Microstrip log-periodic antenna and radio transceiver

Abstract

The application discloses a microstrip logarithmic periodic antenna and a radio transceiver device, and the antenna comprises a radiation oscillator, a dielectric substrate, a metal ring, a ring carrier and a feed port; the radiation oscillator is arranged in a logarithmic periodic antenna array and is located on the dielectric substrate; the metal ring corresponds to the logarithmic periodic radiation oscillator one by one; the metal ring is discretely distributed on the surface of the ring carrier; and the metal ring and the radiation oscillator are in position correspondence and have the same number. By adding a plurality of conical ring metals outside the traditional logarithmic periodic antenna, the gain is increased, the sidelobe is reduced, and the logarithmic periodic antenna is better than the traditional logarithmic periodic antenna, and has many advantages such as high gain, high aperture efficiency, low sidelobe and miniaturization.

Description

Technical Field

[0001] This invention relates to the field of microwave antenna technology, specifically to a microstrip log-periodic antenna and a radio transceiver device. Background Technology

[0002] The Log-Periodic Dipole Antenna (LPDA) is a type of directional plate antenna with a wide bandwidth and high gain. As an ultra-wideband antenna with simple structure, excellent performance, and low cost, it can achieve almost constant impedance, radiation pattern, and gain across a wide frequency band, and has been widely used in shortwave, VHF, and microwave bands.

[0003] Currently, the design of log-periodic antennas focuses on ultra-wideband (UWB). Wideband technology is a crucial development direction in the field of wireless communication, with key advantages including high transmission rates, high processing gain, strong multipath and time resolution capabilities, improved spectrum utilization, good concealment, low power consumption, low cost, low complexity, and large system capacity. For example, in related technologies, Chinese invention patent application CN106252853A discloses an inverted-hat cone UWB antenna, comprising a grounding ring, a ground circle, and a conical cap. The conical cap is inverted and positioned on the ground circle, with a wavy conical surface. The grounding ring is supported on the ground circle by a grounding post, and the inner diameter of the grounding ring is larger than the outer diameter of the bottom surface of the conical cap. The grounding ring and the bottom surface of the conical cap are in the same plane. Chinese invention patent application CN110021819A discloses a microstrip printed ultrawideband log-periodic antenna, comprising an antenna layer microstrip board, a feed layer microstrip board, a metal reflector, and an RF connector. The antenna layer microstrip board, which has a trapezoidal plate structure, has a log-periodic antenna printed on it. The antenna layer microstrip board is vertically mounted on the metal reflector. The feed layer microstrip board is bonded to one side of the antenna layer microstrip board. The log-periodic antenna and the feed layer microstrip board are mounted on the same side, and the feed layer microstrip board is electrically connected to the log-periodic antenna. The RF connector is connected to the bottom end of the feed layer microstrip board, and the feed point is near ground.

[0004] However, the first of the aforementioned related technologies is a broadband monopole antenna, and the second invention is a conventional microstrip log-periodic antenna, both of which face the problems of low gain and high sidelobes. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to provide a microstrip log-periodic antenna with high gain and low sidelobes.

[0006] The present invention solves the above-mentioned technical problems through the following technical means:

[0007] A microstrip log-periodic antenna is proposed, comprising a radiating element, a dielectric substrate, metal rings, an annular carrier, and a feed port. The radiating element is arranged in a log-periodic antenna array and located on the dielectric substrate. The radiating element is electrically connected to the feed port. The metal rings are discretely distributed on the surface of the annular carrier, and the positions of the metal rings correspond to those of the radiating element, and the number of metal rings is the same.

[0008] Furthermore, the shape of the metal ring is circular, elliptical, square, trapezoidal, or triangular.

[0009] Furthermore, the annular carrier is conical in shape.

[0010] Furthermore, the dielectric substrate is trapezoidal.

[0011] Furthermore, the width of the metal ring is the same as the width of the radiating oscillator at its corresponding position.

[0012] Furthermore, the length and width of each pair of adjacent radiating oscillators are proportionally equal, and the proportional relationship is adjustable.

[0013] Furthermore, the power supply port is located on the upper and lower layers of the dielectric substrate.

[0014] Furthermore, the power supply port is located on the shorter side of the dielectric substrate.

[0015] Furthermore, the dielectric substrate has an upper base width of 16.114 mm, a lower base width of 75 mm, a length of 118.125 mm, a thickness of 1 mm, a dielectric constant of 2.65, and a loss angle of 0.001.

[0016] Furthermore, the present invention also proposes a radio transceiver device, which includes a microstrip log-periodic antenna as described above.

[0017] The advantages of this invention are:

[0018] (1) The present invention is based on the improvement of the log-periodic antenna. By setting up an annular carrier, multiple metal rings with the same number and one-to-one correspondence with the radiating dipole are discretely distributed on the surface of the annular carrier. The metal rings are combined to form a conical structure. The metal rings in this conical layout are coupled with the radiating dipole of the periodic antenna, thereby improving the gain of the periodic antenna and reducing the sidelobes. It is better than the traditional log-periodic antenna and has many advantages such as high gain, high aperture efficiency and low sidelobes.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a microstrip log-periodic antenna with a loaded metal ring proposed in an embodiment of the present invention;

[0021] Figure 2 This is a top view of a microstrip log-periodic antenna with a loaded metal ring according to an embodiment of the present invention;

[0022] Figure 3 This is a top view of a microstrip log-periodic antenna without a loaded metal ring in one embodiment of the present invention;

[0023] Figure 4 This is the H-plane radiation pattern of a microstrip log-periodic antenna without a metal ring in one embodiment of the present invention at 5 GHz;

[0024] Figure 5 This is the H-plane radiation pattern of a microstrip log-periodic antenna without a metal ring in one embodiment of the present invention at 7 GHz;

[0025] Figure 6 This is a voltage standing wave reflection coefficient diagram of a microstrip log-periodic antenna without a loaded metal ring in one embodiment of the present invention;

[0026] Figure 7 This is the H-plane radiation pattern of a microstrip log-periodic antenna with a loaded metal ring proposed in an embodiment of the present invention at 5 GHz.

[0027] Figure 8 This is the H-plane radiation pattern of a microstrip log-periodic antenna with a loaded metal ring proposed in an embodiment of the present invention at 7 GHz;

[0028] Figure 9 This is a voltage standing wave reflection coefficient diagram of a microstrip log-periodic antenna with a loaded metal ring proposed in an embodiment of the present invention.

[0029] In the picture:

[0030] 1-Dielectric substrate, 2-Radiative oscillator, 3-Metal ring, 4-Feed port, 5-Annular carrier. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1 to 2As shown, the first embodiment of the present invention proposes a microstrip log-periodic antenna, the antenna including a radiating element 2, a dielectric substrate 1, a metal ring 3, an annular carrier 5, and a feed port 4; the radiating element 2 is distributed in a log-periodic antenna array and located on the dielectric substrate 1, the metal ring 3 is electrically connected to the feed port 4, the metal ring 3 is discretely distributed on the surface of the annular carrier 5, and the positions of the metal ring 3 and the radiating element 2 are corresponding and the number is the same.

[0033] This embodiment improves upon the traditional log-periodic antenna by setting up an annular carrier 5. Multiple metal rings 3, which are the same number as the radiating dipoles 2 and are positioned one-to-one, are discretely distributed on the surface of the annular carrier 5. The metal rings are combined to form a conical structure. This conical arrangement of metal rings is coupled with the radiating dipoles of the periodic antenna, thereby improving the gain of the periodic antenna and reducing sidelobes. Compared with the traditional log-periodic antenna, it is better and has many advantages such as high gain, high aperture efficiency, low sidelobes and miniaturization.

[0034] In one embodiment, such as Figure 3 As shown, the dielectric substrate 1 is trapezoidal, and the width of the upper base of the dielectric substrate 1 is smaller than the width of the lower base.

[0035] Furthermore, the width of the upper base of the trapezoidal plate-shaped dielectric substrate 1 L x1 =16.114mm, bottom width L x2 =75mm, length Ly =118.125mm, thickness t=1mm, dielectric constant =2.65, the loss angle of dielectric substrate 1 is tan φ. δ =0.001.

[0036] Specifically, this size is set so that the characteristic impedance is set to 50 Ohm to facilitate port matching. The spatial rectangular coordinate system o-xyz includes: origin o, x-axis, y-axis, and z-axis. The dielectric substrate 1 is parallel to the xoy plane of the spatial rectangular coordinate system o-xyz.

[0037] In one embodiment, the radiating element 2 is distributed in a log-periodic antenna array and located on a trapezoidal plate-shaped dielectric substrate 1. The width of the radiating element 2 gradually increases along the direction from the upper bottom width to the lower bottom width of the dielectric substrate 1. The length and width of each two adjacent radiating elements 2 satisfy an equal proportional relationship, and the proportional relationship is adjustable.

[0038] Specifically, such as Figure 3 As shown, the radiating oscillator 2 consists of 13 pairs of rods, wherein the first rod is long. L 1 = 75mm, pole width W1 = 3mm, the length of the second rod L 2= L 1×0.88, W 2= W The ratio is 1×0.88, meaning that every two adjacent rods satisfy the proportional relationship. When the proportional relationship is 0.88, the simulation results of the voltage standing wave reflection coefficient of the microstrip log-periodic antenna are optimal.

[0039] In one embodiment, the width of the metal ring 3 is the same as the width of the radiating element 2 at the corresponding position. The size of the metal ring is set according to the size of the radiating element of the log-periodic antenna, and the width of the metal ring is also reduced proportionally. According to the principle of controlling variables, this setting can show the effect of the metal ring on the antenna gain. If the width of the metal ring 3 is not the same as the width of the radiating element 2 at the corresponding position, the influencing factors will increase.

[0040] In one embodiment, the metal ring 3 is preferably circular in shape, and the diameter of the metal ring is greater than or equal to the length of the radiating oscillator 2 at the corresponding position. Accordingly, the annular carrier 5 is a conical annular carrier made of foam, and the dielectric substrate 1 is located inside the conical annular carrier.

[0041] It should be noted that the metal ring structure is designed to create the largest possible enclosed area for the same circumference.

[0042] It should be noted that the shape of the metal ring 3 described in this embodiment can also be any closed geometric shape such as ellipse, square, trapezoid or triangle. This embodiment does not specifically limit the shape of the metal ring 3.

[0043] It should be understood that the shape of the annular carrier 5 is adapted to the shape of the metal ring 3. Those skilled in the art can determine the specific shape of the annular carrier 5 based on the specific shape of the metal ring 3. This embodiment does not make specific limitations.

[0044] In one embodiment, the power supply port 4 is located on the lower layer of the dielectric substrate 1.

[0045] It should be noted that the radiating oscillator 2 is located on the top layer of the dielectric substrate 1, and the power supply port 4 is located on the lower layer of the dielectric substrate 1 and is electrically connected to the radiating oscillator 2 on the upper layer. The power supply port 4 is used to power the radiating oscillator 2.

[0046] In one embodiment, the power supply port 4 is located on the shorter side of the dielectric substrate 1, i.e., at the upper bottom width, and is directly electrically connected to the radiating oscillator 2 on the upper layer of the dielectric substrate 1 to supply power to it.

[0047] Specifically, Figure 4 and Figure 5The H-plane radiation patterns of the microstrip log-periodic antenna without the metal ring 3 are shown at 5 GHz and 7 GHz, respectively. Figure 7 and Figure 8 The images show the H-plane radiation patterns of the log-periodic antenna with the added metal conical ring at 5 GHz and 7 GHz, respectively. Figure 4 , 5 and Figure 7 , 8 The comparison shows that the gain at each frequency point was improved after adding the metal conical ring. The gain was increased by about 1.1dB at 5GHz and by about 1.4dB at 7GHz, both of which were more than 1dB higher. The sidelobe was also reduced.

[0048] Specifically, the voltage standing wave ratios (VSWRs) of the microstrip log-periodic antenna without a metal ring and the log-periodic antenna with a metal ring in this invention are respectively as follows: Figure 6 and Figure 9 As shown.

[0049] The experimental results show that the microstrip log-periodic antenna with metal ring 3 proposed in this embodiment achieves high gain and low sidelobe performance.

[0050] Furthermore, the second embodiment of the present invention also proposes a radio transceiver device, which includes a microstrip log-periodic antenna as described in the first embodiment above.

[0051] It should be noted that other embodiments or implementation methods of the microstrip log-periodic antenna in the radio transceiver device of the present invention can refer to the above-described method embodiments, and will not be repeated here.

[0052] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Furthermore, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A microstrip log-periodic antenna, characterized in that, The antenna includes a radiating element, a dielectric substrate, metal rings, an annular carrier, and a feed port. The radiating element is arranged in a log-periodic antenna array and located on the dielectric substrate. The radiating element is electrically connected to the feed port. The metal rings are discretely distributed on the surface of the annular carrier, and the positions of the metal rings correspond to those of the radiating elements and the number of metal rings is the same. The annular carrier is conical, and the metal rings are combined together to form a conical structure.

2. The microstrip log-periodic antenna as described in claim 1, characterized in that, The dielectric substrate is trapezoidal, and the width of the upper base of the dielectric substrate is smaller than the width of the lower base.

3. The microstrip log-periodic antenna as described in claim 2, characterized in that, Along the direction from the upper bottom width to the lower bottom width of the dielectric substrate, the width of the radiating oscillator gradually increases, and the length and width of each two adjacent radiating oscillators satisfy an equal proportional relationship, and the proportional relationship is adjustable.

4. The microstrip log-periodic antenna as described in claim 1, characterized in that, The width of the metal ring is the same as the width of the radiating oscillator at its corresponding position.

5. The microstrip log-periodic antenna as described in claim 1, characterized in that, The power supply port is located on the lower layer of the dielectric substrate.

6. The microstrip log-periodic antenna as described in claim 4, characterized in that, The power supply port is located on the shorter side of the dielectric substrate.

7. The microstrip log-periodic antenna as described in claim 4, characterized in that, The dielectric substrate has an upper base width of 16.114 mm, a lower base width of 75 mm, a length of 118.125 mm, a thickness of 1 mm, a dielectric constant of 2.65, and a loss angle of 0.

001.

8. A radio transceiver device, characterized in that, The radio transceiver includes a microstrip log-periodic antenna as described in any one of claims 1 to 7.

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