Axial mode helical antenna with double-layer segmental medium lens

A technology of dielectric lens and helical antenna, which is applied to antennas, resonant antennas, antenna grounding devices, etc., can solve the problems of insignificant effect and complicated antenna fabrication, and achieve the effects of low manufacturing cost, easy mass production and simple structure.

Inactive Publication Date: 2013-05-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This invention is to solve the problem that when the number of coils of the existing helical antenna is too large, the effect of gain improvement is n

Method used

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  • Axial mode helical antenna with double-layer segmental medium lens
  • Axial mode helical antenna with double-layer segmental medium lens
  • Axial mode helical antenna with double-layer segmental medium lens

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specific Embodiment approach 1

[0007] Specific implementation mode one: combine Figure 1 to Figure 5 Describe this embodiment. The axial mode helical antenna loaded with a double-layer spherical dielectric lens in this embodiment includes a double-layer spherical dielectric lens 1, a helix 2, a microstrip impedance transformer floor 3 and a coaxial feeder 4. The double-spherical dielectric lens 1 is set above the upper end of the helix 2, the lower surface of the double-spherical dielectric lens 1 is a downwardly convex spherical surface, and the apex of the lower surface of the double-spherical dielectric lens 1 is far from the upper end of the helix 2 The end face distance h1 is 12mm, the lower end of the helix 2 is connected to the terminal of the microstrip metal strip on the microstrip impedance transformer floor 3, and the beginning end of the microstrip metal strip on the microstrip impedance transformer floor 3 is connected to the coaxial The inner conductor of the feeder 4 is connected, the centra...

specific Embodiment approach 2

[0011] Specific implementation mode two: combination figure 2 Describe this embodiment. The double-layer spherical dielectric lens 1 of the axial-mode helical antenna loaded with a double-layer spherical dielectric lens in this embodiment is composed of an outer layer dielectric sphere 1-1 and an inner layer dielectric sphere 1-2. , the outer dielectric ball 1-1 is set on the inner dielectric ball 1-2, and the center of the outer dielectric ball 1-1 coincides with the center of the inner dielectric ball 1-2.

[0012] The technical effect of this embodiment is: the two-layer dielectric ball lens realizes a gradually changing environment for electromagnetic wave propagation, can reduce the reflection of electromagnetic waves on the lens surface, and has a better effect of converging electromagnetic waves.

[0013] Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0014] Specific implementation mode three: combination figure 2 Describe this embodiment, the thickness h of the double-layer spherical dielectric lens 1 of the axial-mode helical antenna loaded with a double-layer spherical dielectric lens in this embodiment is 17.5 mm to 18.5 mm, and the outer dielectric sphere 1-1 The diameter d1 is 217mm ~ 219mm, and the relative dielectric constant ε of the medium of the outer dielectric ball 1-1 r1 = 2.25, the diameter d2 of the inner layer dielectric ball 1-2 is 190 mm to 192 mm, and the dielectric constant ε of the inner layer dielectric ball 1-2 r2 = 4.5.

[0015] The technical effect of this embodiment is: by reasonably selecting the lens size and the relative dielectric constant of the material, the impedance mismatch of the antenna caused by loading can be minimized, and the gain of the antenna can be effectively improved.

[0016] Other components and connections are the same as those in the first embodiment.

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Abstract

The invention relates to an axial mode helical antenna, particularly to an axial mode helical antenna with a double-layer segmental medium lens. The axial mode helical antenna with the double-layer segmental medium lens aims at solving the problem that when the coil number of an existing helical antenna is large, the enhancement effect of the gain is obvious, and the manufacture of the antenna can be complex. The double-layer segmental medium lens is arranged above the upper end of the helical antenna, and the lower surface of the double-layer segmental medium lens is a downward-convex spherical surface. The distance between the vertex of the lower surface of the double-layer segmental medium lens and the upper end surface of the helical antenna is 12mm, the lower end of the helical antenna is connected with the terminals of micro-strip line metal straps on a micro-strip impedance transformer floor, the tops of the micro-strip line metal straps on the micro-strip impedance transformer floor are connected with an inner conductor of a coaxial feeder line, the central axis of the helical antenna is perpendicular to the upper surface of the micro-strip impedance transformer floor, and the micro-strip metal straps are arranged on the micro-strip impedance transformer floor in a question mark shape. The axial mode helical antenna with the double-layer segmental medium lens is applicable to the radio field.

Description

technical field [0001] The invention relates to an axial mode helical antenna, in particular to an axial mode helical antenna loaded with a double-layer spherical segment dielectric lens. Background technique [0002] The helical antenna is a kind of antenna with a helical metal wire as the radiator. Due to the different shapes of the helical wire winding, it can be divided into cylindrical helix, elliptical cylindrical helix, conical helix and spherical helix, etc. The axial mode is the helical antenna. An important working mode, this mode mainly produces radiation along the helical axis, and the radiated electromagnetic wave is a circularly polarized wave, so it is widely used in satellite communication. Recently, with the development of mobile communication, in order to obtain a large range For stable WLAN coverage, axial mode helical antennas are also used as base station antennas. The input impedance of the helical antenna working in the axial mode is approximately a c...

Claims

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Application Information

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IPC IPC(8): H01Q1/36H01Q1/48H01Q9/27H01Q13/08H01Q15/02
Inventor 林澍王立娜张春雷张馨月张兴起王力卓
Owner HARBIN INST OF TECH
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