CN106505304A - A kind of fractal ring antenna with impedance matching - Google Patents
A kind of fractal ring antenna with impedance matching Download PDFInfo
- Publication number
- CN106505304A CN106505304A CN201610894751.1A CN201610894751A CN106505304A CN 106505304 A CN106505304 A CN 106505304A CN 201610894751 A CN201610894751 A CN 201610894751A CN 106505304 A CN106505304 A CN 106505304A
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- fractal
- ring antenna
- antenna
- fractal ring
- impedance matching
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- 239000002184 metal Substances 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims abstract description 43
- 238000013461 design Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 208000033978 Device electrical impedance issue Diseases 0.000 description 1
- 101150105133 RRAD gene Proteins 0.000 description 1
- 125000002015 acyclic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- Details Of Aerials (AREA)
Abstract
The present invention relates to a kind of fractal ring antenna with impedance matching, the fractal ring antenna includes the metal flat being arranged in ring, and the metal flat is used for the impedance matching for adjusting fractal ring antenna.The present invention provide fractal ring antenna relative to prior art be improved by be additionally arranged a metal flat in its ring, the metal flat that sets up is used for being adjusted the input impedance of fractal ring antenna, as metal flat is provided in ring, therefore do not increase extra area, be conducive to the Miniaturization Design of fractal ring antenna；It is demonstrated experimentally that this Antenna Design of application, under conditions of other performances are not weakened, can reach more excellent impedance matching effect.
Description
Technical field
The present invention relates to Antenna Design field, more particularly, to a kind of fractal ring antenna with impedance matching.
Background technology
In radio communication and microwave energy transfer field, loop antenna is widely used.And fractals have
Space filling and the characteristic of self similarity.Therefore fractals and Antenna Design are combined, it is possible to achieve the miniaturization of antenna
And multi-frequency Characteristic.
For girth is similar to the loop antenna of wavelength, its radiation impedance is 200 ohms.This characteristic of loop antenna
So that it is difficult 50 ohm circuits of coupling standard.Existing technology is general when impedance matching is carried out to which to be passed through apart from day
An infinitely-great ground level reflector is placed at line horizontal direction h, in theory, selects a suitable height h adjust
Antenna feed impedance is allowed to match 50 ohm.However, such plane of reflection increased the overall size of antenna.If antenna is
Manufacture as the thickness of commercially available this substrate is fairly limited, therefore often cannot if the levels of single-layer medium substrate PCB
Choose suitable h.And this scheme for introducing reflection ground level to adjust radiation impedance increased overall size, this does not meet day
The requirement of compactedness in line design.
Content of the invention
A difficult problem of the present invention for the above prior art of solution, there is provided a kind of fractal ring antenna, the antenna possess impedance
The ability of matching somebody with somebody, and as its part for being used for adjusting impedance is provided in ring, therefore fractal ring antenna does not increase total area,
Even more miniaturization can be made to.
For realizing that above goal of the invention, the technical scheme of employing be：
A kind of fractal ring antenna with impedance matching, the fractal ring antenna include the metal flat being arranged in ring,
The metal flat is used for the impedance matching for adjusting fractal ring antenna.
In such scheme, the metal flat being arranged in ring can dramatically improve the input impedance of fractal ring antenna,
Size when being embodied as by adjusting metal flat can just make fractal ring antenna match to required impedance, while improve dividing
Shape loop antenna matches lower resonant frequency.As metal flat is provided in ring, therefore antenna can be designed to more
Plus miniaturization.
Preferably, the fractal ring antenna adopts KOCH fractal structures.
Preferably, the metal flat is through hollow processing.
Preferably, the rectangular shape of the fractal ring antenna, its each edge are provided with KOCH fractal structures, its feed port
It is arranged in any a line of rectangular-shaped fractal ring antenna.
Preferably, the fractal ring antenna has a rectangular shape or oblong-shaped, the square shape or OBL point
The each edge of shape loop antenna is formed by connecting by 22 rank KOCH fractal structures；Its feed port is arranged in any a line
At point.
Preferably, the rectangular shape of the metal flat.
Preferably, in equilateral triangle shape, each edge of the equilateral triangle shape fractal ring antenna is equal for the fractal ring antenna
It is formed by connecting by 22 rank KOCH fractal structures, its feed port is arranged on the midpoint of any a line.
Preferably, the metal flat is in equilateral triangle shape.
Compared with prior art, the invention has the beneficial effects as follows：
The present invention provide fractal ring antenna relative to prior art be improved by be additionally arranged a metal flat in its ring,
The metal flat that sets up is used for being adjusted the input impedance of fractal ring antenna, as metal flat is provided in ring,
Therefore do not increase extra area, be conducive to the Miniaturization Design of fractal ring antenna；It is demonstrated experimentally that this Antenna Design of application,
Under conditions of other performances are not weakened, more excellent impedance matching effect can be reached.
Description of the drawings
Structural representations of the Fig. 1 for the fractal ring antenna of embodiment 1.
Structural representations of the Fig. 2 for another kind of preferred version of the fractal ring antenna of embodiment 1.
Structural representations of the Fig. 3 for the fractal ring antenna of embodiment 2.
Structural representations of the Fig. 4 for another kind of preferred version of the fractal ring antenna of embodiment 2.
Fig. 5 is the structural representation of the fractal ring antenna that inside is not provided with metal flat.
Equivalent circuit diagrams of the Fig. 6 for the fractal ring antenna of Fig. 5.
Equivalent circuit diagrams of the Fig. 7 for the fractal ring antenna of Fig. 1.
Reflection coefficient comparison diagrams of the Fig. 8 for the fractal ring antenna of Fig. 1, Fig. 5.
Emulation 3D radiation gain directional diagrams of the Fig. 9 for the fractal ring antenna of Fig. 1.
The 2D gain patterns of the YZ planes that Figure 10 is emulated for the fractal ring antenna of Fig. 1 and test is obtained.
Figure 11 is the highest-gain and efficiency chart that the fractal ring antenna measurement of Fig. 1 is obtained.
Specific embodiment
Accompanying drawing being for illustration only property explanation, it is impossible to be interpreted as the restriction to this patent；
Below in conjunction with drawings and Examples, the present invention is further elaborated.
Embodiment 1
As shown in figure 1, the fractal ring antenna 1 that the present embodiment is provided has a rectangular shape, its each edge is by 22 ranks
KOCH fractal structures 2 are formed by connecting, and its feed port 3 is arranged on the midpoint of any a line, meanwhile, fractal ring antenna 1
A metal flat 4 is provided with ring, in the present embodiment, the metal flat 4 has a rectangular shape, the metal flat 4 is used for adjusting
The impedance matching of whole fractal ring antenna 1.
In such scheme, the metal flat 4 being arranged in ring can dramatically improve the input impedance of fractal ring antenna 1,
Impedance needed for size by adjusting metal flat 4 matches just can fractal ring antenna 1 in the specific implementation, while change
Kind fractal ring antenna 1 matches lower resonant frequency.As metal flat 4 is provided in ring, therefore antenna can set
Count to obtain more miniaturization.
As shown in Fig. 2 the metal flat 4 can according to impedance matching need carry out hollow processing.Through hollow processing
Metal flat 4 annular in shape.
Embodiment 2
As shown in figure 3, the fractal ring antenna 1 that the present embodiment is provided is in equilateral triangle shape, the equilateral triangle shape fractal ring
The each edge of antenna 1 is formed by connecting by 22 rank KOCH fractal structures 2, and its feed port 3 is arranged in any a line
At point.A metal flat 4 is provided with the ring of fractal ring antenna 1, and the metal flat 4 is in equilateral triangle shape.The metal is put down
Face 4, when being embodied as, is for being mated to the impedance of fractal ring antenna 1.
In such scheme, the metal flat 4 being arranged in ring can dramatically improve the input impedance of fractal ring antenna 1,
Impedance needed for size by adjusting metal flat 4 matches just can fractal ring antenna 1 in the specific implementation, while change
Kind fractal ring antenna 1 matches lower resonant frequency.As metal flat 4 is provided in ring, therefore antenna can set
Count to obtain more miniaturization.
As shown in figure 4, the metal flat 4 can according to impedance matching need carry out hollow processing.Through hollow processing
Metal flat 4 annular in shape.
Embodiment 3
Fig. 6 is the equivalent circuit diagram of the fractal ring antenna 1 of Fig. 5, and therefore the input impedance of feed port 3 can be counted
Calculate：
Wherein, Cp is the equivalent parasitic capacitances between 2 feed connections, and C1 is that the equivalent series of fractal ring antenna 1 are parasitic
Electric capacity, equivalent series stray inductances of the L1 for fractal ring antenna 1, equivalent radiated power resistance of the Rrad for loop antenna, ω is angular frequency
ω=2 π f.Due to the series equivalent ohmage very little of loop antenna, ignore herein.
The source impedance of hypothesis feed port 3 is ZO, can obtain reflection coefficient is
It is the equivalent circuit diagram of the fractal ring antenna 1 of Fig. 1 shown in Fig. 7, the ring internal impedance coupling metal flat increase of increase
Series equivalent inductance, inductance increment are L2.The operation principle of increase inductance can be understood as：Fractal ring antenna is equivalent to transformation
The coil of device, in ring, metal flat increased equivalent inductance equivalent to the iron staff in the middle of transformer coil, therefore show coil
Additionally connect equivalent inductance L2.The L1 in above formula is replaced with L1+L2 now, then input impedance is：
It is consequently possible to calculate obtaining the reflection coefficient S11. of fractal ring antenna shown in Fig. 1
It is the comparison diagram of the reflection coefficient S11 of the fractal ring antenna of Fig. 1 and Fig. 5 shown in Fig. 8, in Fig. 1, Fig. 5, KOCH point of shape
1 consistent size of fractal ring antenna of structure, only difference is that the acyclic interior metal flat of antenna in Fig. 5, in the antenna loop of Fig. 1
It is provided with metal flat.The antenna of Fig. 1 has lower S11 as seen from Figure 8, that is, there is more preferable impedance matching effect；
The mid frequency of Fig. 1 antennas is also lower simultaneously, and this illustrates that metal covering can make antenna more in ring in the case of the frequency of design
Plus miniaturization.With the method for equivalent circuit diagram modeling and simulating, it is also possible to verify the effect of above-mentioned lifting impedance matching.
Emulation 3D radiation gain directional diagrams of the Fig. 9 for the fractal ring antenna of Fig. 1.Figure 10 is emulated for the fractal ring antenna of Fig. 1
The 2D gain patterns of the YZ planes obtained with test.Figure 11 is the highest-gain and effect that the fractal ring antenna measurement of Fig. 1 is obtained
Rate figure.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no need to be exhaustive to all of embodiment.All this
Any modification, equivalent and improvement that is made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (8)
1. a kind of fractal ring antenna with impedance matching, it is characterised in that：The fractal ring antenna is included and is arranged in ring
Metal flat, the metal flat are used for the impedance matching for adjusting fractal ring antenna.
2. the fractal ring antenna with impedance matching according to claim 1, it is characterised in that：The fractal ring antenna is adopted
KOCH fractal structures.
3. the fractal ring antenna with impedance matching according to claim 1, it is characterised in that：The metal flat is through engraving
Manage in vacancy.
4. the fractal ring antenna with impedance matching according to claim 2, it is characterised in that：The fractal ring antenna is in square
Shape, its each edge are provided with KOCH fractal structures, and its feed port is arranged on any a line of rectangular-shaped fractal ring antenna
On.
5. the fractal ring antenna with impedance matching according to claim 4, it is characterised in that：The fractal ring antenna is in just
The each edge of square shape or oblong-shaped, the square shape or OBL fractal ring antenna is by 22 rank KOCH points of shapes
Structure is formed by connecting；Its feed port is arranged on the midpoint of any a line.
6. the fractal ring antenna with impedance matching according to claim 5, it is characterised in that：The metal flat is rectangular
Shape.
7. the fractal ring antenna with impedance matching according to claim 2, it is characterised in that：The fractal ring antenna is in just
Triangle, each edge of the equilateral triangle shape fractal ring antenna are formed by connecting by 22 rank KOCH fractal structures, and which is presented
Electric port is arranged on the midpoint of any a line.
8. the fractal ring antenna with impedance matching according to claim 7, it is characterised in that：The metal flat is in positive three
Angular shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610894751.1A CN106505304A (en) | 2016-10-13 | 2016-10-13 | A kind of fractal ring antenna with impedance matching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610894751.1A CN106505304A (en) | 2016-10-13 | 2016-10-13 | A kind of fractal ring antenna with impedance matching |
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| Publication Number | Publication Date |
|---|---|
| CN106505304A true CN106505304A (en) | 2017-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610894751.1A Pending CN106505304A (en) | 2016-10-13 | 2016-10-13 | A kind of fractal ring antenna with impedance matching |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188325A (en) * | 1999-09-20 | 2008-05-28 | 弗拉克托斯股份有限公司 | Multi-level antenna |
| CN103151606A (en) * | 2013-02-04 | 2013-06-12 | 河北科技大学 | Nested type Koch fractal Beidou dual-frequency micro-strip antenna |
| CN104836020A (en) * | 2015-05-15 | 2015-08-12 | 广东盛路通信科技股份有限公司 | Coplanar omnidirectional horizontally polarized fractal dipole antenna |
-
2016
- 2016-10-13 CN CN201610894751.1A patent/CN106505304A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188325A (en) * | 1999-09-20 | 2008-05-28 | 弗拉克托斯股份有限公司 | Multi-level antenna |
| CN103151606A (en) * | 2013-02-04 | 2013-06-12 | 河北科技大学 | Nested type Koch fractal Beidou dual-frequency micro-strip antenna |
| CN104836020A (en) * | 2015-05-15 | 2015-08-12 | 广东盛路通信科技股份有限公司 | Coplanar omnidirectional horizontally polarized fractal dipole antenna |
Non-Patent Citations (1)
| Title |
|---|
| MIAOWANG ZENG.ETC: ""Fractal Loop Antenna with Novel Impedance Matching for RF Energy Harvesting"", 《7TH ASIA PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY》 * |
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Application publication date: 20170315 |