JP3085139B2 - Dielectric filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric filter used for mobile communication equipment and the like, and more particularly to a band elimination filter (BEF) type dielectric filter having a band pass filter (BPF).

[0002]

2. Description of the Related Art FIG. 17 shows a conventional general two-stage B
FIG. 2 is a developed perspective view of an EF type dielectric filter. FIG.
8 shows an equivalent circuit of the BEF type dielectric filter, and FIG. 19 shows a frequency attenuation characteristic diagram.

In the equivalent circuit shown in FIG. 18, R is a dielectric resonator, Ce is a trap capacitance, Ct is a parallel capacitance, and L is
Is an inductor as an electrical angle π / 2 phase shifter. FIG.
The BEF type dielectric filter shown in FIG.
Above the dielectric resonators R, R, and the trap capacitors Ce, Ce
Are mounted, the dielectric resonators R, R and the trap capacitors Ce, Ce are connected by the connection terminals 92, 92, and the case cover 91 is attached.

A block circuit diagram of a mobile communication device such as a portable telephone using the BEF type dielectric filter has a configuration shown in FIG. 20, and the BEF type dielectric filter transmits (TX) in a duplexer DPX. Used for side circuit. Further, the frequency f _TX of TX in this mobile communication device
19 and the frequency f _RX on the reception (RX) side are shown in FIG. RX
The frequency f _RX is matched with the trap frequency f _T of the BEF type dielectric filter.

[0005]

In the mobile communication device as shown in FIG. 20, f _TX- which enters the TX side circuit in the duplexer DPX from the antenna ANT.
The signal of the frequency fs (see FIG. 19) of (f _RX −f _TX ) is
Conventional BEF-type dielectric filters having the frequency attenuation characteristics shown in FIG. Therefore, it is necessary to insert the isolator ISO into the TX side circuit.

Further, in order to attenuate an unnecessary frequency signal generated in the mixer MX on the TX side, it has been necessary to insert a band-pass filter BPF into the circuit on the TX side.

Here, if a BPF type dielectric filter is used in place of the BEF type dielectric filter in the TX side circuit in the duplexer DPX, the above problem does not occur, but the same insertion loss characteristic as that of the BEF type dielectric filter. And a new problem that the attenuation characteristics cannot be sufficiently obtained with the same size.

Further, in order to form the BEF type dielectric filter having the above-described conventional configuration, in addition to the dielectric resonator, the connection terminal 92, the inductor pattern substrate 93,
There is a problem that components such as the base substrate 94 are required, the number of components is large, the cost is high, and the shape is large.

The present invention has been made in order to solve such a problem, and has a small number of components, can obtain a large amount of attenuation outside a necessary pass band, and therefore has both a low-cost and small BPF. An object of the present invention is to provide a BEF type dielectric filter.

[0010]

The means for solving the problems of the present invention are as follows.

The invention according to claim 1 is characterized in that the first and second
The end face and the four sides connecting between the first and second end faces
And a dielectric block having a surface.
At least a portion formed between the first and second end faces of the
Is also a dielectric filter having four resonance lines,
Adjacent pair of resonance lines reverse open and short ends
This pair of resonant lines are interdigitated
One-stage band elimination filter
And at least two of these at least two
Interstage one-stage band elimination filter
Π / 2 phase shift coupling in electrical angle
It is characterized by being made.

[0012] The invention according to claim 2 is the invention according to claim 1.
In the dielectric filter, the one-stage band eliminator
The open end of one of the resonance lines of the
Dielectric body provided in the resonant line hole where the path is formed
And the open end of another resonant line is
Characterized by being formed on the end face of the electric block
You.

[0013] The invention according to claim 3 is based on the short side and the long side.
Rectangular first and second end faces, and the first and second
Dielectric block having four side surfaces connecting between the end surfaces thereof.
Between the lock and the first and second end faces of the dielectric block.
A dielectric member having a plurality of resonant lines formed therethrough;
A filter, wherein the plurality of resonance lines are formed by the dielectric block.
Two rows in the short side direction at the first and second end faces of the lock
Formed in multiple rows in the long side direction.
The resonance lines arranged in two rows in the side direction are first resonance lines, respectively.
A first group of resonance lines comprising a road group and a second group of resonance lines;
Each has a short-circuit end formed on the first end face of the dielectric block
And the open end is the second end face of the dielectric block.
And the second resonance line group has a short-circuited end.
Formed on the second end face of the dielectric block and opened.
A release end is formed on the first end surface of the dielectric block, and
A pair of adjacent resonance lines formed in the same row
-Digitally coupled to one-stage band elimination
And a plurality of one-stage band filters.
Combination of the limiting filter in electrical angle π /
It is characterized by two phase-shift couplings.

According to a fourth aspect of the present invention, the short side and the long side
Rectangular first and second end faces, and the first and second
Dielectric block having four side surfaces connecting between the end surfaces thereof.
Between the lock and the first and second end faces of the dielectric block.
A dielectric member having a plurality of resonant lines formed therethrough;
A filter, wherein the plurality of resonance lines are formed by the dielectric block.
Two rows in the short side direction at the first and second end faces of the lock
Formed in multiple rows in the long side direction.
The resonance lines arranged in two rows in the side direction are first resonance lines, respectively.
A first group of resonance lines comprising a road group and a second group of resonance lines;
Each resonance line of the second resonance line group and each resonance line of the second resonance line group
The open and short ends are alternately formed on the opposite end surfaces, respectively.
First resonance line group formed in the same row in the long side direction
And the resonance lines of the second resonance line group are open.
The discharge end and short-circuit end are formed on opposite end faces,
A pair of adjacent resonance lines formed in the same row in the
One-stage band elimination
A plurality of one-stage bands
Eliminates elimination interdigitally by electrical angle π
/ 2 phase shift coupling.

The invention according to claim 5 is the invention according to claim 3 or claim
Item 5. The dielectric filter according to item 4, wherein the first resonance
A shield electrode is provided between adjacent resonance lines in the line group.
It is characterized by being.

According to a sixth aspect of the present invention, the short side and the long side
Rectangular first and second end faces, and the first and second
Dielectric block having four side surfaces connecting between the end surfaces thereof.
Between the lock and the first and second end faces of the dielectric block.
A dielectric member having a plurality of resonant lines formed therethrough;
A filter, wherein the plurality of resonance lines are formed by the dielectric block.
Two rows in the short side direction at the first and second end faces of the lock
, And formed in three or more rows in the long side direction,
The resonance lines arranged in two rows in the short side direction are the first resonance lines, respectively.
A line group and a second resonance line group, and are arranged in the same direction in the long side direction.
A pair of adjacent resonance lines formed at
And the short-circuit end are formed in the opposite direction.
And one-stage band elimination
A plurality of one-stage band eliminators.
Filter is interdigital or comb line
Π / 2 phase shift coupling in electrical angle, and the first resonance line
The open end of each resonance line of the group is the resonance at which the resonance line is formed.
Formed by a dielectric substrate provided in the line hole,
The open ends of the resonance lines at both ends of the two resonance line groups are
Formed on either end of the
The remaining of the second resonance line group is connected to the formed connection electrode.
The open end of the resonance line is the resonance line on which the resonance line is formed.
It is formed by a dielectric substrate provided in the road hole
It is characterized by the following.

[0017] The invention according to claim 7 is the invention according to claim 1
Item 7. The dielectric filter according to any one of Items 6,
The cross-sectional shape of the resonance line hole where the resonance line is formed is flattened
It is characterized by having been done.

[0018]

[0019]

[0020]

[0021]

According to the above arrangement, one interdigital pair-coupled two-resonance line BEF is connected to a single dielectric block.
Since a plurality of stages are formed to form a multi-stage BEF type dielectric filter, a small BEF type having a BPF function of attenuating the frequency band on the low frequency side and the high frequency side of the trap frequency is provided. A dielectric filter can be obtained. In other words, the number of components is reduced, the size can be reduced, and a large amount of attenuation can be obtained outside the necessary passband, so that the circuit configuration of the mobile communication device can be simplified.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a two-stage BEF type dielectric filter. Reference numeral 10 denotes a rectangular dielectric block. The dielectric block 10 has four cylindrical through resonance line holes 1a, 2a, 3a, and 4a close to each other from one end face to the other end face. Have been.

An inner conductor is provided on the inner surface of each of the resonance line holes 1a to 4a. The inner conductor of the resonance line hole 2a is connected to the electrode 2b at one end face of the dielectric block 10. The inner conductor of the resonance line hole 3a is connected to the electrode 3b on the other end surface of the dielectric block 10. An outer conductor is mainly formed on the outer surface of the dielectric block 10 except for the dielectric bases 2c and 3c outside the electrodes 2b and 3b. These dielectric substrates 2c and 3c form open ends of the resonance line.

In the resonance line hole 1a, a ring-shaped dielectric substrate 1c is provided near or adjacent to the other end face of the dielectric block 10. Further, a ring-shaped dielectric base 4c is also provided in the vicinity of one end face of the dielectric book 10 or in a portion adjacent to the end face in the resonance line hole 4a. These dielectric bases 1c and 4c divide the respective inner conductors and form the open ends of the resonance lines. The inner conductor of the resonance line holes 1a, 3a, 4a is connected to the outer conductor at one end face of the dielectric block 10. Also, the resonance line holes 1a, 2a, 4
The inner conductor a is connected to the outer conductor at the other end face of the dielectric block 10. These resonance line holes 1a to 4a are provided with interdigital resonance lines 1 to 4 respectively.
Respectively. The electrodes 2b and 3b of the resonance lines 2 and 3 serve as input / output terminals.

As shown in the equivalent circuit of FIG. 2, the resonance lines 1 and 2 shown in FIG. 1 are pair-coupled interdigitally to form a one-stage band elimination filter (BEF) 1.
1. Similarly, the resonance lines 3 and 4 are pair-coupled in an interdigital manner to form a one-stage band elimination filter (BEF) 12. And
These BEFs 11 and 12 are coupled by a phase shifter having an electrical angle of π / 2 formed between the resonance lines 2 and 3 to form a BEF type dielectric filter having a total of two stages. This first
The BEF type dielectric filter of the embodiment also has the function of a band pass filter (BPF), and attenuation can be obtained on the low frequency side and the high frequency side of the trap frequency.

FIG. 3 shows an equivalent circuit of the dielectric filter according to the first embodiment, and FIG. 4 shows a frequency attenuation characteristic diagram.

In the equivalent circuit of FIG. 3, Ze is the characteristic impedance of the even mode, Zk is the coupling characteristic impedance, and θ is the phase shift angle of π / 2. In FIG. 3, 1
The BEF of a stage is represented by a parallel branch in which Zk, θ and Ze, θ are connected in series, and a parallel branch of Ze, θ. In the dielectric filter according to the first embodiment, this one-stage BEF is divided into two stages, Z
They are connected via transmission lines of k and θ.

In the frequency attenuation characteristic diagram of FIG. 4, the solid line is the case of the present embodiment, and the broken line is the B of the conventional example shown in FIG.
It is a frequency attenuation characteristic of an EF type dielectric filter. As shown in FIG. 4, the present embodiment has almost the same attenuation at the trap frequency f _{T as} compared with the conventional example, but has a larger attenuation in the frequency band on the low frequency side and on the high frequency side (indicated by the arrow) of the trap frequency. You can see that.

In the conventional example shown in FIG. 17, as shown in FIG. 18, an out-of-band attenuation is obtained by using a .pi. / 2 phase shifter and a low-pass filter in an LC .pi.-type circuit. The low-pass attenuation cannot be obtained with the LC low-pass filter.
Also, no attenuation as in this embodiment is obtained on the high frequency side.

The BE of this embodiment having such an attenuation characteristic
When the F-type dielectric filter is used in the TX side circuit in the duplexer DPX of the mobile communication device shown in FIG. 20, the required attenuation can be obtained on the low frequency side of the trap frequency. Duplexer DPX
It is possible to eliminate the need for an isolator ISO for blocking a signal (a signal having a frequency fs or the like) entering the TX side circuit therein. In addition, since attenuation can be obtained on the low frequency side and the high frequency side of the trap frequency, a bandpass filter BPF for attenuating a signal of an unnecessary frequency generated in the mixer MX on the TX side is unnecessary or necessary. Even if there is, it can be replaced with a small and low-cost BPF with a small number of stages.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 5 shows a five-stage comb-line coupled BEF type dielectric filter. Reference numeral 20 denotes a rectangular dielectric block. The dielectric block 20 has a cylindrical resonant line formed of two rows and five columns in a geometrical proximity from one end face to the other end face. 21a-2
The through-resonance line holes 5a are provided in the upper stage, and the resonance lines 21b to 25b
A total of ten through resonance line holes b are provided at the lower stage.

On one end face of the dielectric block 20, the upper resonance lines 21a to 25a constitute a short-circuit end, the lower resonance lines 21b to 25b constitute an open end, and the other end face has an upper resonance line. Tracks 21a-25
a constitutes an open end, and the lower resonance lines 21b to 25b constitute short-circuit ends. The outer surface of the dielectric block 20 excluding these open end surfaces is mainly covered with an outer conductor. In addition, inner conductors are provided in the through resonance line holes of the resonance lines 21a to 25a and the through resonance line holes of the resonance lines 21b to 25b.

The upper and lower resonance lines 21a and 21b, 22a and 22b, 23a and 23b, 24a and 24b, 25a and 2
5b is a one-stage band elimination filter (BEF) 2 which is pair-connected in an interdigital manner.
1, 22, 23, 24 and 25 are respectively constituted. These BEFs 21, 22, 23, 24, and 25 perform comb line coupling between adjacent filters. The specific structure for comb line coupling is a conventionally known structure. Input and output of this dielectric filter are performed using the resonance lines 21b and 25b. This equivalent circuit is shown in FIG. FIG. 6 shows Ze,
A single-stage BEF including a parallel branch in which θ and Zk, θ are connected in series and a parallel branch of Ze, θ is connected via a transmission line of Zk, θ.

FIG. 7 shows a third embodiment of a 5-stage interdigitally coupled BEF type dielectric filter. Numeral 30 denotes a rectangular dielectric block. The dielectric block 30 has two resonance lines 31a to 35a geometrically arranged in two rows and five columns in close proximity from one end face to the other end face. In the upper stage, and the through resonance line holes in the resonance lines 31b to 35b in the lower stage.
There are zero. These resonance lines 31a to 35
a, an inner conductor is provided in each of the through resonance line holes 31b to 35b.

The resonance lines 31a, 32b, 33a, 34
b and 35a constitute a short-circuit end on one end face of the dielectric block 30 and constitute an open end on the other end face. Also, the resonance lines 31b, 32a, 33b, 34a,
35b constitutes an open end on one end face of the dielectric block 30 and constitutes a short-circuit end on the other end face.
The outer surface of the dielectric block 30 is mainly covered with an outer conductor except for the open end.

The upper and lower resonance lines 31a and 31b, 32a and 32b, 33a and 33b, 34a and 34b, 35a and 3
5b is a one-stage band elimination filter (BEF) 3 which is pair-coupled interdigitally.
1, 32, 33, 34, and 35 respectively. These BEFs 31, 32, 33, 34, 35 are interdigitally coupled by proximity filters. The equivalent circuit is shown in FIG. Since the equivalent circuit of FIG. 8 is the same as that described in FIG. 3, the description is omitted. The input / output of this dielectric filter is
b and 35b.

FIG. 9 shows a fourth embodiment of a comb-line-coupled BEF type dielectric filter having a five-stage structure. In the second embodiment shown in FIG.
A shielding electrode 41 that conducts with an outer conductor is provided between 2a, 23a, 24a, and 25a to eliminate coupling between adjacent upper resonance lines. The other parts are the same as in the second embodiment shown in FIG.

FIG. 10 shows a fifth embodiment of an interdigitally coupled BEF type dielectric filter having a three-stage configuration. Numeral 50 denotes a rectangular dielectric block. The dielectric block 50 has a cylindrical resonance line formed of two rows and three columns in close proximity from one end face to the other end face. A total of six through resonance line holes 51a to 53a are provided in an upper stage, and a total of six through resonance line holes are present in a lower stage in the resonance lines 51b to 53b. These resonance lines 51a-53a, 51b-53b
Are provided with inner conductors.

The inner conductor of the resonance lines 51b, 52a, 53b is connected to the electrode 5 on one end face of the dielectric block 50.
1c, 52c, and 53c, and the other end face is connected to an outer conductor. Also, the resonance line 5
The inner conductors 1a, 52b and 53a are
Are connected to the electrodes 51d, 52d, and 53d, respectively, and connected to an outer conductor at one end. The dielectric block 50 includes electrodes 51c and 52
Except for the dielectric substrate 50a outside of c, 53c, 51d, 52d, and 53d, it is mainly covered with an outer conductor.

A shielding electrode 54 is provided between the upper resonance lines 51a and 52a and between the resonance lines 52a and 53a.
It shields coupling between adjacent lines. The upper and lower resonance lines 51a and 51b, 52a and 52b, 53a and 5
3b are paired in an interdigital manner to form one-stage band elimination filters (BEF) 51, 52,
53 are constituted respectively. And these BEF
51, 52 and 53 are lower resonance lines 51b and 52b,
The interdigital-coupled BEF type dielectric filter of the present embodiment is formed by interdigitating π / 2 phase shifts in electrical angles between 52b and 53b. FIG. 11 is a circuit configuration diagram, and FIG. 12 is an equivalent circuit diagram.

FIG. 13 shows a sixth embodiment of a three-stage interdigitally coupled BEF type dielectric filter.
A one-stage BEF 61 is provided on the convex dielectric block 60 by resonance lines 61a and 61b of left and right interdigital pair coupling, resonance lines 62a and 62b of upper and lower interdigital pair coupling, and resonance lines 63a and 63b of left and right interdigital pair coupling. 62 and 63 are configured. The inner conductors of the resonance lines 61b, 62a, 63a are connected to the electrodes 61c, 6 on one end face of the dielectric block 60.
2c and 63c, respectively, and the other end face is connected to the outer conductor.

The inner conductors of the resonance lines 61a, 62b, 63b are connected to the other end face of the dielectric block 60 by
The electrodes are connected to the electrodes 61d, 62d, and 63d, respectively, and are connected to the outer conductor at one end surface. The dielectric block 60 includes electrodes 61c, 62c, 63c, 61d, 6
Except for the dielectric substrate 60a outside of 2d and 63d, it is mainly covered with an outer conductor. 1-stage BEF61, 62,
Reference numeral 63 denotes an interdigitally coupled BEF type dielectric filter according to the present embodiment, which is π / 2 phase-shifted by an electrical angle in an interdigital manner, similarly to the above-described embodiment. The circuit configuration diagram and the equivalent circuit diagram of the present embodiment almost correspond to FIGS. 11 and 12 of the embodiment.

FIG. 14 shows a seventh embodiment of a three-stage interdigitally coupled BEF type dielectric filter. Numeral 70 denotes a rectangular dielectric block. The dielectric block 70 has a cylindrical resonant line formed of two rows and three columns in close proximity from one end face to the other end face. A total of six through resonance line holes 71a to 73a are provided in the upper stage, and a total of six through resonance line holes in the resonance lines 71b to 73b are provided in the lower stage. These resonance lines 71
Inner conductors are provided in the through resonance line holes a to 73a and 71b to 73b.

The inner conductors of the resonance lines 71b and 73b are connected to the electrodes 71c and 7c on one end face of the dielectric block 70.
3c. These resonance lines 71
b, 73b, except for one end face.
Both ends of the inner conductor 3a, 71b to 73b are connected to the outer conductor. The dielectric block 70 includes electrodes 71c and 73
With the exception of the dielectric substrate 70a outside c, it is mainly covered with an outer conductor.

In the resonance lines 71a, 72b and 73a, the ring-shaped dielectric bases 71d and 72 are provided near the other end face of the dielectric block 70 or at a portion adjacent to the end face.
d and 73d are provided. Also, a ring-shaped dielectric base 72c is provided in the vicinity of or adjacent to one end face of the dielectric block 70 in the resonance line 72a. These dielectric substrates 71d, 72d,
Reference numerals 73d and 72c divide the respective inner conductors and constitute open ends of the resonance line.

A shield through hole 70b is provided between the upper resonance lines 71a and 72a and between the resonance lines 72a and 73a. An electrode is formed in the shielding through-hole 70b, and this electrode is connected to an outer conductor at both ends to shield the coupling between the upper resonance lines 71a and 72a and the resonance lines 72a and 73a.

The upper and lower resonance lines 71a and 71b,
72a and 72b and 73a and 73b are paired in an interdigital manner to form a one-stage band elimination circuit.
Filters (BEF) 71, 72, and 73 are configured, respectively. And these BEFs 71, 72, 73
The lower-stage resonance lines 71b and 72b, and 72b and 73b are interdigitally phase-coupled by π / 2 in terms of electrical angle, thereby forming the interdigitally coupled BEF type dielectric filter of the present embodiment. FIG. 11 is a circuit configuration diagram, and FIG. 12 is an equivalent circuit diagram.

FIG. 15 shows an eighth embodiment of an interdigitally coupled BEF type dielectric filter having a six-stage configuration. Reference numeral 80 denotes a rectangular dielectric block. The dielectric block 80 has a cylindrical resonant line formed of three rows and four columns in a geometrical proximity from one end face to the other end face. 81a-86a, 81b-86b
Are provided in total. Inner conductors are provided in the through resonance line holes of these resonance lines 81a to 86a and 81b to 86b.

The resonance lines 81a, 82b, 83a, 84
a, 85b and 86a constitute an open end on one end face of the dielectric block 80 and a short-circuit end on the other end face. Also, the resonance lines 81b, 82a, 83b,
84b, 85a, and 86b form a short-circuited end on one end surface of the dielectric block 80 and an open end on the other end surface. The outer surface of the dielectric block 80 is mainly covered with an outer conductor except for the open ends. A shield electrode 80a is provided in the dielectric block 80 between the lower resonance lines 81b and 86a and the middle resonance lines 82b and 85a. The shield electrode 80 a is connected to the outer conductor.

Then, the left and right resonance lines 81a and 81b,
82a and 82b, 83a and 83b, 84a and 84b, 8
5a and 85b, 86a and 86b are paired in an interdigital manner to form a single-stage band elimination filter (BEF) 81, 82, 83, 84, 8
5 and 86 respectively. These BEF81, 8
Reference numerals 2 , 83 , 84 , 85 , and 86 denote proximity filters, which are interdigitally phase-coupled by π / 2 in terms of electrical angle, thereby forming an interdigitally coupled BEF type dielectric filter of this embodiment. Input and output of this dielectric filter are performed using the resonance lines 81b and 86a.

In these embodiments, the cross-sectional shapes of the above-described through-resonance line hole and shield through-hole do not necessarily have to be circular. Therefore, for example, the shape of the BEF type dielectric filter can be reduced by flattening the cross-sectional shape of the through resonance line hole or the shielding through hole into a rectangle or a substantially elliptical shape.

As one example, FIG. 16 shows a BEF type dielectric filter which is a modification of the seventh embodiment. The same or equivalent parts as those in the seventh embodiment shown in FIG. 14 are denoted by the same reference numerals, and description thereof will be omitted. 71a-73a, 71b-
The through resonance line hole 73b and the shield through hole 70b are substantially elliptical in the modification of the seventh embodiment. Thus, the height of the dielectric block 70 can be reduced.

[0055]

According to the present invention, an interdigital pair-coupled two-resonance line BEF is formed as a single stage in a single dielectric block, and a plurality of stages are formed and coupled to each other, so that the trap frequency is lower and higher. A multi-stage BEF-type dielectric filter having a BPF having a characteristic of attenuating the frequency band on the band side is configured.

Therefore, if the BEF type dielectric filter of the present invention is used in a mobile communication device such as a mobile phone, the conventionally required isolator and BPF can be omitted, and the circuit configuration can be simplified. Can be.

Also, since the number of parts is reduced as compared with the conventional example, the size can be reduced and the cost can be reduced. In addition, since the number of soldered parts is reduced with a decrease in the number of components, reliability is improved, characteristic variations are reduced, and the yield is improved.

The shape of the BEF type dielectric filter can also be reduced by flattening the cross-sectional shape of the through-resonance line hole formed in the dielectric block into a rectangle, a substantially ellipse, or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a first embodiment;

FIG. 3 is an equivalent circuit diagram of the first embodiment.

FIG. 4 is a diagram showing frequency attenuation characteristics of the first embodiment and a conventional example.

FIG. 5 is a perspective view of a second embodiment of the present invention.

FIG. 6 is an equivalent circuit diagram of the second embodiment.

FIG. 7 is a perspective view of a third embodiment of the present invention.

FIG. 8 is an equivalent circuit diagram of the third embodiment.

FIG. 9 is a perspective view of a fourth embodiment of the present invention.

FIG. 10 is a perspective view of a fifth embodiment of the present invention.

FIG. 11 is a circuit diagram of a fifth embodiment.

FIG. 12 is an equivalent circuit diagram of the fifth embodiment.

FIG. 13 is a perspective view of a sixth embodiment of the present invention.

FIG. 14 is a perspective view of a seventh embodiment of the present invention.

FIG. 15 is a perspective view of an eighth embodiment of the present invention.

FIG. 16 is a perspective view of a modification of the seventh embodiment.

FIG. 17 is an exploded perspective view of a conventional example.

FIG. 18 is a general equivalent circuit diagram of a conventional example.

FIG. 19 is a diagram showing frequency attenuation characteristics of a conventional example.

FIG. 20 is a block circuit diagram of a conventional mobile communication device such as a mobile phone using a BEF type dielectric filter.

[Explanation of symbols]

1, 2, 3, 4 Resonance line 1a, 2a, 3a, 4a Resonance line hole 2b, 3b Electrode 1c, 4c, 2c, 3c, 70a, 71d Dielectric substrate 10, 20, 30, 50, 60, 70, 80 Dielectric block 11, 12 BEF 21-25, 31-35 BEF 21a-25a Resonant line 21b-25b Resonant line 31a-31a, 31b-31b Resonant line 41 Shielding electrode 50a Dielectric substrate 51a-53a, 51b-53b Resonant line 51c, 52c, 53c Electrode 51d, 52d, 53d Electrode 54, 80a Shielding electrode 51-53, 61-63, 71-73, 81-86
BEF 60a, 70a
Dielectric body 61a, 62a, 63a Resonant line 61b, 62b, 63b Resonant line 61c, 62c, 63c Electrode 61d, 62d, 63d Electrode 70b Shielding through hole 71a, 72a, 73a Resonant line 71b, 72b, 73b Resonant line 71c, 73c Electrodes 71d, 72c, 72d, 73d
Dielectric substrate 81a, 82a, 83a, 84a, 85a, 86a
Resonant lines 81b, 82b, 83b, 84b, 85b, 86b
Resonant line

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-278401 (JP, A) JP-A-6-69703 (JP, A) JP-A 8-46402 (JP, A) JP-A-5-46402 175703 (JP, A) JP-A-4-220001 (JP, A) Japanese Utility Model Application Laid-open No. 64-8807 (JP, U) Japanese Utility Model Application Laid-open No. 60-129706 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) H01P 1/205

Claims (7)

(57) [Claims] A first and a second end face, and the first and second end faces
Dielectric having four sides connecting between second end faces
Body block and first and second end faces of the dielectric block
At least four resonance lines formed through
A dielectric filter having a pair of adjacent resonance lines having an open end and a short-circuited end in opposite directions.
This pair of resonant lines are interdigitated
One-stage band elimination filter
And at least two of these at least two
Interstage one-stage band elimination filter
Π / 2 phase shift coupling in electrical angle
Band elimination type invitation
Electric body filter . 2. The dielectric filter according to claim 1, wherein
And one of the one-stage band elimination filters
The open ends of the two resonance lines are the resonance lines on which the resonance lines are formed.
It is formed by a dielectric substrate provided in the
The open end of one resonance line is connected to the end face of the dielectric block.
Band elimination characterized by being formed
Type dielectric filter . 3. First and second rectangles each having a short side and a long side.
4 connecting the second end face and the first and second end faces
And a dielectric block having two sides.
A multi-layer formed between the first and second end faces of the block
A dielectric filter having a number of resonance lines, wherein the plurality of resonance lines are arranged in the first and second portions of the dielectric block.
At the second end face in two rows in the short side direction,
A plurality of lines are formed in the side direction, and two lines are formed in the short side direction.
The first resonance line group and the second resonance line
And a first resonance line group, each of which has a short-circuited end.
Is formed on the first end face of the dielectric block,
An open end is formed on the second end face of the dielectric block;
Each of the second resonance line groups has a short-circuited end of a dielectric block.
A dielectric block formed on the second end face and having an open end
A pair of adjacent resonance lines formed on the first end face of the
One stage band energy
A plurality of one-stage filters constitute a limiting filter.
Electrical elimination filter with electrical angle
Characterized by π / 2 phase shift coupling at
Limitation type dielectric filter . 4. A first and second rectangle having a short side and a long side.
4 connecting the second end face and the first and second end faces
And a dielectric block having two sides.
A multi-layer formed between the first and second end faces of the block
A dielectric filter having a number of resonance lines, wherein the plurality of resonance lines are arranged in the first and second portions of the dielectric block.
At the second end face in two rows in the short side direction,
A plurality of lines are formed in the side direction, and two lines are formed in the short side direction.
The first resonance line group and the second resonance line
Line group, and each resonance line of the first resonance line group and
And each resonance line of the second resonance line group has an open end and
And short-circuited ends are formed alternately on the opposite end faces, and
And the resonance line of the first resonance line group formed in the same row
The resonance lines of the resonance line group
Are formed on opposite end faces, and a pair of adjacent resonance lines formed in the same row in the long side direction are
One stage band energy
A plurality of one-stage filters constitute a limiting filter.
Electrical elimination of electrical elimination
Characterized by π / 2 phase shift coupling at
Limitation type dielectric filter . 5. The dielectric member according to claim 3, wherein
A first resonance line group adjacent to the first resonance line group;
It is characterized in that a shielding electrode is provided between the lines
Band elimination type dielectric filter . 6. A first and a second rectangle having a short side and a long side.
4 connecting the second end face and the first and second end faces
And a dielectric block having two sides.
A multi-layer formed between the first and second end faces of the block
A dielectric filter having a number of resonance lines, wherein the plurality of resonance lines are arranged in the first and second portions of the dielectric block.
And two lines on the second end face in the short side direction,
Formed in three or more rows in the side direction and two rows in the short side direction
The arranged resonance lines are respectively the first resonance line group and the second resonance line group.
And adjacent lines formed in the same row in the long side direction
Pair of resonant lines have open ends and short ends
And are interdigitally combined
Each constitutes a one- stage band elimination filter,
These multiple one-stage band elimination filters
Π / electrical angle in electrical angle
2 phase shift coupling, the open ends of the resonance lines of the first resonance line group
The dielectric substrate provided in the formed resonant line hole
Opening of the resonance lines at both ends of the second resonance line group
When the end is formed on any end face of the dielectric block
And a second electrode connected to the connection electrode formed on the end face.
The open ends of the remaining resonance lines of the resonance line group are
With the dielectric substrate provided in the formed resonant line hole
Band elimination characterized by being formed
Type dielectric filter . 7. The method according to claim 1, wherein :
In the dielectric filter, the resonance line is formed.
The cross-sectional shape of the resonant line hole is flattened.
Band elimination type dielectric filter .