CN-122026186-A - Insulating support structure of radio frequency connector and design method thereof

Abstract

The invention discloses an insulating support structure of a radio frequency connector and a design method thereof. By arranging annular grooves on two end surfaces of the insulating support, discontinuous capacitance of the stepped conductor structure is compensated, groove depth and support distance (A is more than or equal to 2D and A1 is more than or equal to D) are optimized by combining HFSS electromagnetic simulation, and excellent matching characteristics of VSWR (vertical seismic wave) within a DC-40GHz frequency band are achieved. Experiments show that the structure reduces the reflection coefficient of the 40GHz frequency band to-22.5 dB, remarkably improves the signal integrity, and is suitable for high-frequency scenes such as 5G millimeter wave communication, satellite Internet and the like.

Inventors

• SHI JIANZHOU
• YU BOWEN
• FENG HUI
• Ran Chenli
• TONG LICHAO
• ZHANG SHAOBO

Assignees

• 中国电子科技集团公司第五十四研究所

Dates

Publication Date

20260512

Application Date

20260213

Claims (3)

1. 1. The insulation support structure of the radio frequency connector comprises an insulation support and is characterized in that the insulation support is of an annular structure, annular grooves are formed in two end faces of the insulation support and used for compensating discontinuous capacitance of a stepped conductor structure, and the depth of the grooves is determined according to the following formula: ; Wherein: groove depth (mm); lambda: target band wavelength (mm); characteristic impedance (omega); ΔC, capacitance discontinuity (pF); dielectric material relative dielectric constant; Effective compensation area (mm 2) of the groove.
2. 2. The insulating support structure of a radio frequency connector according to claim 1, wherein the distance A between adjacent insulating supports is A2D or more, and the reference surface distance A1D or more, wherein D is the inner diameter of the outer conductor in mm, A is the distance between adjacent supports in mm, and A1 is the distance between the first support and the reference surface of the connector in mm.
3. 3. A method for designing an insulating support structure of a radio frequency connector, for designing an insulating support structure of a radio frequency connector according to any one of claims 1 to 2, comprising the steps of: Calculating an initial groove parameter based on a transmission line theory; Establishing an HFSS full-wave three-dimensional model, and setting adaptive grid encryption (lambda/10); determining an optimal combination of the groove depth and the supporting distance through parameter scanning; verification of DC-40GHz band the internal VSWR is less than or equal to 1.2.

Description

Insulating support structure of radio frequency connector and design method thereof Technical Field The invention relates to the technical field of radio frequency connectors, in particular to an insulating support structure of a radio frequency connector suitable for a 40GHz ultra-wideband frequency band and a design method thereof, and particularly aims at the problem of discontinuous impedance caused by insulating support in high-frequency signal transmission. Background The traditional radio frequency connector (such as 3.5mm/2.92 mm) has the following defects in the 40GHz frequency band: Impedance mismatch, namely, abrupt capacitance is generated at the contact position of the insulating support and the conductor step, so that the reflection coefficient Γ is more than or equal to 0.12 (corresponding to VSWR=1.8), and the signal-to-noise ratio of the system is affected; the prior single-order support structure is difficult to meet the DC-40GHz full-band matching requirement; the simulation dependence is low, the traditional design depends on an empirical formula, and multi-parameter joint optimization is not carried out by combining electromagnetic simulation. Disclosure of Invention The invention aims at providing a radio frequency connector insulation support structure suitable for a 40GHz ultra-wideband frequency band and a design method thereof, which remarkably reduce the problem of high-frequency band impedance mismatch. The invention is realized by the following technical scheme: the utility model provides an insulating bearing structure of radio frequency connector, includes insulating support, insulating support is annular structure, and sets up annular groove at insulating support both ends face for compensate the discontinuous electric capacity of echelonment conductor structure, the recess degree of depth is determined according to following formula: ; Wherein: groove depth (mm); Lambda: target band wavelength (mm); characteristic impedance (omega); ΔC, capacitance discontinuity (pF); dielectric material relative dielectric constant; Effective compensation area (mm 2) of the groove. Further, the distance A between adjacent insulating supports meets A not less than 2D, the reference surface distance meets A1 not less than D, D is the inner diameter of the outer conductor, the unit is mm, A is the distance between adjacent supports, the unit is mm, and A1 is the distance from the first support to the reference surface of the connector, and the unit is mm. The design method of the insulating support structure of the radio frequency connector is used for designing the insulating support structure of the radio frequency connector, and specifically comprises the following steps: Calculating an initial groove parameter based on a transmission line theory; Establishing an HFSS full-wave three-dimensional model, and setting adaptive grid encryption (lambda/10); determining an optimal combination of the groove depth and the supporting distance through parameter scanning; verification of DC-40GHz band the internal VSWR is less than or equal to 1.2. Compared with the prior art, the invention has the following beneficial effects: Introducing an annular groove into the end surface of an insulating support to form a local inductance compensation discontinuous capacitor; Parameter optimization, namely optimizing the depth of the groove and the supporting distance based on transmission line theory and HFSS electromagnetic simulation; the performance is improved, the VSWR of the 40GHz frequency band is not more than 1.2, and the reflection loss is reduced by 33% compared with the traditional structure. Drawings Fig. 1: the invention discloses an insulating support three-dimensional structure schematic diagram. FIG. 2 is an enlarged partial view of the annular groove. FIG. 3 is a schematic diagram of HFSS simulation model and grid division. FIG. 4 is a plot of the effect of groove depth on VSWR. Figure 5. The suppression effect of the support pitch on the higher order mode resonance is compared. In the figure, 1, an inner conductor, 2, an insulating support, 3, a pressing sleeve, 4, an annular groove outer diameter, 5, an annular groove inner diameter, 6, an inner conductor, 7, an air medium, 8 and a PEI insulating support. Detailed Description The structural design, simulation optimization and experimental verification of the present invention are described in detail below with reference to the accompanying drawings and specific embodiments. Specific design and processing of insulating support structures The material is selected from the materials and the structural dimensions, and the insulating support adopts Polyetherimide (PEI) with the relative dielectric constant epsilon r=3.0. The outer conductor inner diameter d=2.92 mm and the inner conductor diameter d=1.27 mm constitute a standard 2.92mm connector interface. The annular grooves are designed on the two end faces of the insulating support, the groove