Planar radio frequency antenna

Abstract

The utility model relates to a planar radio frequency antenna, belongs to the technical field of antennas, and solves the technical problem that the input impedance and radiation characteristics of the conventional planar radio frequency antenna cannot be adjusted as required. The planar radio frequency antenna comprises a dielectric substrate, a radiator, a grounding plate and a feed connecting line, the radiator is fixedly arranged on one surface of the dielectric substrate, the grounding plate is opposite to the other surface of the dielectric substrate, the feed connecting line is connected between the radiator and the grounding plate to transmit and receive electromagnetic waves, the feed connecting line comprises a probe, and the probe is arranged on the other surface of the dielectric substrate. The radiating body is provided with a plurality of feeding points, the feeding points are located at different positions on the radiating body, and the probe can be connected to any feeding point; according to the planar radio frequency antenna, the probe is connected with the feeding points at different positions on the radiator, flexible feeding configuration can be performed on the planar radio frequency antenna, and the input impedance and radiation characteristics of the antenna can be adjusted by changing the feeding points connected with the probe so as to adapt to different working frequencies and application requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to antenna technical field especially relates to a kind of plane radio frequency antennas. BACKGROUND

[0002] Plane radio frequency antenna is a kind of antenna structure for feeding, and it is an antenna in microwave and radio frequency field. It is widely used in wireless communication, radar, satellite communication and multiple fields. This kind of antenna is composed of a metal patch (radiation body) and a ground plane, and the two are separated by a dielectric layer. Plane radio frequency antenna gradually attracts people's attention due to its small size, low profile, easy to manufacture and other advantages. When the feeding network provides electromagnetic energy to the metal patch, the current distribution on the metal patch will produce electromagnetic radiation, so as to realize the emission and reception of signal.

[0003] The existing plane radio frequency antenna design has certain limitations in adjusting input impedance and radiation characteristics, and it is difficult to flexibly adapt to different working frequencies and application requirements. Specifically, the traditional microstrip antenna usually has fixed geometric shape and material parameters, which makes them only show the best performance under certain working conditions. Once the working frequency or application scenario needs to be changed, the entire antenna structure often needs to be redesigned, which increases the development time and cost. In addition, in some cases, fixed design may also limit the best performance that the antenna can achieve, such as not being able to fully optimize bandwidth or improve gain.

[0004] The existing plane radio frequency antenna is not convenient for adjusting the input impedance and radiation characteristics of the antenna, and cannot adapt to different working frequencies and application requirements with a set of equipment. SUMMARY

[0005] In view of the above analysis, the utility model aims at providing a kind of plane radio frequency antenna to solve the technical problem that the input impedance and radiation characteristics of the existing plane radio frequency antenna cannot be adjusted as required.

[0006] The purpose of the utility model is mainly realized through the following technical schemes:

[0007] A kind of plane radio frequency antenna, including dielectric substrate, radiation body, ground plate and feed connection line, the radiation body is fixedly arranged on the surface of the dielectric substrate, the ground plate is opposite to the other surface of the dielectric substrate, the feed connection line is connected between the radiation body and the ground plate to transmit and receive electromagnetic wave;

[0008] The feed connection line includes probe, the radiation body is equipped with a plurality of feed points, the feed point is located at different positions on the radiation body, and the probe can be connected to any feed point.

[0009] Further, the planar radio frequency antenna further comprises an antenna frame body, and the dielectric substrate, the grounding plate and the feed connection line are arranged on the antenna frame body.

[0010] Further, the antenna frame body comprises a vertical stand and a substrate clamping groove, the substrate clamping groove is arranged on the vertical stand to clamp the dielectric substrate, and the grounding plate is fixedly arranged at the bottom end of the vertical stand.

[0011] Further, the vertical stand comprises vertical stand rods and tripods, the vertical stand rods are respectively fixed on each corner of the tripods, and the substrate clamping groove is movable on the vertical stand rods.

[0012] Further, the substrate clamping groove comprises a connecting rod, a slot, a through hole, a stud and a threaded hole, the slot is arranged at one end of the connecting rod to clamp the dielectric substrate, the through hole is arranged on the connecting rod to pass through the vertical stand rod, the threaded hole is arranged at the other end of the connecting rod and communicates with the through hole, the stud is matched with the threaded hole and can abut against the vertical stand rod.

[0013] Further, the probe comprises a connecting section and an abutting section fixedly arranged on the connecting section, and the abutting section abuts against the feed point.

[0014] Further, the feed connection line comprises a coaxial cable, the coaxial cable comprises a center wire, an insulating material layer, an outer wire and an outer sheath, the center wire is arranged in the insulating material layer, the outer wire is arranged outside the insulating material layer, the outer sheath is wrapped outside the outer wire, the center wire is connected with the probe, and the outer wire is connected with the grounding plate.

[0015] Further, the probe is connected with a metal capacitive sheet for coupling and feeding the radiator.

[0016] Further, the radiator is a metal patch, and the radiator is one of a rectangle, a circle, a triangle, a circular ring and a trapezoid.

[0017] Further, the angle between the connecting section and the abutting section is smaller than a straight angle.

[0018] Further, the radiator is printed on one surface of the dielectric substrate.

[0019] The technical scheme of the utility model can realize at least one of the following effects:

[0020] (1) The plane radio frequency antenna, the radiator is fixedly arranged on one surface of the dielectric substrate, a plurality of feed points are arranged on the radiator, the feed points at different positions on the radiator are connected through probes, flexible feed configuration can be performed on the plane radio frequency antenna, the input impedance and the radiation characteristics of the antenna can be adjusted by changing the feed points connected by the probes, so that different working frequencies and application requirements can be adapted.

[0021] (2) The plane radio frequency antenna, the radiator is fixedly arranged on one surface of the dielectric substrate, a plurality of feed points are arranged on the radiator, the feed points at different positions on the radiator are connected through probes, flexible feed configuration can be performed on the plane radio frequency antenna, the input impedance and the radiation characteristics of the antenna can be adjusted by changing the feed points connected by the probes, so that different working frequencies and application requirements can be adapted.

[0022] In the utility model, the above-mentioned each technical scheme can be combined mutually, to realize more preferred combination scheme. Other features and advantages of the utility model will be set forth in the subsequent description, and part of the advantages can become apparent from the description, or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the contents which are pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings are only for the purpose of showing specific embodiments, and are not considered as limiting the utility model, and the same reference signs represent the same parts in the whole drawings.

[0024] Figure 1 It is the structure schematic view of plane radio frequency antenna in the utility model embodiment;

[0025] Figure 2 It is the schematic view of probe connection in the utility model embodiment;

[0026] Figure 3 It is the cross section schematic view of coaxial cable in the utility model embodiment;

[0027] Figure 4 It is the structure schematic view of antenna frame body in the utility model embodiment;

[0028] Figure 5 It is the structure schematic view of substrate clamping groove in the utility model embodiment.

[0029] In the figure, 1 - dielectric substrate, 2 - radiator, 21 - feed point, 3 - ground plate, 4 - feed connection line, 41 - probe, 411 - connecting section, 412 - abutting section, 413 - metal capacitive patch, 42 - coaxial cable, 421 - central conductor, 422 - insulating material layer, 423 - outer conductor, 424 - outer sheath, 5 - antenna frame body, 51 - stand, 511 - vertical stand, 512 - tripod, 52 - substrate clamping groove, 521 - connecting rod, 522 - slot, 523 - through hole, 524 - stud, 525 - threaded hole. DETAILED DESCRIPTION

[0030] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, wherein the drawings form a part of the utility model, and are used together with the embodiments of the utility model to explain the principles of the utility model, and are not used to limit the scope of the utility model.

[0031] The technical scheme of the present application and how the technical scheme of the present application solves the above technical problems will be described in detail below with specific embodiments.

[0032] As shown in Figure 1 and Figure 2 The utility model embodiment provides a kind of plane radio frequency antenna, including dielectric substrate 1, radiator 2, ground plate 3 and feed connection line 4, radiator 2 is fixedly arranged on the surface of dielectric substrate 1, ground plate 3 is opposite to another surface of dielectric substrate 1, and feed connection line 4 is connected between radiator 2 and ground plate 3 to transmit and receive electromagnetic wave;Feed connection line 4 includes probe 41, and a plurality of feed points 21 are provided on radiator 2, and feed point 21 is located at different positions on radiator 2, and probe 41 can be connected to any feed point 21;Dielectric substrate 1 is as the bearing base of radiator 2, provides required mechanical support and dielectric environment for radiator 2, and radiator 2 is the main part of antenna, for emitting and / or receiving electromagnetic wave, and feed connection line 4 and the probe 41 included therein are used to transmit radio frequency signal to radiator 2, and radiator 2 can be metal patch, and radiator 2 can be one of rectangle, circle, triangle, circular ring and trapezoid, and radiator 2 can be printed on the surface of dielectric substrate 1, and ground plate 3 is used to reflect the electromagnetic wave radiated by patch, to enhance the radiation performance of antenna, and plane radio frequency antenna is excited by the radio frequency electromagnetic field on the radiator 2 on dielectric substrate 1, and radiates outward through the gap between radiator 2 and ground plate 3.

[0033] The feeding points 21 are arranged on the radiator 2, the probes 41 are connected with the feeding points 21 at different positions on the radiator 2, the planar radio frequency antenna can be flexibly fed, the input impedance and the radiation characteristics of the antenna can be adjusted by changing the feeding points 21 connected by the probes 41, so as to adapt to different working frequencies and application requirements, thereby solving the technical problem that the input impedance and the radiation characteristics of the existing planar radio frequency antenna cannot be adjusted as required; specifically, a plurality of feeding points 21 are arranged on the surface of the radiator 2, each feeding point 21 is located at a different position on the surface of the radiator 2, this layout enables the researchers to quickly experiment and determine the optimal feeding point combination during the research and development stage without the need to re-manufacture the entire antenna structure, of course, the change of the position of the feeding point 21 can also be adjusted in real time according to the environmental changes or task requirements in actual use; the probe 41 can be flexibly connected to any one of the preset feeding points 21, changing the position connected by the probe 41 can directly affect the input impedance and the resonant frequency of the planar radio frequency antenna, and then adjust its radiation characteristics such as the radiation pattern, the gain and the like, such a design not only simplifies the installation and maintenance process, but also provides higher fault tolerance and reliability for the planar radio frequency antenna, even if a certain specific feeding point 21 fails, it can be quickly switched to other standby feeding points 21 to ensure the continuous operation of the system.

[0034] In a preferred embodiment of the utility model, as shown in Figure 4 The utility model discloses a planar radio frequency antenna, which comprises a dielectric substrate 1, a ground plate 3 and a feeding connection line 4, wherein the dielectric substrate 1 is provided with a plurality of feeding points 21, and the feeding connection line 4 is connected with the feeding points 21 at different positions on the dielectric substrate 1, so that the planar radio frequency antenna can be flexibly fed, and the input impedance and the radiation characteristics of the antenna can be adjusted by changing the feeding points 21 connected by the probes 41, so as to adapt to different working frequencies and application requirements.

[0035] Preferably, as shown in Figure 4As shown, the stand 51 comprises three vertical stand poles 511 and at least one triangular frame 512, and the three vertical stand poles 511 are fixed on each corner of the triangular frame 512 respectively.

[0036] On this basis, as shown in the figure, Figure 4 The substrate clamping groove 52 is movably fixed on the stand 51, and at least one substrate clamping groove 52 is arranged on the stand 51, and the substrate clamping groove 52 can move in the vertical direction on the stand 51, so that the distance between the medium substrate 1 and the ground plate 3 arranged thereon and the radiating body 2 can be flexibly adjusted, and the bandwidth optimization and impedance adjustment of the planar radio frequency antenna can be performed, and the substrate clamping groove 52 can move in the vertical direction on the stand 51, so that the antenna performance can be optimized by adjusting the position of the substrate clamping groove 52 without changing the physical structure of the planar radio frequency antenna, which simplifies the debugging process and provides convenience for rapid prototyping and experiments. Similarly, such convenience is also applicable to the actual use of the planar radio frequency antenna.

[0037] Further, as shown in the figure, Figure 4 and Figure 5 The substrate clamping groove 52 comprises a connecting rod 521, a slot 522, a through hole 523, a stud 524 and a threaded hole 525, the slot 522 is arranged at one end of the connecting rod 521 for clamping the medium substrate 1, the through hole 523 is arranged on the connecting rod 521 for the vertical stand pole 511 to pass through, the threaded hole 525 is arranged at the other end of the connecting rod and communicates with the through hole 523, and the stud 524 is matched with the threaded hole 525 and can tightly abut against the vertical stand pole 511; by means of the through hole 523, the connecting rod 521 can move on the vertical stand pole 511 so that the slot 522 is located at different positions, and by means of the cooperation of the stud 524 and the threaded hole 525, the stud 524 can tightly abut against the vertical stand pole 511 so that the connecting rod 521 is fixed, and thus the medium substrate 1 is fixed at a position.

[0038] In a preferred embodiment of the utility model, as shown in the figure, Figure 2 The probe 41 comprises a connecting section 411 and an abutting section 412 fixed on the connecting section 411, and the abutting section 412 abuts against the feeding point 21; the angle between the connecting section 411 and the abutting section 412 is smaller than a straight angle, and the feeding connection line 4 is connected to the connecting point between the radiating bodies 2 through the probe 41 to transmit the radio frequency signal to the radiating bodies 2, in order to facilitate the connection of the probe 41 and the feeding point 21 of the radiating body 2, the probe 41 is divided into the connecting section 411 and the abutting section 412, and the abutting section 412 is connected to the feeding point 21, and in the actual connection process, the connecting section 411 is parallel to the surface of the radiating body 2, for example, the abutting section 412 can be connected to the feeding point 21 through welding or crimping.

[0039] In a preferred embodiment of the utility model, the probe 41 is connected with a metal capacitor sheet 413, the metal capacitor sheet 413 does not contact the radiator 2, wherein the metal capacitor sheet 413 can be provided with one or more pieces; by placing the metal capacitor sheet 413 on the probe 41 but not directly contacting the radiator 2, a capacitive coupling path can be formed between the probe 41 and the radiator 2, the coupling path allows the radio frequency signal to be transmitted from the probe 41 to the radiator 2 without the need for direct electrical connection in physics, the metal capacitor sheet 413 is arranged to couple and feed the radiator 2, so as to compensate the inductance caused by the probe 41, further, the working frequency and impedance matching of the planar radio frequency antenna can be fine-tuned by adjusting the position, size or shape of the metal capacitor sheet 413 on the probe 41.

[0040] In a preferred embodiment of the utility model, as shown in Figure 3 The feeding connection line 4 includes a coaxial cable 42, the coaxial cable 42 includes a center wire 421, an insulating material layer 422, an outer wire 423 and an outer sheath 424, the center wire 421 is arranged in the insulating material layer 422, the outer wire 423 is arranged outside the insulating material layer 422, the outer sheath 424 is wrapped outside the outer wire 423, the center wire 421 is connected to the probe 41, and the outer wire 423 is connected to the grounding plate 3; during signal transmission, the center wire 421 is used to carry signal current, the insulating material layer 422 is used to prevent signal leakage to the outer wire 423, the outer wire 423 acts as a shielding layer to prevent external electromagnetic interference from entering the cable interior, this structure enables the coaxial cable to have anti-interference capability and enables stable signal transmission; the center wire 421 is connected to the radiator 2 and acts as a main signal transmission channel, during signal transmission, the center wire 421 carries signal current and is a carrier of electromagnetic wave transmission; exemplarily, the center wire 421 is made of copper material to ensure efficient signal transmission; the outer wire 423 is connected to the grounding plate 3 and forms a shielding layer for reducing electromagnetic interference, exemplarily, the outer wire 423 is made of metal woven mesh.

[0041] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A planar radio frequency antenna, characterized in that, It includes a dielectric substrate (1), a radiator (2), a ground plane (3), and a power supply connection line (4). The radiator (2) is fixedly disposed on one surface of the dielectric substrate (1), and the ground plane (3) is opposite to the other surface of the dielectric substrate (1). The power supply connection line (4) is connected between the radiator (2) and the ground plane (3) to transmit and receive electromagnetic waves. The power supply connection line (4) includes a probe (41). The radiator (2) is provided with a plurality of power supply points (21). The power supply points (21) are located at different positions on the radiator (2). The probe (41) can be connected to any of the power supply points (21).

2. The planar radio frequency antenna according to claim 1, characterized in that, The planar radio frequency antenna also includes an antenna frame (5), and the dielectric substrate (1), the ground plane (3), and the feed connection line (4) are all disposed on the antenna frame (5).

3. The planar radio frequency antenna according to claim 2, characterized in that, The antenna frame (5) includes a support frame (51) and a substrate clamping groove (52). The substrate clamping groove (52) is disposed on the support frame (51) to clamp the dielectric substrate (1). The ground plane (3) is fixedly disposed at the bottom end of the support frame (51).

4. The planar radio frequency antenna according to claim 3, characterized in that, The stand (51) includes a vertical pole (511) and a tripod (512). The vertical pole (511) is fixed to each corner of the tripod (512), and the substrate clamping groove (52) is movable on the vertical pole (511).

5. The planar radio frequency antenna according to claim 4, characterized in that, The substrate clamping groove (52) includes a connecting rod (521), a slot (522), a through hole (523), a stud (524), and a threaded hole (525). The slot (522) is opened at one end of the connecting rod to clamp the dielectric substrate (1). The through hole (523) is opened on the connecting rod (521) for the vertical support (511) to pass through. The threaded hole (525) is opened at the other end of the connecting rod and communicates with the through hole (523). The stud (524) is fitted into the threaded hole (525) and can press against the vertical support (511).

6. The planar radio frequency antenna according to claim 1, characterized in that, The probe (41) includes a connecting section (411) and an abutting section (412) fixedly disposed on the connecting section (411), the abutting section (412) abutting against the power supply point (21).

7. The planar radio frequency antenna according to claim 1, characterized in that, The power supply connection line (4) also includes a coaxial cable (42), which includes a center conductor (421), an insulating material layer (422), an outer conductor (423), and an outer sheath (424). The center conductor (421) is disposed inside the insulating material layer (422), the outer conductor (423) is disposed outside the insulating material layer (422), and the outer sheath (424) wraps around the outer conductor (423). The center conductor (421) is connected to the probe (41), and the outer conductor (423) is connected to the ground plane (3).

8. The planar radio frequency antenna according to claim 1, characterized in that, The probe (41) is connected to a metal capacitor (413) for coupling and feeding the radiator (2).

9. The planar radio frequency antenna according to claim 1, characterized in that, The radiator (2) is a metal patch, and the radiator (2) is one of the following shapes: rectangular, circular, triangular, annular, and trapezoidal.

10. The planar radio frequency antenna according to claim 6, characterized in that, The angle between the connecting segment (411) and the abutting segment (412) is less than a flat angle.

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