JPH03191619A - Shared transmission equipment - Google Patents

Abstract

PURPOSE:To further miniaturize a resonator used as a channel filter, and also, to miniaturize a whole shared transmission device containing a synthesis part, and to attain a low loss and a low cost by providing a TM mode dielectric resonator, etc. CONSTITUTION:A channel filter unit 100 is constituted of a metallic case 1 and eight TM mode dielectric resonators F1-F8 housed inside, and on the upper face of the resonators F1-F8, a signal input connector inserting hole Hi and a signal output connector inserting hole Ho are provided. Also, in the periphery of an opening part of the case 1, screw holes 2-13 for attaching a junction unit 101 are provided. Also, on the upper face of a ceramic substrate 16 of the unit 101, signal input connectors IN1-IN8 and a signal output connector OUT are provided, and on the upper face of the ceramic substrate 15, an electrode (branching line) 45 consisting of a transmission line is provided. In such a manner, by coupling and unifying the unit 100 and the unit 101, the whole equipment can be miniaturized, and its low loss and low cost can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a transmission sharing device that combines a plurality of transmission signals and transmits the combined signal to a common output line or antenna.

BACKGROUND OF THE INVENTION In recent years, cellular systems have come to be widely used in mobile communication systems such as car telephones using the 800 MHz band. In such a cellular system, the radius of a cell (wireless zone) and the wireless channel within the cell are set depending on the traffic.

In mobile communication systems such as the above-mentioned car telephones, where the number of users has been rapidly increasing recently, it has become necessary to reduce the cell radius and increase the number of base stations.

Along with this, the transmission sharing devices used in base stations are also required to be smaller in size, lower in loss, and lower in cost.

(C) Prior Art The transmission sharing device used in the above-mentioned base station mainly consists of a plurality of channel filters and a synthesizing section that synthesizes the output signals of these channel filters.

As a channel filter, a high Q resonator such as a cavity resonator or a semi-coaxial cavity resonator has conventionally been used. Furthermore, recently, high Q T E o Ia mode dielectric and electric resonators have been used, similar to cavity resonators and semi-coaxial cavity resonators, and the overall size has been reduced.

As the combining section, a combining circuit (so-called junction unit) using a coaxial cable or a waveguide is used, and by connecting this combining circuit to the output section of the resonator, the main part of the transmission shared device is configured.

(d1 Problem to be solved by the invention) However, even if a dielectric resonator is used as a channel filter, the overall transmission sharing device including the combining section is still large, and base stations with small cell radius It was unsuitable for use as a shared transmission device installed in

An object of the present invention is to provide a transmission/sharing device in which a resonator used as a channel filter is made smaller, and the entire transmission sharing device including a combining section is made smaller, has lower loss, and is lower in cost. It is in.

(e) Means for Solving the Problems The shared transmission device of the present invention includes an insertion hole for a signal input connector and an insertion hole for a signal output connector, and has a plurality of TM modes each passing a specific channel band. A channel filter unit in which dielectric resonators are arranged side by side with at least the insertion hole for the signal output coupler on the same surface, and a transmission unit in which the signal output coupler protrudes from the surface of the circuit board and the outputs of the signal output coupler are combined. The present invention is characterized by comprising a junction unit in which a branch line consisting of a line is formed on the circuit board, and the junction unit is coupled to a channel filter unit.

(f) Function The shared transmission device of the present invention is broadly divided into a channel filter unit and a junction unit. Each channel filter of the channel filter unit includes an insertion hole for a signal input connector and an insertion hole for a signal output connector, and each channel filter has a plurality of Ts that pass a band of a specific channel.
The channel filter unit is composed of M-mode dielectric resonators, and the channel filter unit is composed of a plurality of TM-mode dielectric resonators arranged in parallel with at least the insertion hole for the signal output coupler on the same plane. On the other hand, the junction unit has a signal output coupler protruding from the surface of a circuit board, and a branch line made of a transmission line for combining the outputs of the signal output coupler is formed on the circuit board.

A junction unit is coupled to the channel filter unit configured in this way to configure one transmission shared device.

When the transmission sharing device of the present invention is used as a transmission sharing device for a cellular base station, it is necessary to use a small dielectric resonator with a small power capacity because the transmission power has become relatively low as the cell radius has been reduced in recent years. can be used. Generally T M o lo and T M r +. TM mode dielectric resonators, such as The dielectric resonator is T
Q can be kept high compared to an E-mode dielectric resonator. Therefore, the channel filter unit is made smaller and has a lower insertion loss.

In addition, the Junk Silane unit is integrally formed with a signal output coupler that couples with the output of each dielectric resonator of the channel filter unit, so by integrating it with the channel filter unit, the entire transmission can be made more compact. Shared devices can be configured.

(Embodiment) The structure of a shared transmission device according to a first embodiment of the present invention is shown in FIGS. 1 to 6.

FIG. 1 is a perspective view of a channel filter unit and a junction unit separated from each other, and FIG. 2 is a perspective view of the entire transmission shared device in which both are integrated. In FIG. 1, 100 is a channel filter unit, and 101 is a junction unit. In the figure, the channel filter unit 100 consists of a box-shaped metal case 1 having an opening at the top, and eight TM mode dielectric resonators F1 to F8 housed inside the box-shaped metal case 1. These dielectric resonators F1 to F8 are composed of a metallized hexahedral ceramic cavity and a prismatic inner dielectric provided inside the hexahedral metallized ceramic cavity, as will be described later. The upper surface of each of the dielectric resonators F1 to F8 in the drawing is provided with a signal input coupler insertion hole and a signal output coupler insertion hole indicated by Hi and HO, respectively. Further, screw holes 2 to 13 for mounting the junction unit 101 are provided around the opening of the case 1.

The junction unit 101 shown in the figure mainly consists of two
It consists of two ceramic substrates, a branch line formed between the two ceramic substrates, a signal input connector, a signal output connector, an input/output connector, and the like. In the figure, reference numerals 15 and 16 each indicate a ceramic substrate, and eight signal input connectors indicated by INI to INB and one signal output connector indicated by OUT are attached to the upper surface in the figure. Further, holes 22 to 33 for screwing to the channel filter unit 100 are formed in the peripheral portion.

The channel filter unit 100 and the junction unit 101 are coupled together as shown in FIG.
A transmission sharing device for the channel is configured.

Next, the configuration of one dielectric resonator used in the channel filter unit is shown in FIGS. 3 and 4.

FIG. 3 is an exploded perspective view thereof. In the figure, 50 has a metallized outer surface and a prismatic inner dielectric 5 inside.
1 is an integrally molded ceramic body, 53.55 is a ceramic plate whose inner surface is metalized;
0 to form a ceramic cavity.

Note that round holes Hi and HO are formed in the upper surface of the ceramic body 50 into which signal input connectors and signal output connectors are inserted.

FIG. 4 is a central sectional view of one dielectric resonator after assembly. As shown in the figure, a shielded cavity is constituted by an electrode 52 formed on the outer surface of the ceramic body 50 and an electrode 54.56 formed on the inner surface of the ceramic plate 53.55, and this cavity and the internal dielectric TM due to the action of body 51. It operates as a mode dielectric resonator.

Next, the configuration of the junction unit is shown in Figures 5 and 6.
Shown in Figures (A) to (C).

FIG. 5 shows a branch line formed on the upper surface of the ceramic plate 15, especially a branch line consisting of a transmission line. The portion indicated by 45 in FIG. 0 is a so-called triplate type transmission line.

Figures 6 (A) to (C) are A-A and B-B shown in Figure 5.
FIG. 3 is a partial cross-sectional view of the entire junction unit taken along line C-C. FIG. 5A is a sectional view of a transmission line portion (A-A section in FIG. 5, etc.). The ceramic substrate 15 is formed by forming electrodes 41, 41 on the front and back surfaces of a ceramic plate 40, and the other ceramic substrate 16 is also formed by forming electrodes 43, 43 on the front and back surfaces of a ceramic plate 42. A groove is formed at a predetermined location on the ceramic substrate 15, and a dielectric 44 and an electrode 45 are formed on the upper surface of the dielectric 44 along the groove. This electrode 45 is the electrode 41 of the ceramic substrate 15.
Together with the electrode 43 of the ceramic substrate 16, a triplate type transmission line is constructed.

Figure 6(B) shows the part where the signal output connector is provided (
FIG. 5 is a sectional view taken along line BB in FIG. 5;

As shown in the figure, a through hole is formed in a predetermined location of the ceramic substrate 15, a coupling probe (signal output coupler) 17 is attached to the dielectric 44 and the electrode 45, and its tip protrudes from the lower part of the ceramic substrate 15. ing.

FIG. 6(C) is a sectional view of the output connector portion (section CC in FIG. 5). An opening is formed in the ceramic substrate 16 in this portion, and an output connector OUT is attached to the upper surface of the ceramic substrate 16, and its center conductor 18 is connected to the electrode 45.

In addition, a through hole is formed in the ceramic substrate 15, 16 at the mounting location of each input connector, and the center conductor of each human-powered connector is connected to the substrate 15 as a signal input connector such as a coupling probe or a coupling loop. protrudes to the bottom of the

By fixing the junction unit configured as above over the channel filter unit,
The coupling probe 17 protruding from the bottom of the junction unit is inserted into the signal output connector insertion hole of each dielectric resonator, and the center conductor of each signal input connector is inserted into the signal input connector insertion hole of each dielectric resonator. It will be inserted into the hole. Therefore, the signals of each channel input from the signal input connector are input to the corresponding dielectric resonators, and the signals generated at the signal output coupler are power-synthesized by the branch line 45 consisting of a transmission line and sent from the output connector OUT. Output.

The branch line shown in Fig. 5 connects each output of the dielectric resonator (equivalent short-circuit surface of the resonator) to the first branch point a or b.
The electrical length up to is set to be an odd multiple of 1/4 wavelength. Also, the second branch point from branch points a and b (the point where the center conductor of the output connector OUT is connected)
The electrical length is set to be an integral multiple of 1/2 wavelength. By configuring the branch line in this way, the impedance seen from each branch point to other dielectric resonators becomes extremely large at the frequency of the design wavelength, and the transmission power of the own channel is fed from the output connector with almost no loss. Ru.

FIG. 7(A) shows the configuration of the transmission sharing device according to the second embodiment.
, (B) to FIG. 9.

FIGS. 7(A) and 7(B) are external perspective views of the 32-channel transmission shared device, where (A) is a view seen from the signal input connector side, and (B) is a view seen from the signal output connector side. In both figures, IN1 to IN32 are signal input connectors, and 32 input connectors corresponding to the number of channels are arranged on the same surface. As shown in FIG. 3B, one output connector OUT is provided on the side opposite to the mounting surface of the plurality of input connectors. In addition, 60mm
．． A plurality of air cooling fans shown as 61, 62, 63, 64, etc. are attached.

FIG. 8 is a schematic plan view showing the structure of the main parts inside the transmission shared device, and FIG. 9 is a schematic cross-sectional view of the entire device as viewed from the line DD in FIG. In FIG. 8, F1 to F32 are
It is a 7M mode dielectric resonator that passes the band of each assigned channel. Also, JUa-JU
h is a junction unit in which a branch line consisting of a transmission line is formed on a substrate, and each unit combines four resonator outputs. For example, a junction knee'-
7 JUa is a resonator Fl, F3 . Each output of F9 and Fl is combined at point a. Further, for example, the junction unit JUh has a resonator F22. , F24, F30, and F32 are combined at point h. The outputs of these junction units are combined by branch lines JUI and JU2 made of coaxial cables, etc., and are supplied to circulators C1 and C2, respectively. Dummy loads R1 and R2 are connected to the circulators C1 and C2, respectively, and the outputs of the branch lines JUL and JU2 are combined and guided to the output connector OUT.

In addition, the electrical length of the branch lines of junction units JUa-JUh from each resonator to the branch point is 1/4.
It is set to an odd multiple of the wavelength.

Further, in the branch lines JUI and U2 that combine the outputs of each junction unit, the electrical length from the junction unit to the branch point '+J is set to be an integral multiple of 1/2 wavelength. By configuring the branch line in this way, the impedance seen from each branch point to other resonators becomes extremely large at the frequency of the design wavelength, and the transmission power of the own channel is fed to the circulators CI and C2 with almost no loss. be done. Similarly, the amount of coupling attenuation with other transmitters (circuits that supply transmission power to channel filters) also increases, and interference between transmitters decreases.

FIG. 9 shows the internal structure of the resonator F4. Here, 70 is a ceramic cavity, and 71 is a columnar internal dielectric integrally formed between the bottom and top surfaces of the cavity, thereby forming a 7M mode dielectric resonator. Reference numerals 72 and 73 are a signal input coupling loop and a signal output coupling loop for this resonator. Thirty-two channel filters having such a configuration are arranged and housed between metal plates (cases). In the same figure, IN
2. IN4. IN6 and IN8 are input connectors, respectively, 12.14. I6 and ■8 are isolators that supply signals from each input connector to the coupling loop of each resonator (channel filter). Moreover, JUb is the resonator F2. shown in FIG. This is a junction unit that combines the outputs of R4, FIO, and R12. JUd is the resonator F6. shown in FIG. F8. F14 and R16
This is a junction unit that combines the outputs of each.

By configuring as above, each input connector IN
Signals input from odd-numbered signal input connectors indicated by I--IN31 are power-combined by four junction units and coaxial cables, etc., and supplied to circulator C1, and then from even-numbered signal input connectors indicated by IN2-IN32. The input signals are power-combined by four junction units, coaxial cables, etc., and then supplied to the circulator C2. Half of the input power of the circulators C1 and C2 is absorbed by the dummy loads R2 and R1, respectively, and a composite signal is output from the output terminal OUT.
~67 suppresses the temperature rise of the dielectric resonators by directly cooling the cavities of the 32 dielectric resonators.

In particular, the air cooling fans 63 and 64 are dummy loads R1 and R2.
suppresses fever. Each dielectric resonator is in 7M mode, with the internal dielectric in direct contact between the two sides of the cavity (
The heat of the internal dielectric is efficiently dissipated from its surface through the cavity, and the temperature rise of the internal dielectric is small.

Therefore, frequency fluctuations are stabilized and insertion loss is reduced.

In the first and second embodiments, single-mode dielectric resonators were used as channel filters, but one multi-TM mode dielectric resonator could be used as a multi-stage channel filter, or a multi-channel filter. It may also be used as a channel filter.

(h1 Effects of the invention According to this invention, by using a 7M mode dielectric resonator as a channel filter, it is possible to reduce the size while having a relatively high Q, and furthermore, it is possible to reduce the size of the channel filter by using a branch line consisting of a transmission line. By integrating the junction unit provided with the signal output coupler with the channel filter unit, the overall size can be made smaller.In addition, since each channel filter is a 7M mode dielectric resonator, the heat dissipation efficiency is improved. high temperature, suppressing temperature rise.

Therefore, frequency fluctuations are small and insertion loss is also kept low. The transmission sharing device, which is thus reduced in size, loss, and cost, can be used as a base station of a cellular system with a reduced cell radius.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 to 6 are diagrams showing the configuration of a shared transmission device according to a first embodiment of the present invention, and FIG. 1 shows a structure in which a channel filter unit and a junction unit are separated. FIG. 2 is a perspective view when both are assembled. 3 and 4 are an exploded perspective view and a sectional view showing the structure of a dielectric resonator constituting one channel filter. 5 and 6 are a schematic plan view and a partial sectional view showing the structure of the junction unit. Further, FIGS. 7 to 9 are diagrams showing the configuration of a transmission sharing device according to a second embodiment of the present invention, and FIG. 7(A),
(B) is an external perspective view, and FIGS. 8 and 9 are a schematic plan view and a schematic sectional view. ■-Case, 15.16-Ceramic substrate, 17-Coupling probe (signal output coupler), 18-Center conductor, 45-Electrode (transmission line) (branch line), 50-Ceramic body, 51-Internal dielectric , 53.55-ceramic plate, 100-channel filter unit, 101, JUa
~JUh- Junction unit, IN-signal input connector, 0UT-signal output connector, ■-Isolator,

Claims (1)

[Claims] (1) A plurality of TMs each having an insertion hole for a signal input connector and an insertion hole for a signal output connector, each of which passes a specific channel band.
A channel filter unit in which mode dielectric resonators are arranged side by side with at least the insertion hole for the signal output coupler on the same surface, a signal output coupler protrudes from the surface of the circuit board, and the output of the signal output coupler is combined. 1. A transmission shared device comprising a junction unit in which a branch line consisting of a transmission line is configured on the circuit board, and the junction unit is coupled to a channel filter unit.