CN107565211B - A wide-beam navigation antenna with broadband FSS structure and double S-shaped probe feeding - Google Patents

Abstract

The invention discloses a wide-beam navigation antenna adopting a wide-band FSS structure with staggered radial arrangement of split resonant rings and double S-shaped probe feeding, which can effectively widen antenna bandwidth and beam width, and expand application scenarios. The antenna includes a broadband FSS structure with split resonant rings staggered in radiation, a lampshade-shaped radiation structure, and a double S-shaped probe feeding structure. The two split resonant rings are evenly arranged on the upper surface of the dielectric substrate in a radial and staggered manner; the edge of the circular platform radiation surface is flush with the upper edge of the dielectric cylinder, and the lower edge is connected to the side of the metal cylinder with a wavy structure. The conical radiator Located inside the dielectric cylinder; four double S-shaped feed probes are evenly placed on the metal floor, and fed in sequence according to the phases of 0°, 90°, 180°, and 270°. The 3dB beamwidth of the antenna is widened by staggering the broadband FSS structure and the lampshade-shaped radiation structure of the split resonant ring; the antenna's working bandwidth is expanded by the double S-shaped probe feeding structure, and the application range of the antenna is enhanced.

Description

A Broadband FSS Structure Using Radiation Staggered Split Resonator Rings and Double S-shape Probe Needle-fed Wide Beam Navigation Antenna

technical field

The invention relates to the technical field of wide-bandwidth beam navigation antennas, in particular to a wide-band FSS structure adopting radiation staggered arrangement of split resonant rings and a wide-beam navigation antenna fed by double S-shaped probes.

Background technique

The wide-beam navigation antenna is an antenna mainly used for receiving satellite navigation signals. Good coverage is maintained within the range of 0° to 360° and elevation angles of 5° to 90°. In addition, the navigation antenna requires a wide 3dB beam width, high low elevation gain and a wide operating frequency band. Common microstrip antenna feed structure is simple, but affected by surface waves, low elevation gain is not high, 3dB beam width and antenna bandwidth are not wide enough, it is difficult to meet the requirements of satellite navigation. The broadband FSS structure with staggered radiating split resonator rings and the wide-beam navigation antenna fed by double S-shaped probes have wider antenna bandwidth, 3dB beam width and higher low-elevation angle gain.

According to the search results, in 2015, Liu Hongxi et al. applied the nested structure of the square split resonator ring to the end-fire Vivaldi antenna, which effectively improved the antenna gain in the C and X frequency bands. In 2015, Dau-Chyrh Chang et al. proposed a wide-bandwidth beam antenna fed by an oblique T-shaped probe. By adopting a 20° bending structure, the coupling between the coupling line and the circular patch on the top of the antenna is reduced, thereby achieving broadening purpose of beamwidth. In 2016, Hao Liu et al. applied FSS to Cassegrain reflector antennas to achieve wide beam radiation at certain frequencies.

Contents of the invention

The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a wide-beam navigation antenna that adopts a wide-band FSS structure with staggered radiating opening resonant rings, a lampshade radiating structure, and double S-shaped probe feeding. The 3dB beamwidth of the antenna is expanded, the working frequency band is expanded, and the low elevation gain is improved.

In order to achieve the above object, the technical solution adopted by the present invention is: a wide-beam navigation antenna with a wide-band FSS structure and double S-shaped probe feeding with staggered radiation arrangement of split resonator rings, including: The broadband FSS structure of the ring, the lampshade-shaped radiation structure and the double S-shaped probe feeding structure, in which:

The broadband FSS structure with split resonant rings staggered in radiation has: a dielectric substrate and 8 split resonant rings. Four split resonant rings with larger radii are located on the upper surface of the dielectric substrate, and they are symmetrically distributed at a distance of 90°; another four split resonant rings with smaller radii are arranged staggered inside the large ring to form a staggered radial arrangement structure . A dielectric substrate with a split resonant ring structure sits directly above the dielectric cylinder and is supported by a circular foam plate.

The lampshade-shaped radiation structure has: a conical metal radiator and a lampshade-shaped radiation surface. The conical metal radiator is located inside the dielectric cylinder; the lampshade-shaped radiating surface includes a conical radiating surface and a metal cylinder side with a wavy structure. The sides of the metal cylinders are connected to form a lampshade-shaped radiating surface structure.

The double S-shaped probe feeding structure has: four double S-shaped feeding probes, which are evenly placed on the metal floor, symmetrical about the center of the circle, and fed in sequence according to the phases of 0°, 90°, 180°, and 270°. The double S-shaped probe feed structure is located inside the dielectric cylinder and below the conical metal radiator. The probe support column is a metal cylinder, which is connected with the inner conductor of the coaxial line, and the outer conductor of the coaxial line is connected with the metal floor. Double S-shaped probes are connected end to end by two English letters "S".

Further, the broadband FSS structure of the split resonator ring with staggered radiation arrangement is a symmetrical structure with staggered radiation arrangement. Split resonant rings are divided into two types, each with four sizes. The openings of the four split resonant rings with larger radii face the center of the circle, and they are symmetrically distributed in pairs at a distance of 90°; the other four split resonant rings with smaller radii are arranged staggered inside the large ring to form a staggered radial arrangement structure. The two split resonant rings are on concentric circles with different radii, and the split resonant ring of the outer ring is arranged at the intersection of two adjacent split resonant rings adjacent to the inner ring in a staggered radial arrangement, which is conducive to widening the beam width of the antenna. The dielectric substrate with the split resonant ring is positioned directly above the dielectric cylinder and is supported by a circular foam plate.

Further, for the lampshade-shaped antenna radiation structure, the designed antenna radiation structure includes a conical metal radiator and a lampshade-shaped radiation surface structure. The conical metal radiator is located inside the dielectric cylinder, and the conical metal radiator is conducive to improving the gain of the antenna at low elevation angles. The lampshade-shaped radiating surface includes a circular frustum radiating surface and a metal cylinder side with a wavy structure. The edge of the wavy structure on the side of the metal cylinder is a cosine function curve. The upper edge of the radiating surface of the circular platform is flush with the upper edge of the dielectric cylinder, and the lower edge is connected with the side of the metal cylinder with a wave-shaped structure to form a lampshade-shaped radiating surface structure, which is conducive to further broadening the beam width of the antenna.

Further, the above adopts a double S-shaped probe structure, four double S-shaped feeding probes are evenly placed on the metal floor, and are symmetrical about the center of the circle, according to the phases of 0°, 90°, 180°, and 270° feed. The double S-shaped probe feed structure is located inside the dielectric cylinder and below the conical metal radiator. The probe support column is a metal cylinder, which is connected with the inner conductor of the coaxial line, and the outer conductor of the coaxial line is connected with the metal floor. The double S-shaped probes are connected end to end by two English letters "S", which effectively reduces the space length of the feeding probes and is conducive to the miniaturization of the antenna.

Compared with the prior art, the present invention has the following advantages:

(1) The present invention adopts a broadband FSS structure and a lampshade-shaped radiation structure with staggered radiating split resonant rings, and widens the antenna through new structures such as split resonant rings, conical radiators, and metal cylinder sides with wavy structures. 3dB beamwidth.

(2) The present invention adopts double S-shaped probes as the feeding structure. This double S-shaped probe structure not only improves the feeding efficiency, further widens the bandwidth, but also reduces the space length of the probes, which is conducive to miniaturization design .

Description of drawings

Fig. 1 is a schematic top view of an embodiment of the present invention;

Fig. 2 is a schematic side view of an embodiment of the present invention;

Fig. 3 is the internal plan view of the embodiment of the present invention;

Fig. 4 is the reflection coefficient simulation figure of the embodiment of the present invention;

Among them, reference signs:

101a: a split resonator ring with a larger radius;

101b: split resonator ring with smaller radius;

102: dielectric substrate;

103: medium cylinder;

104: frustum-shaped radiation surface;

105: metal floor;

201: Metal cylinder side with wavy structure;

202: conical metal radiator;

203: double S-shaped probe;

204: circular foam board;

205: coaxial cable;

206: Metal cylinder.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

As shown in FIG. 1 , a dielectric substrate 102 with a dielectric constant εr=2.2, a radius r=28mm, and a thickness h=0.5mm is selected as the substrate of the split resonator ring. On the upper surface of the dielectric substrate, there are 4 large opening resonant rings 101a with an outer radius of r=11.5mm and an inner radius of r=9.5mm, and the opening diameter is 7.5mm; there are four other large openings with an outer radius of r=2.5mm and an inner radius of r=1.5mm The small split resonant ring 101b has an opening diameter of 1 mm. The distance between the center of the large-aperture resonant ring 101a and the center of the dielectric substrate 102 is 16mm; the distance between the center of the small-aperture resonant ring 101b and the center of the dielectric substrate is 1.8mm, forming a radially staggered arrangement structure with the large-aperture resonant ring 101a. Directly below the dielectric substrate 102 is a circular foam board 204 with a radius of r=28mm and a height of h=3mm.

The radius of the upper bottom of the circular frustum radiating surface 104 is r=30mm, the radius of the lower bottom is r=45mm, and the height h=10mm. The dielectric cylinder 103 is a cylindrical material with a dielectric constant εr=3, a radius r=30mm, and a height h=20mm. The upper edge of the frustum radiating surface 104 is flush with the upper edge of the dielectric cylinder 103; the lower edge of the frustum radiating surface 104 is connected to the side surface 201 of the metal cylinder with a wavy structure. The side surface 201 of the metal cylinder with a wavy structure has a radius of r=45mm and a height of h=8mm, and its wavy structure is a cosine function curve with an amplitude of 3mm. The conical metal radiator 202 has a radius of r=29.5 mm and a height of h=3 mm. It is located inside the dielectric cylinder 103 and its apex is located directly below the center of the upper bottom of the dielectric cylinder 103 with a distance of 1.5 mm, as shown in FIG. 2 .

The double S-shaped probe 203 has a length of l=15.7mm, a width of w=1mm, and a thickness of h=1.3mm. Its side surface is a cosine function curve with an amplitude of 5mm and is located inside the medium 103. Its top view is shown in FIG. 3 . The metal cylinder 206 has a radius of r=0.65 mm and a height of h=11.97 mm, and is connected to the inner conductor of the coaxial line 205 , and the outer conductor of the coaxial line 205 is connected to the metal floor 105 . The metal floor 105 has a radius r=50mm and a thickness h=1.27mm.

As shown in FIG. 4 , it is a simulation data diagram of the reflection coefficient of a wide-beam navigation antenna using a wide-band FSS structure with staggered radiating split resonator rings and a wide-beam navigation antenna fed by double S-shaped probes according to an embodiment of the present invention. In addition, in the embodiment of the present invention, the bandwidth of the broadband FSS structure wide-bandwidth beam antenna adopting staggered arrangement of split resonant rings for radiation is 1.256GHz-1.85GHz, and the frequency bandwidth is 594MHz.

The embodiment of the present invention adopts a broadband FSS structure with staggered arrangement of split resonant rings and a wide-beam navigation antenna fed by double S-shaped probes. In the two-dimensional radiation direction at 1.268 GHz: 3dB beam width is 120°; 20° elevation gain 0.4dB, 5° elevation gain is -2.3dB.

The embodiment of the present invention adopts a broadband FSS structure with staggered arrangement of split resonant rings and a wide-beam navigation antenna fed by double S-shaped probes. In the two-dimensional radiation direction at 1.575 GHz: 3dB beam width is 80°, 20° elevation gain -2.38dB.

The embodiment of the present invention adopts a broadband FSS structure with staggered arrangement of split resonant rings and a wide-beam navigation antenna fed by double S-shaped probes. In the two-dimensional radiation direction at 1.605 GHz: the 3dB beam width is 100°, and the elevation angle gain is 20°. is -2.44dB.

Parts not described in detail in the present invention belong to the known techniques of those skilled in the art.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the protection scope of the claims of the present invention.

Claims (4)

1. A wide-beam navigation antenna that adopts a broadband FSS structure with staggered radiating split resonant rings and a double S-shaped probe feed, characterized in that: it includes three parts: a broadband FSS structure with staggered radiating split resonant rings , lampshade-shaped radiation structure and double S-shaped probe feeding structure, wherein: The broadband FSS structure with staggered arrangement of split resonant rings has: a dielectric substrate and 8 split resonant rings, four split resonant rings with larger radii are located on the upper surface of the dielectric substrate, and are symmetrically distributed at a distance of 90° from each other; another four Split resonant rings with smaller radii are arranged staggered inside the large ring to form a staggered radial arrangement structure. The dielectric substrate with the split resonant ring structure is located directly above the dielectric cylinder and is supported by a circular foam board; The lampshade-shaped radiation structure has: a conical metal radiator and a lampshade-shaped radiation surface, the conical metal radiator is located inside the medium cylinder; the lampshade-shaped radiation surface includes a circular table radiation surface and a metal cylinder side with a wave-shaped structure, and the circular table radiation surface The edge is flush with the upper edge of the medium cylinder, and the lower edge is connected with the side of the metal cylinder with a wave structure to form a lampshade-shaped radiation surface structure; The double S-shaped probe feeding structure has: four double S-shaped feeding probes, placed evenly on the metal floor, symmetrical about the center of the circle, feeding in sequence according to the phases of 0°, 90°, 180°, and 270°; The S-shaped probe feed structure is located inside the dielectric cylinder and below the conical metal radiator. The probe support column is a metal cylinder, which is connected to the inner conductor of the coaxial line, and the outer conductor of the coaxial line is connected to the metal floor. Double S-shaped The probe is connected end to end by two English letters "S". 2. According to claim 1, the broadband FSS structure and double S-shaped probe feeding wide-beam navigation antenna adopting radiation staggered arrangement of split resonator rings, is characterized in that: the broadband of said radiation staggered arrangement of split resonators The FSS structure is a symmetrical structure with staggered radiation. The split resonant rings are divided into two types, each with four types. Two split resonant rings with smaller radii are arranged staggered inside the large ring to form a staggered radiation structure; two split resonant rings are on concentric circles with different radii, and the outer ring split resonant rings are adjacent to the inner ring with two split resonators The junctions of the rings are staggered in radiation, which is beneficial to broaden the beam width of the antenna. The dielectric substrate with the split resonant ring is located directly above the dielectric cylinder and is supported by a circular foam board. 3. According to claim 1, the broadband FSS structure and the wide-beam navigation antenna fed by double S-shaped probes that adopt radiation staggered arrangement of split resonant rings according to claim 1 are characterized in that: the lampshade-shaped antenna radiation structure is designed The antenna radiation structure includes a conical metal radiator and a lampshade-shaped radiation surface structure. The conical metal radiator is located inside the dielectric cylinder. The conical metal radiator is conducive to improving the low elevation gain of the antenna. The side of the metal cylinder with a wavy structure, the edge of the wavy structure on the side of the metal cylinder is a cosine function curve, the upper edge of the radiating surface of the circular table is flush with the upper edge of the medium cylinder, and the lower edge is connected to the side of the metal cylinder with a wavy structure, The lampshade-shaped radiating surface structure is formed, which is beneficial to further broaden the beam width of the antenna. 4. According to claim 1, the broadband FSS structure and the wide-beam navigation antenna fed by double S-shaped probes using radiation staggered split resonator rings are characterized in that: the described structure adopts double S-shaped probes, Four double S-shaped feed probes are evenly placed on the metal floor, symmetrical about the center of the circle, and fed in sequence according to the phases of 0°, 90°, 180°, and 270°; the double S-shaped probe feed structure is located on the dielectric cylinder Inside, and below the conical metal radiator; the probe support column is a metal cylinder, which is connected to the inner conductor of the coaxial line, and the outer conductor of the coaxial line is connected to the metal floor; the double S-shaped probe consists of two English letters "S" The end-to-end connection effectively reduces the space length of the feeding probe, which is beneficial to the miniaturization of the antenna.