JP2564159Y2 - Duplexer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplexer using a dielectric filter, and more particularly to a structure of an input / output terminal.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view of a main part showing a structure of an input / output terminal of a conventional antenna duplexer (diplexer) using a dielectric filter. This figure shows a portion around an antenna terminal ANT of an antenna duplexer 21 including a band elimination filter (hereinafter, BEF) 22 for transmission and a band-pass filter (hereinafter, BPF) 23 for reception shown in FIG. Shows the structure.

In the BEF 22, a series circuit S4 of a dielectric coaxial resonator θ15 and a capacitor C17 and a series circuit S5 of a dielectric coaxial resonator θ16 and a capacitor C18 are cascaded by coils L2, L3,. , Capacitors C19, C20,... Are provided between the connection points g, h,... Of the series circuits S4, S5, and the ground, and a coil L1 and a capacitor Cg are provided between the connection point g and the antenna terminal ANT. An L-shaped circuit for phase adjustment is provided.

On the other hand, the BPF 23 has a plurality of dielectric coaxial resonators θ17, θ18,... Connected in cascade by capacitors C22,. Coupling capacitor C21
Is provided.

The dielectric coaxial resonators θ15, θ16,...
Is composed of a terminal short-circuited quarter-wavelength coaxial resonator in which a predetermined peripheral surface of a prismatic dielectric is covered with a conductive member. The coils L1, L2, L3,... Of the BEF 22 are air-core wound coils, and the capacitors C17, C18,.
Consists of a single chip capacitor. The capacitors Cg, C19, C20,... Are formed by forming a ground electrode on the back surface of the coupling substrate 24 and forming a plurality of electrodes d on the front surface. The unit of the BEF 22 couples the surface electrodes d of the coupling board 24 with the air-core coils L1, L2, L3,... And connects the respective center conductors of the dielectric coaxial resonators θ15, θ16,. A chip capacitor C17,
C18,... Are connected.

The capacitors C21, C22,
Are formed by forming a plurality of electrodes d 'on the front and back surfaces of the coupling substrate 25. The unit of the BPF 23 connects each central conductor of the dielectric coaxial resonators θ17, θ18,.
Are connected to the corresponding predetermined electrodes d '.
A spacer 26 made of an insulating substrate is provided below the coupling substrate 25, and the lower surface of the coupling substrate 25 is
The surface position of the EF 22 is substantially the same as the surface position of the coupling substrate 24.

The antenna terminal ANT is made of a thin metal piece,
The base portion is bent in an L-shape to form a connection portion 27 between the coupling substrate 24 and the coupling substrate 25, and a step is formed at the distal end portion. Antenna terminal ANT is BPF
23 are attached between the coupling substrate 25 and the spacer 26. The BEF 22 unit and the BPF 23
Are arranged adjacent to each other in the case 28, and the connection portion 27 of the antenna terminal ANT and the predetermined surface electrode d forming the capacitor Cg of the coupling board 24 are connected by soldering or the like, so that the BEF 22 and the BPF 23 are connected to each other. Are combined to form an antenna duplexer 21.

[0008]

In the conventional antenna duplexer 21, the coupling board 24 of the BEF 22 and the coupling board 25 of the BPF 23 are arranged adjacent to each other without overlapping.
Since the connection portion 27 of the antenna terminal ANT and the predetermined surface electrode d forming the capacitor Cg of the coupling board 24 are connected by soldering or the like, the dielectric coaxial resonator θ
There is a disadvantage that a dead space 29 is generated between 15 and θ17, and the size of the antenna duplexer 21 is correspondingly increased.

The present invention has been made in view of the above problems, and has as its object to provide a small duplexer having a reduced dead space.

[0010]

In order to solve the above-mentioned problems, the present invention is directed to a second embodiment in which a plurality of dielectric coaxial resonators are connected in multiple stages via a first coupling substrate on which a coupling circuit is formed. A first dielectric filter, a second dielectric filter in which a plurality of dielectric coaxial resonators are connected in multiple stages via a second coupling substrate on which a coupling circuit is formed, and the first dielectric filter. Are connected via a first capacitor,
In the duplexer, wherein the second dielectric filter includes an input / output terminal connected through a series-parallel circuit including a coil and a second capacitor, the first capacitor includes the first capacitor.
The second capacitor has electrodes formed on the front and back surfaces of the second bonding substrate, and the second capacitor has electrodes formed on the front and back surfaces of the second bonding substrate. The input and output terminals are interposed between the first and second substrates.
Are connected to each other to form the first and second capacitors in a two-layer structure.

[0011]

According to the present invention, the first capacitor is formed by forming electrodes on the front and back surfaces of the first coupling substrate for forming the first dielectric filter, and the second capacitor is formed by the second capacitor. An electrode is formed on the front and back surfaces of a second coupling substrate for forming a dielectric filter. First bonding substrate and second
And the input / output terminals are interposed between the substrates, and the lower electrode of the upper coupling substrate, the upper electrode of the lower coupling substrate, and the input / output terminals are integrally connected. As a result, the electrodes forming the first and second capacitors are formed in a two-layer structure, and the structure of the input / output terminal of the duplexer becomes compact.

[0012]

FIG. 1 is a perspective view showing an embodiment of the duplexer according to the present invention. Note that the cover is omitted in FIG.

The duplexer shown in FIG. 1 is an antenna duplexer having the circuit configuration shown in FIG. The antenna duplexer 1 shown in FIG. 3 includes a transmission filter 2 made of BEF and a reception filter 3 made of BPF. The BE
F2 is a series circuit of three dielectric coaxial resonators θi and a capacitor Ci (i = 1, 2, 3) formed of coils L2 and L3.
And capacitors C4, C5, and C6 are provided between the connection points c, d, and e and the ground, and a coil L1 is provided between the connection point c and the antenna terminal ANT.
An L-type circuit 4 for adjusting the phase, which is composed of a capacitor Cg and a capacitor Cg, is provided.

On the other hand, the BPF 3 comprises four dielectric coaxial resonators θ4, θ5,.
10, cascade-connected by a dielectric coaxial resonator θ.
7, a capacitor C11 is provided between the antenna terminal ANT and a connection point a of the dielectric coaxial resonator θ4.
A capacitor C7 is provided between the power supply and the output terminal.

The dielectric coaxial resonator θi (i = 1 to 7) of the antenna duplexer 1 is a quarter-wavelength coaxial resonator having a short-circuited terminal and has a hole 6 formed on the center axis. 5mm
An outer peripheral surface excluding one end surface and an inner peripheral surface of the hole 6 of a dielectric material 5 made of a prismatic ceramic having a rectangular prism shape are covered with a conductive member 7 (dotted portion in FIG. 1) such as silver or copper. ing.

The capacitors C1 to C3 constituting the series circuits S1 to S3 of the BEF2 are each composed of a single chip capacitor 11 to 13 having electrodes formed on the front and back surfaces of a dielectric substrate. It is composed of wire coils. The capacitors C1 and C1 of the BEF2 are used.
2, C3 and Cg are electrodes D on the surface of the rectangular dielectric substrate.
1 to D4 (see FIG. 2 for D1), and a ground electrode D5 (see FIG. 2) on the entire back surface. Then, chip capacitors 11 to 13 constituting the series circuits S1 to S3 are connected to the electrodes D1 to D4 of the dielectric substrate, respectively, and between the electrodes D1 and D2, between the electrodes D2 and D3, and the electrodes D3 and D3.
4 and connect the coils L1, L2, L3 respectively to BE
A coupling substrate 8 of F2 is configured. The input terminal 15 made of a metal flake is connected to the electrode D4.

The BEF 2 of the antenna duplexer 1 has the coupling substrate 8 disposed in front of the open end faces of the dielectric coaxial resonators θ 1 to θ 3 and corresponds to the chip capacitors 11 to 13 provided on the coupling substrate 8. Each dielectric coaxial resonator θ
The central conductors 1 to 3 (the conductive members 7 in the holes 6) are connected by coupling terminals T1, T2, and T3, respectively.

On the other hand, the capacitors C8, C
9 and C10 are formed by electrodes D6, D7,..., D9 formed by being mutually connected to the surface of a rectangular dielectric substrate, and the capacitor C7 is formed by electrodes (not shown) formed on the back surface of the dielectric substrate. The capacitor C11 is formed by coupling between the electrodes D6 on the substrate surface, and the capacitor C11 is formed by coupling between an electrode (not shown) formed on the back surface of the dielectric substrate and the electrode D9 on the substrate surface. The dielectric substrate on which the electrodes D6 to D9 are formed serves as the coupling substrate 9 of the BPF3.

The BPF 3 of the antenna duplexer has the coupling substrate 9 disposed in front of the open end faces of the dielectric coaxial resonators θ4 to θ7, and electrodes D6 and D6 formed on the surface of the coupling substrate 9.
D7,... D9 and the center conductor (conductive member 7 in the hole 6) of each of the dielectric coaxial resonators θ4 to θ7 are respectively connected to coupling terminals T4,
T5,..., T7. Further, an output terminal 16 made of a metal flake is connected to a back electrode facing the electrode D6 of the coupling substrate 9.

A spacer 10 having substantially the same height as the coupling substrate 8 is attached to a lower portion of the coupling substrate 9 so that the lower surface of the coupling substrate substantially coincides with the upper surface of the coupling substrate 9. Is supported.

The antenna duplexer 1 is connected to the BEF.
2 and the BPF 3 are housed in a case 14 and connected as follows. That is, as shown in FIG. 2, one end of the coupling substrate 9 on which the electrode D9 is formed is overlapped with the antenna terminal ANT made of a metal thin piece on the surface of the coupling substrate 8 where the electrode D1 is formed. The back electrode D10 of the coupling substrate 9 and the antenna terminal A
The BEF2 and the BPF3 are connected by connecting the NT and the surface electrode D1 of the coupling substrate 8 by, for example, soldering. Also,
The dielectric coaxial resonators θ1 to θ7 and the back surface electrode D5 of the coupling substrate 8 are connected to the case 14 by soldering or the like.

As described above, the BEF2 capacitor Cg connected to the antenna terminal ANT is formed by the electrodes D1 and D5 formed on the front and back surfaces of the coupling substrate 8, and the BPF3
Is formed by electrodes D9 and D10 formed on the front and back surfaces of the coupling substrate 9, and the coupling substrate 8 and the coupling substrate 9 are overlapped and connected to each other to form the capacitors Cg and the electrodes D1, D5 and D9 of the capacitor C11. , And D10 have a two-layer structure, the horizontal distance of the antenna duplexer 1 is reduced by the overlap of the coupling substrate 8 and the coupling substrate 9, and the dielectric coaxial resonators θ1 and θ7
The antenna duplexer 1 can be made compact without producing a dead space therebetween.

FIG. 4 is a front view of the main part showing the structure of the dielectric filter to which the structure of the input / output terminal of the duplexer according to the present invention is applied. The dielectric filter shown in the same drawing shows the structure of the BPF 3 'shown in FIG.

The BPF 3 'is a dielectric coaxial resonator θ1.
1 to θ14 are cascade-connected by capacitors C13, C14 and C15. A capacitor 16 is provided between the dielectric coaxial resonator θ14 and the input terminal 17, and a capacitor 16 is provided between the dielectric coaxial resonator θ11 and the output terminal 18. A capacitor 12 is provided, and a phase adjusting capacitor Cg 'is provided between the output terminal 18 and the ground.

Each of the coaxial resonators .theta.11 to .theta.14 has the same structure as the above-mentioned square-pole terminal short-circuited quarter-wave coaxial resonator. The capacitors C13, C14, C
Reference numeral 15 is formed by electrodes D11, D12, D13, and D14 formed by being mutually bonded to the surface of a rectangular coupling substrate 19. The coupling capacitor C12 is connected to the electrode D11 and the coupling substrate 19 facing the electrode D11.
The coupling capacitor C16 is formed by the electrode 14 and the electrode D16 formed on the rear surface of the coupling substrate 19 opposite to the electrode D14. The phase adjusting capacitor Cg 'is formed by a pair of electrodes D17 and D1 formed on the front and back surfaces of a spacer 20 formed of an insulating substrate piece for separating the coupling substrate 19 from the side surface of the case 14 by a predetermined distance.
7 '.

The spacer 20 has a paired structure, and the other spacer 20 'has an electrode D18 formed only on its surface.

The dielectric coaxial resonators θ11 to θ14
The coupling substrate 19 is disposed in front of the open end face of the substrate, and the electrodes D11 to D14 formed on the surface of the coupling substrate 19 and the center conductor of each of the dielectric coaxial resonators θ11 to θ14 (the conductive member 7 in the hole 6). Are connected by coupling terminals T11 to T14, and the spacers 20 and 20 'are attached to the lower surfaces of both ends of the coupling substrate 19 with the input / output terminals 17 and 18 made of thin metal sheets interposed therebetween.
The unit 3 'is constituted. The coupling substrate 1
9, input / output terminals 17, 18 and spacers 20, 20 '
Are the back electrodes D15 and D16 of the coupling substrate 19, the input / output terminals 17 and 18, and the front electrodes D1 of the spacers 20 and 20 '.
7 and 18 are connected by soldering.

As described above, the capacitor C for phase adjustment
g 'formed on the front and back surfaces of the spacer 20
7, D17 ', and the spacer 20 is attached to the lower surface on the output end side of the coupling board 19, and the electrodes D1 forming the coupling capacitors C12 and Cg' are formed.
1, D15, D17 and D17 'have a two-layer structure, so that the size of the coupling substrate 19 in the lateral direction is shortened by this, and
The size of the PF 3 ′ can be reduced.

It should be noted that the present invention relates to the above antenna duplexer and B
The present invention is not limited to the PF, but can be generally applied to the structure of a series circuit including two capacitors formed at the input and output ends of a filter circuit.

[0030]

[Effects of the Invention] As described above, according to the present invention,
A first dielectric filter is connected to an input / output terminal via a first capacitor, and a second dielectric filter is connected to an input / output terminal via a series-parallel circuit of a coil and a second capacitor. In the duplexer, the first capacitor is formed by forming electrodes on the front and back surfaces of a first coupling substrate for forming a first dielectric filter, while the second capacitor is formed of a second dielectric filter. The first and second capacitors are formed by forming electrodes on the front and back surfaces of a second coupling substrate for forming a filter, and overlapping both coupling substrates with input / output terminals interposed between the substrates. Since the electrodes to be formed have a two-layer structure, the dimensions of the input / output terminals are shortened accordingly, and the size of the duplexer can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing a structure of an embodiment of a duplexer according to the present invention.

FIG. 2 is a front view of the duplexer.

FIG. 3 is a diagram showing a circuit configuration of the duplexer.

FIG. 4 is an exploded perspective view showing the structure of a dielectric filter to which the structure of the input / output terminal of the duplexer according to the present invention is applied;

FIG. 5 is a diagram showing a circuit configuration of a dielectric filter.

FIG. 6 is an exploded perspective view of a main part showing a structure of a conventional duplexer.

FIG. 7 is a diagram showing a circuit configuration of a conventional duplexer.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna duplexer (demultiplexer) 2 BEF (second dielectric filter) 3 BPF (first dielectric filter) 3 ′ BPF 4 L-type circuit (series-parallel circuit) 5 dielectric 6 hole 7 conductive member 8 Coupling board (first coupling board) 9 Coupling board (second coupling board) 19 Coupling board 10, 20, 20 'Spacer 11-13 Chip capacitor 14 Case 15-18 terminal ANT Antenna terminal (input / output terminal) θ1 θ7, θ11-θ14 Dielectric coaxial resonators C1-C11, C12-C16, Cg 'capacitor C11 capacitor (first capacitor) Cg capacitor (second capacitor) D1-D18, D17' Electrodes T1-T7, T11- T14 coupling terminal

Claims (1)

(57) [Scope of request for utility model registration] A coupling circuit includes a plurality of dielectric coaxial resonators.
A multi-stage connection via the formed first coupling substrate
One dielectric filter is connected to a plurality of dielectric coaxial resonators.
Multi-stage connection via a second coupling substrate on which a coupling circuit is formed.
A second dielectric filter, and the first dielectric filter.
Filter is connected via the first capacitor,
The second dielectric filter includes a coil and a second capacitor
And an input / output terminal connected via a series-parallel circuit.
In the duplexer, the first capacitor includes the first capacitor.
Electrodes are formed on the front and back surfaces of the coupling substrate of
The capacitor has electrodes formed on the front and back surfaces of the second coupling substrate.
The first coupling substrate and the second coupling substrate
And the input and output terminals are interposed between the first and second terminals.
The first and second cores are connected by connecting
That the electrodes forming the capacitors are formed in a two-layer structure.
And a duplexer characterized by: