CN201266664Y

CN201266664Y - Embedded circulator for TD-SCDMA system

Info

Publication number: CN201266664Y
Application number: CNU2008201603716U
Authority: CN
Inventors: 陆敬文
Original assignee: Nanjing Guangshun Electronic Technology Institute
Current assignee: Nanjing Guangshun Electronic Technology Institute
Priority date: 2008-09-28
Filing date: 2008-09-28
Publication date: 2009-07-01
Anticipated expiration: 2018-09-28

Abstract

The utility model discloses an embedded circulator applied to TD-SCDMA system, which comprises a cavity and an inner conductor of the inner cavity. The circulator is characterized in that the inner conductor is clamped between an upper rotating magnetic ferrite and a lower rotating magnetic ferrite, three port leads of the inner conductor are led out of the cavity, the rotating magnetic ferrites and a permanent magnet are separated by a round magnetic conductive gasket, the permanent magnet and a temperature compensating alloy are stacked sequentially on the round magnetic conductive gasket, a magnetic circuit plate is arranged around the cavity, polyfluortetraethylene medium consists of 6 pieces of little polyfluortetraethylene medium and is arranged in the three port slots of the cavity, simultaneously the inner conductor is fixed in the middle of the cavity, an upper cover plate is glued on the cavity as an upper magnetic circuit plate, and an lower cover plate is fixed on the cavity as a lower magnetic circuit plate by screws. The embedded circulator applied to TD-SCDMA system has the advantages of easy assembling and lower assembling cost.

Description

The embedded circulator that is used for the TD-SCDMA system

Technical field

The utility model relates to the embedded circulator of a kind of TD-SCDMA of being used for system, belongs to the microwave ferrite technical field, mainly makes the composite device of sending and receiving letter machine in TD-SCDMA system base-station and mobile station system; The input of main rate of doing work amplifier, switching amplifier in transmitting and receiving system, output are isolated and play the decoupling effect in measuring systems.

Background technology

Fig. 1 is the fundamental diagram of isolator of the prior art; Fig. 2 is the fundamental diagram of three end junction circulators of the prior art.Isolator is a two-port device, and to output b, the energy attenuation of transmission is less from input a for signal, and signal then is high decay from output b to input a, is absorbed by the isolator load.The design concept of three desirable end junction circulators is based on scattering matrix theory, and collision matrix is set up the incident wave that finishes and the relation between the reflected wave.Three end junction circulators are made up of central area and three transmission lines that are coupled with it that a gyromagnetic ferrite loads, size, saturation magnetic moment, dielectric constant by changing gyromagnetic ferrite, the geomery that adds permanent magnetic field and center conductor change the eigenvalue of collision matrix, form circulator.For desirable three end junction circulators, the electromagnetic wave of c port input can only be exported from the d port; The electromagnetic wave of d port input can only be exported from the e port; And the electromagnetic wave of e port input can only be exported from the c port.Isolator is to extend from three-port circulator, just adds that at a port matched load (load of little reflection termination) forms.

Circulator and isolator can be made coaxial, little band, various ways such as band line, waveguide, are used for various electromagnetic transmission system.Fig. 3 is for adopting the duplex system fundamental diagram of circulator.Circulator and up band pass filter BPFa, descending band pass filter BPFb combination are used for emission-antenna-receiving system.This duplex system is the alien frequencies receive-transmit system, to be different from the same duplexer frequently of ATR in the Radar Technology.T is a transmitter among Fig. 3, and R is a receiver, and ANT is an antenna.

Existing circulator size is bigger, is about 25.4mm * 25.4mm * 12mm; Magnetic circuit is not exclusively closed, and leakage field is bigger, and anti-external interference ability is relatively poor, the bulk temperature poor-performing, and sealing, moisture resistance are bad; The inner wire port is straight draws cavity in circulator, exists certain height poor with installed surface, needs during installation on the PCB circuit board to be not easy to the installation on pcb board according to the overall dimension fluting of circulator.

The utility model content

The embedded circulator that is used for the TD-SCDMA system that technical problem to be solved in the utility model provides and a kind ofly is easy to assemble, assembly cost is lower;

Another technical problem to be solved in the utility model provides the stronger embedded circulator that is used for the TD-SCDMA system of a kind of anti-external interference ability.

For solving the problems of the technologies described above, the utility model provides the embedded circulator of a kind of TD-SCDMA of being used for system, comprise: the inner wire of cavity and inner chamber thereof, gyromagnetic ferrite, the magnetic conduction ring washer, permanent magnet, the temperature compensation alloy and the first magnetic circuit plate and the second magnetic circuit plate, PTFE medium, upper cover plate, lower cover reaches the fixedly screw of lower cover, it is characterized in that: described inner wire is sandwiched in up and down in the middle of the two-layer gyromagnetic ferrite, wherein three root ports of inner wire lead-in wire is introduced to outside the cavity, described magnetic conduction ring washer is separated gyromagnetic ferrite and permanent magnet, described permanent magnet, temperature compensation alloy overlays on the magnetic conduction ring washer successively, described magnetic circuit plate be centered around cavity around, described PTFE medium is made up of 6 little PTFE mediums, place three port flutings of cavity, and just in time inner wire is fixed in the middle of the cavity, described upper cover plate is glued on the cavity as last magnetic circuit plate, described lower cover as magnetic circuit plate down by screw on cavity.

The beneficial effect that the utility model reached:

Compared with prior art, the embedded circulator that is used for the TD-SCDMA system of the present utility model is owing to adopt Embedded overall structure, so be easy to assembling, assembly cost is lower.

And the embedded circulator total of the utility model TD-SCDMA system has adopted the shielding construction of complete closure magnetic circuit, leakage field is less, has guaranteed circulator shielding of interference signal and strengthened sealing, moisture resistance to external world under abominable operational environment.

Description of drawings

Fig. 1 is the fundamental diagram of isolator of the prior art;

Fig. 2 is the fundamental diagram of three end junction circulators of the prior art;

Fig. 3 is for adopting the duplex system fundamental diagram of circulator;

Fig. 4 is the structural representation of the embedded circulator of the utility model.

Embodiment

The embedded circulator of the TD-SCDMA of being used for of the present utility model system comprises: the inner wire 2 of cavity 1 and inner chamber thereof, gyromagnetic ferrite 3, magnetic conduction ring washer 4, permanent magnet 5, temperature compensation alloy 6 and the first magnetic circuit plate 7 and the second magnetic circuit plate 8, PTFE medium 9, upper cover plate 10, lower cover 11 and the fixing screw 12 of lower cover; It is characterized in that: described inner wire 2 is sandwiched in the middle of the up and down two-layer gyromagnetic ferrite 3, wherein three root ports of inner wire 2 lead-in wire is introduced to outside the cavity 1, described magnetic conduction ring washer 4 is separated gyromagnetic ferrite 3 and permanent magnet 5, described permanent magnet 5, temperature compensation alloy 6 overlays on the magnetic conduction ring washer 4 successively, the described first magnetic circuit plate 7 and the second magnetic circuit plate 8 be centered around cavity 1 around, described PTFE medium 9 is made up of 6 little PTFE mediums, place three port flutings of cavity 1, and just in time inner wire 2 is fixed in the middle of the cavity 1, described upper cover plate 10 is glued on the cavity 1 as last magnetic circuit plate, and described lower cover 11 conducts magnetic circuit plate down are fixed on the cavity 1 by screw 12.

As further improvement of the utility model, silver plating process is adopted on embedded circulator inner wire surface, to reduce the forward loss of circulator.Inner wire three root ports lead-in wire adopts the technology of bending, make three root ports lead-in wire parallel with the circulator baseplane, like this circulator just can directly make be screwed on the pcb board and with wire bonds in the corresponding circuit of pcb board, do not need on pcb board overall dimension fluting, be convenient to the installation on pcb board according to circulator.Inner wire adopts double-Y shaped inner wire pattern, and three ports of each Y type are evenly distributed by 120 °.

Temperature compensation alloy 6 is made up of three identical iron-nickel alloys described in the embedded circulator of the utility model TD-SCDMA system.

Cavity 1 is made by the aluminium alloy non-magnet material described in the embedded circulator of the utility model TD-SCDMA system.

High field region work is adopted in the selection of the embedded circulator yard of the utility model TD-SCDMA system.Usually in engineering design, during f＜600MHz, should adopt high field region work, during 600MHz＜f＜2000MHz, high and low field all can, f〉2000MHz is above should adopt low field to work.Characteristics at low circulator of working are: bandwidth is wide, and loss is little, but structure is bigger; Characteristics at the circulator of High-Field work are: volume is little, and to get the district wide but bandwidth is not as low field.Very narrow because of the TD-SCDMA band bandwidth, have only 15MHz, used we adopt the design of high field region work, much smaller than similar low place product, and can bear bigger power aspect volume.

The used gyromagnetic ferrite material selection of the embedded circulator of the utility model TD-SCDMA system has the garnet material of narrower resonance line width, and has adopted electroplate technology.Its advantage is that volume is little, and still has excellent temperature stability under lower saturation magnetization, has solved the little loss of circulator, the problem of wide temperature range work.

The embedded circulator total of the utility model TD-SCDMA system has adopted the shielding construction of complete closure magnetic circuit, and leakage field is less, has guaranteed circulator shielding of interference signal and strengthened sealing, moisture resistance to external world under abominable operational environment.

The embedded circulator externally-applied magnetic field of the utility model TD-SCDMA system adopts rare earth SmCo permanent magnet.Be that described permanent magnet 5 uses rare earth SmCo permanent magnets, samarium cobalt permanent magnet body temperature degree coefficient is little, and stable performance can be high temperature resistant, and under variations in temperature, it is less that its magnetic property varies with temperature influence, is the highest a kind of of combination property in the present all kinds of permanent magnet.Be used the trade mark 1J38 iron-nickel alloy samarium cobalt permanent magnet body is carried out temperature-compensating, guaranteed the stability that circulator is worked under-40～+ 85 ℃ of wide temperature.

Its monnolithic case of embedded circulator of the utility model TD-SCDMA system is of a size of 19.0mm * 19.0mm * 8.2mm.Its groundwork frequency range is 2010-2025MHz, and can expand to 1.7～2.5GHz frequency band any one section.

Protection range of the present utility model is not limited to the scope of specific embodiment, and the distortion that is no more than in the utility model thought range that described embodiment is made all belongs to protection range of the present utility model with application.

Claims

1, a kind of embedded circulator that is used for the TD-SCDMA system, comprise: the inner wire (2) of cavity (1) and inner chamber thereof, gyromagnetic ferrite (3), magnetic conduction ring washer (4), permanent magnet (5), the temperature compensation alloy (6) and the first magnetic circuit plate (7) and the second magnetic circuit plate (8), PTFE medium (9), upper cover plate (10), lower cover (11) reaches the fixedly screw of lower cover (12), it is characterized in that: two-layer gyromagnetic ferrite (3) was middle about described inner wire (2) was sandwiched in, wherein three root ports of inner wire (2) lead-in wire is introduced to outside the cavity (1), described magnetic conduction ring washer (4) is separated gyromagnetic ferrite (3) and permanent magnet (5), described permanent magnet (5), temperature compensation alloy (6) overlays on the magnetic conduction ring washer (4) successively, the described first magnetic circuit plate (7) and the second magnetic circuit plate (8) be centered around cavity (1) around, described PTFE medium (9) is made up of 6 little PTFE mediums, place three port flutings of cavity (1), and just in time inner wire (2) is fixed in the middle of the cavity (1), described upper cover plate (10) is glued on the cavity (1) as last magnetic circuit plate, and described lower cover (11) conduct magnetic circuit plate down is fixed on the cavity (1) by screw (12).

2, the embedded circulator that is used for the TD-SCDMA system according to claim 1, it is characterized in that: described inner wire (2) electroplate, described inner wire (2) three root ports lead-in wire adopts the technology of bending, make three root ports lead-in wire parallel with the circulator baseplane, described inner wire (2) adopts double-Y shaped inner wire pattern, and three ports of each Y type are evenly distributed by 120 °.

3, the embedded circulator that is used for the TD-SCDMA system according to claim 1 is characterized in that: described permanent magnet (5) is a rare earth SmCo permanent magnet.

4, the embedded circulator that is used for the TD-SCDMA system according to claim 1, it is characterized in that: described temperature compensation alloy (6) is made up of three identical iron-nickel alloys.

5, the embedded circulator that is used for the TD-SCDMA system according to claim 1, it is characterized in that: described cavity (1) is made by the aluminium alloy non-magnet material.

6, the embedded circulator that is used for the TD-SCDMA system according to claim 1, it is characterized in that: its monnolithic case is of a size of 19.0mm * 19.0mm * 8.2mm.