JP2007295361A - Duplexer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duplexer which can shorten a transmission channel between a transmission filter and a reception filter, has a small number of parts, and further can be easily downsized and furthermore can be reduced in loss. <P>SOLUTION: A transmission-side dielectric filter 1 is incorporated with a plurality of quarter-wavelength type dielectric resonators, a first input/output electrode capacitively-coupled to one of the resonators, and a first trap resonator capacitively-coupled to the electrode. A reception-side dielectric filter 21 is incorporated with a plurality of quarter-wavelength type dielectric resonators, a second input/output electrode capacitively-coupled to one of the resonators, and a second trap resonator capacitively-coupled to the electrode. First and second terminals of the transmission channel 30 for connecting the transmission-side dielectric filter 1 and reception-side dielectric filter 21 are connected with the first and second input/output electrodes, respectively. A connection is defined as an input/output common terminal 31 between the first terminal of the transmission channel 30 and the first input/output electrode. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a duplexer, and more particularly to a duplexer formed by connecting two dielectric filters with a transmission line. The duplexer of the present invention is used to configure a base station transceiver in wireless communication equipment using microwaves, for example, mobile communication.

  In the technology of configuring a duplexer by connecting two filters, for example, as described in US Pat. No. 3,656,162 (Patent Document 1) or JP-A-62-2136105 (Patent Document 2), The length of the cable connecting the transmission filter and the antenna terminal is ¼ of the wavelength of the center frequency of the reception filter, and the length of the cable connecting the reception filter and the antenna terminal is 1 of the wavelength of the center frequency of the transmission filter. / 4 is performed. By doing so, it appears as if the transmission filter is not connected to the reception radio wave entering from the antenna as seen from the antenna terminal that is the transmission / reception branch point, and the reception radio wave flows to the reception filter side. In addition, for the transmission radio wave emitted from the transmitter and passed through the transmission filter, it appears as if the reception filter is not connected when viewed from the antenna terminal that is a transmission / reception branch point, and the transmission radio wave flows to the antenna side.

  In this method, the distance from the transmission / reception branch point to the transmission filter and the reception filter needs to be about 1/4 of the wavelength of the center frequency of the filter, that is, the total cable (transmission line) length is the wavelength of the center frequency of the filter. About 1/2 of this is necessary, and the installation space of the transmission line becomes large, which is disadvantageous for downsizing of the device. In addition, this method requires a connection with the antenna-side transmission line at a transmission / reception branch point existing in the middle of the transmission line, and there is a problem that the connection is troublesome.

  On the other hand, in US Pat. No. 5,015,973 (Patent Document 3) or JP-A-64-60004 (Patent Document 4), an impedance element is interposed in a connection path of two filters in a duplexer to It has been proposed to shorten the length.

However, in this method, since an impedance element is added, there is a problem that a loss due to the connection increases, and the number of parts increases, which is disadvantageous for downsizing of the device.
US Pat. No. 3,656,162 JP-A-62-136105 US Pat. No. 5,015,973 Japanese Unexamined Patent Publication No. 64-6604

  In view of the above-described problems of the conventional technology, the object of the present invention is to reduce the length of the transmission line between the transmission filter and the reception filter, reduce the number of components, and reduce the size. It is to provide an easy and low loss duplexer.

According to the present invention, the object as described above is achieved.
A duplexer comprising a first dielectric filter, a second dielectric filter, and a transmission line for connecting them,
The first dielectric filter includes one of a plurality of first quarter wavelength dielectric resonators and the first quarter wavelength dielectric resonator in a first dielectric block. A first input / output electrode capacitively coupled to the first input / output electrode and a first trap resonator capacitively coupled to the first input / output electrode;
The second dielectric filter includes, in a second dielectric block, one of a plurality of second quarter wavelength type dielectric resonators and the second quarter wavelength type dielectric resonators. A second input / output electrode capacitively coupled to the second input / output electrode and a second trap resonator capacitively coupled to the second input / output electrode;
The transmission line has a first end connected to the first input / output electrode and a second end connected to the second input / output electrode, and the first end of the transmission line A duplexer characterized in that a connection portion with the first input / output electrode is an input / output common terminal;
Is provided.

  In one aspect of the present invention, the resonance frequency of the first trap resonator is the phase of the center frequency of the second dielectric filter in the reflection characteristic on the input / output common terminal side of the first dielectric filter. Is set in the range of −10 ° to + 10 °. In one aspect of the present invention, the capacitive coupling between the first trap resonator and the first input / output electrode is the second characteristic in the reflection characteristic on the input / output common terminal side of the first dielectric filter. The phase of the center frequency of the dielectric filter is set in the range of −10 ° to + 10 °.

  In one aspect of the present invention, the resonance frequency of the second trap resonator is the phase of the center frequency of the first dielectric filter in the reflection characteristic on the input / output common terminal side of the second dielectric filter. Is set in the range of −10 ° to + 10 °. In one aspect of the present invention, the capacitive coupling between the second trap resonator and the second input / output electrode is the first dielectric filter having a reflection characteristic on the input / output common terminal side of the first dielectric filter. The phase of the center frequency of the dielectric filter is set in the range of −10 ° to + 10 °. Here, the reflection characteristic on the input / output common terminal side of the second dielectric filter is the reflection characteristic on the first end side of the transmission line, although the transmission line is connected to the second dielectric filter. That is.

  In one aspect of the present invention, the length of the transmission line is ¼ of the wavelength corresponding to the higher one of the center frequency of the first dielectric filter and the center frequency of the second dielectric filter. It is as follows.

  In one aspect of the present invention, the first input / output electrode is made of a conductive film attached to an open end surface of the first dielectric block, and the second input / output electrode is the second dielectric block. It consists of the electrically conductive film attached | subjected to the open end surface.

  In one aspect of the present invention, each of the first dielectric block and the second dielectric block has a rectangular parallelepiped outer shape and a short-circuit surface opposite to the open surface is in contact with the surface of the conductive substrate. The first input / output electrodes and the second input / output electrodes are arranged in parallel to each other so as to be located at corresponding ends. In one aspect of the present invention, a first shield case is attached so as to cover the open surface of the first dielectric block, and the first input / output electrode is provided in the first shield case. A first conductive pin extending to the outside of the first shield case through the formed opening is fixed, and the second shield case is attached so as to cover the open surface of the second dielectric block A second conductive pin extending to the outside of the second shield case through the opening provided in the second shield case is fixed to the second input / output electrode; The transmission line is disposed outside the first shield case and outside the second shield case, and the first end is connected to the first conductive pin, The second end is the first Is connected to the conductive pin, said first conductive pin constitutes the output common terminal. In one aspect of the present invention, the transmission line is a coaxial cable.

  According to the duplexer of the present invention as described above, the first dielectric filter is capacitively coupled to both one of the first quarter-wavelength type dielectric resonators and the first trap resonator. A second input / output electrode that is capacitively coupled to both one of the second quarter-wavelength type dielectric resonators and the second trap resonator in the second dielectric filter. An electrode is provided, and a transmission line having a first end connected to the first input / output electrode and a second end connected to the second input / output electrode is used. Since the connection portion between the end and the first input / output electrode is used as the input / output common terminal, the resonance frequency of the first trap resonator and also the capacitive coupling between the first trap resonator and the first input / output electrode. And / or the resonance frequency of the second trap resonator and also the second trap resonance. The phase of the transmission line can be shortened by adjusting and appropriately setting the capacitive coupling between the input / output electrodes and the second input / output electrode, so that the number of parts can be reduced and the miniaturization is facilitated. And the loss is small.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding reference numerals are given to members or portions having the same function.

  FIG. 1 is a perspective view showing an embodiment of a duplexer according to the present invention, FIG. 2 is an exploded perspective view showing portions of the first dielectric filter and the first shield case, and FIG. It is an expansion perspective view which shows the dielectric material filter.

  In FIG. 3, the first dielectric filter 1 includes a first dielectric block 2 having a rectangular parallelepiped shape having a length W, a width H, and a height L. The first dielectric block 2 includes a plurality (six in the figure) of first quarter-wavelength type dielectric resonators 3A, 3B, 3C, 3D, 3E, 3F, and a first trap resonator. 4 and a trap resonator 5 are formed. These resonators are arranged in the order of the resonator 4, the resonators 3 </ b> A, 3 </ b> B, 3 </ b> C, 3 </ b> D, 3 </ b> E, 3 </ b> F, and the resonator 5 along the length direction of the dielectric block 2. Each of these resonators includes an inner conductor made of a conductive film formed on the inner surface of a through hole penetrating in the height direction from the upper surface 2a of the dielectric block 2 to the lower surface 2b, and the upper surface 2a of the dielectric block 2. And an outer conductor made of a conductive film formed on the outer surface (lower surface and four side surfaces). On the upper surface 2a of the dielectric block 2, patterned conductive films 3A ', 3B', 3C ', 3D connected to the inner conductors of the resonators 3A, 3B, 3C, 3D, 3E, 3F, 4 and 5 are provided. ', 3E', 3F ', 4' and 5 'are formed.

  A first input / output electrode 6 is further formed on the upper surface 2a of the dielectric block 2 between the patterned conductive film 3A ′ and the patterned conductive film 4 ′. An electrode 7 is formed between the conductive film 5 ′. The electrode 6 is capacitively coupled to both the adjacent patterned conductive film 3 </ b> A ′ and thus the resonator 3 </ b> A and the patterned conductive film 4 ′ and thus the resonator 4. Further, the electrode 7 is capacitively coupled to both the adjacent patterned conductive film 3F ′ and thus the resonator 3F and the patterned conductive film 5 ′ and thus the resonator 5, respectively.

  The upper surface 2a of the dielectric block 2 is called an open surface because the inner conductor of each resonator is not connected to the inner conductors of other resonators. On the other hand, the lower surface 2b of the dielectric block 2 is called a short-circuited surface because the inner conductor of each resonator is connected (short-circuited) to the inner conductor of another resonator.

  The first dielectric filter 1 is used as a transmission filter. By appropriately setting the length W, width H and height L of the dielectric block 2 and the resonance frequency and arrangement of the resonators 3A, 3B, 3C, 3D, 3E, 3F, 4 and 5, the desired pass A transmission filter having characteristics such as a band can be obtained.

  As shown in FIGS. 2 and 4, the first shield case 8 is attached to the dielectric block 2 so as to cover the open surface 2 a. The shield case 8 is formed with a plurality of openings 81 particularly in the flat upper portion thereof, and the conductive pins 86 and 87 pass through the openings 81 respectively corresponding to the electrodes 6 and 7. FIG. 4 shows a cross-sectional view around the conductive pin 86. An insulating glass body 86 a is attached to the conductive pin 86, and the glass body is supported by the shield case 8. The lower end portion of the conductive pin 86 is joined to the input / output electrode 6 by solder 86b. The upper end portion of the conductive pin 86 is located outside the shield case 8 (that is, the upper side in FIG. 4). In other words, the conductive pin 86 extending to the outside of the shield case through the opening 81 provided in the shield case 8 is fixed to the input / output electrode 6. The conductive pin 87 is also supported by the shield case 8 and joined to the electrode 7 in the same manner as the conductive pin 86.

  As shown in FIG. 2, a tab 82 protruding upward is provided on the flat upper portion of the shield case 8. In the flat side portion of the shield case 8, the flat upper portion is spaced apart from the open surface 2a of the dielectric block 2 in the vertical direction so as to be in contact with the open surface 2a of the dielectric block 2. A protrusion 83 is provided. Further, on the flat plate-like upper portion of the shield case 8, clamping protrusions 84 that are in contact with the end faces at both ends in the length direction of the dielectric block 2 are provided. The flat side portion of the shield case 8 is preferably joined to the side surface of the dielectric block 2 with the outer conductor by solder or the like.

  Although the first dielectric filter 1 has been described above, the second dielectric filter 21 has the same configuration.

  That is, as shown in FIG. 1, the second dielectric filter 21 has a second dielectric block 22 having a rectangular parallelepiped outer shape. The dielectric block 22 has a rectangular parallelepiped shape, but the length W, the width H, and the height L may be different from those of the first dielectric block 2. The second dielectric block 22 includes a plurality of second quarter-wavelength type dielectric resonators (corresponding to 3A, 3B, 3C, 3D, 3E, and 3F in the first dielectric filter 1), A second trap resonator (corresponding to 4 in the first dielectric filter 1) and a trap resonator (corresponding to 5 in the first dielectric filter 1) are formed. These resonators are arranged along the length direction of the dielectric block 22 as in the case of the first dielectric filter 1. Each of these resonators includes an inner conductor made of a conductive film formed on the inner surface of a through hole penetrating in the height direction from the upper surface to the lower surface of the dielectric block 22 and an outer surface excluding the upper surface of the dielectric block 22 ( And an outer conductor made of a conductive film formed on the lower surface and the four side surfaces). On the upper surface of the dielectric block 22, similarly to the case of the first dielectric filter 1, a patterned conductive film (3A ′, 3B in the first dielectric filter 1 is connected to the inner conductor of the resonator. ', 3C', 3D ', 3E', 3F ', 4' and 5 '). Note that the number of the second quarter wavelength type dielectric resonators may be different from that of the first dielectric filter 1.

  On the upper surface of the dielectric block 22, a patterned conductive film corresponding to 3A ′ in the first dielectric filter 1 and a patterned conductive film corresponding to the patterned conductive film 4 ′ in the first dielectric filter 1 are further provided. A second input / output electrode (corresponding to 6 in the first dielectric filter 1) is formed between the pattern conductive film corresponding to 3F ′ in the first dielectric filter 1 and the first Electrodes (corresponding to 7 in the first dielectric filter 1) are formed between the patterned conductive film corresponding to 5 ′ in the dielectric filter 1.

  In the following description, the member in the second dielectric filter 21 corresponding to the member X (arbitrary code) in the first dielectric filter 1 is described as a member corresponding to “X”.

  In the second dielectric filter 21, the “6 corresponding” second input / output electrodes are the adjacent “3A ′ compatible” patterned conductive film, and hence the “3A compatible” resonator and the “4 ′ compatible” pattern. Capacitively coupled to both the conductive film and the "4 compatible" resonator. In addition, the electrode corresponding to “7” corresponds to the adjacent “3F′-compatible” patterned conductive film, that is, “3F-compatible” resonator, and “5′-compatible” patterned conductive film, that is, “5-compatible” resonator. Both are capacitively coupled.

  The upper surface of the dielectric block 22 is an open surface, and the lower surface of the dielectric block 2 is a short-circuit surface.

  The second dielectric filter 21 is used as a reception filter. By appropriately setting the length, width and height of the dielectric block 22 and the resonance frequency and arrangement of the resonators corresponding to “3A, 3B, 3C, 3D, 3E, 3F, 4 and 5”, etc. A reception filter having characteristics such as a desired pass band different from the pass band of the transmission filter can be obtained.

  As shown in FIG. 1, a second shield case 28 is attached to the dielectric block 22 so as to cover the open surface. The second shield case 28 has the same configuration as the first shield case 8.

  The lower end portion of the “86 compatible” conductive pin is joined to the “6 compatible” input / output electrode by solder. This conductive pin is provided with an insulating glass body corresponding to “86a”, and the glass body is supported by the shield case 28. The upper end portion of the “86 compatible” conductive pin is located outside the shield case 28 (that is, the upper side in FIG. 1). That is, a “86-compatible” conductive pin extending to the outside of the shield case through an “81-compatible” opening provided in the shield case 28 is fixed to the “6-compatible” input / output electrode.

  Similarly to the “86 compatible” conductive pin, the “87 compatible” conductive pin is supported by the shield case 28 and joined to the “7 compatible” electrode.

  The dielectric block 2 and the dielectric block 22 are made of, for example, alumina ceramics, have a relative dielectric constant of, for example, 5 to 20, and a width H of, for example, 10 to 30 mm.

  As shown in FIG. 1, the dielectric filter 1 and the dielectric filter 21 are attached to a conductive substrate 10 made of metal or the like. Here, both the dielectric block 2 and the dielectric block 22 are attached so that the short-circuit surface opposite to the open surface is in contact with the surface of the conductive substrate 10, and are arranged in parallel to each other. The electrode 6 of the dielectric filter 1 and the “corresponding 6” electrode of the dielectric filter 21 are located at corresponding ends (left end in FIG. 1).

  In FIG. 1, a transmission line 30 made of a coaxial cable is disposed outside the shield cases 8 and 28. The transmission line 30 is connected to the conductive pin 86 whose central conductor at the first end is fixed to the electrode 6, and the central conductor at the second end is fixed to the "corresponding to 6" electrode. Connected to “86 compatible” conductive pins. The connection portion between the first end of the transmission line 30 and the electrode 6 constitutes the input / output common terminal 31. In other words, the conductive pin 86 fixed to the electrode 6 constitutes the input / output common terminal 31. That is, the central conductor at one end of the coaxial cable 32 for connection to the antenna is connected to the conductive pin 86. The other end of the coaxial cable 32 is provided with a connector 32 ′ for connection with the wiring on the antenna side.

  On the other hand, the conductive conductor fixed to the electrode 7 of the first dielectric filter 1 is connected to the central conductor at one end of the coaxial cable 33 for connection to the output circuit section of the transmitter. The central conductor at the other end of the coaxial cable 33 is provided with a connector 33 ′ for connection with the wiring on the transmitter side. Similarly, the central conductor at one end of the coaxial cable 34 for connection to the input circuit section of the receiver is connected to the conductive pin fixed to the “7-compatible” electrode of the second dielectric filter 21. ing. The central conductor at the other end of the coaxial cable 34 is provided with a connector 34 'for connection with the wiring on the receiver side.

  The outer conductor of the coaxial cable of the transmission line 30 is connected to the tab 82 of the shield case 8 and the “82 corresponding” tab of the shield case 28, and these shield cases and the dielectric blocks 2, 22 connected thereto. It is connected to the ground through the outer conductor.

  FIG. 5 is a perspective view showing a state in which the duplexer of the above embodiment is housed in a conductive case, and FIG. 6 is an exploded perspective view thereof. That is, the lower end surface of the conductive side wall member 11 made of metal or the like is fixed to the conductive substrate 10 so that the coaxial cables 32, 33, 34 penetrate the side wall member, and the connectors 32 ′, 33 ′, 34. 'Is positioned outside the side wall member 11. Further, a conductive cover plate 12 made of metal or the like is attached to the upper end surface of the side wall member 11. Thus, a conductive case is constituted by the conductive substrate 10, the conductive side wall member 11, and the conductive cover plate 12, and the duplexer is surrounded by the conductive case. As a result, the electromagnetic shield is further improved.

  FIG. 7 is an exploded perspective view showing a state where the heat sink is attached to the conductive case of the duplexer of the above embodiment, and FIG. 8 is a perspective view thereof. That is, a conductive heat radiation block 13 made of metal or the like is attached to the outer surface of the conductive substrate 10. Thereby, the heat mainly generated in the transmission filter can be efficiently dissipated.

  Hereinafter, the operation of the duplexer of this embodiment will be described.

  In the duplexer of the present embodiment, the phase of the center frequency of the reception-side dielectric filter 21 is −10 ° to +10 in the reflection characteristics on the input / output common terminal 31 side (that is, the conductive pin 86 side) of the transmission-side dielectric filter 1. It is within the range of °, preferably within the range of -5 ° to + 5 °, more preferably within the range of -1 ° to + 1 °, ie substantially 0 °. Such phase characteristics appropriately set the resonance frequency of the first trap resonator 4 of the transmission-side dielectric filter 1, and furthermore, capacitive coupling between the first trap resonator 4 and the first input / output electrode 6. Can be performed by appropriately setting. The setting of the resonance frequency of the first trap resonator 4 or the setting of capacitive coupling between the first trap resonator 4 and the first input / output electrode 6 is performed by changing the shape of the patterned conductive film 4 ′ to, for example, conductive The film can be appropriately adjusted by partially peeling or partially adding the film.

  Similarly, the reflection characteristic on the input / output common terminal 31 side of the reception-side dielectric filter 21 (that is, the transmission line (coaxial cable) 30 connected to the reception-side dielectric filter 21 is the conductive pin 86 side of the transmission line). Reflection phase), the phase of the center frequency of the transmission-side dielectric filter 1 is in the range of -10 ° to + 10 °, preferably in the range of -5 ° to + 5 °, more preferably -1 ° to + 1 °. In other words, it is substantially 0 °. Such phase characteristics appropriately set the resonance frequency of the “4 correspondence” second trap resonator of the reception-side dielectric filter 21, and “6 correspondence” with the second trap resonator of “4 correspondence”. Can be performed by appropriately setting the capacitive coupling with the second input / output electrode. The setting of the resonance frequency of the second trap resonator or the setting of capacitive coupling between the second trap resonator and the second input / output electrode is performed by, for example, changing the shape of the conductive film having a pattern corresponding to “4 ′” The conductive film can be appropriately adjusted by partially peeling off or partially adding the conductive film.

  For example, it is assumed that the reception-side dielectric filter 21 has the characteristics shown in FIG. 9 when the “4′-compatible” patterned conductive film forms the first pattern. That is, the attenuation pole frequency of the “4 correspondence” second trap resonator is 2029 MHz (Mkr1), and the phase of the center frequency (Mkr3) of the transmission-side dielectric filter 1 is −15 in the reflection characteristic on the input / output common terminal side. ° (outside the range of -10 ° to + 10 °).

  Therefore, when the second pattern different from the first pattern is formed by partially peeling or partially adding the conductive film of the first pattern “4′-compatible”, it is shown in FIG. It will have the characteristics that are. That is, the attenuation pole frequency of the second trap resonator corresponding to “4” is 2045 MHz (Mkr1), and the phase of the center frequency (Mkr3) of the transmission-side dielectric filter 1 is + 5 ° in the reflection characteristic on the input / output common terminal side. (Within a range of −10 ° to + 10 °). Even in this case, as can be seen from the comparison between FIG. 9 and FIG. 10, the attenuation characteristics outside the passband are not impaired.

  The setting of the resonance frequency of the first trap resonator 4 of the transmission-side dielectric filter 1 and the setting of the capacitive coupling between the first trap resonator and the first input / output electrode 6 can be similarly performed.

  In this way, in the reflection characteristics on the input / output common terminal side of the transmission-side dielectric filter 1 and the reception-side dielectric filter 21, the phase of the center frequency of the reception-side dielectric filter 21 and the transmission-side dielectric filter 1 is set to 0 °, respectively. By being close, the length of the transmission line 30 is set to 1/4 or less of the wavelength corresponding to the higher one of the center frequency of the transmission-side dielectric filter 1 and the center frequency of the reception-side dielectric filter 21, and A connection portion between the first end portion of the transmission line 30 and the first input / output electrode 6 (or a connection portion between the second end portion of the transmission line 30 and the second input / output electrode corresponding to “6”) Even as an input / output common terminal, loss (loss) is small. As a result, a duplexer with a reduced number of parts and reduced size can be obtained by using only one transmission line 30.

  The length of the transmission line (coaxial cable) 30 is ¼ or less of the wavelength corresponding to the higher one of the center frequency of the transmission-side dielectric filter 1 and the center frequency of the reception-side dielectric filter 21 as described above. Thus, the minimum value that can be determined according to the dimensions and arrangement of the transmission-side dielectric filter 1 and the reception-side dielectric filter 21 can be obtained. In addition, the demultiplexing performance can be improved by performing the phase adjustment as described above.

  In the present invention, the first and second trap resonators that are capacitively coupled to the first and second input / output electrodes, respectively, have a function of improving the attenuation characteristics outside the passband of each dielectric filter. It has both the phase adjustment function in the above duplexer.

  In the above embodiment, the phase of the center frequency of the reception-side dielectric filter 21 and the transmission-side dielectric filter 1 in the reflection characteristics on the input / output common terminal side for both the transmission-side dielectric filter 1 and the reception-side dielectric filter 21. As a result, a high-performance duplexer with a higher demultiplexing function can be obtained. However, in the present invention, the phase adjustment may be performed for only one of the transmission-side dielectric filter 1 and the reception-side dielectric filter 21. In that case, it is possible to obtain a good demultiplexing performance although the performance is slightly inferior to the case where the phases are adjusted for both.

  In the above embodiment, the first dielectric filter 1 is a transmission filter and the second dielectric filter 21 is a reception filter. In the present invention, conversely, the first dielectric filter is a reception filter. In addition, the second dielectric filter 21 can be a transmission filter.

It is a perspective view which shows one Embodiment of the duplexer by this invention. It is a disassembled perspective view which shows the part of the 1st dielectric filter and 1st shield case of the duplexer of FIG. It is an expansion perspective view which shows the 1st dielectric filter of the duplexer of FIG. It is sectional drawing which shows the circumference | surroundings of the conductive pin in the duplexer of FIG. It is a perspective view which shows the state which accommodated the duplexer of FIG. 1 in the electroconductive case. It is a disassembled perspective view of the duplexer of FIG. It is a disassembled perspective view which shows the state which attached the heat sink to the electroconductive case of the duplexer of FIG. It is a perspective view which shows the state which attached the heat sink to the electroconductive case of the duplexer of FIG. It is a figure which shows the characteristic of a dielectric material filter. It is a figure which shows the characteristic of a dielectric material filter.

Explanation of symbols

1 First dielectric filter (transmission filter)
2 1st dielectric block 2a Dielectric block upper surface 2b Dielectric block lower surface 3A, 3B, 3C, 3D, 3E, 3F 1st 1/4 wavelength type dielectric resonator 3A ', 3B', 3C ', 3D ', 3E', 3F 'Patterned conductive film 4 First trap resonator 4' Patterned conductive film 5 Trap resonator 5 'Patterned conductive film 6 First input / output electrode 7 Electrode 8 First shield case 81 Opening 82 Tab 83 Spacing protrusion 84 Holding protrusion 86, 87 Conductive pin 86a Insulating glass body 86b Solder 21 Second dielectric filter (receiving filter)
22 Second dielectric block 28 Second shield case 30 Transmission line (coaxial cable)
31 Input / Output Common Terminal 32 Coaxial Cable 32 ′ Connector 33 Coaxial Cable 33 ′ Connector 34 Coaxial Cable 34 ′ Connector 10 Conductive Substrate 11 Conductive Side Wall Member 12 Conductive Cover Plate 13 Heat Dissipation Block

Claims (10)

A duplexer comprising a first dielectric filter, a second dielectric filter, and a transmission line for connecting them,
The first dielectric filter includes one of a plurality of first quarter wavelength dielectric resonators and the first quarter wavelength dielectric resonator in a first dielectric block. A first input / output electrode capacitively coupled to the first input / output electrode and a first trap resonator capacitively coupled to the first input / output electrode;
The second dielectric filter includes, in a second dielectric block, one of a plurality of second quarter wavelength type dielectric resonators and the second quarter wavelength type dielectric resonators. A second input / output electrode capacitively coupled to the second input / output electrode and a second trap resonator capacitively coupled to the second input / output electrode;
The transmission line has a first end connected to the first input / output electrode and a second end connected to the second input / output electrode, and the first end of the transmission line A duplexer characterized in that a connection portion with the first input / output electrode is an input / output common terminal. The resonance frequency of the first trap resonator is such that the phase of the center frequency of the second dielectric filter is −10 ° to + 10 ° in the reflection characteristic on the input / output common terminal side of the first dielectric filter. The duplexer according to claim 1, wherein the duplexer is set to be within a range. The capacitive coupling between the first trap resonator and the first input / output electrode is based on the center frequency of the second dielectric filter in the reflection characteristic on the input / output common terminal side of the first dielectric filter. The duplexer according to claim 2, wherein the phase is set to be within a range of −10 ° to + 10 °. The resonance frequency of the second trap resonator is such that the phase of the center frequency of the first dielectric filter is −10 ° to + 10 ° in the reflection characteristic on the input / output common terminal side of the second dielectric filter. The duplexer according to claim 1, wherein the duplexer is set to be within a range. The capacitive coupling between the second trap resonator and the second input / output electrode is based on the center frequency of the first dielectric filter in the reflection characteristic on the input / output common terminal side of the second dielectric filter. The duplexer according to claim 4, wherein the phase is set to be within a range of −10 ° to + 10 °. The length of the transmission line is ¼ or less of the wavelength corresponding to the higher one of the center frequency of the first dielectric filter and the center frequency of the second dielectric filter. The duplexer according to any one of claims 1 to 5. The first input / output electrode is made of a conductive film attached to the open end surface of the first dielectric block, and the second input / output electrode is made of a conductive film attached to the open end surface of the second dielectric block. The duplexer according to claim 1, comprising a film. Each of the first dielectric block and the second dielectric block has a rectangular parallelepiped shape and is attached with a short-circuit surface opposite to the open surface in contact with the surface of the conductive substrate. The duplexer according to claim 1, wherein the input / output electrodes and the second input / output electrodes are arranged in parallel so as to be positioned at corresponding end portions. A first shield case is attached so as to cover the open surface of the first dielectric block, and the first input / output electrode passes through the opening provided in the first shield case and the first shield case. A first conductive pin extending to the outside of one shield case is fixed;
A second shield case is attached so as to cover the open surface of the second dielectric block, and the second input / output electrode passes through the opening provided in the second shield case and the second shield case. A second conductive pin extending to the outside of the shield case is fixed,
The transmission line is disposed outside the first shield case and outside the second shield case, and the first end is connected to the first conductive pin, The duplexer according to claim 8, wherein a second end is connected to the second conductive pin, and the first conductive pin constitutes the input / output common terminal. The duplexer according to claim 9, wherein the transmission line is a coaxial cable.

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