KR100269585B1 - Coupling loop direct junction type narrow band multi-channel combiner - Google Patents

Abstract

PURPOSE: A coupling loop direct junction type narrow band multi-channel combiner is provided to reduce insertion loss, manufacturing cost, a number of process and size of a combiner. CONSTITUTION: An upper surface and a lower surface of a combiner(100) are opened. A housing(1) is a metallic frame in which a plurality of partitions(3) are integrally formed. The plurality of partitions(3) divide the inside space to form a plurality of cavities(1a). A window(3a) is installed on the partition(3) to adjust an inductor and a capacitor and provide an electric wave path. A dividing plate(2) is mounted on a central portion of the partition(3) in a horizontal direction to separate each cavity(1a) into an upper space and a lower space. Each channel filter is comprised of three cavities in the horizontal direction. The separating plate(2) classifies the each channel filter. Four channel filters(60-63) (referred to as the first to the fourth channel filter) are provided in an inside of the housing(1).

Description

Coupling loop direct junction type narrow band multi-channel combiner}

The present invention relates to a coupling loop direct junction type narrow band multi-channel combiner combining a plurality of narrowband bandpass filters in a coupling loop direct connection.

Generally, a synthesizer is a device that combines several signals and transmits them with one antenna. Therefore, not only the number of cables installed to the antenna can be reduced by the combined number, but also the number of antennas in the upper space of the tower of the base station reduces the mutual interference or service dead zone.

In the current PCS mobile phone system, the development of the Linear Power Amplifier (LPA) method, which is superior to the High Power Amplifier (HPA) method, has been delayed, requiring a synthesizer for HPA.

The synthesizer using the HPA method is much larger than the synthesis method used in the LPA method, and the total system loss is large. Therefore, there is a demand for a product that can reduce the insertion loss and minimize the size of the HPA synthesizer.

Here, the conventional narrowband multi-channel synthesizer 500 will be briefly described with reference to FIGS. 1 to 5 as follows.

As shown in FIG. 1, the narrowband multi-channel synthesizer 500 includes a plurality of channel filters 110 to 140, a combined transmission line 180, and a combiner 200.

Each channel filter (which will be described herein with reference to the channel filter 110 as an example) is provided with a partition 113 for partitioning its interior into a plurality of cavities 110a through 110c, and a housing 111 made of a metal frame. , A cover 112 for shielding the upper opening surface of the housing 111, input and output connectors 150a and 150b mounted on both sides of the housing 111, and the input and output connectors 150a and 150b. A coupling loop 151a connected to a loop shape, a dielectric resonator 171 mounted to each cavity 110a to 110c of the housing 111, and a support for the dielectric resonator 171. The support teflon 172, the support teflon screw 170 for fixing the dielectric resonator 171 and the support teflon 172, and are coupled to the holes of each resonator while penetrating through the cover 112, Tuning screw 160 for adjusting the frequency and the coupling screw mounted on the side of the housing 111 The stream 161 and the windows 113a and 113b formed in the partition which partitions each cavity are provided.

In addition, a 50 ohm transmission line 180 is coupled to the output connector 150b of the channel filter, and the 50 ohm transmission line 180 is connected to one output connector 201. The combiner 200 is mounted.

The combiner 200 includes a conductor 202 connecting the center conductors 180a-1 to 180d-1 of each 50 ohm transmission line 180, and an output connector 201 connected to the conductor 202. The center conductor 201a of the () and the metal frame 203 surrounding all of them.

The electrical equivalent circuit of the conventional synthesizer 100 configured as described above is connected to the inductive coupling 151a-1 and the dielectric resonator by the coupling loop 151a connected to the input connector 150a-1, as shown in FIG. It consists of parallel LC coupling circuits (110a to 110c) formed by the inductive or capacitive coupling (113a, 113b) by the window.

Here, a high frequency signal is input to the input terminal 150a-1 and a current flows through the inductance 151a-1 generated by the input coupling loop 151a, so that a magnetic field is formed and the electromagnetic field is parallel LC by inductive coupling. The electromagnetic field transmitted to the resonator 110a and transmitted to the resonator is propagated to other parallel LC coupling circuits 110b and 110c by inductive or capacitive coupling 113a and 113b by a window to cause resonance, and then coupling again. The electromagnetic field induced by the loop 151b is output by the output connector 150b-1.

The output RF signal is transmitted to the connector 201 of the combiner 200 by a transmission line 180a connected to the output connector 150b-1.

As shown in FIG. 4, the transmitted RF signal has an impedance seen at the output terminal 150b-1 of the first channel filter 110 at the output terminals 150b-2 to 150b-4 of each channel filter 120 to 140. The RF signal is only output to the output connector 201 of the combiner 200 because it is open {electrically equals 1 / 4λ × n (n = 1,3,5,7, ...).

3 shows an equivalent circuit diagram of a transmission line 180 that is a component that provides a coupling.

The conventional synthesizer exhibits the characteristics as shown in FIG.

Insertion loss can be reduced and product size should be minimized in the configuration and operation as described above. As a method of combining several channel filters, the electrical length is 1 / 4λ × n (n = 1,3,5,7). , ...), so that when using a coaxial line (cable line or air type line), there is an increase in insertion loss, an increase in manufacturing process, an increase in production cost, and a relatively large size. In addition, in order to reduce the insertion loss, a high quality factor (Q) value of the dielectric resonator may be used or the size of the channel filter may be increased.

Accordingly, the present invention has been made to solve the above-mentioned problems, and in the method of combining several channel filters, the coaxial line (cable line or air type line) is removed and instead of each channel filter By using a coupling copper wire connected to the output side connector, the coupling amount is controlled and the electrical length is set to 1 / 4λ × n (n = 1,3,5,7, ...). The purpose of the present invention is to provide a coupling-diameter narrowband multichannel synthesizer that can compensate for the problem of increasing insertion loss, increasing production cost and process, and increasing size of synthesizer.

1 is a perspective view showing the configuration of a narrowband multi-channel synthesizer according to the prior art.

2 is an electrical equivalent circuit of FIG.

Figure 3 is a detailed view of the transmission line of Figure 2;

4 is an equivalent circuit diagram of a combined transmission line seen from the first channel filter.

5 is an electrical characteristic diagram of FIG.

Figure 6 is an exploded perspective view showing an embodiment configuration of a coupling loop direct narrowband multi-channel synthesizer according to the present invention.

7 is an electrical equivalent circuit of FIG.

8 is an equivalent circuit diagram of a coupling copper line seen from the first channel filter.

Figure 9 is an electrical characteristic diagram of Figure 6 and a comparison with the prior art.

Explanation of symbols on the main parts of the drawings

1: housing 1a: cavity

2: separator 3: partition

3a: window 16: dielectric resonator

17: support member 18: fixing screw

30 coupling screw 31 grounding screw

40a: upper cover 40b: lower cover

41: tuning screw 50: input connector

50a: washer 50b: set screw

51: output connector 51a: center conductor

52 to 55: coupling loop 56: short circuit prevention hole

60 to 63: first to fourth channel filters 71 to 74: coupling copper wire

100: synthesizer

The present invention for achieving the above object is provided with a plurality of partitions formed therein a window for adjusting the inductance and capacitance is partitioned into a plurality of cavities, upper and lower metal housings; A separation plate mounted to intersect the partition and partitioning each cavity of the housing into upper and lower spaces to form a predetermined number of channel filters in the housing; A plurality of input connectors mounted on one side of the housing and connected to cavities corresponding to the respective channel filters; A plurality of resonance generating means mounted in each cavity of the housing to generate resonance of the RF signal input through the input connector; A plurality of coupling means connected to each of the plurality of input connectors, the coupling means configured to flow a current as the RF signal is input to the input connector to form a magnetic field; A common output connector mounted on the other side of the housing and positioned at a center where the partition and the separator intersect to output an induced electromagnetic field; And a ground screw mounted through the housing wall on the output connector side, a central conductor connected to one side of the output connector to protrude into the housing, and one end connected to the ground screw and grounded. Has a plurality of coupling copper wires connected to the central conductor and having a predetermined length for adjusting the coupling amount, wherein the electromagnetic field propagated through the cavity of the coupling means, the resonance generating means and the housing is synthesized by inductive coupling. A coupling loop direct narrowband multichannel synthesizer including signal synthesizing means for outputting through a common output connector is provided.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 6 to 9.

Coupling loop direct narrowband multi-channel synthesizer according to the present invention is implemented to reduce the insertion loss and size, and to simplify the manufacturing process than in the prior art, as shown in Figure 6 synthesizer 100 in the present embodiment The upper and lower surfaces are open, and the housing 1 is formed of a metal frame body in which a plurality of partitions 3 are formed integrally to form an interior space into a plurality of cavities 1a. Here, the partition 3 is provided with a window 3a for providing a propagation path by adjusting an inductor and a capacitor, and in the middle portion of the partition 3, each cavity 1a is divided into upper and lower spaces. Separator plate 2 to be mounted in the horizontal direction to distinguish each channel filter consisting of three cavities in a horizontal row.

4 shows four channel filters 60 to 63 (hereinafter, referred to as "first to fourth channel filters") provided in the housing 1.

Each cavity 1a of the housing 1 is equipped with a dielectric resonator 16 for generating resonance, and a support member 17 made of Teflon material mounted thereon to support the dielectric resonator 16, and A fixing screw 18 made of Teflon is inserted into the hole of the dielectric resonator 16 and fixed thereto.

In this embodiment, the example using Teflon as the material of the support member 17 is shown, but is not limited to this, polycarbanite, other dielectrics of low dielectric constant and low loss may be used, and fixed Similarly for the screw 18, a low dielectric constant low loss dielectric may be used. In addition, the support member 17, the dielectric resonator 16, and the bottom or top surface of each cavity 1a may be bonded and fixed by using a ceramic bond without the fixing screw 18.

On one side of the housing 1, a plurality of input connectors 50 for inputting an RF signal from the outside are mounted by washers 50a and screws 50b, and the housings facing the input connector 50 are provided. On the other side, the joint output connector 51 for outputting the induced electromagnetic field is mounted.

Here, the plurality of input connectors 50 are mounted on one side of the housing 1, and are respectively mounted on four sides forming each cavity partitioned by the partition 3 and the separating plate 2, respectively. Coupling loops 52 to 55 are connected to the respective input connectors 50. In addition, the output connector 51 is mounted on the other side of the housing 1, and is located at the center where the partition 3 and the separator 2 intersect. The ground screw 31 which penetrates the housing 1 is provided in the center of the surface of the 1st-4th channel filter 60-63 which is the other direction of the said housing 1, and is provided in the edge part of the said ground screw 31. Coupling copper wires 71 to 74 are connected to the output connector 51. At this time, one end of the coupling copper wires 71 to 74 is connected to the ground screw 31 and grounded, and the other end of the coupling copper wires 71 to 74 is the center conductor 51a of the output connector 51. ) Are connected in a state of being soldered in common.

In addition, in order to prevent the coupling copper wires 71 to 74 from being short-circuited to the housing 1, a short-circuit prevention hole 56 having a predetermined size is formed at the intersection of the partition 3 on which the output connector 71 is mounted and the separator plate. ) Is formed.

In particular, the coupling copper wires 71 to 74 are coupled loops 52 in which RF signals inputted from the outside through the input connectors 50 of the first to fourth channel filters 60 to 63 are provided in the respective channel filters. 55 and the electromagnetic field propagated through the dielectric resonator 16 and the cavity 1a are synthesized by inductive coupling so that they can be output to the common output connector 51, wherein the coupling copper wires 71 to 74 are used. ) Are set to 1 / 4λ × n (n = 1,3,5,7, ...), respectively.

In addition, the washer 50a and the screw 50b for fixing each input connector 50 use the coupling loops 52 to 55 connected to the respective input connectors 50, and the characteristics of each channel filter and the total synthesizer 100. Adjust the coupling amount to the optimal position while rotating the coupling 360 ° according to the electrical characteristics of the) and then fix the input connector 50.

Meanwhile, the upper and lower opening surfaces of the housing 1 are shielded by upper and lower lids 40a and 40b, and the upper and lower lids 40a and 40b are coupled to each of the resonators 16 through the upper and lower lids 40a and 40b. A screw 41 is mounted to adjust the resonant frequency between the resonators 16. The tuning screw 41 in this embodiment has a structure in which a circular disk is integrally attached to the end in order to satisfy electrical characteristics.

A coupling screw 30 is mounted on the front and rear sides of the housing 1 to be coupled to the window 3a of the partition 3 to adjust the inductance and capacitance of the window 3a.

A coupling adjusting hole 42 having a predetermined size is formed on the upper and lower lids 40a and 40b covering the resonators 16 located in the channel filters 60 to 63 in the direction of the output connector 51. This is to adjust the electromagnetic field signals coupled to the output connector 51 by adjusting the respective coupling copper wires 71 to 74 through the coupling adjusting hole 42. At this time, after satisfying the electrical characteristics of the product through the coupling adjustment hole 42, the coupling adjustment hole 42 is attached by aluminum foil or copper foil piece to seal.

The equivalent circuit diagram of the present invention configured as described above is as shown in Figs. 7 to 8, which will be described below.

Since the operation characteristics of each of the channel filters 60 to 63 and the coupling copper wires 71 to 74 which are the coupling means are the same, the operation will be described with reference to the first channel filter 60.

First, when an external RF signal is input to the input connector 50, a current flows through the inductance 52-1 by the coupling loop 52 to form a magnetic field, and the electromagnetic field is formed by the inductive coupling of the magnetic field. It propagates to the first parallel LC circuit 60a-1 corresponding to one resonator 16. The second and third parallel LC circuits 60b-1, corresponding to the second resonator and the third resonator, are formed by the inductance or capacitance circuits 3a-1 and 3b-1 by the window 3a of the partition 3. Propagates up to 60c-1) to form an electromagnetic signal with narrow bandwidth electrical characteristics. This electromagnetic field signal is guided to the inductance 71-1 by the coupling copper wire 71 of the output terminal, and the induced electromagnetic field is output to the output terminal 51.

At this time, the electromagnetic field induced in the first coupling copper line 71 is ¼ to each of the coupling copper lines 72, 73, 74 and the output terminal 51 of the other second to fourth channel filters 61, 62, and 63, respectively. Although distributed, the electrical length of the coupling copper wires 71, 72, 73, 74 for adjusting the coupling amount is 1 / 4λ × n (n = 1,3, 5, 7, ... are set and adjusted so that the coupling copper wires 72, 73, 74, which are different in circuit, are all open and distributed, and all the electromagnetic fields that have been distributed are totally reflected back to the output terminal 51. Is output.

As a result, the electromagnetic field induced in the first coupling copper line 71 is theoretically output to the output terminal 51. However, in the actual product implementation, the electromagnetic field induced in the first coupling copper line 71 is used for the synthesizer 100 as a whole. Depending on the degree of impedance matching, the bandwidth width of each channel, and the degree of narrowness and wideness of the frequency intervals between the channels, the amount of induced leakage to the other coupling copper wires 72, 73, and 74 is generated. This part also appears as the insertion loss of the synthesizer 100.

According to the experiment of the present invention, the characteristics of the equivalent circuits of FIGS. 7 to 8 show the same characteristics as those of FIG. 5, and the characteristics of each channel filter 60 to 63 are shown in the graphs 60-1 to 63-1 of FIG. Is formed as follows.

9 shows a detailed comparison of the insertion loss of the conventional synthesizer B and the synthesizer A of the present invention, and shows that the insertion loss is reduced than that of the conventional synthesizer.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope of the technical idea of the present invention. It will be apparent to those of ordinary skill.

As described above, according to the present invention, a plurality of input connectors for inputting signals to each channel filter are installed on one side wall of the housing in which the plurality of channel filters are formed, and one common output connector is installed on the other side wall of the housing. The signal input to the plurality of input connectors is transmitted to the common output connector through the coupling copper wire, thereby achieving the effect of miniaturization of the device.

In addition, by using the coupling copper wire which controls the amount of coupling as a common part which simultaneously combines each channel, without taking the conventional coaxial line (cable line or air type line) coupling method which is a conventional synthesizer coupling system, Not only does it significantly reduce insertion loss, but it also reduces production materials, simplifies manufacturing processes, and reduces product size.

Claims (10)

A plurality of partitions having a window for adjusting inductance and capacitance formed therein and partitioned into a plurality of cavities, the upper and lower housings of which are open; A separation plate mounted to intersect the partition and partitioning each cavity of the housing into upper and lower spaces to form a predetermined number of channel filters in the housing; A plurality of input connectors mounted on one side of the housing and connected to cavities corresponding to the respective channel filters; A plurality of resonance generating means mounted in each cavity of the housing to generate resonance of the RF signal input through the input connector; A plurality of coupling means connected to each of the plurality of input connectors, the coupling means configured to flow a current as the RF signal is input to the input connector to form a magnetic field; A common output connector mounted on the other side of the housing and positioned at a center where the partition and the separator intersect to output an induced electromagnetic field; And A plurality of grounding screws penetrated through the housing wall of the output connector side, a central conductor connected to one side of the output connector to protrude into the housing, and one end of the grounding screw connected to the ground screw An end is provided with a plurality of coupling copper wires having a predetermined length connected to the center conductor to adjust the amount of coupling, by combining the electromagnetic field propagated through the cavity of the coupling means, the resonance generating means and the housing by induction coupling And a coupling loop direct narrowband multichannel synthesizer including signal synthesizing means for outputting through the common output connector. The method of claim 1, A pair of covers respectively shielding the upper and lower openings of the housing; And And a tuning screw coupled to the plurality of resonance generating means, respectively, penetrating through the lid and adjusting the resonance frequency between the resonance generating means. The method of claim 2, The coupling loop direct narrowband multi-channel synthesizer is provided integrally at the end of the tuning screw, further comprising a circular disk for satisfying the electrical characteristics of the synthesizer. The method according to any one of claims 1 to 3, And a coupling screw coupled to the window through the front and rear surfaces of the housing and configured to adjust the inductance and capacitance of the window formed in the partition. The method according to any one of claims 1 to 3, The coupling loop direct connection type further comprising a washer and a fixing screw for fixing the plurality of input connectors and adjusting the coupling amount to an optimum position by rotating the coupling amount 360 ° to match the characteristics of each channel filter and the electrical characteristics of the entire synthesizer. Narrowband multichannel synthesizer. The method of claim 1, And a short-circuit preventing hole of a predetermined size formed at an intersection of the partition on which the output connector is mounted and the separating plate so that the coupling copper line is not short-circuited to the housing. The method according to claim 1 or 6, And the coupling copper line has an electrical length of 1 / 4λ × n (n = 1, 3, 5, 7 ...), respectively. The method of claim 7, wherein The coupling loop direct narrowband multi-channel synthesizer is formed on one side of the cover, further comprising a coupling adjustment hole of a predetermined size to provide an adjustment space of each coupling copper wire. The method of claim 1, The resonance generating means, A dielectric resonator made of a coaxial resonator; Support means mounted to the lower portion of the dielectric resonator to support it; And A coupling loop direct narrowband multi-channel synthesizer including a fixing screw inserted into the hole of the dielectric resonator and fixing the same. The method of claim 9, The support means and the fixing screw coupling loop direct narrow-band multi-channel synthesizer formed of any one material of Teflon, polycarbanite and dielectric.

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