JPH10256810A - Antenna sharing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the radio waves plunging between two pairs of filters consisting of plural coaxial resonators placed in parallel to each other by arranging these resonators to be set opposite to each other at their short circuit end sides respectively. SOLUTION: The coaxial resonators of an antenna sharing device have two pairs of filters, i.e., the transmitting filters F1 and the receiving filters F2. The short circuit end faces 6 of both filters F1 and F2 are set opposite to each other with the exposed faces 8 turned down respectively. Under such conditions, the filters F1 and F2 are put on a printed board 20. At the same time, each external conductor 11 is attached to a wide conductive part 21 by soldering. A space is secured between both filters F1 and F2. Then the internal conductor 12 of the transmitting input coaxial resonator located at the outermost side of the filter F1 is set opposite to a draw-out conductor 22, and the internal conductor 12 of the receiving output coaxial resonator located at the outermost side of the filter F2 is set opposite to a draw-out conductor 23. Then the electrical capacitive coupling is secured between both conductors 22 and 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna duplexer used for a portable telephone or the like.

[0002]

2. Description of the Related Art As shown in FIG. 7, an antenna duplexer used in a conventional portable telephone or the like has an outer peripheral surface 51 provided with an outer conductor 61 and an inner peripheral surface 5 provided with an inner conductor 62.
2, a short-circuited end face 53 provided with an end face conductor (not shown) connecting the outer conductor 61 and the inner conductor 62;
1 and an inner conductor 62 have a coaxial resonator K made of a ceramic dielectric 50 having an unconnected open end face 54. Then, two sets of such coaxial resonators K, four in this case, two sets of filters F3,
F4.

In such filters F3 and F4, as shown in FIG. 7, four coaxial resonators K are arranged side by side so that the open end faces 54 are flush with each other.
Are integrated by soldering. And both filters F
3 and F4, the outer end surfaces 54 of the two filters F3 and F4 are further soldered to each other by making the open end surfaces 54 the same surface and abutting the outer peripheral surfaces 51 of the two filters F3 and F4.
3, F4 are integrated. And both filters F
One filter F3 of F3 and F4 is used for transmission, and the other filter F4 is used for reception. The input conductor is connected to the internal conductor 62 of the coaxial resonator K1 for transmission input of the filter F3 for transmission. 55, and the inner conductor 62 of the coaxial resonator K2 for receiving output of the receiving filter F4.
, An output conducting wire 56 is drawn out. Further, an output coaxial resonator K3 of the transmitting filter F3 and an internal conductor 62 of the input coaxial resonator K4 of the receiving filter F4 are connected to the antenna for the antenna. The conductors 57 and 58 are drawn out, and the antenna conductors 57 and 58 are connected.

[0004]

In the conventional antenna duplexer, the two sets of filters are arranged such that their outer peripheral surfaces abut each other and their open end faces are the same, so that the open end faces of both filters are close to each other. However, there is a problem that the radio wave rejects significantly between the two, and the performance is poor.

[0005]

As a first means for solving the above problems, an outer peripheral surface provided with an outer conductor, an inner peripheral surface provided with an inner conductor, the outer conductor and the inner conductor are provided. A coaxial resonator made of a dielectric having an open end face to which the outer conductor and the inner conductor are not connected, and a plurality of the coaxial resonators are juxtaposed. Two sets of filters are provided, and the two sets of filters are arranged so that the short-circuit end faces face each other. As a second solution, the two sets of filters are housed and held between a metal housing and a printed circuit board. Further, as a third solution, one of the two sets of filters is used for transmission and the other is used for reception, and the side face of the transmission input coaxial resonator located on the outermost side of the transmission filter, On the side of the coaxial resonator for reception output located on the outermost side of the
The side walls of the housing are opposed to each other, and the side walls of the housing are brought into contact with external conductors provided on the side surfaces of the two coaxial resonators.

As a fourth solution, the open end face side of the coaxial resonator constituting the two sets of filters is covered with a side wall of the housing. Further, as a fifth solving means, a coaxial resonator for transmitting input and a coaxial resonator for transmitting output located on the outermost side of the transmitting filter, and a coaxial resonator for receiving output located on the outermost side of the receiving filter And a coaxial resonator for receiving input, and electrically couples between an internal conductor provided in each of the coaxial resonators and a plurality of lead conductors provided on the printed circuit board, and An input terminal connected to the lead conductor facing the internal conductor of the coaxial resonator for output, an output terminal connected to the lead conductor facing the internal conductor of the reception output coaxial resonator, The lead conductor facing the internal conductor of the transmission output coaxial resonator and the antenna terminal connected to the lead conductor facing the internal conductor of the reception input coaxial resonator are connected to the pre-connector. It has a structure provided in the preparative substrate. As a sixth solving means, an upper wall of the housing that covers the two sets of filters and shields the vicinity of the opposed short-circuit end face, on an upper surface of the coaxial resonator constituting the two sets of filters. Was arranged. Further, as a seventh solving means, a bar provided on the upper wall of the housing is arranged on the upper surface of the coaxial resonator along a joint portion of the plurality of coaxial resonators arranged side by side. . As an eighth solution, a small hole is provided in the upper wall of the housing located on the upper surface of the coaxial resonator. Further, as a ninth solution, a wide conductive portion is provided on the printed board, and the lower surfaces of the coaxial resonators constituting the two sets of filters are brought into contact with the conductive portion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an antenna duplexer used in a portable telephone or the like of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a plan view of the antenna duplexer of the present invention.
Is a cross-sectional view of a main part of the antenna duplexer of the present invention viewed from the plane,
FIG. 3 is a cross-sectional view of a main part of the present invention viewed from the front, FIG. 4 is an exploded perspective view of the antenna duplexer of the present invention, and FIG. 5 is a perspective view of an inverted coaxial resonator according to the antenna duplexer of the present invention. 6 is a perspective view of the coaxial resonator of FIG. 5 as viewed from the back.

As shown in FIGS. 1 to 6, particularly FIGS. 5 and 6, the antenna duplexer according to the present invention has an upper surface 2, a lower surface 3, and two side surfaces 4 which are outer peripheral surfaces on which an outer conductor 11 is provided.
, An inner peripheral surface 5 on which an inner conductor 12 is provided, and an outer conductor 1
1 has a short-circuited end face 6 provided with an end face conductor 13 connecting the internal conductor 12 to the inner conductor 12 and a coaxial resonator D made of a ceramic dielectric 1 having an open end face 7 where the outer conductor 11 and the inner conductor 12 are not connected. doing. On the open end surface 7 side of the lower surface 3 of the dielectric 1, an exposed surface 8 without an external conductor 11 is provided. And such a coaxial resonator D is shown in FIGS.
As shown in FIG. 4, there are provided two sets of filters F1 and F2, each of which is constituted by a plurality of, here four, juxtaposed.

In such filters F1 and F2, four coaxial resonators D are arranged side by side so that the open end face 7 and the exposed face 8 are flush with each other. The external conductors 11 provided on the outer peripheral surface are integrated by soldering. Then, both filters F1,
One filter F1 of F2 is used for transmission, and the other filter F2 is used for reception. The rectangular printed circuit board 20 for mounting the filters F1 and F2 has a wide conductive portion 2 provided on one surface thereof.
1 and one end of the wide conductive portion 21 near the conductive portion 21.
Conductor 2 provided at a position facing each other across
2, 23; an input terminal 24 and an output terminal 25 connected to each of the lead conductors 22, 23;
Leader conductors 26 and 27 provided near the other end of the wide conductive portion 21 and opposed to each other with the conductive portion 21 interposed therebetween;
An antenna terminal 28 connected to the lead conductors 26 and 27 is provided. In addition, the printed circuit board 20 is provided with lead conductors 22, 23, and 2, except for a part of the input terminal 24, the output terminal 25, and the antenna terminal 28.
An insulating resist film 29 is provided on 6 and 27 and on a connecting portion connecting these conductors and the terminals.

The two sets of filters F1, F2,
That is, the transmission filter F1 and the reception filter F2 are
The short-circuited end surfaces 6 are placed on the printed circuit board 20 with the exposed surfaces 8 facing downward, and the external conductors 11
Is attached to the wide conductive portion 21 by soldering. The filters F1 and F2 are attached at an interval, and when attached, the inner conductor 12 of the transmission input coaxial resonator D1 located on the outermost side of the transmission filter F1 passes through the dielectric 1. Pull out conductor 22
The inner conductor 12 of the reception output coaxial resonator D2, which is located on the outermost side of the reception filter F2, faces the lead-out conductor 23 via the dielectric 1, and is opposed to the inner conductor 12, respectively. Electrical coupling between the lead conductors 22 and 23.

Furthermore, the inner conductor 12 of the transmission output coaxial resonator D3 located on the outermost side of the transmission filter F1 faces the lead-out conductor 26 via the dielectric 1, and the reception filter F2 The inner conductor 12 of the receiving input coaxial resonator D4 located on the outermost side faces the extraction conductor 27 via the dielectric 1, and is disposed between the internal conductor 12 and the respective extraction conductors 26 and 27. Electrical capacitive coupling is performed. Then, the open end faces 7 of the filters F1 and F2 attached in this manner are arranged at a large interval from each other, so that the radio waves do not dive between the two, and the filters F1 and F2 have the same size. The outer conductor 11 on the lower surface 3 has a wider conductive portion 21 so that the electric wave between the filters F1 and F2 on the lower surface can be reduced. The resist film 29 is formed of the conductor 2
2, 23, 26, and 27 are insulated from the external conductor 11 to facilitate electrical withdrawal in the coaxial resonator D.

The metal box-shaped housing 30 is provided on the upper wall 3.
1 and a bar 33 formed by providing a hole 32 in the upper wall 31.
And the upper wall 3 corresponding to each of the plurality of coaxial resonators D.
1, a pair of opposed side walls 35 bent downward from the upper wall 31, and an upper wall 3.
And a pair of opposed side wall portions 36 bent downward from 1. The housing 30 is placed over the printed circuit board 20 so as to cover the filters F1 and F2 attached to the printed circuit board 20 from above. Then, when the housing 30 is placed, its upper wall 31
Are arranged so as to be in contact with the outer conductor 11 on the upper surface 2 of the filters F1 and F2 and to shield the upper part near the opposing short-circuit end face 6. The small holes 34 are arranged on the upper surface 2 of the coaxial resonators D along with the aligned portions of the coaxial resonators D, and the small holes 34 are located on the upper surface 2 of each coaxial resonator D.

In the small holes 34, the upper wall 31 and the coaxial resonators D are attached and electrically connected by soldering. Further, when the housing 30 is attached, the side walls 35 have the outer conductors 11 provided on the side surfaces 4 of the outermost transmission input coaxial resonator D1 and the outermost reception output coaxial resonator D2. And the other side wall 35 is in contact with the external conductor 11 provided on the side surface 4 of the coaxial resonator D3 for transmission output and the coaxial resonator D4 for reception input. Further, when the housing 30 is attached, the pair of side walls 36 are in a state of covering the open end surfaces 7 of the filters F1 and F2, and the side walls 35 of the housing 30 mounted on the printed circuit board 20. The side walls 36 are insulated from the terminals 24, 25, 28 by the resist film 29.

In the antenna duplexer having the above-described structure, the wide conductive portion 21 prevents radio waves from entering on the lower surface, the upper wall 31 prevents radio waves from entering on the upper surface, and the side walls 35 prevent side waves from entering. , And the side wall portion 36 blocks the open end face 7 side, thereby preventing the radio wave from jumping out from the open end face 7 side. And such an antenna duplexer,
When receiving, the signal is input from the antenna terminal 28 and output from the output terminal 25. When transmitting, the signal is input from the input terminal 24 and output from the antenna terminal 28. In addition to the above embodiment, as shown by a dotted line in FIG.
Three methods of electric capacitive coupling between the internal conductor 12 and the electrode part 9, between the internal conductor 12 and the lead conductors 22, 23, 26 and 27, and between the electrode part 9 and the lead conductors 22, 23, 26 and 27. May be arbitrarily selected and performed.

[0015]

According to the antenna duplexer of the present invention, the two sets of filters are arranged such that the short-circuited end faces are opposed to each other, so that the open end faces of the two sets of filters can be largely separated from each other. In addition, it is possible to improve the performance by reducing the rejection of radio waves and to provide a flat antenna duplexer. In addition, since two sets of filters are housed in the housing and the printed circuit board, damage to the dielectric due to external impact or the like is small, and handling is improved. Further, by making the side wall of the housing contact the side surfaces of the outermost transmission input coaxial resonator and the reception output coaxial resonator, it is possible to reduce radio wave penetration on the side surfaces. In addition, by covering the open end face of the coaxial resonator with the side wall of the housing, it is possible to prevent radio waves from jumping out of the open end face. In addition, since the extraction is performed by the electric capacitive coupling between the internal conductor and the extraction conductor of the printed circuit board, the extraction is easy, and the terminals can be arranged at an arbitrary place, thereby providing a terminal structure with a high degree of freedom. it can.
Further, since the upper wall of the housing is arranged so as to straddle the two sets of filters and shield the vicinity of the opposing short-circuited end face, grounding on the upper surface of the coaxial resonator is ensured, and radio wave penetration on the upper surface can be reduced. . In addition, since the crosspiece of the housing is arranged along the mating portion of the coaxial resonator, the holding of the coaxial resonator is reliable and the grounding is good. Further, by providing a small hole in the upper wall, a solder pool is formed, soldering becomes easy, and reliable soldering can be performed. Further, by providing a wide conductive portion on the printed circuit board, it is possible to reduce the penetration of radio waves on the lower surface and improve the performance.

[Brief description of the drawings]

FIG. 1 is a plan view of an antenna duplexer according to the present invention.

FIG. 2 is a cross-sectional view of a main part of the duplexer of the present invention as viewed from a plane.

FIG. 3 is a cross-sectional view of a main part of the duplexer of the present invention as viewed from the front.

FIG. 4 is an exploded perspective view of the antenna duplexer of the present invention.

FIG. 5 is a perspective view of the coaxial resonator according to the antenna duplexer of the present invention turned upside down.

FIG. 6 is a perspective view of the coaxial resonator of FIG. 5 as viewed from the back.

FIG. 7 is a perspective view of a conventional antenna duplexer.

[Explanation of symbols]

 D Coaxial resonator D1 Coaxial resonator D2 Coaxial resonator D3 Coaxial resonator D4 Coaxial resonator 1 Dielectric 2 Upper surface 3 Lower surface 4 Side surface 5 Inner peripheral surface 6 Short-circuit end surface 7 Open end surface 8 Exposed surface 9 Electrode unit 11 External conductor 12 Internal Conductor 13 End surface conductor 20 Printed circuit board 21 Conductive part 22 Leader conductor 23 Leader conductor 24 Input terminal 25 Output terminal 26 Leader conductor 27 Leader conductor 28 Antenna terminal 29 Resist film 30 Housing 31 Upper wall 32 Hole 33 Bar 34 Small hole 35 Side wall 36 Side wall

Claims (9)

[Claims] An outer peripheral surface provided with an outer conductor; an inner peripheral surface provided with an inner conductor; a short-circuited end surface provided with an end conductor connecting the outer conductor and the inner conductor; The conductor includes a coaxial resonator made of a dielectric material having an unconnected open end surface, and has two sets of filters configured by juxtaposing a plurality of the coaxial resonators, wherein the two sets of filters are An antenna duplexer wherein short-circuited end faces are arranged to face each other. 2. The duplexer according to claim 1, wherein said two sets of filters are housed and held between a metal housing and a printed circuit board. 3. A side face of a coaxial resonator for transmission input located on the outermost side of the transmission filter, one of the two sets of filters being used for transmission and the other being used for reception. The side wall of the housing is opposed to the side surface of the reception output coaxial resonator located on the outside, and the side wall of the housing is brought into contact with an external conductor provided on the side surface of both coaxial resonators. The antenna duplexer according to claim 2. 4. The antenna duplexer according to claim 2, wherein an open end face side of said coaxial resonator constituting said two sets of filters is covered with a side wall of said housing. 5. A transmission input coaxial resonator and a transmission output coaxial resonator located at an outermost position of the transmission filter, and a reception output coaxial resonator and a reception input coaxial resonator located at an outermost position of the reception filter. The transmission input coaxial resonator comprising a coaxial resonator, and electrically coupling between an internal conductor provided in each of the coaxial resonators and a plurality of lead conductors provided on the printed circuit board. An input terminal connected to the lead conductor facing the internal conductor of the input terminal; an output terminal connected to the lead conductor facing the internal conductor of the reception output coaxial resonator; and the transmission output coaxial. The printed circuit board is provided with the lead conductor facing the internal conductor of the resonator, and an antenna terminal connected to the lead conductor facing the internal conductor of the reception input coaxial resonator. The method according to claim 3 or 4, wherein
The antenna duplexer described. 6. An upper wall of the housing, which straddles the two sets of filters and shields the vicinity of the opposing short-circuit end face, is disposed on the upper surface of the coaxial resonator constituting the two sets of filters. Claim 2, or 3, or 4, characterized in that
Or the antenna duplexer according to 5. 7. A crosspiece provided on an upper wall of the housing is provided on an upper surface of the coaxial resonator along a joint portion of the plurality of coaxial resonators arranged side by side. The antenna duplexer according to 2, 3 or 4, or 5, or 6. 8. The method according to claim 2, wherein a small hole is provided in an upper wall of the housing located on an upper surface of the coaxial resonator. Antenna duplexer. 9. The printed circuit board according to claim 2, wherein a wide conductive portion is provided, and lower surfaces of said coaxial resonators constituting said two sets of filters are brought into contact with said conductive portion. Or 4, or 5, or 6, or 7, or 8
The antenna duplexer described.