Planar horizontal polarization omnidirectional antenna for wide area wireless interconnection communication

Abstract

The invention provides a horizontal polarization omnidirectional antenna for wide area wireless interconnection communication. The antenna comprises a dielectric substrate and printed antennas arranged on the top surface and the bottom surface of the dielectric substrate, a through hole serving as a feed probe space is formed in the circle center of the dielectric substrate, and the printed antenna comprises a plurality of end radiation units which are arranged in an annular array. The antenna is manufactured by adopting the double-sided copper-clad dielectric substrate and is designed in one layer of dielectric substrate, the whole structure can be processed and realized by utilizing a traditional PCB (Printed Circuit Board) technology, and the antenna is convenient to manufacture and low in cost. Compared with similar antennas, the antenna provided by the invention realizes high-gain horizontal polarization omnidirectional radiation, and has the advantages of low profile, simple feed mode and very high practical value.

Description

Technical Field

[0001] The present invention relates to the technical field of communication equipment, and in particular to a planar, low-profile, high-gain, horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications. Background Art

[0002] With the rapid development of next-generation communication technologies, the era of the Internet of Everything (IoE), based on wireless communications, is approaching. Antennas, as core components in the front-end of mobile terminal signal transmission and reception, face new challenges. To ensure stable connectivity between devices, terminal antennas must possess stable omnidirectional radiation characteristics to enable wide-area signal transmission and reception. Currently, omnidirectional antennas are widely used in various wireless communication applications due to their large coverage area, including indoor wireless local area networks (WLANs), outdoor broadcasting, and device-to-device (D2D) communication systems. Compared to vertically polarized antennas, horizontally polarized antennas are less affected by the ground and have stronger anti-interference capabilities. Furthermore, to adapt to the trend of miniaturization of wireless terminals, terminal antennas must be compact.

[0003] Currently, the main methods for implementing horizontally polarized omnidirectional antennas include planar loop antennas, waveguide slot antennas, and array antennas. Planar loop antennas typically operate in the fundamental resonant mode to achieve a uniform and in-phase current distribution, resulting in an omnidirectional radiation pattern. However, their radiation gain is generally low. Waveguide slot antennas, by adding radiating slots along the broadside of the waveguide, can achieve high-gain omnidirectional radiation, but the overall antenna size is large and the profile is high. Horizontally polarized omnidirectional antennas can also be implemented using array technology, but such designs typically require complex feed structures.

[0004] Therefore, a new horizontally polarized omnidirectional antenna is needed to solve the above problems. Summary of the Invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a planar, low-profile, high-gain, horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications.

[0006] According to the present invention, a planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communication includes: a dielectric substrate, and printed antennas arranged on the top and bottom surfaces of the dielectric substrate;

[0007] A through hole serving as a feeding probe space is provided at the center of the dielectric substrate. The printed antenna comprises a plurality of end-point radiating units, which are arranged in a ring array.

[0008] Preferably, the dielectric substrate is circular, the radius of the dielectric substrate is 175 mm, the through hole is cylindrical, and the diameter of the through hole is 1.27 mm.

[0009] Preferably, the printed antenna is a ring array antenna, which is composed of 7 end-pointing radiating units rotating in a horizontal plane.

[0010] Preferably, the end-point radiation unit includes a feeder line and a plurality of radiation branches extending from the feeder line in parallel, one section of the radiation branch is printed on the top surface of the dielectric substrate, and another section of the radiation branch is printed on the bottom surface of the dielectric substrate.

[0011] Preferably, the radiation branch is arranged at an angle of 54° to the feeder line.

[0012] Preferably, the end-pointing radiation unit is arranged along the center of the annular antenna array toward the distal end, with the first radiation branch located 65 mm away from the center of the annular antenna array, the radiation branch spacing is 18 mm, and the length of the first radiation branch is 30 mm;

[0013] Each radial branch is 2 mm shorter than the previous one.

[0014] Preferably, the fifth and sixth radiating branches are set to have different lengths and widths to improve impedance matching and antenna side lobes.

[0015] Preferably, a circular patch is provided at the center of the ring antenna array, and the circular patch is electrically connected to the feed line.

[0016] Preferably, it further comprises an impedance converter and a triangular patch, one end of the impedance converter is connected to the circular patch, the other end of the impedance converter is connected to the bottom edge of the triangular patch, and the tip of the triangular patch is connected to the feed line.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This invention utilizes a double-sided copper-clad dielectric substrate, designed within a single dielectric substrate. The overall structure can be fabricated using traditional PCB technology, making it easy to manufacture and inexpensive. Compared to similar antennas, this antenna achieves high-gain horizontally polarized omnidirectional radiation, a low profile, and a simple feeding method, making it highly practical.

[0019] 2. This low-profile, high-gain, horizontally polarized omnidirectional antenna based on a planar printed circuit has a compact structure, achieves horizontally polarized radiation in the WiFi frequency band, and has a simple feeding method and a low profile, making it very suitable for application in WiFi communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1A top view of a planar, low-profile, high-gain, horizontally polarized, omnidirectional antenna for wide-area wireless interconnection communications according to the present invention;

[0022] Figure 2 A top view of a radiation unit of a planar, low-profile, high-gain, horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to the present invention;

[0023] Figure 3 A reflection coefficient diagram of the planar low-profile high-gain horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to the present invention;

[0024] Figure 4 A two-dimensional radiation pattern of a planar, low-profile, high-gain, horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to the present invention;

[0025] Figure 5 The figure is a gain diagram of the planar low-profile high-gain horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to the present invention.

[0026] Description of reference numerals:

[0027] Dielectric substrate 1, end-point radiation unit 2, feed line 21, radiation branch 22, circular patch 3, impedance transformer 4, triangular patch 5. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0029] The present invention discloses a planar low-profile high-gain horizontally polarized omnidirectional antenna for wide-area wireless interconnection communication, referring to Figure 1 , including: a dielectric substrate 1, and printed antennas arranged on the top and bottom surfaces of the dielectric substrate 1.

[0030] The dielectric substrate 1 is circular with a radius of 175 mm. A cylindrical through hole with a diameter of 1.27 mm is provided at the center of the circle, which serves as a feeding probe space.

[0031] The printed antenna is a ring array antenna, which is composed of seven end-pointing radiating elements 2 rotating in a horizontal plane.

[0032] Reference Figure 2As shown, the end-point radiating unit 2 of an example of the present invention is fed by a transmission line. The feed line 21 leads to parallel radiating branches 22. One arm of the radiating branch 22 is printed on the top surface of the dielectric substrate 1, and the other arm is printed on the bottom surface of the dielectric substrate 1, forming a series-fed dipole antenna array with end-point radiation characteristics. The radiating branch 22 is at a 54° angle to the transmission line. From the center of the annular antenna array to the far end, the first radiating branch 22 is located 65 mm from the center of the array. The distance between the first radiating branch 22 and the second radiating branch 22 is 18 mm, and the length of the first radiating branch 22 is 30 mm. Each radiating branch 22 is 2 mm shorter than the previous radiating branch 22. The fifth and sixth radiating branches 22 are set with different lengths and widths to improve impedance matching and antenna side lobes.

[0033] In a preferred embodiment, the end-point radiation unit 2 is rotated in the horizontal plane, and 7 units are combined to obtain the following Figure 1 A circular patch 3 with a radius of 16 mm is added at the center of rotation.

[0034] The antenna is fed through a 50-ohm coaxial feedline at its center. A 34mm-long impedance transformer 4 and a triangular patch 5 are added to serve as a transition zone for impedance transformation. Unit dimensions are adjusted and optimized using the full-wave electromagnetic simulation software Ansys HFSS. By adjusting various antenna parameters, the antenna's bandwidth can cover the 2.4-2.48 GHz frequency band used by WiFi.

[0035] The antenna unit dimensions in this example are: dielectric substrate 1 radius R0 = 175 mm, circular patch 3 radius R1 = 16 mm, triangular patch 5 height L g =11mm, the distance S between the first radiation branch 22 and the second radiation branch 22 d1 =20mm, length of the first radiation branch 22 L d1 =30mm, the length of the fifth radiation branch 22 is L i1 =20mm, the length of the sixth radiation branch 22 is L i2 =24mm, the width of the fifth radiation branch 22 W i1 =12mm, the width of the sixth radiation branch 22 is W i2 =10mm, feeder line width W r =1mm, the width of the impedance transformer 4 is W f =12mm, width W of the first to fourth radiating branches 22 d =4.5mm.

[0036] In a preferred embodiment, the dielectric substrate 1 is made of a material with a relative dielectric constant of 3.55, a loss angle of 0.0027, and a thickness of 1.57 mm.

[0037] The materials of the top loop antenna array / metal antenna and the bottom loop antenna array are both copper, and the thickness is about 17um.

[0038] like Figure 3 As shown, the reflection coefficient (|S 11 |) Figure 1 shows that the -10dB impedance bandwidth of the present invention is 2.37 to 2.51 GHz. This impedance bandwidth covers the WiFi frequency band of 2.4 to 2.48 GHz, which coincides with the operating frequency required by the above-mentioned antenna design.

[0039] like Figure 4 The figure shows the two-dimensional radiation pattern of an example of the present invention at a center frequency of 2.44 GHz. The left figure shows the antenna's E-plane pattern, and the right figure shows the antenna's H-plane pattern. The antenna is positioned horizontally, with the E-plane representing the xy plane and the H-plane representing the yz plane. In the azimuth plane, the antenna's gain fluctuation is less than 0.8 dB, and the main polarization electric field amplitude exceeds the cross-polarization electric field amplitude by more than 15 dB, meeting practical application requirements.

[0040] like Figure 5 The figure shows the gain of the frequency characteristic of the embodiment of the present invention. The peak radiation gain of the antenna in the operating frequency band is 3.87dBi. The gain fluctuation in the passband (2.37-2.51GHz) is 2.89-3.87dBi.

[0041] In summary, this low-profile, high-gain, horizontally polarized omnidirectional antenna based on a planar printed circuit has a compact structure, achieves horizontally polarized radiation in the WiFi frequency band, and has a simple feeding method and a low profile, making it very suitable for application in WiFi communications.

[0042] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0043] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications, characterized in that: include: a dielectric substrate, and printed antennas disposed on the top and bottom surfaces of the dielectric substrate; A through hole serving as a feeding probe space is provided at the center of the dielectric substrate. The printed antenna comprises a plurality of end-point radiating units, which are arranged in a ring array.

2. The planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communication according to claim 1, characterized in that: The dielectric substrate is circular, and the radius of the dielectric substrate is 175 mm. The through hole is cylindrical, and the diameter of the through hole is 1.27 mm.

3. The planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communication according to claim 1, characterized in that: The printed antenna is a ring array antenna, which is composed of 7 end-to-end radiating units rotating in a horizontal plane.

4. The planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to claim 1, characterized in that: The end-point radiation unit includes a feeder line and a plurality of radiation branches extending from the feeder line and arranged in parallel. One section of the radiation branch is printed on the top surface of the dielectric substrate, and another section of the radiation branch is printed on the bottom surface of the dielectric substrate.

5. The planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to claim 4, characterized in that: The radiation branches are arranged at an angle of 54° to the feeder line.

6. The planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to claim 4, characterized in that: The end-pointing radiation unit is arranged along the center of the loop antenna array toward the distal end, with the first radiation branch located 65 mm away from the center of the loop antenna array, the spacing between the first radiation branch and the second radiation branch is 18 mm, and the length of the first radiation branch is 30 mm; Each radial branch is 2 mm shorter than the previous one.

7. The planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to claim 6, characterized in that: The fifth and sixth radiating branches are set with different lengths and widths to improve impedance matching and antenna side lobes.

8. The planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to claim 6, characterized in that: A circular patch is provided at the center of the loop antenna array, and the circular patch is electrically connected to the feed line.

9. The planar horizontally polarized omnidirectional antenna for wide-area wireless interconnection communications according to claim 6, characterized in that: It also includes an impedance converter and a triangular patch, one end of the impedance converter is connected to the circular patch, the other end of the impedance converter is connected to the bottom edge of the triangular patch, and the tip of the triangular patch is connected to the feed line.

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