CN219833031U - Broadband fractal dipole antenna - Google Patents

Abstract

The utility model provides a broadband fractal dipole antenna, which relates to the field of WLAN antenna technology, and comprises: fractal dipole radiator and dielectric substrate; the fractal dipole radiator comprises two radiation arms which are respectively arranged on two opposite surfaces of the dielectric substrate; the radiation arm comprises a first radiation substrate and a plurality of radiation pieces, the radiation pieces comprise a second radiation substrate and at least one radiation ring, the second radiation substrate is positioned in the radiation ring, and the second radiation substrate is connected with the radiation ring; the radiation rings in the same radiation piece are nested in sequence and connected with each other; according to the broadband fractal dipole antenna provided by the utility model, the connection and nested structure of the fractal dipole radiator are arranged, so that the resonance point of the antenna is increased, and the range of a wireless communication frequency band which can be covered by the broadband fractal dipole antenna is widened.

Description

Broadband fractal dipole antenna

Technical Field

The utility model relates to a WLAN antenna technology, in particular to a broadband fractal dipole antenna.

Background

The WLAN standards commonly used in engineering application at present are three types of WLAN standards including IEEE 802.11a, IEEE 802.11b and IEEE 802.11g, wherein the IEEE 802.11a standard uses 5GHz (5.15-5.35 GHz and 5.725-5.825 GHz) and the second two standards use 2.4GHz (2.4-2.484 GHz). In order to meet the portability of various mobile terminals, WLAN-connected devices are also being developed toward integration and miniaturization, and the performance of an antenna directly determines the quality of a communication system, so that the communication device and the antenna thereof should have miniaturized, broadband operation and radiation-stable operation characteristics.

In the related art, chinese patent discloses a miniaturized high isolation wireless local area network antenna (grant bulletin number CN 202977727U), which includes a substrate, two radiating units, the upper and lower bottom surfaces of the metal substrate are covered with convex metal layers, and the two radiating units are symmetrically disposed on two sides of the region of the upper and lower bottom surfaces of the substrate, which is not covered with the metal layers, respectively, and have the same shape. In a mobile communication system, antenna gain is extremely important for operation quality because it determines the signal level at the cell edge. Increasing or increasing the gain margin within a certain range may increase the coverage of the network in a certain direction. The higher the gain value, the wider the frequency band it can cover.

However, the antenna with the structure described in the above patent has a low operating frequency, and thus the range of wireless communication frequency band that can be covered by the antenna is narrowed.

Disclosure of Invention

In view of the above, the utility model provides a broadband fractal dipole antenna, which aims to solve the problem of narrow coverage range of the antenna to a wireless communication frequency band.

In order to achieve the above purpose, the wideband fractal dipole antenna provided by the utility model adopts the following technical scheme:

a wideband fractal dipole antenna, comprising: fractal dipole radiator and dielectric substrate; the fractal dipole radiator comprises two radiation arms which are respectively arranged on two opposite surfaces of the dielectric substrate;

the radiation arm comprises a first radiation substrate and a plurality of radiation pieces, the radiation pieces comprise a second radiation substrate and at least one radiation ring, the second radiation substrate is positioned in the radiation ring, and the second radiation substrate is connected with the radiation ring; the radiation rings in the same radiation piece are nested in sequence and connected with each other;

each radiation piece is sequentially connected, each radiation piece is sequentially arranged from the middle area of the medium substrate to the end of the medium substrate, the number of radiation rings of each radiation piece is sequentially reduced along the arrangement direction of the radiation pieces, and the first radiation substrate is connected with the radiation rings in the radiation pieces close to the end of the medium substrate.

By adopting the technical scheme, the two radiation arms of the fractal dipole radiator are respectively arranged on the two opposite surfaces of the dielectric substrate, so that the frequency emitted by the antenna covers the two sides of the dielectric substrate, and the coverage area of the antenna can be improved; the first radiation substrate and the plurality of radiation pieces are sequentially connected into the split antenna, so that additional resonance points are added, the gain value of the antenna is improved, and the working frequency band of the antenna is widened.

Here, the second radiating substrate and the radiating ring in each radiating element are mutually nested to form the fractal antenna, so that additional resonance points are further added, the gain value of the antenna is improved, and the working frequency band of the antenna is further widened. The technical problem of narrow coverage range of the antenna to the wireless communication frequency band is solved.

In some embodiments, which may include the above embodiments, the first radiating substrate of the two radiating arms is respectively directed toward opposite ends of the dielectric substrate;

the projections of the two radiation arms, which are directed towards the middle area of the dielectric substrate, at least partially coincide with each other.

Here, the first radiating substrates in the two radiating arms widen the operating bandwidth of the antenna by increasing the distance between the two first radiating substrates on the basis that the transmitting frequency of the antenna is not affected.

The projection of the two radiation arms on the middle area of the medium substrate is at least partially overlapped, so that the radiation arms can be conveniently connected with other elements, the size of the connecting part is reduced, the whole size of the antenna is reduced, and the antenna is miniaturized and is convenient.

In some embodiments, which may include the above embodiments, the second radiating substrate and the first side of the same side of each radiating ring in the same radiating element are connected, and the second side of the outer ring of the same radiating element is connected to another radiating element; wherein the first side is opposite to the second side.

In some embodiments that may include the foregoing embodiments, the radiation ring is a metal strip in an isosceles trapezoid shape, and the second radiation substrate is a metal plate in an isosceles trapezoid shape, and short bottom edges of the second radiation substrate in the same radiation member share the same section of the metal strip;

the long bottom edge of the outer ring of the same radiating piece is connected with the short bottom edge of the outer ring of the other radiating piece.

By adopting the technical scheme, the first radiating substrate and the plurality of radiating elements are sequentially connected into the split antenna, so that additional resonance points are added, the gain value of the antenna is improved, and the working frequency band of the antenna is widened.

In addition, the second radiating substrate and the radiating ring in each radiating element are mutually nested to form the fractal antenna, so that additional resonance points are further added, the gain value of the antenna is improved, and the working frequency band of the antenna is further widened.

In some embodiments, which may include the above embodiments, the first radiating substrate and the second radiating substrate are the same size;

the first radiation substrate and each radiation piece are symmetrically arranged relative to the arrangement direction of the radiation pieces.

By adopting the technical scheme, the sizes of the first radiation substrate and the second radiation substrate are set to be the same, so that a new resonance point can be formed, and the working bandwidth of the antenna can be widened.

In some embodiments, which may include the above embodiments, a wideband fractal dipole antenna further includes: the two split ring resonators are respectively arranged on two opposite surfaces of the dielectric substrate, the radiation arms are positioned in the split ring resonators, and the radiation arms are arranged in one-to-one correspondence with the split ring resonators.

The projection parts of the two split ring resonators on the middle area of the dielectric substrate are overlapped.

Optionally, the split ring resonator has a rectangular box shape with an opening.

By adopting the technical scheme, the split-ring resonator is used as a parasitic element of the fractal dipole antenna, and can be integrally resonant with the fractal dipole antenna at a lowest frequency point, and a new resonance point is added again due to the introduction of the split-ring resonator, so that the antenna can achieve coverage of a wider frequency range, and the working bandwidth of the antenna is widened.

In some embodiments, which may include the embodiments described above, the split-ring resonator and the fractal dipole radiator are metal etches.

Through adopting above-mentioned technical scheme, the metal etching piece is less in volume, and the metal etching piece can make split ring resonator and fractal dipole radiator can satisfy the required metal conductor environment of antenna normal operating, can reduce the overall thickness of antenna again for the antenna is miniaturized, convenient more.

In some embodiments, which may include the above embodiments, a wideband fractal dipole antenna further includes: the coaxial feeder is inserted on the medium substrate and comprises a first feeding piece and a second feeding piece which are coaxially arranged, the first feeding piece and the second feeding piece are insulated, and the first feeding piece and the second feeding piece are connected with the radiation arms.

Through adopting above-mentioned technical scheme, first feed piece and second feed piece have formed inside and outside shielding effect, make coaxial feeder improve the highest frequency of transmission, and then be favorable to the improvement of antenna operating frequency.

In some embodiments, which may include the above embodiments, the dielectric substrate is an epoxy glass cloth laminate, and the thickness of the dielectric substrate is 0.8mm to 1.2mm.

Through adopting above-mentioned technical scheme, epoxy glass cloth laminated board is by the alkali-free glass fiber cloth for electrician through chemical treatment as the substrate, uses epoxy resin as the laminate that the adhesive formed through hot pressing, adopts the dielectric substrate that epoxy glass laminated board made, and mechanical strength is high at high temperature, and electrical property stability is good under the high humidity, and dielectric substrate's thickness is 0.8mm ~ 1.2mm, is favorable to reducing the holistic thickness dimension of antenna, makes the antenna miniaturized, convenient.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. the antenna can realize the combination of the two fractal antenna forms, a plurality of resonance points exist through the combination of the two fractal antenna forms, and the frequency of each resonance point is close to each other through adjusting the proper size of the fractal dipole radiator, so that broadband radiation is achieved;

2. the first radiation substrate and the radiation rings with different sizes are sequentially connected to realize resonance of three different frequency points, and meanwhile, a resonance point is additionally added to the nested structure of the second radiation substrate and the radiation rings, so that broadband radiation is further widened;

3. the split ring resonator can be used as a parasitic element of the fractal dipole antenna, can be integrally resonant with the fractal dipole antenna at a lowest frequency point, and can be introduced to increase a new resonance point again, so that the antenna can reach the coverage of a wider frequency band, the working bandwidth of the antenna is widened, and a resonance point can be additionally increased at a high frequency position by adjusting the size of the overlapped part of the two split ring resonators.

Drawings

The following detailed description of the embodiments of the utility model is provided in connection with the accompanying drawings, it being understood that the embodiments described herein are for purposes of illustration and explanation only, and the utility model is not limited to the embodiments described below.

Fig. 1 is a schematic diagram showing a structure of a wideband fractal dipole antenna according to an embodiment of the present utility model;

fig. 2 is a schematic diagram showing another view angle of a wideband fractal dipole antenna according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram showing the bandwidth simulation result of a wideband fractal dipole antenna according to the embodiment of the present utility model when S11< -10 dB;

fig. 4 is a schematic diagram showing an omnidirectional radiation characteristic of an omnidirectional microstrip antenna at 2.45 GHz;

fig. 5 is a schematic diagram showing the omnidirectional radiation characteristics of the omnidirectional microstrip antenna at 5.5 GHz.

Reference numerals illustrate:

100. fractal dipole radiator;

110. a radiating arm;

111. a first radiation substrate;

112. a radiating member;

1121. a second radiation substrate;

1122. a radiating ring;

1123. a first side;

1124. a second side;

200. a dielectric substrate;

300. a split ring resonator;

400. a coaxial feed line;

410. a first power feeding member;

420. and a second power feeding member.

Specific embodiments of the present utility model have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of apparatus and methods consistent with aspects of the utility model as detailed in the accompanying claims.

Further, it should be noted that, in the description of the present utility model, terms such as "inner", "outer", and the like, refer to directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or component must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two components. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

The radio communication system is composed of a transmitting part, a receiving part and a space transmission medium, wherein the transmitting part and the receiving part are connected by using the free space transmission medium, and the transmitting and receiving parts observe the common air interface standard at the moment, and the free space medium transmits the radio frequency signals. Radio communications are often duplex, i.e. both parties to the communication configure the receiving/transmitting device. The equipment of the transmitting part comprises a transmitter, a transmitting antenna, a feeder line and the like; the equipment of the receiving section should include a receiving antenna, a feeder line and a receiver. In order to improve the radio communication quality, the transceiver devices of different services will be configured with different functional units; in order to increase the antenna conversion efficiency, there will be different forms of antennas to adapt to different radio communication networks.

Technical applications of modern radio communication systems can be generally classified into long-range radio communication networks, short-range radio communication networks and heterogeneous radio communication networks. They may often form a point-to-point or point-to-multipoint or multipoint-to-multipoint network topology.

The short-range radio communication system in turn comprises a mobile radio access system, such as: the WLAN system, also called wireless local area network (Wireless Local Area Network, WLAN), is a technology for realizing fast access to ethernet by using wireless technology, and the WLAN is a local area network formed by replacing traditional wired transmission medium with wireless channel, and can cover the range of tens of meters to hundreds of meters according to different product performances and propagation environments.

In the development process of the WLAN, various technical standards appear, the most important standards are IEEE 802.11 (Institute of Electrical and Electronics Engineers) series standards, three WLAN standards commonly used by engineering application at present are IEEE 802.11a, IEEE 802.11b and IEEE 802.11g, wherein the 5GHz band (5.15-5.35 GHz and 5.725-5.825 GHz) used by the IEEE 802.11a standard is adopted, and the 2.4GHz band (2.4-2.484 GHz) is adopted by the latter two standards.

In order to meet the needs of people for portability of various mobile terminals, devices employing WLAN connection are also moving toward integration and miniaturization, and the performance of antennas therein directly determines the quality of a communication system.

In a radio communication system, an antenna is a metallic conductor system that radiates and receives electromagnetic waves, and functions as an energy conversion (energy converter) in a communication link. The high-frequency electric energy signal output by the transmitter is coupled to the transmitting antenna through a transmission line, and is converted into electromagnetic energy to radiate into the air in the form of waves; the receiving antenna converts the electromagnetic energy in the air into electrical energy which is transmitted by the transmission line to the input of the receiver. It can be seen that an antenna is an important radio device that emits and receives electromagnetic waves, and that there is no antenna, and thus no radio communication.

This requires that the communication device and its antenna should have miniaturized, broadband operation and radiation stable operation characteristics.

In the related art, chinese patent discloses a miniaturized high isolation wireless local area network antenna (grant bulletin number CN 202977727U), which includes a substrate, two radiating units, the upper and lower bottom surfaces of the metal substrate are covered with convex metal layers, and the two radiating units are symmetrically disposed on two sides of the region of the upper and lower bottom surfaces of the substrate, which is not covered with the metal layers, respectively, and have the same shape.

It will be appreciated that in a mobile communication system, antenna gain is of paramount importance to the quality of operation of the device, since it determines the signal level at the edge of the cell, and increasing or increasing the gain margin within a certain range increases the coverage of the network in a certain direction. The higher the gain value, the wider the frequency band it can cover.

The antenna structure shown in the above patent has narrower lobe width of the radiating element, which results in narrower coverage of the working bandwidth, and can not realize broadband radiation and simultaneously work in 2.45GHz and 5GHz frequency bands of the WLAN.

In view of the above problems, the present utility model provides a broadband fractal dipole antenna, which increases the resonance points of the antenna by sequentially connecting or nesting the fractal dipole radiators, and achieves broadband radiation by adjusting the proper size of the fractal dipole radiators to make the resonance points close to each other in frequency. At the same time, a split ring resonator is introduced, and a resonance point is added again. The antenna is used for solving the problem that the working bandwidth of the antenna is narrow and broadband radiation cannot be realized.

The utility model will now be described in detail with reference to the accompanying drawings and examples:

referring first to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram illustrating a wideband fractal dipole antenna according to an embodiment of the present utility model, and fig. 2 is a schematic structural diagram illustrating another view angle of a wideband fractal dipole antenna according to an embodiment of the present utility model.

Referring to fig. 1 and 2, a broadband fractal dipole antenna according to an embodiment of the present utility model includes a fractal dipole radiator 100 and a dielectric substrate 200; the fractal dipole radiator 100 includes two radiation arms 110, where the two radiation arms 110 are respectively disposed on two opposite surfaces of the dielectric substrate 200, and a plane where the two fractal dipole radiators 100 are located is parallel to a plane where the dielectric substrate 200 is located.

The radiation arm 110 includes a first radiation substrate 111 and a plurality of radiation pieces 112, the radiation pieces 112 include a second radiation substrate 1121 and at least one radiation ring 1122, the second radiation substrate 1121 is located within the radiation ring 1122, and the second radiation substrate 1121 is connected with the radiation ring 1122; radiating rings 1122 within the same radiating element 112 are nested in sequence and connected to each other.

Each radiation piece 112 is sequentially connected, each radiation piece 112 is sequentially arranged from the middle area of the dielectric substrate 200 to the end of the dielectric substrate 200, the number of radiation rings 1122 of the radiation piece 112 sequentially decreases along the arrangement direction of the radiation pieces 112, and the first radiation substrate 111 is connected with the radiation rings 1122 in the radiation pieces 112 near the end.

In the above embodiment, by adjusting the dimensions of the first radiating substrate 111 and the radiating element 112 and sequentially connecting the first radiating substrate 111 with the radiating loops 1122 of different dimensions, resonance of three different frequency points is achieved, and in addition, the nested structure of the second radiating substrate 1121 and the radiating loops 1122 additionally adds one resonance point, so as to further widen the broadband radiation, and widen the wireless communication frequency band range that can be covered by the antenna.

FIG. 3 is a schematic diagram showing the bandwidth simulation result of a wideband fractal dipole antenna according to the embodiment of the present utility model when S11< -10 dB; wherein the horizontal axis of the graph represents the frequency range. Referring to FIG. 3, a wideband fractal dipole antenna according to an embodiment of the present utility model can meet the bandwidths required by IEEE 802.11b/g (2400-2484 MHz) and IEEE 802.11a (5150-5350 MHz,5725-5825 MHz) standards.

In one possible embodiment, the first radiating base plates 111 in the two radiating arms 110 are respectively oriented toward opposite ends of the dielectric base plate 200.

The radiation members 112 of the two radiation arms 110 facing the middle area of the dielectric substrate 200, the projections on the middle area of the dielectric substrate 200 at least partly coincide.

In the above embodiment, the overlapping portion exists in the radiating element 112 facing the middle area of the dielectric substrate 200 in the two radiating arms 110, so that the connection between the radiating arms 110 and other elements can be facilitated, the size of the connection portion is reduced, the overall size of the antenna is reduced, and the antenna is miniaturized and facilitated.

In one possible embodiment, the radiating element 112 includes a first side 1123 and a second side 1124, the second radiating substrate 1121 within the same radiating element 112 is connected to the first side 1123 on the same side of each radiating ring 1122, and the second side 1124 of the outer radiating ring 1122 in the same radiating element 112 is connected to another radiating element 112; wherein a first side 1123 is opposite a second side 1124 within the same radiating element 112.

The radiation ring 1122 is a metal belt having an isosceles trapezoid shape, the second radiation substrate 1121 is a metal plate having an isosceles trapezoid shape, and the short bottom sides of the second radiation substrate 1121 in the same radiation member 112 share the same metal belt.

The long bottom edge of outer radiating ring 1122 in the same radiating member 112 is connected to the short bottom edge of outer radiating ring 1122 in another radiating member 112.

In the above embodiment, the first radiating substrate 111 and the plurality of radiating elements 112 are sequentially connected to form a split antenna, so that additional resonance points are added, the gain value of the antenna is improved, and the working frequency band of the antenna is widened.

Fig. 4 is a schematic diagram showing an omnidirectional radiation characteristic of an omnidirectional microstrip antenna at 2.45 GHz; fig. 5 is a schematic diagram showing the omnidirectional radiation characteristics of the omnidirectional microstrip antenna at 5.5 GHz. Referring to fig. 4 and 5, the first radiating substrate 111, the second radiating substrate 1121, and the radiating ring 1122 together form an omni-directional microstrip antenna having better omni-directional radiation characteristics at both 2.45GHz and 5.5GHz, and the out-of-roundness of the H-plane is 0.3dB and 0.56dB, respectively.

In one possible embodiment, the first radiating substrate 111 and the second radiating substrate 1121 are the same size.

The first radiation substrate 111 and each radiation member 112 are symmetrically disposed with respect to the arrangement direction of the radiation members 112. The novel resonance point is formed, and the working bandwidth of the antenna is widened.

In one possible implementation, a wideband fractal dipole antenna further includes: the two split ring resonators 300 are respectively arranged on two opposite surfaces of the dielectric substrate 200, the radiation arms 110 are positioned in the split ring resonators 300, and the radiation arms 110 are arranged in a one-to-one correspondence with the split ring resonators 300.

The projected portions of the two split-ring resonators 300 on the middle region of the dielectric substrate 200 coincide.

The split ring resonator 300 has a rectangular block shape with an opening.

In the above embodiment, the split ring resonator 300 is used as a parasitic element of the fractal dipole antenna, and can resonate with the fractal dipole antenna at a lowest frequency point, and the split ring resonator 300 is introduced to add a new resonance point again, and by adjusting the size of the overlapping part of the two split ring resonators 300, one resonance point can be added at a high frequency. The antenna can reach the coverage of wider frequency band, and the working bandwidth of the antenna is widened.

In one possible implementation, split-ring resonator 300 and fractal dipole radiator 100 are metal etches. The metal etching piece is small in size, and can enable the split ring resonator 300 and the fractal dipole radiator 100 to meet the metal conductor environment required by normal operation of the antenna, and the overall thickness of the antenna can be reduced, so that the antenna is miniaturized and convenient.

In a possible implementation manner, the wideband fractal dipole antenna provided by the embodiment of the present utility model further includes: the coaxial feeder 400, the coaxial feeder 400 is inserted on the dielectric substrate 200, the coaxial feeder 400 includes a first feeding member 410 and a second feeding member 420 coaxially disposed, insulation is provided between the first feeding member 410 and the second feeding member 420, and the first feeding member 410 and the second feeding member 420 are connected to each radiating arm 110.

In the above embodiment, the first feeding member 410 and the second feeding member 420 form an inner and outer shielding effect, so that the coaxial feeder 400 increases the highest frequency of transmission, thereby facilitating the increase of the operating frequency of the antenna.

In one possible embodiment, the dielectric substrate 200 is an epoxy glass cloth laminate, and the thickness of the dielectric substrate 200 is 0.8mm to 1.2mm.

In the above embodiment, the epoxy glass laminated board is a laminated product formed by using alkali-free glass fiber cloth for electrician through chemical treatment as a base material and using epoxy resin as an adhesive through hot pressing, and the dielectric substrate 200 made of the epoxy glass laminated board has high mechanical strength at high temperature and good electrical performance stability at high humidity, and the thickness of the dielectric substrate 200 is 0.8 mm-1.2 mm, which is beneficial to reducing the thickness dimension of the whole antenna, and miniaturizing and facilitating the antenna.

The implementation principle of the broadband fractal dipole antenna provided by the embodiment of the utility model is as follows: the communication device communicates signals to the fractal dipole radiator 100 via the coaxial feed line 400 for transmitting or receiving radio signals. The first radiation substrate 111, the second radiation substrate 1121 and each radiation ring 1122 in the fractal dipole radiator 100 are connected and nested with each other in sequence, the fractal dipole radiator 100 in a butterfly shape is integrally formed, and the structure is beneficial to increasing the resonance point of the antenna; by introducing two split ring resonators 300 and adjusting the size of the overlapping part of the two split ring resonators 300, the resonance point can be increased again, so that the working bandwidth of the antenna is widened, and the technical problem that the coverage range of the antenna to a wireless communication frequency band is narrow is solved.

Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.

It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.

Claims (10)

1. A wideband fractal dipole antenna, comprising: fractal dipole radiator and dielectric substrate; the fractal dipole radiator comprises two radiation arms which are respectively arranged on two opposite surfaces of the dielectric substrate;

the radiation arm comprises a first radiation substrate and a plurality of radiation pieces, the radiation pieces comprise a second radiation substrate and at least one radiation ring, the second radiation substrate is positioned in the radiation ring, and the second radiation substrate is connected with the radiation ring; the radiation rings in the same radiation piece are nested in sequence and connected with each other;

each radiation piece is sequentially connected, each radiation piece is sequentially arranged from the middle area of the medium substrate to the end of the medium substrate, the number of radiation rings of each radiation piece is sequentially reduced along the arrangement direction of the radiation pieces, and the first radiation substrate is connected with the radiation rings in the radiation pieces close to the end of the medium substrate.

2. The wideband fractal dipole antenna as recited in claim 1, wherein said first radiating substrate of both of said radiating arms is respectively oriented toward opposite ends of said dielectric substrate;

the projections of the two radiation arms, which are directed towards the middle area of the dielectric substrate, at least partially coincide with each other.

3. The wideband fractal dipole antenna as recited in claim 2, wherein said second radiating substrate and a first side of a same side of each of said radiating loops within a same one of said radiating elements are connected, and wherein a second side of an outer one of said radiating loops within a same one of said radiating elements is connected to another one of said radiating elements; wherein the first side is opposite to the second side.

4. The wideband fractal dipole antenna as recited in claim 3, wherein said radiating loops are isosceles trapezoid shaped metal strips, said second radiating substrate is an isosceles trapezoid shaped metal plate, and the short bottom edges of said second radiating substrate in the same radiating element share the same section of said metal strips;

the long bottom edge of the outer ring of the same radiating piece is connected with the short bottom edge of the outer ring of the other radiating piece.

5. The wideband fractal dipole antenna as recited in claim 4, wherein said first radiating substrate and said second radiating substrate are the same size;

the first radiation substrate and each radiation piece are symmetrically arranged relative to the arrangement direction of the radiation pieces.

6. The wideband fractal dipole antenna as recited in any one of claims 1-5, further comprising two split-ring resonators, wherein two split-ring resonators are respectively arranged on two opposite surfaces of said dielectric substrate, said radiating arms are positioned within said split-ring resonators, and said radiating arms are arranged in one-to-one correspondence with said split-ring resonators; the projection parts of the two split ring resonators on the middle area of the dielectric substrate are overlapped.

7. The wideband fractal dipole antenna as recited in claim 6, wherein said split-ring resonator has a rectangular box shape with an opening.

8. The wideband fractal dipole antenna as recited in claim 6, wherein said split-ring resonator and said fractal dipole radiator are metal etches.

9. The wideband fractal dipole antenna as recited in any one of claims 1-5, further comprising a coaxial feed line interposed on said dielectric substrate, said coaxial feed line comprising a first feed element and a second feed element coaxially disposed, said first feed element and said second feed element being insulated from each other, said first feed element and said second feed element being connected to each of said radiating arms.

10. The wideband fractal dipole antenna as recited in any one of claims 1-5, wherein said dielectric substrate is an epoxy glass cloth laminate, and wherein the thickness of said dielectric substrate is 0.8 mm-1.2 mm.