CN101859920A

CN101859920A - Eight-in-one automatic tuning cavity combiner

Info

Publication number: CN101859920A
Application number: CN200910106384A
Authority: CN
Inventors: 方超
Original assignee: SHENZHEN CITY SINTE TECHNOLOGY Co Ltd
Current assignee: SHENZHEN CITY SINTE TECHNOLOGY Co Ltd
Priority date: 2009-04-08
Filing date: 2009-04-08
Publication date: 2010-10-13

Abstract

The invention belongs to the technical fields of microwave communication and electronic information, and is suitable for the design and application of radio frequency front ends and combiner unit components of different communication systems. The eight-in-one automatic tuning cavity combiner consists of a radio frequency part, a control part, eight small-sized step motors 1-8, and four ports 24 respectively connected via coupling lines. The cavities of eight cavity filters are coupled via media, and the upper surface and the lower surface of the cavity are provided with eight input ports 9-16 and one output port 17 which are respectively provided with an N-shaped joint. Two tuning micro-controllers are arranged at the side surface of the cavity, a plurality of micro-processors are arranged inside, the side surface of each micro-controller is respectively provided with two control ports 18, four radio frequency interfaces 19, two control ports 20 and four radio frequency interfaces 21. The centers of the eight cavities are respectively provided with inner conductors, and a cover plate is arranged on the cavity via screws. With the technology, the loss and the cost are reduced, and simultaneously, the automatic tuning function is added, the anti-interference capacity is enhanced so as to make the use of the combiner more convenient and quicker, and the performance is superior.

Description

A kind of eight-in-one automatic tuning cavity combiner

Technical field

The invention belongs to microwave communication and electronic information technical field, be applicable to the design and the application of different communication system radio-frequency front-ends and radio frequency front ends.

Background technology

In microwave communication and electronic information, can use a large amount of mixers, be particularly useful for GSM, and 3G (contain WCDMA, TD-SCDMA, CDMA2000), DCS, the network of frequency ranges such as WLNA.Mixer has mixed electrical bridge to close the road at present, the Wilkinson power splitter, and the road is closed in cavity filtering and the base station carrier electric bridge closes multiple solutions such as road.The advantage that mixed electrical bridge closes the road is that cost is low, and the band limits that closes the road is wide, and its application at present is very extensive, can realize closing the road with frequency, but loss is bigger, and it is not too convenient to upgrade.The advantage of Wilkinson power splitter is that cost is low, and the band limits that closes the road is wide, uses very extensively, can realize that shortcoming is that loss is bigger with frequently closing the road, and power resistor damages easily.It is loss little (less than 1dB) that the road advantage is closed in cavity filtering, isolates, and the band limits that closes the road is wide, and shortcoming is to realize that bandwidth must be more than 1MHz with frequently closing the road, and cost is expensive with frequency combiner relatively.It is that the carrier frequency combination loss is big that the base station carrier electric bridge closes the problem that road (or power splitter closes the road) faces, the about 3.3dB of 2 carrier frequency combination losses, the about 5.1dB of 3 carrier frequency combination losses, 4 carrier frequency combination losses are greatly about 6.3dB, cause base station power output loss big, coverage reduces, and improves or enlarges the base station and cover the cost height.Comprehensive these several traditional mixers, mixed electrical bridge closes the road, and it all is that loss is bigger that Wilkinson power splitter and base station carrier electric bridge close the road, not energy-conservation, not environmental protection.Though and the loss of cavity mixer is little, cost is higher, and is uneconomical.Therefore not ideal enough in actual applications, desirability can better mixer.

Summary of the invention

To mention loss in the above-mentioned mixer big in order to overcome, and the shortcoming that cost is high the invention provides a kind of novel eight-in-one automatic tuning cavity combiner.It is little that this mixer has the loss of cavity mixer, isolates characteristics such as good, possesses mixed electrical bridge etc. simultaneously and close the low characteristics of road cost, reduced the research and development production cost to a certain extent preferably, and realized automatic tuning capabilities.

The technical solution adopted for the present invention to solve the technical problems is: a kind of eight-in-one automatic tuning cavity combiner specifically is divided into radio frequency part and control section, radio frequency part mainly is eight CF signal to be closed the road handle, control section mainly is to give microcontroller by the frequency of power detection module detection CF signal, microcontroller is judged and is relatively reached calculating then, running by the control motor at last realizes resonance, makes power output reach maximum.Mainly be configured to: eight small type stepping motor 1-8, four ports 24 that connect respectively through coupling line.Eight cavity filters by the media implementation coupling, have eight input port 9-16 and an output port 17 between each cavity in the top and bottom of cavity, be separately installed with N connector.Two tuning microcontrollers are installed in the side of cavity, and inside contains a plurality of microprocessors, and 18, four radio frequency interfaces 19 of two control ports and 20, four radio frequency interfaces 21 of two control ports are arranged respectively in each microcontroller side.Inner wire is installed at center at eight cavitys respectively, and cover plate is installed on the cavity by screw.

The invention has the beneficial effects as follows: a kind of eight-in-one automatic tuning cavity combiner adopts the dielectric filter path combining technique, eight road signals are closed the road, can provide good restraining outward, reduce antenna amount the transmitted passband band, prevent that extraneous signal from disturbing, and can also provide the standing-wave ratio detection port simultaneously.Each cavity filter input is all accepted transmitting from base station or direct discharging station sender as the input of mixer, the output of each cavity filter also inserts together as the output of mixer by coaxial cable, and each tuning controling unit all carries out tuning control to pairing cavity filter.The Insertion Loss of mixer is little, and the differential loss of the mixer that eight cavity filters are formed is less than 1dB, counts increase and does not have transition along with carrier frequency, changes little in other words.The utilance height of this mixer only needs N to close the road in the time of 3dB electric bridge mixer can not occurring, and in fact really need join N+1 situation (12 mixers are following) of closing the road, and mixer closes way, and to increase potentiality big.The single transmit antenna closes road carrier frequency number can reach 12 or more (realizing by the way of closing that increases single mixer), and the carrier frequency number can reach 24 even more when 2 secondary transmitting antennas used.The frequency of mixer has adjustability, and mixer is realized Tuning Control by changing tuning controling unit, and it is a close-loop feedback control loop in fact.When the carrier frequency of base station changes, detect the frequency of CF signal by power detection module and give microcontroller, microcontroller is judged and is relatively reached calculating then, the running by the control motor at last realizes resonance, makes power output reach maximum.Through reality test, this mixer closes output signal differential loss behind the road less than 1dB, is better than the performance index of like product.Automatic tuning is stable, and antijamming capability is strong, and the independent tuning working control of tuning motor is in 7s.Mixer by said structure is produced has well reduced production cost on the one hand, has well reduced loss on the other hand, and isolation is good, and more outstanding advantage is the function that has realized automatic tuning, has strengthened antijamming capability.This is a big technological innovation on traditional mixer basis.

Description of drawings

Fig. 1 represents the schematic diagram of eight cavitys of mixer radio frequency part

Fig. 2 represents the essential structure cell schematics of mixer control section

Fig. 3 represents the mixer motor, cavity, micro-control structure chart

Fig. 4 represents the power detection module schematic diagram

Embodiment

Fig. 1 represents the structure chart of eight cavitys of mixer radio frequency part.Eight carrier wave f1-f8 enter eight cavity filters respectively and are coupled as a carrier wave by medium, and send to antenna-feedback system.I/O control is regulated by stepping motor.The input of each cavity filter all as the input of mixer transmission from the transmitting of base station system sender, the output of each cavity filter is connected to together output as mixer by coaxial cable.

As shown in Figure 2, it is by external AC, power detection module, and microcontroller, five parts of motor drive module and cavity body filter constitute.Traditional mixer is to know carrier frequency by scanning, then the manual adjustments frequency make consistent with carrier frequency, thereby realize resonance.And this mixer is powered by external AC power supply, base station signal is given microcontroller by the frequency that power detection module detects CF signal, microcontroller is judged and is relatively reached calculating then, running by the control motor enters and feeds back to power detection module again after the cavity body filter filtering and realize resonance again, makes power output reach maximum.Thereby whole process mainly feeds back to power detection module realization automatic tuning capabilities by the running of stepping motor, need not manual adjustments.

Fig. 3 represents the unitary construction figure of mixer, and its feature comprises: hybrid motor part, diagram 1-8 represents eight small type stepping motors, four ports 24 in coupling line difference connection layout 4.The cavity part, the most right-hand and middle is the cavity schematic diagram among the figure, comprises eight cavity body filters altogether, divides top and bottom each four cavity body filter, is coupled by media implementation between each cavity; Have eight input port 9-16 and an output port 17 in the top and bottom of cavity, be separately installed with N connector, one front view in diagram 22 expression rectangle cavitys four sides, cavity be that a front view revolves respectively and turn 90 degrees four figures that obtain up and down.Two microcontrollers, be installed in the side of cavity, inside contains a plurality of microprocessors, mainly signal is judged, compare and calculating, this tuning controling unit all carries out tuning control to pairing cavity filter, in each microcontroller side two control ports 18 is arranged respectively, four radio frequency interfaces 19 and 20, four radio frequency interfaces 21 of two control ports.Inner wire, inner wire is installed at the center of the most right-hand in the drawings four cavitys respectively, this inner wire one end has screw thread, the other end is a hollow-core construction, inner wire is connected with stepping motor with counterbore by mounting screw, and the correct position and the number of turns of adjusting inner wire by the running of stepping motor realize resonance.Cover plate is installed on the cavity by mounting screw.

Fig. 4 represents the power detection module schematic diagram.Two signal input ports of 23 expressions among the figure, signal forward and reverse coupled are exported from illustrating 24 two ports, and tell two-way by 25 4 prevention at radio-frequency port of diagram, and diagram 26 is the control port of connection microcontroller.Being the sectional view of two-port 23 under among the figure, is the sectional view of port 24-26 directly among the figure, and diagram 27 is a port 23-24 place back view, and the most right-hand among the figure is the back view of whole module.Total plays the effect of power detection.

In a word, from above method as can be seen, technical scheme of the present invention makes the design of mixer more reasonable.Reduce the wastage and cost in, increased automatic tuning capabilities, strengthened antijamming capability, make the use of mixer more convenient, performance is more superior.

Claims

1. an eight-in-one automatic tuning cavity combiner is characterized in that: be divided into radio frequency part and control section, radio frequency part mainly is eight CF signal to be closed the road handle, control section mainly is to give microcontroller by the frequency of power detection module detection CF signal, microcontroller is judged and is relatively reached calculating then, running by the control motor at last realizes resonance, makes power output reach maximum.

2. a kind of eight-in-one automatic tuning cavity combiner according to claim 1 is characterized in that: eight small type stepping motor 1-8, four ports 24 that connect respectively through coupling line.Eight cavity filters by the media implementation coupling, have eight input port 9-16 and an output port 17 between each cavity in the top and bottom of cavity, be separately installed with N connector.Inner wire is installed at center at eight cavitys respectively.

3. a kind of eight-in-one automatic tuning cavity combiner according to claim 1 is characterized in that: described control section has four small type stepping motor 1-8, four ports 24 that connect respectively through coupling line.Two tuning microcontrollers are installed in the side of cavity, and inside contains a plurality of microprocessors, and 18, four radio frequency interfaces 19 of two control ports and 20, four radio frequency interfaces 21 of two control ports are arranged respectively in each microcontroller side.Cover plate is installed on the cavity by screw.

4. according to claim 1 and 3 described a kind of eight-in-one automatic tuning cavity combiners, it is characterized in that: power detection module comprises two signal input ports 23, signal forward and reverse coupled are from 24 outputs of two ports, and tell two-way, and by control port 26 monitoring that connect microcontroller by four prevention at radio-frequency port 25.