CN104638327A - SMA connector - Google Patents

Abstract

The invention relates to an SMA connector, and belongs to the technical field of connector assemblies. The SMA connector comprises an inner conductor, a shell and an insulator. The insulator is positioned between the inner conductor and the shell and is a circular ring, and through holes are formed in the circular ring along the axial directions of the circular ring. The SMA connector has the advantages that the through holes are formed in the insulator, a dielectric constant of dielectrics is equal to a dielectric constant of mixtures of air and polytetrafluoroethylene, a dielectric constant of the polytetrafluoroethylene is equal to 2.1, a dielectric constant of the air is 1, the dielectric constant of the mixtures of the air and the polytetrafluoroethylene is equal to 1.5, accordingly, the purpose of effectively supporting the mixed dielectrics can be achieved, the outer diameters and the dielectric constant of the dielectrics can be reduced, and usable frequency increasing effect can be realized; preferably, the six through holes are circumferentially uniformly formed in the insulator, the usable frequencies of the SMA connector can reach 18500MHz as shown by tests, and standing waves of the SMA connector are smaller than 1.25 (under DC-18000MHz conditions).

Description

SMA connector

Technical field

The invention belongs to connector art field, particularly relate to a kind of SMA connector.

Background technology

In microwave communication, lightning arrester technical field, SMA connector is a kind of widely used small-sized coaxial connector be threaded, and it has the advantages that bandwidth, performance are excellent, highly reliable and the life-span is long.SMA connector is applicable to microwave equipment and is connected radio frequency cable or microstrip line with in the loop of rf of digital communication system.The frequency of utilization of SMA connector is lower general at DC-13000MHz, and this is due to connector TEM mould upper limit operation frequency limitation.

Along with communication instructions for use improves constantly, client is also improving the requirement of SMA connector frequency of utilization.

Summary of the invention

For the deficiencies in the prior art, technical problem to be solved by this invention is, provides a kind of improve can the SMA connector of frequency of utilization.

The technical solution used in the present invention is, a kind of SMA connector comprises inner wire, shell and the insulator between inner wire, shell, and described insulator is torus, and has through hole along its axial direction on torus.

SMA connector of the present invention, takes to offer through hole on insulator, and dielectric permittivity is that air mixes with polytetrafluoroethylene, polytetrafluoroethylene dielectric constant=2.1; Dielectric constant of air is 1, dielectric constant=1.5 after mixing, adopts blending agent, has both met the object that medium effectively supports, and turn reduced medium external diameter and dielectric constant, thus reaches that improve can the beneficial effect of frequency of utilization.

Accompanying drawing explanation

Fig. 1 is SMA connector cross-sectional view of the present invention;

Fig. 2 is SMA connector insulator schematic cross-section of the present invention.

Embodiment

Below in conjunction with accompanying drawing the present invention made and further illustrating.

As shown in the figure, SMA connector of the present invention comprises shell 1, insulator 2 and inner wire 4, insulator is between inner wire, shell, insulator is torus, and has through hole 3 along its axial direction on torus, as preferably, number of openings is six, make circumference uniform distribution on insulator, dielectric permittivity is that air mixes with polytetrafluoroethylene, polytetrafluoroethylene dielectric constant=2.1; Dielectric constant of air is 1, dielectric constant=1.5 after mixing, adopts blending agent, has both met the object that medium effectively supports, and turn reduced medium external diameter and dielectric constant, thus reaches that improve can the beneficial effect of frequency of utilization.

The connector of perfect condition can be defined as the desirable air line in one end in theory, only be made up of outer conductor and inner wire, medium is vacuum.Internal and external conductor is desirable conductor, and namely conductivity is ∴ γ=∞; Medium is desirable medium, i.e. ρ=∞.

The frequency of its minimum high-rder mode TE11 is: f=190.8/{ medium dielectric is often/(d+D) } GHz

Common SMA connector: SMA connector after insulator internal diameter d=1.27mm improves: insulator internal diameter d=1.5mm

Insulator outer diameter D=4.1mm insulator outer diameter D=4.0mm

Dielectric permittivity=1.5, dielectric permittivity=2.1

Theoretical vacuum is without medium upper limit operation frequency f=190.8/{ dielectric permittivity (d+D) } GHz

Can effectively SC service ceiling operating frequency=80%* theoretical vacuum without medium upper limit operation frequency f.

SMA connector of the present invention, after tested can frequency of utilization to 18500MHz standing wave: be less than 1.25 (DC-18000MHz).

The description of above embodiment is comparatively concrete, detailed; but therefore can not be interpreted as the restriction to this patent scope; it should be noted that; for the person of ordinary skill of the art; without departing from the inventive concept of the premise; can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims (2)

1. a SMA connector, comprises inner wire, shell and the insulator between inner wire, shell, it is characterized in that: described insulator is torus, and have through hole along its axial direction on torus.

2. SMA connector according to claim 1, is characterized in that: described number of openings is six, makes circumference uniform distribution on insulator.