CN105244231A - Single-pole triple-throw N-type high-frequency high-power RF coaxial relay - Google Patents

Abstract

The invention discloses a single-pole triple-throw N-type high-frequency high-power RF coaxial relay, which comprises N-type connectors, a microwave assembly, an electromagnetic system and a control circuit board, and is in the shape of a cylinder. The microwave assembly comprises cavity bodies, cavity covers, contact spring strips arranged at the upper parts of the cavity bodies, pushing rods extending out of the cavity covers, and springs arranged between the pushing rods and the lower ends of the cavity bodies. An upper push rod and a lower push rod of each pushing rod are matched with each other for fixedly installing the corresponding contact spring strip on the pushing rod. The four N-type connectors are installed at the lower ends of the cavity bodies in axial centrosymmetric distribution, each pushing rod is arranged between two adjacent N-type connectors, and upper ends of inner conductors of the two adjacent N-type connectors are aligned with both ends of the corresponding contact spring strip. Armatures of the electromagnetic system are in contact with the upper ends of the pushing rods, and a control circuit board is connected with the electromagnetic system. The operating frequency of the single-pole triple-throw N-type high-frequency high-power RF coaxial relay reaches 18GHz, and the RF power transmission capacity of the Single-pole triple-throw N-type high-frequency high-power RF coaxial relay is 100W at the temperature of minus 55DEG C and under the high altitude condition of height being 18,000 meters.

Description

SP3T N-type high-frequency high-power RF coaxial relay

Technical field

The present invention relates to N-type radio frequency coaxial relay field, particularly relate to a kind of SP3T N-type high-frequency high-power RF coaxial relay.

Background technology

N-type radio frequency coaxial relay Main Function is transmission and switches high-power RF signal, is components and parts very important in military systems engineering, also can be widely used in space communication, automatically test, communication system.According to theory calculate, the cut-off frequency of N-type radio frequency coaxial relay is generally 19GHz, general derate 10% ~ 15% in real product, if require its operating frequency 18GHz, reach critical value, not yet find that at present both at home and abroad operating frequency reaches 18GHz, simultaneously temperature be-55 DEG C, be highly 18000 meters of high altitude conditions under, RF power ability is the like product of 100W, and the highest of the operating frequency of same kind of products at abroad reaches 12.4GHz.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of SP3T N-type high-frequency high-power RF coaxial connector, and operating frequency is high, and radio frequency transmission power is large.

For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: provide a kind of SP3T N-type high-frequency high-power RF coaxial relay, comprise N Connector, microwave components, electromagnetic system, control circuit board, described radio-frequency (RF) coaxial relay is cylinder, microwave components comprises cavity, cover the chamber lid of cavity upper end, be in the contact spring on cavity top, stretch out the catch bar of chamber lid, be arranged on the spring between catch bar and cavity lower end, catch bar comprises upper push-rod, lower push-rod, upper push-rod matches with lower push-rod and is fixedly mounted on catch bar by contact spring,

Be that axle Central Symmetry distributing installation has four N Connectors in cavity lower end, catch bar is arranged between adjacent two N Connectors, N Connector comprises inner wire, outer conductor, insulator, shell, fixed by insulator between outer conductor and inner wire, and be filled with PTFE medium, shell is arranged between insulator and outer conductor, and the inner wire upper end of adjacent two N Connectors aims at the two ends of corresponding contact reed respectively;

Electromagnetic system comprises armature, iron core, coil around iron core, and armature contacts with catch bar upper end, and control circuit board is connected with the coil of electromagnetic system.

In a preferred embodiment of the present invention, the cavity of contact spring and microwave components forms rectangular coaxial transmission line structure.

Further, because contact spring needs to move up and down, between contact spring and the cavity of microwave components, air dielectric is filled with.

The invention has the beneficial effects as follows: operating frequency of the present invention is high, good electrical property, operating frequency is 6GHz ~ 18GHz, voltage standing wave(VSW)≤1.65, insertion loss≤0.65dB, isolation >=50dB; Radio frequency transmission power is large, and under low-temperature and low-pressure environment (temperature is-55 DEG C, is highly the high altitude conditions of 18000 meters), RF power ability is 200W@14GHz, 100W@18GHz; And reliable operation under low-temperature and low-pressure environment (temperature is-55 DEG C, is highly the high altitude conditions of 18000 meters).

Accompanying drawing explanation

Fig. 1 is the structural representation of SP3T N-type high-frequency high-power RF coaxial relay one of the present invention preferred embodiment;

Fig. 2 is the upward view of Fig. 1;

Fig. 3 is the structural representation of described microwave components and N Connector;

Fig. 4 is the sectional view of described rectangular coaxial transmission line structure;

Fig. 5 is the structural representation of described N Connector;

In accompanying drawing, the mark of each parts is as follows: 1, N Connector, and 11, inner wire, 12, outer conductor, 13, insulator, 14, shell, 2, microwave components, 21, cavity, 22, chamber lid, 23, contact spring, 24, catch bar, 241, upper push-rod, 2411, outer bulge loop, 242, lower push-rod, 2421, groove, 2422, bulge loop, 25, spring, 3, electromagnetic system, 31, armature, 32, coil, 4, control circuit board.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.

Refer to Fig. 1 and Fig. 2, the embodiment of the present invention comprises:

A kind of SP3T N-type high-frequency high-power RF coaxial relay, comprises N Connector 1, microwave components 2, electromagnetic system 3, control circuit board 4.Described radio-frequency (RF) coaxial relay is cylinder, and overall dimension is φ 76.2mm × 88.5mm.Microwave components 2 comprises cavity 21, cover the chamber of cavity 21 upper end lid 22, be in the contact spring 23 on cavity 21 top, stretch out the catch bar 24 of chamber lid 22, be arranged on spring 25 between catch bar 24 and cavity 21 lower surface.Composition graphs 3, cavity 21 is in cylindrical shape, be that the distribution of axle Central Symmetry has four stepped spliced eyes in cavity 21 lower end, each spliced eye is provided with a N Connector 1, have one between adjacent two spliced eyes and promote hole, promote permeate chamber lid 22 to cavity 21 lower surface, hole, promote, in hole, catch bar 24 is installed, spring 25, catch bar 24 comprises upper push-rod 241, lower push-rod 242, there is outer bulge loop 2411 upper push-rod 241 upper end, lower push-rod 242 upper surface has the groove 2421 coordinated with upper push-rod 241 bottom, the outer bulge loop 2411 of upper push-rod 241 stretches out chamber and covers 22 upper surfaces, between the bulge loop 2422 that spring 25 is against lower push-rod 242 bottom and the lower surface of cavity 21.Contact spring 23 is in flat rectangular-shaped, its length trend is axially consistent with the length of cavity 21, and contact spring 23 and cavity 21 together constitute rectangular coaxial transmission line structure, as shown in Figure 4, upper push-rod 241 matches with lower push-rod 242 and to be fixedly mounted on catch bar 24 by contact spring 23.

Refer to Fig. 5, N Connector 1 comprises inner wire 11, outer conductor 12, insulator 13, shell 14, fixed by insulator 13 between outer conductor 12 and inner wire 11, and be filled with PTFE medium, shell 14 is arranged between insulator 13 and outer conductor 12, and inner wire 11 upper end of adjacent two N Connectors 1 aims at the two ends of corresponding contact reed 23 respectively.

Electromagnetic system 3 comprises armature 31, iron core, coil 32 around iron core, and armature 31 contacts with catch bar 24 upper end, and control circuit board 4 is connected with the coil 32 of electromagnetic system 3, controls electromagnetic system 3 and is with moving armature 31 two ends to move up and down.

The operation principle of described SP3T N-type high-frequency high-power RF coaxial relay is: when control circuit board 4 applies rated voltage, control circuit works, coil 32 has electric current to pass through, its electromagnetic force produced makes armature 31 action, the outer bulge loop 2411 of upper push-rod 241 is promoted when armature 31 one end moves down, drive contact spring 23 action by catch bar 24, the radio-frequency channel that adjacent two N Connectors 1 are formed be closed, conducting, thus connect radiofrequency signal; When removing control voltage, operating state is contrary.On other direction, the radio-frequency channel operation principle of adjacent two N Connectors 1 as above.

The design principle of described SP3T N-type high-frequency high-power RF coaxial relay is described below:

In microwave components 2, the design of rectangular coaxial transmission line structure directly affects the electrical property technology of microwave components 2, and determines that the important parameter of rectangular coaxial line characteristic impedance is the dielectric constant of the width of contact spring 23 and cavity 21, thickness, dielectric thickness and material.Because contact spring 23 needs to move up and down, between the cavity 21 of contact spring 23 and microwave components 2, usually fill air dielectric.During calculating, reference rectangular coaxial line characteristic is (see table 1, wherein, w, t are respectively the length of contact spring and wide, and w ', b are respectively the length of cavity and wide, and ε r is the relative dielectric coefficient of medium) size of rectangular coaxial line cavity 21, contact spring 23 is tentatively determined by perfect condition.

Radiofrequency signal is the transmission mode again to coaxial line from coaxial line to strip line, in whole transmission, there is many places cross-sectional area of conductor sudden change and turn right angle, the discontinuous of impedance is inevitable, so the calculation of complex of rectangular coaxial transmission line, after tentatively determining relative dimensions, adopt HFSS software to carry out design of Simulation, draw optimal design size.

The characteristic impedance of N Connector 1 is determined by the outside dimension of outer conductor 12, inner wire 11 and insulator 13, and on each length cell of transmission line, characteristic impedance Zc should equal nominal value 50 Ω as far as possible, can be calculated by following formula to relative dimensions:

$z_c=\frac{377\mathrm{\Ω}}{2\mathrm{\π}\sqrt{{\mathrm{\ϵ}}_r}}\×ln\frac{D}{d}=\frac{60\mathrm{\Ω}}{\sqrt{{\mathrm{\ϵ}}_r}}\×ln\frac{D}{d}=\frac{138\mathrm{\Ω}}{\sqrt{{\mathrm{\ϵ}}_r}}\×log\frac{D}{d}---\left(1\right)$

In formula: d is inner wire diameter, D is outer conductor internal diameter, and ε r is the relative dielectric coefficient of medium, and the medium wherein between inner wire 11 and outer conductor 12 is polytetrafluoroethylene.Zc is 50 Ω, tentatively can be determined the size d=3.04mm of N Connector 1, D=7mm, ε r=1 by formula (1).

N Connector 1 cut-off frequency is that the characterisitic parameter of outer conductor 12 internal diameter, inner wire 11 external diameter and insulator 13 determines, can be calculated by following formula to relative dimensions:

$f_C=\frac{C_0}{{\mathrm{\λ}}_c}\≈\frac{2C_0}{\sqrt{{\mathrm{\ϵ}}_r}\mathrm{\π}(D+d)}\≈\frac{190.85}{\sqrt{{\mathrm{\ϵ}}_r}(D+d)}---\left(2\right)$

Wherein, C0 ≈ 300000km/s; λ c: wavelength, mm;

Through theory calculate, fc=19GHz, general derate 10%-15% in reality.

Product work is when 6GHz ~ 18GHz, and require the power capacity reaching 200W14GHz, 100W18GHz, power capacity mainly restricts by two factors: the maximum temperaturerise that the disruptive field intensity of medium itself and medium itself can bear.So resistance to powerful design is mainly select the higher material of disruptive field intensity, relative to the disruptive field intensity E of air dielectric from the viewpoint of two: one _br=3 × 10 ⁶v/m, the disruptive field intensity of polytetrafluoroethylene can reach E _br=12 × 10 ⁶v/m, adopts the higher polytetrafluoroethylene of disruptive field intensity as insulating supporting material, except it has excellent radio-frequency performance, also has higher fusing point, can improve through-put power significantly; Two is that radio-frequency channel will have good heat dispersion, when designing N Connector 1, installs metal shell 14 between insulator 13 and outer conductor 12, not only increases outer conductor 12 and the contact area of insulator 13, is more conducive to heat radiation, improves through-put power.

In addition, the metal parts in radio-frequency channel all adopts Beryllium-Bronze Heat Treatment, and gold-plated process is carried out on surface, and the reliability that enhancing contact spring 23 contacts with inner wire 11 and thermal diffusivity, can improve radio frequency electrical performance and radio frequency transmission power.

Operating frequency of the present invention is high, good electrical property, and operating frequency is 6GHz ~ 18GHz, voltage standing wave(VSW)≤1.65, insertion loss≤0.65dB, isolation >=50dB; Radio frequency transmission power is large, and under low-temperature and low-pressure environment (temperature is-55 DEG C, is highly the high altitude conditions of 18000 meters), RF power ability is 200W@14GHz, 100W@18GHz; And reliable operation under low-temperature and low-pressure environment (temperature is-55 DEG C, is highly the high altitude conditions of 18000 meters).

The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (3)

1. a SP3T N-type high-frequency high-power RF coaxial relay, comprise N Connector, microwave components, electromagnetic system, control circuit board, it is characterized in that, described radio-frequency (RF) coaxial relay is cylinder, microwave components comprises cavity, cover the chamber of cavity upper end lid, be in the contact spring on cavity top, stretch out the catch bar of chamber lid, be arranged on spring between catch bar and cavity lower end, catch bar comprises upper push-rod, lower push-rod, and upper push-rod matches with lower push-rod and is fixedly mounted on catch bar by contact spring;

Be that axle Central Symmetry distributing installation has four N Connectors in cavity lower end, catch bar is arranged between adjacent two N Connectors, N Connector comprises inner wire, outer conductor, insulator, shell, fixed by insulator between outer conductor and inner wire, and be filled with PTFE medium, shell is arranged between insulator and outer conductor, and the inner wire upper end of adjacent two N Connectors aims at the two ends of corresponding contact reed respectively;

Electromagnetic system comprises armature, iron core, coil around iron core, and armature contacts with catch bar upper end, and control circuit board is connected with the coil of electromagnetic system.

2. SP3T N-type high-frequency high-power RF coaxial relay according to claim 1, it is characterized in that, the cavity of contact spring and microwave components forms rectangular coaxial transmission line structure.

3. SP3T N-type high-frequency high-power RF coaxial relay according to claim 2, is characterized in that, be filled with air dielectric between contact spring and the cavity of microwave components.