attached. The resonance frequency adjusting members 661a to 661d are arranged such that their central axes are in the same plane position as the central axes of the dielectric resonators 611a to 611d (that is, concentric positions).

[0005]

However, the above-mentioned conventional dielectric resonator filter has the following problems.

In the above-mentioned conventional dielectric resonator filter, unnecessary harmonic components are generated in a band having a frequency higher than the pass band of the filter due to coupling of higher-order modes different from the fundamental resonance mode of the dielectric resonator. There is a problem of doing. Originally, a component having a frequency higher than the pass band is removed by the low pass filter, but there is an upper limit on the level of the signal that can be removed by the low pass filter.
Therefore, in a filter for a base station of a mobile phone and the like, in addition to the specifications of the pass band, strict specifications are set regarding this harmonic component, and the level of the harmonic component must be suppressed.

FIG. 18 is a diagram showing an example of frequency characteristics of a conventional four-stage dielectric resonator filter. As shown in the figure, in the above-mentioned conventional dielectric resonator filter,
There is a possibility that a high frequency component of a level (for example, −40 dB or more) that cannot be removed even by the low pass filter is generated. The present inventors believe that the cause is a lack of the adjustment function of interstage coupling.

An object of the present invention is to provide means for suppressing the level of harmonic components in the filter characteristic,
It is to realize a method for manufacturing a dielectric resonator filter having excellent frequency characteristics and a wide adjustment range.

[0009]

According to a first method of manufacturing a dielectric resonator filter of the present invention, a dielectric resonator at an input stage for receiving a high frequency signal from an external device and an output for outputting a high frequency signal to the external device. A plurality of dielectric resonators including a stepped dielectric resonator, a casing that surrounds the plurality of dielectric resonators and functions as an electromagnetic field shield, an input high frequency signal, and a dielectric of the input step. An input coupling means for coupling an electromagnetic field with the body resonator to each other; an output coupling means for coupling an output high frequency signal and an electromagnetic field with the dielectric resonator in the output stage to each other; and the plurality of dielectric resonators. A method of manufacturing a dielectric resonator filter, which is provided between dielectric resonators in which electromagnetic fields are coupled to each other, and includes an interstage coupling adjustment component for adjusting electromagnetic field coupling strength, at least: Cut into one area A step (a) of forming at least one plate member having a groove portion; and, after the step (a), by assembling the at least one plate member and the housing body, The step (b) of forming the housing body is included.

According to this method, a filter function for a frequency region higher than the pass band (or stop band) is provided according to the current distribution of the plate of the interstage coupling adjustment component, such as providing a cut portion at a position where the current density is high. An enhanced dielectric resonator filter is formed. Since the dielectric resonator filter is formed by assembling at least one plate member in which the cut portion is formed in advance, the process can be rapidly advanced.

A second method for manufacturing a dielectric resonator filter according to the present invention is a dielectric resonator at an input stage for receiving a high frequency signal from an external device and a dielectric resonator at an output stage for outputting a high frequency signal to the external device. A plurality of dielectric resonators including, a casing that surrounds the plurality of dielectric resonators and functions as an electromagnetic field shield, an electromagnetic wave of an input high frequency signal and the dielectric resonator of the input stage Input coupling means for coupling the fields to each other, output coupling means for coupling the output high frequency signal and the electromagnetic fields of the dielectric resonator of the output stage to each other, and among the plurality of dielectric resonators A method for manufacturing a dielectric resonator filter, which is provided between dielectric resonators to be coupled with each other, and which includes an interstage coupling adjustment component for adjusting electromagnetic field coupling strength, comprising: Main part and the main body After assembling the step (a), after the step (a), at least one of the upper beam and the lower beam is attached to the outer surface of the region having the inter-step adjusting function of the main part of the inter-step coupling adjusting part. Accordingly, the step (b) of forming the interstage adjusting plate having the cut portion is included.

According to this method, the upper beam or the lower beam can be easily replaced with one having a different size, and the shape can be easily changed by a cutting tool such as a luteer. Therefore, the area of the interstage coupling adjustment window can be easily changed, and the adjustment range of the interstage coupling can be expanded.

The cut portion of the interstage coupling adjusting component may have a substantially quadrangular shape, but it is preferable that the notch has a substantially rectangular shape arranged so that its long side is substantially parallel to the bottom surface of the housing. .

Further, it is preferable that the notch of the inter-stage coupling adjusting component is arranged so that a position in the height direction of the housing is substantially aligned with a position where the dielectric resonator is arranged. It is preferably formed so as to be in contact with the inner side surface of the wall forming the outer peripheral portion of the housing.

The plurality of dielectric resonators are all TE01
With the δ-mode resonator, the effect of the present invention can be remarkably exhibited.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a perspective view schematically showing the structure of a dielectric resonator filter according to a first embodiment of the present invention. As shown in FIG. 1, the dielectric resonator filter of the present embodiment includes four cylindrical dielectric resonators 111a to 111d formed by sintering dielectric powder. Each dielectric resonator 11
The resonance frequencies of 1a to 111d are determined by the height and diameter of the cylindrical shape. In this example, the four dielectric resonators 111a to 111d operate as a four-stage bandpass filter. The case 120 of the ferroelectric filter includes a case body 121 composed of a bottom wall and a side wall, and a case lid 122.
And the inter-stage coupling adjustment component 123 composed of partition walls 123a to 123d that partition the space surrounded by the housing body 121 into small chambers. Each of the dielectric resonators 111a to 111d includes the housing 12
One is provided in each small room partitioned by 0 partitions 123a to 123d. Further, the housing body 121 is provided with an input terminal 141 and an output terminal 142 by a coaxial connector for inputting and outputting a high frequency signal from the outside, and the center conductors of the input terminal 141 and the output terminal 142 are An input coupling probe 151 and an output coupling probe 152 are connected to each other.

Further, the housing lid 122 is provided for adjusting the resonance frequency of each of the dielectric resonators 111a to 111d.
Resonant frequency adjusting members 161a to 161d in which a circular conductor plate and a bolt connected to the circular conductor plate are integrated are attached. The resonance frequency adjusting members 161a to 161d
Of the dielectric resonators 111a to 111a.
It is arranged so as to be in the same plane position as the central axis of 1d (that is, in a concentric position). That is, the housing lid 122 is provided with screw holes at positions substantially concentric with the cylindrical dielectric resonators 111a to 111d, and each resonance frequency adjusting member 16 is provided.
The bolts 1a to 161d are engaged with the screw holes of the housing lid 122. Then, the resonance frequency adjusting members 161a to 16
By rotating 1d about the axis, the gap between the conductor plate and the dielectric resonators 111a to 111d is changed,
The resonance frequency can be adjusted.

Generally, in a dielectric resonator filter, frequency characteristics such as pass band width and attenuation characteristics are determined by the resonance frequency of each resonator, the Q value, the coupling amount between each dielectric resonator, etc. For example, the shape of each dielectric resonator is calculated from the specifications of the frequency characteristics of the filter. However, in reality, the designed filter characteristics cannot be obtained due to the shape error and the mounting error of the dielectric resonator and the housing. Therefore, the above-mentioned conventional dielectric resonator filter is provided with resonance frequency adjusting members 161a to 161d, and each dielectric resonator 1 is provided.
A desired filter characteristic is realized by making the resonance frequencies of 11a to 111d variable.

Here, the feature of this embodiment is that three of the four partition walls 123a to 123d are three partition walls 123a to 123d.
c is an interstage coupling adjustment window 124a-12 for establishing electromagnetic field coupling between the dielectric resonators 111a-111d.
4c is provided. Interstage coupling adjustment window 124
a to 124c, the partition walls 123a to 123c are the case body 1
In the portion that contacts the inner surface of 21 (that is, the outer surface),
The partition walls 123a to 123c are formed by forming cuts in the lateral direction from the outer surface of each of the partition walls 123a to 123c. In other words, the four partition walls 1 that form the inter-stage coupling adjustment component 123.
Three partition walls 123a to 123c of 23a to 123d
However, it has an interstage coupling adjustment function.

Then, the inter-stage coupling adjusting windows 124a-12d constituted by the notches of the partition walls 123a-123c.
4c includes inter-stage coupling adjustment bolts 131a to 13 for finely adjusting the coupling strength of electromagnetic field coupling between the resonators.
1c is provided. This inter-stage coupling adjustment bolt 131
The a to 131c are arranged so as to protrude inside the cutouts of the partition walls 123a to 123c, respectively.

Next, the operation of the dielectric resonator filter having the structure will be described. For example, a high frequency signal transmitted from a signal source or an antenna (not shown in FIG. 1) is input into the housing 120 from the input terminal 141, but the high frequency signal is a signal having a frequency within the pass band of the filter. In this case, due to the action of the input coupling probe 151, the high frequency signal is coupled with the electromagnetic field mode of the dielectric resonator 111a at the input stage to excite the fundamental resonance mode TE01δ. This resonance mode is sequentially coupled to the next-stage dielectric resonators 111b, 111c, ... Through the inter-stage coupling adjustment windows 124a, 124b, ..., And the electromagnetic field mode excited in the dielectric resonator 111f is By coupling with the output coupling probe 152 on the output side, a high frequency signal is output from the output terminal 142. On the other hand, a high frequency signal outside the pass band of the filter cannot be combined with the resonance mode of the dielectric resonator and is reflected, so that the input terminal 14
It is sent back from 1.

In order to realize the accurate operation as the filter as described above, each of the dielectric resonators 111a to 111a.
d of the resonance frequency and the interstage coupling adjustment windows 124a to 124c.
The strength of the interstage coupling due to must be realized exactly. However, the dielectric resonators 111a to 111d and the housing 1
Due to the shape error of 20 and the mounting error, the filter characteristics as designed cannot be obtained. Therefore, the resonance frequency adjusting member 1
61a to 161d are provided, and the conductor plate is moved up and down by rotating the bolts of the resonance frequency adjusting members 161a to 161d. As a result, the conductor plates of the resonance frequency adjusting members 161a to 161d and the dielectric resonator 11 below.
Since the distance from 1a to 111d changes, the resonance frequency of each dielectric resonator 111a to 111d changes.

Further, the interstage coupling adjusting window 124 provided in the partition walls 123a to 123c functioning as the interstage coupling adjusting plate.
a-124c and interstage coupling adjustment bolts 131a-131c
Are used to adjust the strength of the electromagnetic field coupling between the dielectric resonators 111a-111d. First, the partition wall 123a-
The inter-stage coupling strength is roughly determined by the area of the inter-stage coupling adjusting windows 124a to 124c formed by the notch portion of 123c, and the inter-stage coupling strength can be finely adjusted by the insertion amount of the inter-stage coupling adjusting bolts 131a to 131c. is there. By adjusting these adjusting mechanisms, the frequency and bandwidth of the pass band of the dielectric resonator filter are determined.

FIG. 2 is a diagram showing frequency characteristics of the dielectric resonator filter of this embodiment. In the case of a high frequency signal outside the pass band of the dielectric resonator filter, basically the fundamental resonance mode of the dielectric resonator cannot be excited and reflected,
It is sent back from the input terminal 141. Therefore, the frequency characteristic of the dielectric resonator filter is basically a bandpass characteristic as shown in FIG. However, in addition to the TE01δ mode, which is the fundamental resonance mode, the HE11δ mode and the EH11δ mode, which are higher-order modes, exist in the dielectric resonator, and even when coupling by these resonance modes, the high-frequency signal passes through the filter, the passband Unwanted harmonic peaks may appear on the high frequency side.

FIG. 3 is a diagram showing an analysis result of the electric field distribution at 2.14 GHz (pass band) of the conventional dielectric resonator filter shown in FIG. 17 by the FDTD method, which is parallel to the bottom surface of the housing and , In the cross section that passes through the center of the resonator in the height direction (the same analysis results will be displayed in all subsequent cross sections)
The electric field distribution at is shown. The arrow in the figure indicates the electric field vector at that position. The dielectric resonator filter used to obtain the data of FIG. 3 is made of a dielectric material having a relative dielectric constant of 41 in the structure shown in FIG.
A resonance frequency adjusting member having a columnar ferroelectric resonator having a diameter of 25 mm and a height of 11 mm and a casing having four cubic chambers each having an inner dimension of 40 mm on a side is provided. The lower surface of the dielectric resonator is located 14.5 mm from the bottom surface of the housing body.

As is clear from the electric field pattern in the dielectric resonator having the electric field distribution shown in FIG. 3, in the conventional dielectric resonator filter, the TE01δ mode which is the fundamental mode is excited in the passband frequency band. .

FIG. 4 is a diagram showing an analysis result of the electric field distribution at 2.82 GHz (harmonic) of the conventional dielectric resonator filter shown in FIG. 17 by the FDTD method. In the electric field pattern shown in Fig. 4, higher-order modes of the dielectric resonator such as HE11δ mode and EH11δ mode are seen, and harmonics of the dielectric resonator filter are generated by the higher-order mode of the dielectric resonator. I understand.

FIG. 5 shows the flow on the dielectric resonator 611c side surface of the partition wall (interstage coupling adjustment plate) 623b in the HE11δ mode at 2.82 GHz (harmonics) of the conventional dielectric resonator filter shown in FIG. It is a figure which shows the analysis result of the electric current by the FDTD method, and is the figure seen from the direction of the arrow X shown in FIG. As can be seen from FIG. 5, the current in the vicinity of the central portion in the height direction of the partition wall (interstage coupling adjustment plate) 623c close to the dielectric resonator is relatively large.

On the other hand, in the case of the partition walls (inter-stage coupling adjusting plates) 123a to 123c of this embodiment, the inter-stage coupling adjusting window 124a is located in a region where a relatively large current flows in FIG.
Since ~ 124c is provided and there is no conductor in this region, it is presumed that the generation of HE11δ mode is suppressed and the harmonics of the filter are also suppressed.

FIGS. 6 (a) and 6 (b) are diagrams showing an electric field distribution analysis result and an electric field pattern at 2.14 GHz (pass band) of the dielectric resonator filter of the present embodiment shown in FIG. In the dielectric resonator filter for which the data of FIG. 6A was obtained, the shape of the interstage coupling adjustment window was a rectangle of 25 mm wide × 16 mm long, and the lower side of the interstage coupling adjusting window was 12 mm from the bottom surface of the housing body. The calculation is performed assuming that it is located at. The other factors are the same as those of the analysis model of the above conventional example.

As shown in FIG. 6B, also in this embodiment, the fundamental mode TE01δ mode is excited as in FIG. 3, and the passband of the dielectric resonator filter according to this embodiment is reduced. The characteristics are presumed to be equivalent to those of the conventional example.

FIGS. 7 (a) and 7 (b) are diagrams showing an electric field distribution analysis result and an electric field pattern at 2.82 GHz (harmonics) of the dielectric resonator filter of this embodiment shown in FIG. The dielectric resonator filter for which the data of FIG. 7A was obtained is the same as the data for which the data of FIG. 6 was obtained. As can be seen from the electric field pattern of the dielectric resonator 111a shown in FIG. 7B, the HE11δ mode is unclear and is supposed to be suppressed.

FIGS. 8 (a) to 8 (c) are views showing the frequency characteristics when the shape of the interstage coupling adjustment window of the dielectric resonator filter shown in FIG. 1 is variously changed, together with the window shape. The dielectric resonator filter used to obtain the data shown in the figure is
Diameter 2 composed of dielectric material with relative permittivity 41
A cylindrical ferroelectric resonator having a height of 5 mm and a height of 11 mm;
It has four cubic chambers each having an inside dimension of 40 mm on a side, and the surface is silver-plated on the surface of an aluminum casing, a conductor plate having a diameter of 25 mm, and standard M6 bolts. A resonance frequency adjusting member made of copper, an input / output terminal made of a commercially available SMA connector, and an input / output coupling probe made of a copper wire having a diameter of 1 mm and having a surface plated with silver are provided. At this time, the partition walls 123a to 123
interstage coupling adjustment windows 124a to 124 which are notches of c.
The horizontal center axis of c is fixed at a height of 20 mm from the bottom surface of the housing body, and the quadrangular shape of the inter-stage coupling adjustment windows 123a to 123c at which the inter-stage coupling strength is about the same is 15 mm in width × 27 mm in length. , 20 mm wide × 20 m long and 25 mm wide × 16 mm long.

In any of the characteristics shown in FIGS. 8A to 8C, the harmonic level in the harmonic band of 2.7 GHz to 3 GHz is the same as that of the conventional structure (FIG. 1).
8)).

Further, comparing FIGS. 8A to 8C,
Regarding the ratio of the vertical and horizontal sides of the rectangular shape of the cut portion, the structure shown in FIG. 8C has the lowest harmonic level, and the side parallel to the bottom surface of the housing in the interstage coupling adjustment window is long. It has been confirmed that the higher the effect of suppressing harmonics is.

9 (a) to 9 (c) are partitions 123a to 12 of the interstage coupling adjustment window of the dielectric resonator filter shown in FIG.
It is a figure which shows the frequency characteristic when changing the position of the up-down direction in 3c with a window position. Interstage coupling adjustment window 12
The shapes of 4a to 124c are fixed to a width of 20 mm and a length of 20 mm, and there are three cases in which the lower side of the window is located at 0 mm, 10 mm, and 20 mm from the bottom surface of the housing body. 9A to 9C are compared, the vertical positions of the interstage coupling adjustment windows 124a to 124c are shown in FIG.
The lowest harmonic level can be obtained by providing the interstage coupling adjustment window at the position shown in (b). That is, it can be seen that a higher harmonic suppression effect can be obtained by arranging the interstage coupling adjustment window in the center so that the interstage coupling adjustment window and the dielectric resonator are closer to each other.

As described above, according to the dielectric resonator filter of this embodiment, the partition walls 123a to 123c functioning as interstage coupling adjusting plates are provided with the cut portions to form the interstage coupling adjusting windows 124a to 124c. As a result, the level of harmonics can be suppressed without affecting the characteristics of the pass band.

Particularly, the interstage coupling adjustment windows 124a to 124c.
It was also found that in the shape of, the longer the horizontal side than the vertical side, the higher the effect of suppressing the harmonic level. Further, since the lateral sides of the inter-stage coupling adjusting windows 124a to 124c are long, the movable range of the inter-stage coupling adjusting bolts 131a to 131c can be increased as compared with the conventional dielectric resonator filter. It is possible to secure a larger adjustment range for coupling. In that case, the tips of the inter-stage coupling adjustment bolts 131a to 131c and the inter-stage coupling adjustment windows 124a to
Since the gap between the vertical side of 124c can be widened, the power resistance against large power can be improved.

That is, in the conventional dielectric resonator filter shown in FIG. 17, interstage coupling adjustment bolts 631a-63 are provided.
The movable amount of 31c is small, and the inter-stage coupling adjustment bolt 631a
The adjustment range of interstage coupling by ~ 631c is narrow. Further, depending on the adjustment state of the dielectric resonator filter, the gap between the tip of the interstage coupling adjustment bolt 631a and the partition walls 623a to 623c is narrow, and therefore when a high power signal is input to the dielectric resonator filter, discharge occurs. This may occur and damage the dielectric resonator filter. On the other hand, the dielectric resonator filter of the present embodiment can effectively suppress the occurrence of these problems.

Next, a method of manufacturing the dielectric resonator filter according to this embodiment will be described. FIG. 10 (a),
3B is a front view and a side view of a pair of plate members forming the partition wall 123 prepared in the method for manufacturing the dielectric resonator filter (see FIG. 1) of the present embodiment, respectively. FIG. 11 is a perspective view showing an assembled state of the partition wall 123 of the dielectric resonator filter of this embodiment. FIG. 12 is a front view, a side view, and a bottom view of a side wall portion of the housing body 121 prepared in the method for manufacturing a dielectric resonator filter according to this embodiment.

First, as shown in FIGS. 10A and 10B, two inter-stage coupling adjustment windows 124a, 1 are formed by cutting.
A plate member A on which 24c is formed and a plate member B on which only one interstage coupling adjustment window 124b is formed by cutting are formed. A groove 161 extending from the lower end to the intermediate height position is formed in the central portion of the plate member A, and a groove 162 extending from the upper end to the intermediate height position is formed in the central portion of the plate member A. The width of 161 and 162 is substantially equal to the thickness of each plate member B and A, respectively. Further, the upper and lower ends of the plate member A have flanges 163, 1 for welding and joining.
64 is formed by sheet metal working, and flanges 165, 16 for welding and joining are formed on the upper and lower ends of the plate member B.
6 is formed by sheet metal working.

Then, as shown in FIG. 11, by assembling while engaging the grooves 161 and 162 of the plate members A and B with each other, the partition wall 12 having the interstage coupling adjustment window 124a is formed.
3a and a partition wall 123b having an interstage coupling adjustment window 124b
And a partition wall 123c having an interstage coupling adjustment window 124c,
An inter-stage coupling adjusting component having a partition wall 123d without an inter-stage coupling adjusting window is formed. However, in FIG. 11, the flanges formed at the upper and lower ends of the plate members A and B are not shown.

On the other hand, as shown in FIGS. 11 (a), 11 (b) and 11 (c), a pair of side plates C bent substantially at right angles are prepared. The side plate C has an input terminal 141 or an output terminal 1
A window 171 through which 42 passes and grooves 172 and 173 into which both ends of the plate members A and B are inserted are formed.

Then, sheet metal working including welding (or brazing, bolting, etc.) and bending of a bottom plate (a flat plate (not shown)) of the housing body 121, each partition wall 123a to 123d, and a set of side plates C. By mechanically connecting and fixing with, the housing body 121 and the inter-stage coupling adjustment component shown in FIG. 1 are formed. After that, each dielectric resonator 111
a-111d to partition walls 123a-123d of the housing 120
After arranging one in each of the small rooms partitioned by, the housing main body 121 and the housing lid 122 are bolted to form the dielectric resonator filter shown in FIG.

According to this method, the plate members A and B and the side plates C on which the inter-stage coupling adjusting window and the like are formed by press working (including bending, cutting and punching) are prepared in advance, and these are made into sheet metal. By assembling by processing,
Since the housing body 121 and the inter-stage coupling adjustment component are formed,
There is an advantage that the dielectric resonator filter can be quickly formed.

However, when the filter is composed of only two resonators, only one interstage coupling adjustment window is required, so the interstage coupling adjusting component 123 should be composed of only one plate member. become. In that case, one plate member in which the interstage coupling adjustment window is formed in advance and the housing body 121 are assembled.

(Second Embodiment) FIG. 13 is a perspective view schematically showing the structure of a dielectric resonator filter according to a second embodiment of the present invention. As shown in FIG. 13, the dielectric resonator filter according to the present embodiment has four cylindrical dielectric resonators 21 formed by sintering dielectric powder.
1a to 211d. Each dielectric resonator 211a
The resonance frequency of ˜211d is determined by the height and diameter of the cylindrical shape. In this example, four dielectric resonators 21
1a to 211d operate as a 4-stage bandpass filter. The ferroelectric filter housing 220 includes a housing body 221 composed of a bottom wall and a side wall, a housing lid 222, and
It is configured by partition walls 223a to 223c that partition the space surrounded by the housing body 221 into small rooms and are connected to each other.

In the present embodiment, the housing body 221
Has a rectangular planar shape, and the dielectric resonators 211a to 211a ...
211d is linearly arranged. Further, the inter-stage coupling adjusting windows 224a to 224c, which are notches of the partition walls (inter-stage coupling adjusting plates) 223a to 223c, are formed so as to alternate between the adjacent partition walls. Each of the dielectric resonators 211a to 211d is arranged in each of the four small compartments partitioned by the partition walls 223a to 223c of the housing 220. In addition, in the housing body 221,
An input terminal 241 and an output terminal 242, which are coaxial connectors for inputting and outputting a high-frequency signal from the outside, are provided, and an input coupling probe 251 and an output coupling probe are provided at the center conductors of the input terminal 241 and the output terminal 242, respectively. 252 is connected.

Further, the housing cover 222 is provided for adjusting the resonance frequency of each of the dielectric resonators 211a to 211d.
Resonant frequency adjusting members 261a to 261d in which a circular conductor plate and a bolt connected to the circular conductor plate are integrated are attached. The resonance frequency adjusting members 261a to 261d
Of the dielectric resonators 211a to 21a.
The resonance frequency adjusting member 261a is arranged so as to be in the same plane position as the central axis of 1d (that is, concentric position).
Structures and functions of ˜261d are similar to those of the first embodiment.

As with the first embodiment, the dielectric resonator filter of the present embodiment also has a low level of unnecessary harmonics appearing on the high frequency side of the pass band and a large adjustment range of interstage coupling. Moreover, it is possible to realize a dielectric resonator filter that operates as a bandpass filter with high power resistance.

(Third Embodiment) FIG. 14 is a perspective view schematically showing the structure of a dielectric resonator filter according to a third embodiment of the present invention. As shown in FIG. 14, the dielectric resonator filter according to the present embodiment has four cylindrical dielectric resonators 31 formed by sintering dielectric powder.
1a to 311d. Each dielectric resonator 311a
The resonance frequency of 311d is determined by the height and diameter of the cylindrical shape. In this example, four dielectric resonators 31
1a to 311d operate as a four-stage bandpass filter. The housing 320 of the ferroelectric filter includes a housing body 321 composed of a bottom wall and a side wall, a housing lid 322,
It is configured by partition walls 323a to 323d that partition the space surrounded by the housing body 321 into small chambers and are connected to each other.

In the present embodiment, the interstage coupling adjustment window 3
24a to 324c are not formed by directly cutting the partition walls 323a to 323c, but the partition walls 323a to 323c.
It is formed by two upper and lower beams supported by 23c. However, since the upper and lower beams also function as a part of the partition wall (interstage coupling adjustment plate), the interstage coupling adjusting windows 324a to 324c of the present embodiment also have the same configuration as in the first and second embodiments. It can be regarded as a notch formed in the partition wall.

Then, each of the dielectric resonators 311a to 311
One d is provided in each of the four small chambers partitioned by the partition walls 323a to 323d of the housing 320. Further, the housing main body 321 is provided with an input terminal 341 and an output terminal 342 which are coaxial connectors for inputting and outputting a high frequency signal from the outside. The center conductors of the input terminal 341 and the output terminal 342 are An input coupling probe 351 and an output coupling probe 352 are connected to each other.

Further, the housing lid 322 is provided to adjust the resonance frequency of each of the dielectric resonators 311a to 311d.
Resonant frequency adjusting members 361a to 361d in which a circular conductor plate and a bolt connected to the circular conductor plate are integrated are attached. The resonance frequency adjusting members 361a to 361d
Of which the central axes are respectively dielectric resonators 311a to 311.
The resonance frequency adjusting member 361a is arranged so as to be in the same plane position as the central axis of 1d (that is, concentric position).
Structures and functions of ˜361d are similar to those of the first embodiment.

Next, a method of manufacturing the dielectric resonator filter of this embodiment will be described. 15 (a), (b)
FIG. 4A is a perspective view schematically showing a manufacturing process of the dielectric resonator filter of the present embodiment. In FIGS. 15A and 15B, the illustration of the housing main body 321 is omitted for clarity, and only a part thereof is shown by a broken line.

First, as shown in FIG. 15A, the partition wall 3
Main part 3 of interstage coupling adjustment part having 23a to 323d
23x is formed. At this time, the partition walls 323a to 323d may be formed by assembling a pair of plate members, or the main part 323x of the interstage coupling adjustment component having the partition walls 323a to 323d may be formed by cutting. Then, the housing body 321 and the main part 323x of the interstage coupling adjustment component shown by the broken line in the drawing are assembled. Alternatively, the main part 323x and the housing body 321 may be integrally formed in the interstage coupling adjustment component at the same time.

Next, as shown in FIG. 15B, in the main parts 323x of the inter-stage coupling adjusting component, the partition walls 323a to 323c having the inter-stage coupling adjusting function are attached to the upper beam 351 and the lower side which are conductor plates. The beam 352 is joined. Partition 323d
Has its entire side surface in direct contact with the side plate of the housing body 321. At this time, for example, the upper beam 351 and the lower beam 3
52 is formed from a thin copper plate, and the beams 351 and 352 are joined to the partition walls 323a to 323c by, for example, lead solder.

According to the method of manufacturing the dielectric resonator filter of the present embodiment, the upper beam 351 and the lower beam 352 can be easily replaced with those having different sizes, and the shape can be easily changed by a cutting tool such as a luteer. It can be changed. Therefore, in the configuration shown in FIG. 1, even when the adjustment range of the interstage coupling by the interstage coupling adjustment bolts 151a to 151c is exceeded, the area of the interstage coupling adjustment windows 324a to 324c can be easily made by the present embodiment. Can be changed. It is not necessary to provide both the upper beam 351 and the lower beam 352, and only one of them may be provided.

That is, according to the method of manufacturing the dielectric resonator filter of this embodiment, after forming the main body 321 and the main portion 323x of the interstage coupling adjustment component, the upper beam and the lower beam (or the upper beam). Or only one of the lower beams) is attached to the partition wall by lead solder or the like to form the interstage coupling adjustment windows 324a to 324c. Therefore, in addition to the effect of the first embodiment, the interstage coupling adjusting bolt 331a is formed. ~ 3
The adjustment range of interstage coupling by 31c can be expanded.

However, when the filter is composed of only two resonators, only one interstage coupling adjustment window is required, so the interstage coupling adjusting component 123 should be composed of only one plate member. become. In that case, after assembling the main part of the inter-stage coupling adjustment component composed of one plate member and the housing body, the upper beam or the lower beam or both of them are attached to the main part of the inter-stage coupling adjustment component. become.

(Fourth Embodiment) FIG. 16 is a perspective view schematically showing the structure of a dielectric resonator filter according to a fourth embodiment of the present invention. As shown in FIG. 16, the dielectric resonator filter of this embodiment has four cylindrical dielectric resonators 41 formed by sintering dielectric powder.
1a to 411d. Each dielectric resonator 411a
The resonance frequencies of ˜411d are determined by the height and diameter of the cylindrical shape. In this example, four dielectric resonators 41
1a to 411d operate as a four-stage band pass filter. The housing 420 of the ferroelectric filter includes a housing body 421 composed of a bottom wall and a side wall, a housing lid 422,
It is constituted by partition walls 423a to 423d that partition the space surrounded by the housing body 421 into small chambers and are connected to each other.

In this embodiment, the partition walls 423a to 423a-4
Of the 23d, the three partition walls 423a to 423c that function as interstage coupling adjustment plates do not contact the inner side surface of the housing body 421, and a gap is provided between them. The electromagnetic field coupling between the dielectric resonators 411a to 411d is mainly performed through this gap. In addition, the partition wall 423a to
423c includes interstage coupling adjustment bolts 431a to 431c.
Is provided with a notch for expanding the movable range of the. Due to the gap between the partition walls 423a to 423c and the inner surface of the housing body 421 and the cut portion, the interstage coupling adjustment window 424 is formed.
a to 424c are configured. However, in the present embodiment as well, the adjustment function of the inter-stage coupling is substantially enhanced by the cut portions only by removing both sides of the cut portions of the partition walls 423a to 423c.

Then, each of the dielectric resonators 411a-411.
One d is provided in each of the four small chambers partitioned by the partition walls 423a to 423c of the housing 420. Further, the housing body 421 is provided with an input terminal 441 and an output terminal 442 by a coaxial connector for inputting and outputting a high frequency signal from the outside, and the center conductors of the input terminal 441 and the output terminal 442 are An input coupling probe 451 and an output coupling probe 452 are connected to each other.

Further, the housing lid 422 is provided for adjusting the resonance frequency of each of the dielectric resonators 411a to 411d.
Resonant frequency adjusting members 461a to 461d in which a circular conductor plate and a bolt connected to the circular conductor plate are integrated are attached. The resonance frequency adjusting members 461a to 461d
Of the dielectric resonators 411 a to 41
The resonance frequency adjusting member 461a is disposed so as to be in the same plane position as the central axis of 1d (that is, concentric position).
Structures and functions of to 461d are similar to those of the first embodiment.

According to the dielectric resonator filter of the present embodiment, since the movable range of the interstage coupling adjustment bolts 431a to 431c is large, in addition to the same effect as the first embodiment, the interstage coupling adjustment range is also provided. It is possible to obtain an effect that the value can be increased.

(Other Embodiments) In the first to fourth embodiments, as a dielectric resonator filter to which the present invention is applied, a multistage filter using four stages of dielectric resonators is taken as an example. However, the structure of the dielectric resonator filter of the present invention is not limited to the above-mentioned respective embodiments, and 6-stage, 8-stage
The effect of the present invention can be exerted also on a dielectric resonator filter having a number of stages other than four such as stages.

In the first to fourth embodiments,
As the dielectric resonator filter to which the present invention is applied, a band pass filter is taken as an example, but the structure of the dielectric resonator filter of the present invention is not limited to the above embodiments, and other, for example, band The effect of the present invention can be exerted also for the blocking filter. In that case, it can be easily understood that the effect of the present invention is exhibited by replacing the pass band in the present invention with the stop band.

Further, in the first to fourth embodiments,
Although the shape of the inter-stage coupling adjusting window, which is the cutout portion of the partition wall functioning as the inter-stage coupling adjusting plate, is the same for each partition wall, the shape of the inter-stage coupling adjusting window of the present invention is the same as those in these embodiments. The configuration is not limited, and it is possible to adopt a configuration in which each partition wall has a different shape.

Further, in the first to fourth embodiments, the notch portion of the partition wall functioning as the interstage coupling adjustment plate is provided on the outer side surface of the partition wall, but the shape of the interstage coupling adjustment window of the present invention is the same. The present invention is not limited to the embodiment, and as shown by the broken line in FIG. 1, a cut portion may be formed on the inner side surface of the partition wall, and this may be used as the interstage coupling adjustment window.

Further, the size and position of the notch (interstage coupling adjustment window) in each embodiment are not limited to the dimensions and positions illustrated in each embodiment, but may depend on the required interstage coupling strength. The determined and required inter-stage coupling strength can be appropriately selected according to the specifications of the dielectric resonator filter, the design of the dielectric resonator, the setting of the movable range of the inter-stage coupling adjustment bolt, and the like.

[0071]

According to the method of manufacturing the dielectric resonator filter of the present invention, the interstage coupling adjusting plate between the dielectric resonators is provided with the cut portion to suppress the disturbance of the characteristics in the pass band. Therefore, it is possible to provide a dielectric resonator filter having a low loss and a steep pass band and excellent characteristics.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing the structure of a dielectric resonator filter according to a first embodiment of the present invention.

FIG. 2 is a diagram showing frequency characteristics of the dielectric resonator filter according to the first embodiment of the present invention.

3 is an FDT of the electric field distribution at 2.14 GHz (pass band) of the conventional dielectric resonator filter shown in FIG.
It is a figure which shows the analysis result by D method.

4 is an FDTD of the electric field distribution at 2.82 GHz (harmonics) of the conventional dielectric resonator filter shown in FIG.
It is a figure which shows the analysis result by the method.

5 is a diagram showing an FDTD analysis result of a current flowing through the surface of the conventional dielectric resonator filter shown in FIG. 17 at 2.82 GHz in the HE11δ mode on the dielectric resonator side of the interstage coupling adjusting plate. .

6 (a) and 6 (b) are diagrams respectively showing, in order, an analysis result of an electric field distribution at 2.14 GHz and an electric field pattern of the dielectric resonator filter shown in FIG.

7A and 7B are diagrams respectively showing an electric field distribution analysis result and an electric field pattern at 2.82 GHz of the dielectric resonator filter shown in FIG.

8A to 8C are diagrams showing the frequency characteristics when the shape of the interstage coupling adjustment window of the dielectric resonator filter shown in FIG. 1 is changed, together with the window shape.

9 (a) to 9 (c) are diagrams showing frequency characteristics together with window positions when various positions in the vertical direction in the partition wall of the interstage coupling adjustment window of the dielectric resonator filter shown in FIG. 1 are changed. is there.

10A and 10B are a front view and a side view, respectively, in order of a pair of plate members forming a partition wall prepared in the method for manufacturing a dielectric resonator filter according to the first embodiment. is there.

FIG. 11 is a perspective view showing an assembled state of partition walls of the dielectric resonator filter according to the first embodiment.

FIG. 12 is a front view of a side wall portion of a housing body prepared in the method for manufacturing a dielectric resonator filter according to the first embodiment,
It is a side view and a bottom view.

FIG. 13 is a perspective view schematically showing the structure of a dielectric resonator filter according to a second embodiment of the present invention.

FIG. 14 is a perspective view schematically showing the structure of a dielectric resonator filter according to a third embodiment of the present invention.

15A and 15B are perspective views schematically showing a manufacturing process of the dielectric resonator filter of the third embodiment.

FIG. 16 is a perspective view schematically showing the structure of a dielectric resonator filter according to a fourth embodiment of the present invention.

FIG. 17 is a perspective view schematically showing an example of a conventional four-stage dielectric resonator filter.

FIG. 18 is a diagram showing an example of frequency characteristics of a conventional four-stage dielectric resonator filter.

[Explanation of symbols]

111 Dielectric resonator 120 housing 121 body 122 housing lid 123 Partition wall (interstage coupling adjustment member) 124 Interstage coupling adjustment window 131 Interstage coupling adjustment bolt 141 input terminal 142 output terminals 151 Input coupling probe 152 Output coupling probe 161 Resonance frequency adjusting member

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[Procedure amendment]

[Submission date] January 29, 2002 (2002.1.2
9)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Delete

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

[0029] In contrast, though if the partition walls of the present embodiment (stage coupling adjustment plate) 123 a to 123 c, relatively interstage coupling adjusting window 124a~124c the large currents region is provided, this Since there are no conductors in the area,
It is presumed that the generation of HE11δ mode is suppressed and the harmonics of the filter are also suppressed.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

On the other hand, as shown in FIG. 12, a pair of side plates C bent substantially at right angles are prepared. On this side plate C,
A window 171 through which the input terminal 141 or the output terminal 142 penetrates
And grooves 172, 17 into which both ends of the plate members A, B are inserted.
3 is formed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0060

[Correction method] Change

[Correction content]

However, when the filter is composed of only two resonators, only one interstage coupling adjusting window is required, so the interstage coupling adjusting component 323 should be composed of only one plate member. become. In that case, after assembling the main part of the inter-stage coupling adjustment component composed of one plate member and the housing body, the upper beam or the lower beam or both of them are attached to the main part of the inter-stage coupling adjustment component. become.

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

[Procedure correction 6]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

Continued front page    (72) Inventor Kunihiko Minami             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Toshiaki Nakamura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Akira Enohara             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Michio Okajima             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 5J006 HC03 HC21 JA01 JA34 LA03                       LA08 MA01 MB01 NA01 NB06                       NE01 NE11

Claims (7)

[Claims] 1. A plurality of dielectric resonators including an input-stage dielectric resonator that receives a high-frequency signal from an external device, and an output-stage dielectric resonator that outputs a high-frequency signal to an external device, and a plurality of the above-described plurality of dielectric resonators. A housing that surrounds the dielectric resonator and functions as an electromagnetic field shield; input coupling means that couples the input high-frequency signal and the electromagnetic field of the dielectric resonator at the input stage to each other; Output coupling means for coupling the electromagnetic fields of the signal and the dielectric resonator of the output stage to each other,
Of the plurality of dielectric resonators, the dielectric resonator filter is provided between the dielectric resonators in which electromagnetic fields are coupled to each other, and an interstage coupling adjustment component for adjusting the electromagnetic field coupling strength is provided. A method of manufacturing, comprising a step (a) of forming at least one plate member having a cut portion in at least one region; and, after the step (a), the at least one plate member and the housing body are A method of manufacturing a dielectric resonator filter, comprising the step (b) of forming the interstage coupling adjustment component and the housing body by assembling. 2. A plurality of dielectric resonators including an input-stage dielectric resonator that receives a high-frequency signal from an external device and an output-stage dielectric resonator that outputs a high-frequency signal to the external device; A housing that surrounds the dielectric resonator and functions as an electromagnetic field shield; input coupling means that couples the input high-frequency signal and the electromagnetic field of the dielectric resonator at the input stage to each other; Output coupling means for coupling the electromagnetic fields of the signal and the dielectric resonator of the output stage to each other,
Of the plurality of dielectric resonators, the dielectric resonator filter is provided between the dielectric resonators in which electromagnetic fields are coupled to each other, and an interstage coupling adjustment component for adjusting the electromagnetic field coupling strength is provided. A manufacturing method, the step (a) of assembling the main part of the interstage coupling adjustment component and the housing body, and the step adjustment function of the main part of the interstage coupling adjustment component after the step (a). By attaching at least one of the upper beam and the lower beam to the outer surface of the region having
A method of manufacturing a dielectric resonator filter, including the step (b) of forming an interstage adjustment plate having a cut portion. 3. The method for manufacturing a dielectric resonator filter according to claim 1, wherein the cut portion of the interstage coupling adjustment component is substantially quadrangular in shape. Production method. 4. The method for manufacturing a dielectric resonator filter according to claim 1, wherein the cut portion of the interstage coupling adjustment component is arranged such that its long side is substantially parallel to the bottom surface of the housing. Method for producing a dielectric resonator filter, wherein the dielectric resonator filter has a substantially rectangular shape. 5. The method for manufacturing a dielectric resonator filter according to claim 1, wherein the notch of the interstage coupling adjustment component is located at a position in the height direction of the housing of the dielectric resonator. A method of manufacturing a dielectric resonator filter, characterized in that the dielectric resonator filter is arranged so as to substantially coincide with the position where it is provided. 6. The method for manufacturing a dielectric resonator filter according to claim 1, wherein the notch of the interstage coupling adjustment component is a wall of an outer peripheral portion of the housing. A method for manufacturing a dielectric resonator filter, wherein the dielectric resonator filter is formed so as to be in contact with the inner side surface. 7. The method of manufacturing a dielectric resonator filter according to claim 1, wherein each of the plurality of dielectric resonators is a TE01δ mode resonator. Method for manufacturing a dielectric resonator filter.