Antenna and communication equipment

Abstract

The invention provides an antenna and communication equipment, the antenna comprises two parallel conductor feeder lines and at least four oscillator units, the at least four oscillator units are arranged along the axis to form an oscillator array, and the conductor feeder lines coincide with the axis of the oscillator units; the conductor feeder line comprises a straight line section and a curve section, two adjacent oscillator units are connected through the straight line section or the curve section, one straight line section is connected between every two adjacent curve sections, or one curve section is connected between every two adjacent straight line sections. According to the antenna, the linear section and the curve section of the conductor feeder line are matched for use, so that the requirements of impedance matching and high gain of high and low frequency bands are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, in particular to an antenna and a communication device. BACKGROUND

[0002] The omnidirectional antenna is the most common type of antenna in the field of wireless communication. The omnidirectional antenna refers to an antenna with maximum radiation direction in the horizontal plane and uniform radiation in all directions, rather than an antenna with ideal spatial uniform radiation in all directions. Due to its omnidirectional nature, small size, low wind load and low cost, the omnidirectional antenna is commonly used in broadcast stations, cellular base stations, terminal devices, radio beacons and the like, especially terminal devices. Since the position of the terminal device changes relative to the fixed station at all times, when the omnidirectional antenna is used, the terminal device can communicate with the fixed station regardless of the position of the fixed station. According to the polarization mode, the omnidirectional antenna is divided into three types: vertical polarization (V-Pol), horizontal polarization (H-Pol) and circular polarization (CP). Among them, the basic radiation element of vertical polarization is dipole (symmetric vibrator), the horizontal polarization is Alford ring antenna, and the circular polarization is a combination of the two. Due to the horizontal 360° radiation, the directivity of the omnidirectional antenna is usually low, such as the directivity of the half-wave vibrator is 2.15dBi, and the directivity of the Alford ring antenna is 1-2dBi. Low directivity will result in small signal coverage, low signal-to-noise ratio and poor communication quality. In summary, in the engineering field, there is a strong application demand for omnidirectional antennas with multiple frequency bands, wide frequency bands, high gain and multiple polarizations.

[0003] The high directivity omnidirectional antenna in the prior art can at most form a two-element array when implementing double-frequency operation with a large interval, and the peak directivity Dp is only 3-5dBi, which is difficult to further improve the directivity by increasing the number of array elements. In theory, the more the number of array elements, the higher the directivity of the array. However, as the number of array elements increases, the length of the feed line becomes longer and longer, and it is difficult to ensure consistency of the current distribution on each array element at the same frequency, and the difference in current distribution between high and low frequencies of the array is even greater, making it difficult to simultaneously achieve double-frequency high directivity. SUMMARY

[0004] In order to solve at least one problem existing in the prior art, the present application provides an antenna and a communication device.

[0005] The present application provides an antenna, comprising two parallel conductor feed lines and at least four vibrator units, the at least four vibrator units are arranged along an axis to form a vibrator array, and the conductor feed lines coincide with the axis of the vibrator units.

[0006] The conductor feed line comprises a straight line segment and a curved line segment, two adjacent vibrator units are connected by the straight line segment or the curved line segment, and one straight line segment is connected between every two adjacent curved line segments, or one curved line segment is connected between every two adjacent straight line segments.

[0007] Optionally, the curved segment is a corrugated line.

[0008] Optionally, the corrugated line is formed by periodically arraying a meandering unit along an axis of the vibrator unit, the meandering unit comprising a straight segment, a first circular arc segment and a second circular arc segment, the straight segment being connected with one end of the first circular arc segment, the straight segment coinciding with the axis of the vibrator unit; the other end of the first circular arc segment being connected with the second circular arc segment, the first circular arc segment and the second circular arc segment being located on two sides of the axis of the vibrator unit respectively.

[0009] Optionally, the straight segment extends from one end of the first circular arc segment to the other end of the first circular arc segment, and a gap is provided between the straight segment and the first circular arc segment.

[0010] Optionally, the first circular arc segment and the second circular arc segment have the same diameter.

[0011] Optionally, the length of the straight segment is 1 / 2 of the corresponding chord length of the first circular arc segment.

[0012] Optionally, the first circular arc segment and the second circular arc segment are semicircular arcs.

[0013] Optionally, the meandering unit has a period number of 8-16.

[0014] Optionally, the antenna further comprises a substrate, each of the vibrator units comprises a vibrator upper arm and a vibrator lower arm, the vibrator upper arm of the vibrator unit is arranged on an upper surface of the substrate, the vibrator lower arm of the vibrator unit is arranged on a lower surface of the substrate, and the vibrator upper arm and the vibrator lower arm are connected as a whole by the two conductor feed lines.

[0015] Optionally, the antenna further comprises two direct current short circuit resistors, the two direct current short circuit resistors are arranged between two adjacent vibrator units; two through holes are arranged on the substrate, the two through holes are arranged between the two adjacent vibrator units.

[0016] The direct current short circuit resistor is connected between the vibrator upper arm and the vibrator lower arm of the adjacent vibrator unit.

[0017] Optionally, the two direct current short circuit resistors are located in the middle part of the vibrator array.

[0018] Optionally, the upper arm and the lower arm of the vibrator each comprise a horizontal segment, two first conductor branches and two second conductor branches, the two second conductor branches being arranged between the two first conductor branches, the length of the first conductor branches being greater than the length of the second conductor branches; one end of the two first conductor branches and the two second conductor branches is connected with the horizontal segment respectively.

[0019] Optionally, the distance between the first conductor branch and the adjacent second conductor branch is n, 0 < n < 2 mm.

[0020] Optionally, the length ratio of the first conductor branch and the second conductor branch is 2.0-2.5.

[0021] Optionally, the distance between the two adjacent vibrator units is D = (0.35-0.45) * λ, λ being the central wavelength under the frequency of 2.45 GHz.

[0022] Optionally, the thickness of the substrate is 0.75-1.5 mm, and / or the dielectric constant of the substrate is 2-4.

[0023] Optionally, the antenna further comprises a center feeding point, the center feeding point being located at the midpoint of the conductor feeding line.

[0024] Optionally, the antenna further comprises a radome, the radome being sleeved on the outer periphery of the substrate.

[0025] Optionally, the central axis of the radome coincides with the axis of the vibrator unit.

[0026] Optionally, the thickness of the radome is 2-3 mm.

[0027] Optionally, the dielectric constant of the radome material is 3.5-4.5.

[0028] In another aspect, the present application further provides a communication device comprising the antenna as claimed in any one of the above.

[0029] In the present application, on the one hand, by the combination of the straight section and the curved section of the conductor feed line, the impedance matching and high gain requirements of high and low frequency bands are considered. By setting the curved section, the total length of the conductor feed line is increased to more than the total length of the vibrator unit, the electrical length of the low frequency is increased, the consistency of the current distribution between the array elements of high and low frequencies is improved, thereby realizing three-frequency high directivity, further expanding the number of vibrator units from at least two to at least four, and realizing multi-frequency and high-gain omnidirectional radiation. On the other hand, by setting the combination of the straight section and the curved section of the conductor feed line, and connecting at least four vibrator units, the antenna of the present application has high gain while being small in size, and has the characteristics of compact structure, easy processing and low cost compared with the conventional four-element array. When using the antenna of the present application to construct an array with higher gain, the design of the feed network is simpler due to the structure of the conductor feed line. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic diagram of an antenna provided by an embodiment of the present application;

[0031] Figure 2 is a structural schematic diagram of the upper surface of a substrate of an antenna provided by an embodiment of the present application;

[0032] Figure 3 is a partial enlarged schematic diagram of a substrate of an antenna provided by an embodiment of the present application;

[0033] Figure 4 is a structural schematic diagram of a curved section of a conductor feed line of an antenna provided by an embodiment of the present application;

[0034] Figure 5 is a Smith chart of an antenna provided by an embodiment of the present application;

[0035] Figure 6 is a reflection coefficient |S 21 curve provided by an embodiment of the present application;

[0036] Figure 7 is a voltage standing wave ratio (VSWR) curve of an antenna provided by an embodiment of the present application;

[0037] Figure 8 is a peak directivity curve of an antenna provided by an embodiment of the present application;

[0038] Figure 9 is a horizontal plane non-circularity curve of an antenna provided by an embodiment of the present application;

[0039] Figure 10 is a vertical plane half-power beamwidth (HPBW) characteristic curve of an antenna provided by an embodiment of the present application;

[0040] Figure 11 is an E-plane and H-plane pattern of an antenna in the present application in the range of f1=2.3~2.5GHz, the solid line represents 2.3GHz, the dotted line represents 2.5GHz; the smooth line is the horizontal plane, H-plane; the dash-dot line is the vertical plane, E-plane;

[0041] Figure 12 is an E-plane and H-plane pattern of an antenna in the present application in the range of f2=3.8GHz, the smooth line is the horizontal plane, H-plane; the dash-dot line is the vertical plane, E-plane;

[0042] Figure 13 is an E-plane and H-plane pattern of an antenna in the present application in the range of f3=5.7~5.85GHz, the solid line represents 5.7GHz, the dotted line represents 5.85GHz, the smooth line is the horizontal plane, H-plane; the dash-dot line is the vertical plane, E-plane.

[0043] The reference signs in the drawings of the specification are as follows:

[0044] 1, conductor feed line; 11, straight section; 12, curved section; 121, flat section; 122, first arc section; 123, second arc section;

[0045] 2, vibrator unit; 21, vibrator upper arm; 22, vibrator lower arm; 221, horizontal section; 222, first conductor branch; 223, second conductor branch;

[0046] 3, substrate;

[0047] 4, DC short-circuit resistance;

[0048] 5, center feed point. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0050] In order to illustrate the technical scheme of the present application, the present application is described below through specific examples.

[0051] As shown in the drawings, Figures 1-4 An antenna according to an embodiment of the present application comprises two parallel conductor feed lines 1 and at least four vibrator units 2, the at least four vibrator units 2 are arranged along an axis to form a vibrator array, and the conductor feed line 1 coincides with the axis of the vibrator unit 2.

[0052] The conductor feed line 1 includes a straight segment 11 and a curved segment 12. Two adjacent oscillator units 2 are connected by the straight segment 11 or the curved segment 12, and a straight segment 11 is connected between every two adjacent curved segments 12, or a curved segment 12 is connected between every two adjacent straight segments 11.

[0053] In this embodiment, on the one hand, the combination of straight segment 11 and curved segment 12 of conductor feed line 1 balances impedance matching and high gain requirements in both high and low frequency bands. By setting curved segment 12, the total length of conductor feed line 1 is increased to exceed the total length of the dipole element 2, increasing the electrical length at low frequencies and improving the consistency of current distribution between array elements at high and low frequencies, thereby achieving tri-frequency high directivity. Furthermore, the number of dipole elements 2 is expanded from the conventional at least two to at least four, achieving multi-frequency, high-gain omnidirectional radiation. On the other hand, by using the combination of straight segment 11 and curved segment 12 of conductor feed line 1 and connecting at least four dipole elements 2, the antenna of the present invention achieves high gain while maintaining a small size. Compared with conventional four-element arrays, it features a compact structure, ease of fabrication, and low cost. When constructing a higher-gain array using the antenna of the present invention, the design of the feeding network is simplified due to the structure of conductor feed line 1.

[0054] In a preferred embodiment, a straight line segment 11 connects every two adjacent curve segments 12. The two curve segments 12 are mirror-symmetrical, or the two curve segments 12 have the same structure and are formed by an array of curve segments 12 along the axial direction of the oscillator unit 2.

[0055] like Figure 4 As shown, in some embodiments of the present invention, the curve segment 12 is a wavy line.

[0056] like Figure 4 As shown, in some embodiments of the present invention, the wavy lines are formed by a periodic array of zigzag units along the axis of the oscillator unit 2. Each zigzag unit includes a straight segment 121, a first arc segment 122, and a second arc segment 123. The straight segment 121 is connected to one end of the first arc segment 122, and the straight segment 121 coincides with the axis of the oscillator unit 2. The end of the first arc segment 122 away from the straight segment 121 is connected to the second arc segment 123. The first arc segment 122 and the second arc segment 123 are located on opposite sides of the axis of the oscillator unit 2, making the zigzag unit S-shaped.

[0057] In this embodiment, the total length of the conductor feed line 1 is increased by setting the first arc segment 122 and the second arc segment 123, and the shapes of the first arc segment 122 and the second arc segment 123 are easy to process.

[0058] As shown in Figure 4 In some embodiments of the present application, the straight section 121 extends from one end of the first arc section 122 to the other end of the first arc section 122, and a gap is provided between the straight section 121 and the first arc section 122 to increase the total length of the conductor feed line 1.

[0059] As shown in Figure 4 In some embodiments of the present application, the first arc section 122 and the second arc section 123 have the same diameter, facilitating the processing of the curved section 12.

[0060] As shown in Figure 4 In some embodiments of the present application, the length of the straight section 121 is 1 / 2 of the corresponding chord length of the first arc section 122, avoiding interference between the straight section 121 and the first arc section 122.

[0061] As shown in Figure 4 In some embodiments of the present application, the first arc section 122 and the second arc section 123 are semicircular arcs, and the length of the straight section 121 is the corresponding radius of the first arc section 122 and the second arc section 123, facilitating the processing of the straight section 121.

[0062] In some embodiments of the present application, the number of periods of the meandering unit is 8-16. It should be noted that the number of periods of the meandering unit can be changed according to requirements.

[0063] As shown in Figure 1 In some embodiments of the present application, the antenna further comprises a substrate 3, each of the dipole units 2 comprises a dipole upper arm 21 and a dipole lower arm 22, the dipole upper arm 21 of the dipole unit 2 is arranged on the upper surface of the substrate 3, the dipole lower arm 22 of the dipole unit 2 is arranged on the lower surface of the substrate 3, and the dipole upper arm 21 and the dipole lower arm 22 are connected as a whole by two conductor feed lines 1. Specifically, the conductor feed line 1 is printed on the substrate 3.

[0064] As shown in Figure 2 In some embodiments of the present application, the antenna further comprises two direct current short circuit resistances 4, and the two direct current short circuit resistances 4 are arranged between two adjacent dipole units 2. Two through holes (not shown in the figure) are provided on the substrate 3, and the two through holes are arranged between two adjacent dipole units 2. Specifically, the through hole is arranged opposite to the direct current short circuit resistance 4.

[0065] The direct current short-circuit resistance 4 is connected between the upper arm 21 of the vibrator and the lower arm 22 of the adjacent vibrator unit 2. Compared with the prior art scheme of short-circuiting the conductor feed line 1 through a metalized via, affecting impedance matching, and reducing directivity, the embodiment achieves low loss and high efficiency by arranging the direct current short-circuit resistance 4.

[0066] Specifically, the direct current short-circuit resistance 4 can be arranged on the upper surface or the lower surface of the substrate 3, as long as the direct current short-circuit resistance 4 is connected between the upper arm 21 and the lower arm 22 of the adjacent two vibrator units 2. The terminal of the upper arm 21 or the lower arm 22 is led out to the surface of the substrate 3 where the direct current short-circuit resistance 4 is located through a via hole.

[0067] Further, the resistance value of each direct current short-circuit resistance 4 is 20kΩ, and the total parallel resistance value is 10kΩ, which plays a lightning protection or detection function.

[0068] It should be noted that the number of direct current short-circuit resistances 4 is not limited to two, but can also be an even number greater than 2.

[0069] As shown in Figure 2 In some embodiments of the present application, the two direct current short-circuit resistances 4 are located in the middle of the vibrator array, ensuring the symmetry of the vibrator array.

[0070] It should be noted that the position of the direct current short-circuit resistance 4 can also be located at one end of the vibrator array.

[0071] As shown in Figure 1 and Figure 3 In some embodiments of the present application, the upper arm 21 and the lower arm 22 of the vibrator each include a horizontal segment 221, two first conductor branches 222, and two second conductor branches 223, the two second conductor branches 223 are arranged between the two first conductor branches 222, and the length of the first conductor branch 222 is greater than that of the second conductor branch 223. One end of each of the two first conductor branches 222 and the two second conductor branches 223 is connected with the horizontal segment 221. The length of the first conductor branch 222 is greater than that of the second conductor branch 223, so that the upper arm 21 and the lower arm 22 of the vibrator exhibit a dual-band feature, and actually operate in three frequency bands.

[0072] In some embodiments of the present application, the spacing between the first conductor branch 222 and the adjacent second conductor branch 223 is n, and 0 < n < 2mm. By controlling the spacing between the first conductor branch 222 and the second conductor branch 223, the bandwidth is improved.

[0073] In some embodiments of the present application, the length ratio of the first conductor branch 222 and the second conductor branch 223 is 2.0-2.5. By controlling the length ratio of the first conductor branch 222 and the second conductor branch 223, the antenna achieves high-gain omnidirectional radiation at 2.4GHz / 3.5GHz / 5.8GHz three-frequency WLAN / WiFi, and the ratio of the highest frequency 5.8GHz to the lowest frequency 2.4GHz is as high as 5.8 / 2.4=2.42.

[0074] In some embodiments of the present application, the spacing between the two adjacent vibrator units 2 is D=(0.35-0.45)*λ, where λ is the center wavelength at the 2.45GHz frequency band. When the spacing between the vibrator units 2 is within 0.35-0.45 times the center wavelength at the 2.45GHz frequency band, the antenna can obtain better array gain addition. If the spacing between the array elements is too small, the array gain addition cannot be obtained. If the spacing between the array elements is too large, the sidelobe will be lifted and the main lobe gain will be reduced, and thus better gain addition cannot be obtained.

[0075] In some embodiments of the present application, the thickness of the substrate 3 is 0.75mm-1.5mm, and / or the dielectric constant of the substrate 3 is 2-4. By controlling the thickness and dielectric constant of the substrate 3, the gain and bandwidth of the antenna are adjusted

[0076] As shown in Figure 1 In some embodiments of the present application, the antenna further comprises a center feeding point 5 located at the midpoint of the conductor feed line 1. Specifically, at the midpoint of the conductor feed line 1, a coaxial cable welding point is arranged, and the inner and outer conductors of the coaxial cable are welded on two parallel conductor feed lines 1, respectively.

[0077] In some embodiments of the present application, the antenna further comprises a radome (not shown in the figure) which is sleeved on the outer periphery of the substrate 3 to protect the antenna.

[0078] In some embodiments of the present application, the central axis of the radome coincides with the axis of the vibrator unit 2. Specifically, the radome is in the shape of a circular tube.

[0079] And / or, the thickness of the radome is 2mm-3mm.

[0080] And / or, the dielectric constant of the radome material is 3.5-4.5, and specifically, the material of the radome is selected from glass steel, polycarbonate (PC), ternary rubber (ASA), and other weather-resistant materials.

[0081] The antenna of the present embodiment is simulated and tested, and the test results are as follows Figures 5-13As shown, the directivity of the antenna of the embodiment is improved to 5-8dBi from 3-5dBi of the binary array, and is improved by 2-3dBi. The four vibrator units 2 are arranged in a straight line array with a spacing of 0.4075 center wavelengths of the 2.45GHz frequency band (D=0.4075·λ@2.45GHz), the entire array length L=196.20mm (1.602·λ@2.45GHz), and the width W=19mm (0.155·λ@2.45GHz). The four vibrator units 2 are fed by the feeding network 1. Figures 5-13 It can be known that the embodiment of the present application realizes 2.4GHz / 3.5GHz / 5.8GHz three-frequency WLAN / WiFi high-gain omnidirectional radiation, and the high and low frequency standing waves are VSWR<2.0 (2.4-2.5GHz), VSWR<2.0 (3.42-3.77GHz), VSWR<1.5 (5.725-5.85GHz), and the peak directivities are Dp=5dBi, 8.3dBi, and 7.5dBi, respectively. The horizontal non-circularities are less than 0.4dB, 1.3dB, and 2.6dB, respectively. The directivity is improved by 2-3dBi compared with the binary array. The directivity is greatly improved, so that the signal receiving capability of the terminal device is significantly enhanced, and the transmission distance is theoretically doubled. When the four-element array of the embodiment is used to construct an array with larger size and higher gain, the design of the feeding network will become simpler. For example, two four-element arrays of the embodiment are used to construct an eight-element array, compared with four binary arrays, the design of the feeding network is greatly simplified, and the cost is significantly reduced.

[0082] In another aspect, the embodiment of the present application further provides a communication device comprising the antenna according to any one of the above embodiments.

[0083] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the same. Although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalent features. The modification or replacement does not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An antenna, characterized by The antenna comprises two parallel conductor feed lines and at least four vibrator units, the at least four vibrator units are arranged along an axis to form a vibrator array, and the conductor feed lines coincide with the axis of the vibrator units. The conductor feed lines comprise straight segments and curved segments, two adjacent vibrator units are connected by the straight segments or the curved segments, and each two adjacent curved segments are connected by a straight segment, or each two adjacent straight segments are connected by a curved segment.

2. The antenna according to claim 1, characterized in that, The curved segments are corrugated lines.

3. The antenna according to claim 2, characterized in that, The corrugated lines are formed by periodic array of meandering units along the axis of the vibrator units, the meandering units comprise a straight segment, a first circular arc segment and a second circular arc segment, the straight segment is connected with one end of the first circular arc segment, and the straight segment coincides with the axis of the vibrator units; the first circular arc segment is connected with the second circular arc segment away from the other end of the straight segment, and the first circular arc segment and the second circular arc segment are located on both sides of the axis of the vibrator units.

4. The antenna according to claim 3, characterized in that, The straight segment extends from one end of the first circular arc segment to the other end of the first circular arc segment, and a gap is arranged between the straight segment and the first circular arc segment.

5. The antenna according to claim 3, wherein, The first circular arc segment and the second circular arc segment have the same diameter.

6. The antenna according to claim 5, characterized in that, The length of the straight segment is 1 / 2 of the corresponding chord length of the first circular arc segment.

7. The antenna according to claim 3, wherein, The first circular arc segment and the second circular arc segment are semicircular arcs.

8. The antenna according to claim 3, wherein, The number of periods of the meandering unit is 8-16.

9. The antenna according to claim 1, wherein, The antenna further comprises a substrate, each vibrator unit comprises a vibrator upper arm and a vibrator lower arm, the vibrator upper arm of the vibrator unit is arranged on the upper surface of the substrate, the vibrator lower arm of the vibrator unit is arranged on the lower surface of the substrate, and the vibrator upper arm and the vibrator lower arm are connected as a whole by the two conductor feed lines.

10. The antenna according to claim 9, characterized in that, The antenna further comprises two direct current short circuit resistors, the two direct current short circuit resistors are arranged between two adjacent vibrator units; two through holes are arranged on the substrate, and the two through holes are arranged between two adjacent vibrator units. The direct current short circuit resistor is connected between the vibrator upper arm and the vibrator lower arm of the adjacent vibrator unit.

11. The antenna according to claim 10, characterized in that, The two direct current short circuit resistors are located in the middle part of the vibrator array.

12. The antenna according to claim 9, wherein, The vibrator upper arm and the vibrator lower arm each comprise a horizontal segment, two first conductor branches and two second conductor branches, the two second conductor branches are arranged between the two first conductor branches, the length of the first conductor branch is greater than that of the second conductor branch, and one end of the two first conductor branches and the two second conductor branches is connected with the horizontal segment.

13. The antenna according to claim 12, characterized in that, The distance between the first conductor branch and the adjacent second conductor branch is n, 0 14. The antenna according to claim 12, wherein, The length ratio of the first conductor branch to the second conductor branch is 2.0-2.

5.

15. The antenna according to claim 9, wherein, The distance between the two adjacent vibrator units is D=(0.35-0.45)*λ, and λ is the center wavelength under the frequency of 2.45 GHz.

16. The antenna according to claim 9, wherein, The thickness of the substrate is 0.75 mm-1.5 mm, and / or the dielectric constant of the substrate is 2-4.

17. The antenna according to claim 9, wherein, The antenna further includes a radome, which is sleeved on the outer periphery of the substrate.

18. The antenna according to claim 17, characterized in that A central axis of the radome coincides with an axis of the dipole unit; And / or, a thickness of the radome is 2mm-3mm; And / or, a dielectric constant of the radome material is 3.5-4.

5.

19. The antenna according to claim 1, wherein, The antenna further includes a center feeding point, which is located at a midpoint of the conductor feeding line.

20. A communications device, characterized by An antenna as claimed in any one of claims 1-19.

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