CN202352808U

CN202352808U - Microstrip double-knot isolator

Info

Publication number: CN202352808U
Application number: CN201120329712XU
Authority: CN
Inventors: 周鹏
Original assignee: Nanjing Guangshun Electronic Technology Institute
Current assignee: Nanjing Guangshun Electronic Technology Institute
Priority date: 2011-09-05
Filing date: 2011-09-05
Publication date: 2012-07-25
Anticipated expiration: 2021-09-05

Abstract

The utility model discloses a microstrip double-knot isolator used in the field of mobile communication. The microstrip double-knot isolator comprises two cavities, microwave ferrites, central conductors and the like, wherein each central conductor is clamped between two microwave ferrites; a high-frequency medium ring is sleeved at the periphery of each microwave ferrite; the microwave ferrites are fixed in the centers of the cavities; the diameter of each microwave ferrite is 14.7 mm; the diameter of the inner circle of each high-frequency medium ring is 14.7 mm, and the diameter of the outer circle of each high-frequency medium ring is 23.45 mm; the two cavities have the same configuration and are spliced in series with each other; a first lead of each central conductor is led to the outside of each cavity; a second lead of each central conductor is welded with a printed circuit board (PCB); and a third lead and a fourth lead of each central conductor are connected with two load sheets respectively. By adopting an integrated structure, the microstrip double-knot isolator has the characteristics of small volume, high magnetic loop closing degree, low magnetic leakage, high technical index and reliability, high isolation degree, high working stability at extreme temperature, high magnetic interference resistance and the like, and is easy to assemble.

Description

Little band binode isolator

Technical field

The utility model relates to field of mobile communication, relates in particular to a kind of little band binode isolator.

Background technology

Existing Embedded Double junction isolator structure is done shell with discrete permeability magnetic material, and permeability magnetic material is glued on the cavity with adhesive; Four ferrites of in the cavity of the left and right sides, packing into, center conductor, magnetic conduction disk; The magnetic conduction disk, temperature-compensating sheet, permanent magnet; Permeability magnetic material, permeability magnetic material is fixed on the cavity with screw respectively.Permanent magnet is that ferrite provides bias magnetic field, and center conductor has four to draw end points, is introduced to respectively outside four ports of cavity.This structure is fixed on the cavity with adhesive and screw by the polylith permeability magnetic material, constitutes magnetic loop with cavity.This structure processing consumptive material is big; Magnetic circuit is not exclusively closed, and leakage field is bigger, and magnetic circuit efficient is low; The device temperature poor-performing; Can not guarantee the stability of device work under the limiting temperature, guarantee under the situation of stable work in work that the volume of binode isolator also need dwindle to adapt to user demand as far as possible.

Fig. 3 is the isolator sketch map, and isolator is a two-port device, and to output (2), the energy attenuation of transmission is less from input (1) for signal, and signal then is high decay from output (2) to input (1), is absorbed by 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.

Fig. 4 is three end circulator sketch mapes; Three end circulators are made up of central area and three transmission lines that are coupled with it that a ferrite loads, through changing ferritic size, saturation magnetic moment; Dielectric constant; Add the geomery of permanent magnetic field and center conductor, thereby change the eigenvalue of collision matrix, form circulator.For desirable three end circulators, the electromagnetic wave of 1 port input can only be from the output of 2 ports, and the electromagnetic wave of 2 ports input can only be exported from 3 ports, and the electromagnetic wave of 3 ports input can only be exported from 1 port.Isolator is to extend from three-port circulator, adds at one end that just matched load (load of little reflection termination) forms.

Three end circulators and isolator can be made coaxial, little band, and the band line, various ways such as waveguide are used in the various electromagnetic transmission system.

Fig. 5 is the mixer sketch map, and two isolators and 90 ° of mixers that electric bridge is formed are two-in-one device.Also can make four unification mixers, it is made up of four isolators and three 90 ° of electric bridges.This mixer end 1 and hold 2 isolation must be greater than 50dB.

Fig. 6 is a power amplifier interstage matched sketch map, the coupling of power amplifier inter-stage and decoupling.In solid-state amplification system, the isolation between tandem formula amplifier stage is necessary, increases the stability of whole amplifier.

Fig. 7 eliminates the phase mutual interference between the emission source for eliminating the interference sketch map between emission source, and it also is to lump together use with several bank of filters.Similar with the effect of decoupling of above-mentioned inter-stage, difference is to be to eliminate alien frequencies to disturb here.

Fig. 8 is two-in-one antenna transmission systems sketch map, two-in-one antenna transmission systems.The emission source of two different frequencies forms through two circulators and two filter combinations.Also can become four unifications, ten six directions one, this is very useful in the honeycomb mobile communication base station.

Summary of the invention

The utility model technical problem to be solved provides a kind of simple in structure, and volume is little, is easy to assembling, debugging, little band binode isolator of stable work in work.

For solving the problems of the technologies described above, the utility model provides a kind of little band binode isolator, comprises cavity, microwave ferrite, center conductor, carrier sheet, even magnetic sheet, permanent magnet, pcb board and magnetic circuit plate; It is characterized in that: center conductor is clipped in the middle of two microwave ferrites, and shield blade, temperature-compensating sheet, permanent magnet and even magnetic sheet overlay on the microwave ferrite of center conductor top successively, and the magnetic circuit plate is fixed on the opening part of cavity as loam cake; Respectively overlap a high-frequency dielectric ring around the said microwave ferrite, microwave ferrite is fixed on the cavity center, the diameter of said microwave ferrite is 14.7mm; The ring inner ring diameter of said high-frequency dielectric ring is 14.7mm; The ring race diameter is 23.45mm, and said cavity has two, disposes identical; The series connection splicing; A lead-in wire of said center conductor is guided to outside the cavity, and second lead-in wire welds with pcb board mutually, and the 3rd links to each other with two carrier sheet respectively with the 4th lead-in wire.

Aforesaid little band binode isolator; It is characterized in that: said microwave ferrite is pure garnet 1800VT ferrite; Said high-frequency dielectric ring is the PTFE medium ring, and said permanent magnet is the samarium cobalt permanent magnet body, and said temperature-compensating sheet adopts dilval; The said first carrier sheet bearing power is 150W, and the said second carrier sheet bearing power is 10W.

Aforesaid little band binode isolator, it is characterized in that: said cavity is formed by magnetic conductive metal materials processings such as iron or steel, and cavity hatch place and magnetic circuit plate are processed to thread forms, and the magnetic circuit plate is along the cavity that is threaded at cavity hatch place.

The beneficial effect that the utility model reached is: volume was little after assembling was accomplished, and was convenient to assembling, and the magnetic circuit closure is good, and leakage field is little, and technical indicator and reliability are high, and isolation is high, good operating stability under the limiting temperature, and diamagnetic interference performance is strong.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the external form figure after the assembling of the utility model;

Fig. 3 is the isolator sketch map;

Fig. 4 is three end circulator sketch mapes;

Fig. 5 is the mixer sketch map;

Fig. 6 is a power amplifier interstage matched sketch map;

Fig. 7 is for eliminating the interference sketch map between emission source;

Fig. 8 is two-in-one antenna transmission systems sketch map.

Each code name explanation of letter in the accompanying drawing

ANT: antenna;

BPFa: up band pass filter;

BPFb: descending band pass filter;

Amp1: amplifier 1;

Amp2: amplifier 2;

BPF1: band pass filter 1;

BPF2: band pass filter 2;

BPFn: band pass filter n (expression has n band pass filter);

Tx1: transmitter 1;

Tx2: transmitter 2;

Txn: transmitter n (expression has n transmitter).

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

Like Fig. 1, Fig. 2, little band binode isolator of the utility model comprises: cavity 1, microwave ferrite 6, center conductor 7, carrier sheet 3,4, even magnetic sheet 8, permanent magnet 9, pcb board 2 and magnetic circuit plate 12; Center conductor 7, ferrite 6 have adopted electroplate technology, have effectively reduced the loss of device, and center conductor 7 is clipped in the middle of two microwave ferrites 6; Shield blade 11, temperature-compensating sheet 10, permanent magnet 9 and even magnetic sheet 8 overlay on the microwave ferrite 6 of center conductor 7 tops successively, and magnetic circuit plate 12 is fixed on the opening part of cavity 1 as loam cake, and cavity has two; Dispose identically, a high-frequency dielectric ring 5 is respectively overlapped in series connection splicing around the microwave ferrite 6; Microwave ferrite 6 is fixed on the cavity center; A lead-in wire of center conductor 7 is guided to outside the cavity 1, and second lead-in wire welds with pcb board 2 mutually, and the 3rd links to each other with two carrier sheet 3,4 respectively with the 4th lead-in wire; First of center conductor 7 and second lead-in wire are guided to outside the cavity 1, can directly link to each other with microstrip circuit.

Microwave ferrite 6 is pure garnet 1800VT ferrites, and diameter is 14.7mm, and high-frequency dielectric ring 5 is the PTFE medium ring; The ring inner ring diameter is 14.7mm, and the ring race diameter is 23.45mm, and permanent magnet 9 is the samarium cobalt rare earth permanent magnet body; And adopt iron-nickel alloy temperature-compensating sheet 10 to carry out adequate compensation; To improve job stability and the diamagnetic interference performance under the product limiting temperature, permanent magnet 9 longitudinal magnetization microwave ferrites 6 magnetize evenly.

Cavity 1 is formed by magnetic conductive metal materials processings such as iron or steel, and cavity hatch place and magnetic circuit plate 12 are processed to thread forms, and magnetic circuit plate 12 is threaded into cavity 1 along the cavity hatch place.

For achieving the above object, the yard of the little band binode of the utility model isolator is chosen in high field region.The normalization internal field guarantees the enough bandwidth in isolation strip when volume is little between 1.4～1.6.

The key technical indexes of the utility model such as following table:

Frequency range	1800-1885/1925-1995MHz
		Forward loss	≤0.5dB
Reverse loss	≥45dB
		Standing-wave ratio	SP1>26dB, SP2>21dB (SP1 under the limiting temperature>24dB)
Bearing power	150W,10W
		Temperature range	-10℃~+85℃
Direction	Oppositely
		Joint form	W→W
Overall dimension	50×45.5×10mm

The binode isolator of the utility model dwindles owing to having adopted integral structure, monnolithic case size to have significantly with respect to traditional little band binodal isolator, and the magnetic circuit closure is good; Leakage field is little; Technical indicator and reliability are high, are easy to assembling, and isolation is high; Good operating stability under the limiting temperature, characteristics such as diamagnetic interference performance is strong.

Above embodiment limits the utility model never in any form, every above embodiment is made with the equivalent transformation mode other improve and use, all belong to the protection range of the utility model.

Claims

1. little band binode isolator; Comprise: cavity (1), microwave ferrite (6), center conductor (7), carrier sheet (3,4), even magnetic sheet (8), permanent magnet (9), pcb board (2) and magnetic circuit plate (12) is characterized in that: center conductor (7) is clipped in the middle of two microwave ferrites (6), and shield blade (11), temperature-compensating sheet (10), permanent magnet (9) and even magnetic sheet (8) overlay on the microwave ferrite (6) of center conductor (7) top successively; Magnetic circuit plate (12) is fixed on the opening part of cavity (1) as loam cake; Said microwave ferrite (6) respectively overlaps a high-frequency dielectric ring (5) on every side, and microwave ferrite is fixed on cavity (1) center, and the diameter of said microwave ferrite (6) is 14.7mm; The ring inner ring diameter of said high-frequency dielectric ring (5) is 14.7mm; The ring race diameter is 23.45mm, and said cavity has two, disposes identical; The series connection splicing; A lead-in wire of said center conductor (7) is guided to outside the cavity (1), and second lead-in wire welds with pcb board (2) mutually, and the 3rd links to each other with two carrier sheet (3,4) respectively with the 4th lead-in wire.

2. little band binode isolator according to claim 1; It is characterized in that: said microwave ferrite (6) is pure garnet 1800VT ferrite; Said high-frequency dielectric ring (5) is the PTFE medium ring, and said permanent magnet (9) is the samarium cobalt permanent magnet body, and said temperature-compensating sheet (10) adopts dilval; Said first carrier sheet (3) bearing power is 150W, and said second carrier sheet load (4) power is 10W.

3. little band binode isolator according to claim 2; It is characterized in that: said cavity (1) is formed by iron or the materials processing of steel magnetic conductive metal; Cavity hatch place and magnetic circuit plate (12) are processed to thread forms, and magnetic circuit plate (12) is threaded into cavity (1) along the cavity hatch place.