CN105048076A - Novel fractal plane ultra-wideband antenna - Google Patents

Abstract

A novel fractal plane ultra-wideband antenna belongs to the wireless communication technical field. The novel fractal plane ultra-wideband antenna is composed of a medium plate (3), a radiation unit (2) and a feed unit (4) printed on one face of the medium plate (3) and directly communicated with each other, and a grounding unit (6) printed on the other face of the medium plate. The radiation unit (2) is a metal patch formed by performing iterative fractal operations twice or more times and being a communicating body. A slit (1) is etched on the radiation unit. The grounding unit (6) is a trapezoidal metal patch. A rectangular groove (5) is etched on the central position of the grounding unit upper bottom edge. The novel fractal plane ultra-wideband antenna has the advantages of ultra wide band, good directivity, low standing-wave ratio, small volume, lightness, low profile, low cost, easy processing, easy circuit integration, relatively low manufacturing cost, high precision and repeatability. The antenna which achieves great impedance match is suitably used for miniaturized equipment. Batch production is further facilitated.

Description

A novel fractal plane ultra-wideband antenna

Technical field

The present invention relates to novel fractal ultra wide band antenna, belong to wireless communication technology field.

Background technology

Along with the high speed development of wireless communication field, the miniaturization of terminal communication device becomes a kind of trend.A characteristic feature of flat plane antenna is exactly that size is little, section is low, lightweight, volume is little, therefore the flat plane antenna of miniaturization conveniently can be applied to mobile terminal.

The parts that antenna transmits and receives as wireless communication system, not only require that antenna has miniaturization, and require multiband and wide band characteristic.The self similarity had in conjunction with fractal structure and space filling characteristic, be applied in Antenna Design, and antenna can be made to realize multifrequency and miniaturization, carries out adjustment simultaneously make multiple resonance point close to each other and then realize broadband to fractal structure.

Ultra broadband (Ultra-wideband, UWB) technology is a kind of novel short distance high-rate wireless communication technology.For many years, this technology uses always in military field.UWB, after civil area is open, is expected to rely on the transmission rate of its superelevation and the advantage such as low-power, low cost to connect people market to short-distance wireless and injects new vitality.The UWB being applied to wireless communication field is a kind of lower powered radiotechnics.2002, it was 7.5GHz that Federal Communications Committee (FCC) has issued a bandwidth criteria, and the frequency range of covering is the ultra-broadband wireless communication frequency band of 3.1GHz-10.6GHz.Compared with the wireless communication technology that other are traditional, the advantage of UWB mainly contains that transmission rate is high, communication distance is short, average transmit power is low, good concealment, is is not easily intercepted and captured, and high, the multi-path resolved rate of confidentiality is high, be suitable for pocket application etc.Traditional UWB technology uses baseband transmission, and without the need to carrying out rf modulations and demodulation, make UWB equipment power consumption little, cost is low, and flexibility is high, is suitable for pocket wireless application.

Novel planar ultra-wideband antenna based on fractal structure of the present invention, by literature search, has no the open report identical with the present invention.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a novel fractal plane ultra-wideband antenna is provided.

Novel fractal plane ultra-wideband antenna of the present invention, by dielectric-slab (3), is printed on dielectric-slab one side upper and radiating element (2) that is that be directly communicated with and feed element (4), and is printed on ground unit (6) formation on dielectric-slab another side, wherein:

1) radiating element (2) for formed through more than twice or twice iterative fractal and be the metal patch of connected component, on it, etching has gap (1);

2) method of radiating element (2) iterative fractal is:

A. four of square radiation fin angles being cut respectively an angle is 90 degree fan-shaped, and fan-shaped radius is 1/3rd of square radiation fin, material is thus formed the first time iteration of fractal structure;

B. 5 squares can be marked off to first time fractal rear remaining part, each little foursquare area is 1/9th of fractal front whole foursquare radiation fin area, cutting an angle respectively to each little foursquare four angles is 90 degree fan-shaped, and fan-shaped radius is 1/3rd of the little square length of side, thus just define the second time iteration of fractal structure;

3) ground unit (6) is trapezoidal metal patch, and a rectangular slot (5) is carved with in the center of feather edge thereon.

By that analogy, can obtain three times and the antenna of above iterations.The present invention increases the resonant frequency point of antenna by increasing iterations, and adds bandwidth.

Through the radiating element (2) that second iteration is formed, as shown in Figure 1.

Compared with prior art, tool has the following advantages in the present invention:

A. volume is little, lightweight, section is low, cost is low, easy processing, to be easy to circuit integrated;

B. cost of manufacture is lower and precision is very high, also has repeatability, is suitable for compact apparatus and uses, be convenient to batch production.

Accompanying drawing explanation

Fig. 1 is front view structural representation of the present invention.

Fig. 2 is rearview structural representation of the present invention.

Fig. 3 is emulation and the test result of antenna return loss in the present invention.

Fig. 4 is the emulation of E face and the antenna pattern measured when 3GHz.

Fig. 5 is the emulation of H face and the antenna pattern measured when 3GHz.

Fig. 6 is the emulation of E face and the antenna pattern measured when 5.5GHz.

Fig. 7 is the emulation of H face and the antenna pattern measured when 5.5GHz.

Fig. 8 is the emulation of E face and the antenna pattern measured when 7.5GHz.

Fig. 9 is the emulation of H face and the antenna pattern measured when 7.5GHz.

Figure 10 is the emulation of face, E face and the antenna pattern measured when 9.5GHz.

Figure 11 is the emulation of H face and the antenna pattern measured when 9.5GHz.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.

A novel fractal plane ultra-wideband antenna of the present invention, by dielectric-slab (3), is printed on dielectric-slab one side upper and radiating element (2) that is that be directly communicated with and feed element (4), and is printed on ground unit (6) formation on dielectric-slab another side, wherein:

1) radiating element (2) for formed through more than twice or twice iterative fractal and be the metal patch of connected component, on it, etching has gap (1);

2) method of radiating element (2) iterative fractal is:

A. four of square radiation fin angles being cut respectively an angle is 90 degree fan-shaped, and fan-shaped radius is 1/3rd of square radiation fin, material is thus formed the first time iteration of fractal structure;

B. 5 squares can be marked off to first time fractal rear remaining part, each little foursquare area is 1/9th of fractal front whole foursquare radiation fin area, cutting an angle respectively to each little foursquare four angles is 90 degree fan-shaped, and fan-shaped radius is 1/3rd of the little square length of side, thus just define the second time iteration of fractal structure;

3) ground unit (6) is trapezoidal metal patch, and a rectangular slot (5) is carved with in the center of feather edge thereon.

By that analogy, can obtain three times and the antenna of above iterations.The present invention increases the resonant frequency point of antenna by increasing iterations, and adds bandwidth.Here the embodiment of second iteration is only provided.

Through the radiating element 2 of twice iteration formation, as shown in Figure 1

This antenna uses FR-4 dielectric-slab, and its relative dielectric constant is 4.4, and dielectric loss angle tangent is 0.02, and adopt microstrip line to carry out feed, the length of side of the square radiation fin before fractal is 27mm.Antenna size size of the present invention is 39mm*27mm*1.6mm.

The present invention increases the resonant frequency point of antenna frequency band by increasing iterations, constantly increase bandwidth.

The present invention adopts microstrip line to carry out feed.Contrast emulation as shown in Figure 3 and test result, the frequency range that the novel fractal plane ultra-wideband antenna S11 that can design is less than-10dB is 2.6-10.8GHz.The H face directional diagram of antenna is approximately circular; In 2.6-10.8GHz, peak gain is between 2.5 to 6.8dBi.Therefore, the fractal antenna of design can be used in UWB communication equipment.

Claims (2)

1. a novel fractal plane ultra-wideband antenna, it is characterized in that this novel fractal plane ultra-wideband antenna is by dielectric-slab (3), be printed on dielectric-slab one side to go up and the radiating element (2) be directly communicated with and feed element (4), and the ground unit (6) being printed on dielectric-slab another side is formed, wherein:

A. radiating element (2) for formed through more than twice or twice iterative fractal and be the metal patch of connected component, on it, etching has gap (1);

B. ground unit (6) is trapezoidal metal patch, and a rectangular slot (5) is carved with in the center of feather edge thereon.

2. the fractal method of novel fractal plane ultra-wideband antenna according to claim 1, is characterized in that the fractal method of the radiating element (2) in this ultra-wideband antenna is:

A. four of square radiation fin angles being cut respectively an angle is 90 degree fan-shaped, and fan-shaped radius is 1/3rd of square radiation fin, material is thus formed the first time iteration of fractal structure;

B. 5 squares can be marked off to first time fractal rear remaining part, each little foursquare area is 1/9th of fractal front whole foursquare radiation fin area, cutting an angle respectively to each little foursquare four angles is 90 degree fan-shaped, and fan-shaped radius is 1/3rd of the little square length of side, thus just define the second time iteration of fractal structure;

C. continue just to form third time iteration by the method for above-mentioned b step to the fractal rear remaining structure of second time.