CN104701605A - Electric small-sized fractal monopole antenna - Google Patents
Electric small-sized fractal monopole antenna Download PDFInfo
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- CN104701605A CN104701605A CN201510018878.2A CN201510018878A CN104701605A CN 104701605 A CN104701605 A CN 104701605A CN 201510018878 A CN201510018878 A CN 201510018878A CN 104701605 A CN104701605 A CN 104701605A
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Abstract
The invention discloses an electric small-sized fractal monopole antenna (length-0.049. lamda c, width-0.041.lamda c, height-0.068.lamda c, and lamda c represents resonant frequency). The electric small-sized fractal monopole antenna is characterized by comprising a round metal floor and an aerial radiation body, wherein the aerial radiation body comprises radiation bodies respectively composed of circular-arc Gussie.Piano fractal curve conductors, a left inverted-L-shaped conductor section, a right inverted-L-shaped conductor section, a vertical cylindrical helix I connected to the horizontal middle section of the left inverted-L-shaped conductor section, a vertical cylindrical helix I connected to the horizontal middle section of the right inverted-L-shaped conductor section and horizontal circular rings connected to the two vertical cylindrical helixes. The left inverted-L-shaped conductor section and the right inverted-L-shaped conductor section are respectively connected with two fractal curve radiation bodies and are mutually symmetric, one circular-arc Gussie.Piano fractal curve radiation body is directly short-circuited to the metal floor, and the other circular-arc Gussie.Piano fractal curve radiation body is connected with a coaxial feeder. Ideal impedance matching, higher gain and good efficiency of the electric small-sized fractal monopole antenna are achieved, and the electric small-sized fractal monopole antenna has the advantages of being novel in concept, clear in principle, pervasive in method, easy to process and the like.
Description
Technical field
The present invention relates to communication antenna equipment technical field, particularly relate to the fractal monopole antenna of a kind of electric small-size.
Background technology
Antenna is one of most important parts in wireless communication system.Because antenna has the analogous size with operation wavelength, therefore when frequency is very low, its size is often very large, as bank is dived extremely low frequency (VLF) communication antenna, tank hyperfrequency (UHF) communication unit whip antenna etc.Miniaturized and lightweight is the target that Modern wireless communication equipment is pursued all the time, and antenna has become one of the key and bottleneck that realize this target.When in order to adapt to installing space antenna size is designed to much smaller than operation wavelength as being less than 0.1 λ even less (electronically small antenna) time, as beep-pager in-built electrical small loop antenna, antenna performance such as the indexs such as bandwidth, gain, efficiency can reduce greatly.Especially electric little dimension antenna, the usual real part R of its input impedance
avery little, imaginary part X
athen there is very large reactive component, make to mate with standard 50 Ω coaxial feeder to become very difficult.This can cause a day feedpoint impedance severe mismatch, and cause antenna-reflected loss very large, thus gain and efficiency are extremely low, such as common vehicle-mounted AM/FM broadcast antenna.In order to make up the miniaturized penalty brought, electronically small antenna loads active amplifying circuit usually, and the small-signal received by antenna to amplify after several times input processing circuit again, thus reaches the reception that nearly electric scaled antennas possesses.But active electrical miniature antenna only considers that reception is improved and do not focus on a kind of antenna of operating efficiency.If be used as transmitting antenna, the efficiency that active antenna is extremely low makes it cannot use in engineering practice, is therefore commonly used for reception antenna.
In sum, the performance of electronically small antenna be improved, first must improve its input impedance, make it close to 50 Ω, and make great efforts to fall low reactance-resistance ratio to increase bandwidth.This depends on good exquisite structural design and suitable material selection, and this is the same with the design of any other type antenna.Electronically small antenna also often adopts the method for loading lamped element as resistance, inductance and electric capacity to realize impedance matching, but the high q-factor of lamped element self and loss can cause the beamwidth of antenna and efficiency greatly to reduce.And other miniaturization methods are as geometry bending, high dielectric constant material, magnetic material etc., then can cause input impedance reduction, bandwidth narrows, gain and decrease in efficiency etc.Fractal be recent two decades since the emerging effective ways realizing antenna miniaturization, the multi resonant that it utilizes the self-similarity of fractals (self-similarity) and space filling (space-filling) to realize antenna is frequently and miniaturized.Fractal antenna can, when keeping radiation characteristic substantially constant, make physical dimension significantly reduce.But, bend the same with conventional geometry, fractal antenna realize resonance frequency significantly reduced while, its input resistance also will reduce greatly.
In view of the important antenna of a class that electronically small antenna is in engineer applied, how promoting its performance becomes an important directions in antenna research field.
Summary of the invention
Object of the present invention is intended to for UHF SHF communication provides a kind of electric small-size, omni-directional, high-gain, high efficiency mobile terminal antenna, and provides a kind of method of mating of realizing ideal with 50 Ω normal impedances for general electric small scale wire antenna.
The present invention adopts following technical solution to realize above-mentioned purpose: the fractal monopole antenna of a kind of electric small-size (long-0.049 λ
c, wide-0.041 λ
c, high-0.068 λ
c; λ
cfor resonance frequency), it is characterized in that, it comprises the circular metal floor being provided with coaxial feeding hole and coaxial line, the antenna radiator stood on metal floor.Antenna radiator comprises: respectively by two two inverted L-shaped conductor segment symmetrical through the left and right that radiant body, the respectively wire fractal with two of the periodicity circular arc Ge Xipu Piano fractal curve conductor configuration of an iteration are connected, be connected to the vertical cylindrical screw one of the inverted L-shaped conductor horizontal mid-section in left side, be connected to the vertical cylindrical screw two of the inverted L-shaped conductor horizontal mid-section on right side, and be connected to the horizontal circular ring of two vertical cylindrical screw bottoms; Wherein the direct short-circuit of a circular arc Ge Xipu Piano fractal curve radiant body is to metal floor, and another circular arc Ge Xipu Piano fractal curve radiant body is then connected with 50 Ω feeding coaxial lines.
Further illustrating as such scheme, the top of described circular arc Ge Xipu Piano fractal curve radiant body loads inverted L-shaped conductor segment, and the lower end, vertical position of inverted L-shaped conductor segment connects the top of circular arc Ge Xipu Piano fractal curve radiant body.
The fractal monopole antenna of a kind of electric small-size, it is characterized in that, its set-up mode comprises the following steps:
Step one is W at XOZ planar configuration width
i, horizontal length is L
0be I with iterations
ige Xipu Piano Planar Fractal curve (Guiseppe Peano Curve), each iteration I
ihorizontal length l
iwith vertical height m
iratio be δ
i=l
i/ m
i(i is iterations I
i);
Step 2, under rectangular coordinate system, according to method described in step one, is W with diameter
1wire configurations iteration I
1circular arc Ge Xipu Piano Spatial Fractal curve, its horizontal segment and vertical section are respectively arc section and straightway, and arc radius and radian are respectively R
0with
Step 3, according to method described in step 2, constructs N bar iteration I successively along+Z-direction
1circular arc Ge Xipu Piano fractal curve; Then, these unit fractal curves are joined end to end, form longer, a western general Piano fractal curve of cycle personality; Its vertical height H equals the summation of each cell height and initial segment height, i.e. H=l
0+ (2N+1) l
1(N is number of unit, N>=1);
Step 4, the N unit periodicity fractal curve in step 3 is carried out image copying along YOZ plane, and copying rear left and right two parts (X-axis bears/positive axis part) spacing distance is s;
Step 5, two Spatial Fractal curve ends (top) described in step 4 load two identical inverted L-shaped conductor segment respectively, and its leading portion vertical portion height is l
1, back segment horizontal component is long is l;
Step 6, the end of two inverted L-shaped conductor horizontal segments described in step 5 loads a length and width, thick L respectively respectively
p, W
p, T
pfor vertical conductor plate, two conductor plate spacing distances are (s-T
p); Step 7, in the middle of two inverted L-shaped conductor horizontal segments described in step 5, partially vertically fragment position loads a vertical cylindrical screw respectively, and screw diameter, lift angle and wire diameter are respectively D
h, α
h, W
h, rotation direction is left-handed or dextrorotation;
Step 8, is respectively D by the cylindrical screw bottom of two described in step 7 a diameter and wire diameter
land W
lannulus connect, tie point is positioned in the horizontal diameter of annulus;
Step 9, places a metal floor at antenna lower horizontal, metal floor upper surface with described in step 4+the western general Piano fractal curve top of N unit cycle personality of X-axis part is concordant;
Step 10, the circular metal floor described in step 9 and fractal curve top flush position bore a circular hole, and aperture equals 50 Ω standard coaxial line outer conductor internal diameter D
c, at the coaxial connector of this hole place mounting strap ring flange, as SMA type, N-type, BNC type, TNC type head;
Step 11, by described in step 4-the western general Piano fractal curve end of X-axis part N unit cycle personality is then shorted to metal floor.
Further illustrating as such scheme, the fractal curve type that the little fractal monopole antenna of electricity is selected is an iteration Ge Xipu Piano fractal curve I
1.
Preferably, the little fractal monopole antenna of electricity adopts space circular arc but not an iteration Ge Xipu Piano fractal curve I of planar fold form
1realize antenna size more significant miniaturized.
Preferably, the little fractal monopole antenna of electricity adopts two-arm form that is symmetrical, that amount to double to realize impedance.
Preferably, the desired impedance coupling under the little fractal monopole antenna of described electricity adopts the method for distributed capacitor inductance loaded in series to realize electric small-size.
Preferably, the making material of iteration Ge Xipu Piano fractal curve is width is W
iprinted conductor or diameter be D
iplain conductor.
Preferably, described metal floor shape is circular, oval, square or regular polygon.
Preferably, the electricity fractal curve of little fractal monopole antenna, the cylindrical screw inductance of loading and metal floor adopts copper, aluminium or stainless steel material to make.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is:
The method that the present invention adopts fractals and distributed circuit to combine uniquely, makes conventional hyperfrequency uhf band monopole antenna only rely on exquisite structural design in broad frequency band, namely achieve electric small-size work (< < 0.1 λ; Long-0.049 λ
c, wide-0.041 λ
c, high-0.068 λ
c; λ
cfor resonance frequency); Band internal impedance coupling is good, direction omni-directional is good, gain and efficiency higher; Especially resonance point, its input impedance is no better than 50 Ω, and gain and efficiency are respectively up to 1.5dBi and 95%.Simultaneously, the advantages such as feature such as the present invention has clear thinking, principle is pervasive, structure is simple, easy to process, make original, the simplest, the most most widely used antenna type in this field of antenna of list/dipole antenna can be applied to extremely low, ultralow frequency range, thus further expand its application; Moreover electricity proposed by the invention little monopole antenna matching process is equally also applicable to the coupling of the little wire antenna of other types electricity.
Accompanying drawing explanation
The rectangular coordinate system definition schematic diagram that Fig. 1 adopts for antenna model;
Fig. 2 is each iteration plane Ge Xipu Piano fractal curve (Guiseppe Peano Curve) schematic diagram; Fig. 2 (a) represents just initial body or zero degree iteration I
0, Fig. 2 (b) represents an iteration I
1, Fig. 2 (c) represents second iteration I
2, Fig. 2 (d) represents three iteration I
3;
Fig. 3 is an iteration I
1space circular arc Ge Xipu Piano fractal curve (Guiseppe Peano Curve) schematic diagram; Fig. 3 (a) represents right view, and Fig. 3 (b) represents front view (front view), and Fig. 3 (c) represents end view;
Fig. 4 (a) is N=3 unit iteration I1 periodic spatial circular arc Ge Xipu Piano fractal curve (Guiseppe Peano Curve) schematic diagram; Fig. 4 (a) represents front view (front view), and Fig. 4 (b) represents stereogram;
Fig. 5 is N=3 unit iteration I
1periodic spatial circular arc Ge Xipu Piano fractal curve (Guiseppe Peano Curve) is about YOZ plane specular schematic diagram; Fig. 5 (a) represents end view, and Fig. 5 (b) represents front view (front view), and Fig. 5 (c) represents vertical view;
Fig. 6 is N=3 unit iteration I
1the inverted L-shaped conductor segment schematic diagram that after about periodic spatial circular arc Ge Xipu Piano fractal curve (Guiseppe Peano Curve) specular, top loads; Fig. 6 (a) represents inverted L-shaped conductor segment front view (front view), and Fig. 6 (b) represents inverted L-shaped conductor segment vertical view;
Fig. 7 is that symmetrical two inverted L-shaped conductor segment mesophase spherule neighboring terminals load vertical conductor plate schematic diagram respectively; Fig. 7 (a) represents vertical conductor plate right view, Fig. 7 (b) represents vertical conductor plate front view (front view), Fig. 7 (c) represents vertical conductor plate and inverted L-shaped conductor segment assembly front view (front view), Fig. 7 (d) represents vertical conductor plate and inverted L-shaped conductor segment assembly vertical view, and Fig. 7 (e) represents vertical conductor plate and inverted L-shaped conductor segment assembly end view;
Fig. 8 is that two inverted L-shaped conductor horizontal segment centre positions load vertical cylindrical screw and two cylindrical screw bottom annulus connection diagrams respectively, Fig. 8 (a) represents vertical cylindrical screw front view (front view), Fig. 8 (b) represents vertical cylindrical screw end view, Fig. 8 (c) represents connection annulus vertical view, Fig. 8 (d) represents connection annulus front view (front view), Fig. 8 (e) represents inverted L-shaped conductor, vertical conductor plate, vertical cylindrical screw and bottom thereof connect the assembly front view (front view) of circle, Fig. 8 (f) represents inverted L-shaped conductor, vertical conductor plate, vertical cylindrical screw and bottom thereof connect the assembly vertical view of circle, Fig. 8 (g) represents inverted L-shaped conductor, vertical conductor plate, vertical cylindrical screw and bottom thereof connect the assembly end view of circle,
Fig. 9 is the circular floor schematic diagram of band power feed hole and coaxial line; Fig. 9 (a) represents circular floor vertical view, and Fig. 9 (b) represents circular floor front view (front view);
Figure 10 is the fractal monopole antenna overall schematic of electric small-size after each several part combination; Figure 10 (a) represents fractal monopole antenna vertical view, Figure 10 (b) represents fractal monopole antenna front view (front view), Figure 10 (c) represents fractal monopole antenna right view, and Figure 10 (d) represents fractal monopole antenna end view;
Figure 11 is the input impedance Z of the fractal monopole antenna of electric small-size
infrequency characteristic figure;
Figure 12 is the reflection coefficient of the fractal monopole antenna of electric small-size | S
11| curve;
Figure 13 is the real gain G frequency characteristics of the fractal monopole antenna of electric small-size;
Figure 14 is the efficiency eta of the fractal monopole antenna of electric small-size
afrequency characteristics;
Figure 15 is that the fractal monopole antenna of electric small-size is at f
lthe real gain pattern (G=-3.42dBi) of 2D of=424.00MHz;
Figure 16 is that the fractal monopole antenna of electric small-size is at f
lthe real gain pattern (G=1.524dBi) of 2D of=428.76MHz;
Figure 17 is that the fractal monopole antenna of electric small-size is at f
lthe real gain pattern (G=-3.32dBi) of 2D of=432MHz.
Description of reference numerals: 1, coaxial feeding hole 2, coaxial line 3, metal floor 4, antenna body 4-1, fractal curve radiant body 4-2, left side inverted L-shaped conductor segment 4-3, right side inverted L-shaped conductor 4-4, vertically cylindrical screw one 4-5, vertically cylindrical screw two 4-6, level connection joint annulus 4-7, the vertical section of inverted L-shaped conductor.
Embodiment
The present invention is a kind of fractal monopole antenna of electric small-size (long-0.049 λ working in uhf band
c, wide-0.041 λ
c, high-0.068 λ
c, λ
cfor resonance frequency), it comprises the circular metal floor 3 being provided with coaxial feeding hole 1 and coaxial line 2, stand on the antenna body 4 on metal floor 3, antenna body 4 comprises respectively by the radiant body 4-1 of the periodicity circular arc Ge Xipu Piano fractal curve conductor configuration of two iteration, two inverted L-shaped conductor segment 4-2 that the left and right be connected with two fractal curve radiant bodies is respectively symmetrical, 4-3, be connected to vertical cylindrical screw one 4-4 of left side inverted L-shaped conductor horizontal mid-section, be connected to vertical cylindrical screw two 4-5 of right side inverted L-shaped conductor horizontal mid-section, and be connected to the horizontal circular ring 4-6 of two vertical cylindrical screw bottoms, wherein a circular arc Ge Xipu Piano fractal curve radiant body is short-circuited to metal floor 3, another circular arc Ge Xipu Piano fractal curve radiant body is connected with coaxial feeder 2.The top of circular arc Ge Xipu Piano fractal curve radiant body loads inverted L-shaped conductor segment, and the vertical section 4-7 lower end of inverted L-shaped conductor segment connects the top of circular arc Ge Xipu Piano fractal curve radiant body.
Below in conjunction with specific embodiment, specific embodiment of the invention scheme is described in further detail.
Here, will based on an iteration I
1space circular arc Ge Xipu Piano fractal curve (Guiseppe Peano Curve) designs the fractal monopole antenna of electric small-size, and the present invention is described in detail to provide respective drawings.It should be noted that, preferred embodiment as described herein, only for instruction and explanation of the present invention, is not limited to or limits the present invention.
The fractal monopole antenna set-up mode of electric small-size of the present invention, it comprises the following steps:
Step one, first sets up rectangular coordinate system in space (cartesian coordinate system), as shown in Figure 1.
Step 2 is W in XOZ plane demonstration live width
i, horizontal segment length l
iwith vertical segment length m
iratio be δ
i=l
i/ m
i(i is iterations I
i), horizontal total length is L
0each iteration Ge Xipu Piano fractal curve I
iconstruction process, as shown in Figure 2.
Step 3, under rectangular coordinate system in space, is W by wire diameter
1wire configurations iteration space circular arc Ge Xipu Piano fractal curve unit I
1.Wherein, arc radius and radian are respectively R
0with
as shown in Figure 3.
Step 4, the western general Piano fractal curve I of the unit that step 3 is constructed
1become an end to end N unit periodically fractal curve, as shown in Figure 4.
Step 5, carries out image copying by the N unit of step 4 periodicity fractal curve along YOZ plane, and copying rear left and right two parts (X-axis bears/positive axis part) spacing distance is s, as shown in Figure 5.
Step 6, two of step 5 periodically fractal curve tops load two identical inverted L-shaped conductor segment respectively, its leading portion vertical portion height is l
1, back segment horizontal component is long is l, as shown in Figure 6.
Step 7, two inverted L-shaped conductor horizontal segment ends described in step 6 load a length and width, thick L respectively respectively
p, W
p, T
pfor vertical conductor plate, two conductor plate spacing are (s-T
p), as shown in Figure 7.
Step 8, in the middle of two inverted L-shaped conductor horizontal segments described in step 7, partially vertically fragment position loads a vertical cylindrical screw respectively, and screw diameter, lift angle and wire diameter are respectively D
h, α
h, W
h, rotation direction is left-handed or dextrorotation, as shown in Fig. 8 (a)-(b), 8 (e)-(g).
Step 9, is respectively D by the cylindrical screw bottom of two described in step 8 a diameter and wire diameter
land W
lhorizontal circular ring connect, tie point is positioned in the horizontal diameter of annulus, as shown in Fig. 8 (c)-(g).
Step 10, places a diameter and thickness is respectively D at antenna lower horizontal
gand T
gcircular metal floor, as shown in Figure 9.Floor upper surface with described in step 5+the western general Piano fractal curve top of N unit cycle personality of X-axis part is concordant, as shown in Figure 10 (a)-(d).
Step 11, the circular floor described in step 10 and fractal curve top flush position bore a circular hole, and aperture equals coaxial outer conductor diameter D
c, as shown in Figure 10 (a)-(d).
Step 12, by described in step 5-the western general Piano fractal curve end of X-axis part N unit cycle personality is then shorted to circular metal plate, as shown in Figure 10 (b)-(d).
The present invention is directed to electric little dimension antenna is the important antenna type of one in engineering practice, but its input impedance is extremely low is difficult to coupling, very high bandwidth is very narrow, efficiency is extremely low for Q value, cause its application potential this present situation greatly limited, author proposes and adopts western general Piano fractal curve (Guiseppe Peano Curve) to amount to mode and distributed inductance, capacitive load method, achieves electric small-size monopole antenna in broad frequency band, achieves desired impedance coupling.Shown in composition graphs 11-Figure 17, Tu11Zhong, transverse axis (X-axis) is frequency f, and unit is MHz; The longitudinal axis (Y-axis) is input impedance Z
in, unit is Ω; Solid line represents real part R
in, dotted line represents imaginary part X
in; Known by figure, monopole resonance is in f
c=428.754MHz, impedance is Z
in=R
in=50 Ω, obviously, this resonance point can reach perfect match.
Figure 12 is the reflection coefficient of the fractal monopole antenna of electric small-size | S
11| curve.Wherein, transverse axis (X-axis) is frequency f, and unit is MHz; The longitudinal axis (Y-axis) is reflectance magnitude | S
11|, unit is dB.Resonance point f
cthe reflectance magnitude of=428.754MHz | S
11| reach-51dB.| S
11bandwidth BW=3.37MHz that |=-5dB is corresponding, relative bandwidth about 0.8%.
Figure 13 is the real gain G frequency characteristics of the fractal monopole antenna of electric small-size.Wherein, transverse axis (X-axis) is frequency f, and unit is MHz; The longitudinal axis (Y-axis) is the real gain G of antenna, and unit is dBi.Resonance point f
creal gain G=the 1.53dBi of=428.754MHz.| S
11real gain G >-1dBi in |=-5dB is with; Bandwidth BW=8MHz that real gain G >-4dBi is corresponding, relative bandwidth about 1.87%.
Figure 14 is the efficiency eta of the fractal monopole antenna of electric small-size
afrequency characteristics.Wherein, transverse axis (X-axis) is frequency f, and unit is MHz; The longitudinal axis (Y-axis) is antenna efficiency η
a, unit is %.Resonance point f
cthe antenna efficiency η of=428.754MHz
aclose to 100%.| S
11|=-5dB is with internal antenna efficiency eta
a>50%; Real gain G >-4dBi is with internal antenna efficiency eta
a>25%.
Figure 15 is that the fractal monopole antenna of electric small-size is at f
lthe real gain pattern (G=-3.42dBi) of 2D of=424.00MHz.Wherein, solid line is main polarization component Co-Pol, and dotted line is cross polar component X-Pol; Thick line represents H-face (XOY plane); Fine rule represents E-face (XOZ plane).
Figure 16 is that the fractal monopole antenna of electric small-size is at f
lthe real gain pattern (G=1.524dBi) of 2D of=428.76MHz.Wherein, solid line is main polarization component Co-Pol, and dotted line is cross polar component X-Pol; Thick line represents H-face (XOY plane); Fine rule represents E-face (XOZ plane).
Figure 17 is that the fractal monopole antenna of electric small-size is at f
lthe real gain pattern (G=-3.32dBi) of 2D of=432MHz.Wherein, solid line is main polarization component Co-Pol, and dotted line is cross polar component X-Pol; Thick line represents H-face (XOY plane); Fine rule represents E-face (XOZ plane).
Result of study shows, this electronically small antenna in the relative bandwidth of 1.87%, gain G >-4dBi, effective antenna efficiency eta
a>25%, resonance point gain is up to 1.52dBi, and efficiency is close to 100%.Meanwhile, this electric little monopole also has good omnidirectional's directivity and lower cross polarization level.By contrast, other lump loaded type electronically small antennas are all much inferior in efficiency, gain and bandwidth.In addition, this invention has principle novelty, applicable antenna is wide, structure simple, design the advantages such as easy, easy to process.Finally, institute of the present invention extracting method is also applicable to the electric small-size perfect match of other types wire antenna, as dipole, loop antenna, rhombic aerial etc.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (10)
1. the fractal monopole antenna of electric small-size, it is characterized in that, it comprises the metal floor being provided with coaxial feeding hole and coaxial line, stand on the antenna radiator on metal floor, antenna radiator comprises respectively by the radiant body of the space circular arc Ge Xipu Piano fractal curve conductor configuration of two iteration, symmetrical two the inverted L-shaped conductor segment in the left and right be connected with two fractal curve radiant bodies respectively, be connected to the vertical cylindrical screw one of left side inverted L-shaped conductor horizontal mid-section, be connected to the vertical cylindrical screw two of right side inverted L-shaped conductor horizontal mid-section, and be connected to the horizontal circular ring of two vertical cylindrical screw bottoms, wherein the direct short-circuit of a circular arc Ge Xipu Piano fractal curve radiant body is to metal floor, another circular arc Ge Xipu Piano fractal curve radiant body is connected with coaxial feeder.
2. the fractal monopole antenna of a kind of electric small-size according to claim 1, it is characterized in that, the top of described circular arc Ge Xipu Piano fractal curve radiant body loads inverted L-shaped conductor segment, and the vertical section lower end of inverted L-shaped conductor segment connects the top of circular arc Ge Xipu Piano fractal curve radiant body.
3. the fractal monopole antenna of electric small-size as claimed in claim 1 or 2, is characterized in that, its set-up mode comprises the following steps:
Step one is W at XOZ planar configuration width
i, horizontal length is L
0be I with iterations
ige Xipu Piano Planar Fractal curve, each iteration I
ihorizontal length l
iwith vertical height m
iratio be δ
i=l
i/ m
i, i is iterations I
i;
Step 2, under rectangular coordinate system, according to method described in step one, is W with diameter
1wire configurations iteration I
1circular arc Ge Xipu Piano Spatial Fractal curve, its horizontal segment and vertical section are respectively arc section and straightway, and arc radius and radian are respectively R
0with
Step 3, according to method described in step 2, constructs N bar iteration I successively along+Z-direction
1circular arc Ge Xipu Piano fractal curve; Then, these unit fractal curves are joined end to end, form longer, a western general Piano fractal curve of cycle personality; Its vertical height H equals the summation of each cell height and initial segment height, i.e. H=l
0+ (2N+1) l
1, N is number of unit, N>=1;
Step 4, the N unit periodicity fractal curve in step 3 is carried out image copying along YOZ plane, copies rear left and right two parts, be respectively negative half shaft portion of X-axis and X-axis positive axis part, two parts spacing distance is s;
Step 5, two Spatial Fractal curve ends described in step 4 load two identical inverted L-shaped conductor segment respectively, and its leading portion vertical portion height is l
1, back segment horizontal component is long is l;
Step 6, the end of two inverted L-shaped conductor horizontal segments described in step 5 loads a length and width, thick L respectively respectively
p, W
p, T
pfor vertical conductor plate, two conductor plate spacing distances are s-T
p; Step 7, in the middle of two inverted L-shaped conductor horizontal segments described in step 5, partially vertically fragment position loads a vertical cylindrical screw respectively, and screw diameter, lift angle and wire diameter are respectively D
h, α
h, W
h, rotation direction is left-handed or dextrorotation;
Step 8, is respectively D by the cylindrical screw bottom of two described in step 7 a diameter and wire diameter
land W
lannulus connect, tie point is positioned in the horizontal diameter of annulus;
Step 9, places a metal floor at antenna lower horizontal, metal floor upper surface with described in step 4+the western general Piano fractal curve top of N unit cycle personality of X-axis part is concordant;
Step 10, the circular metal floor described in step 9 and fractal curve top flush position bore a circular hole, and aperture equals 50 Ω standard coaxial line outer conductor internal diameter D
c, at the coaxial connector of this hole place mounting strap ring flange;
Step 11, is then shorted to metal floor by negative for the X-axis described in the step 4 western general Piano fractal curve end of half shaft portion N unit cycle personality.
4. the fractal monopole antenna of a kind of electric small-size according to claim 3, is characterized in that, the fractal curve type that the little fractal monopole antenna of electricity is selected is an iteration Ge Xipu Piano fractal curve I
1.
5. the fractal monopole antenna of a kind of electric small-size according to claim 3, is characterized in that, the little fractal monopole antenna of electricity adopts space circular arc but not an iteration Ge Xipu Piano fractal curve I of planar fold form
1realize the miniaturization of antenna size.
6. the fractal monopole antenna of a kind of electric small-size according to claim 3, is characterized in that, the little fractal monopole antenna of electricity adopts two-arm form that is symmetrical, that amount to double to realize impedance.
7. the fractal monopole antenna of a kind of electric small-size according to claim 3, is characterized in that, the desired impedance that the little fractal monopole antenna of described electricity adopts distributed capacitor, the method for inductance loaded in series realizes under electric small-size is mated.
8. the fractal monopole antenna of a kind of electric small-size according to claim 3, is characterized in that, the making material of iteration Ge Xipu Piano fractal curve is width is W
iprinted conductor or diameter be D
iplain conductor.
9. the fractal monopole antenna of a kind of electric small-size according to claim 3, is characterized in that, described metal floor shape is circular, oval, square or regular polygon.
10. the fractal monopole antenna of a kind of electric small-size according to claim 3, is characterized in that, the electricity fractal curve of little fractal monopole antenna, the cylindrical screw inductance of loading and metal floor adopt copper, aluminium or stainless steel material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510018878.2A CN104701605B (en) | 2015-01-14 | 2015-01-14 | A kind of electric small-size point shape monopole antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510018878.2A CN104701605B (en) | 2015-01-14 | 2015-01-14 | A kind of electric small-size point shape monopole antenna |
Publications (2)
| Publication Number | Publication Date |
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| CN104701605A true CN104701605A (en) | 2015-06-10 |
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| CN107785653A (en) * | 2017-11-29 | 2018-03-09 | 中国电子科技集团公司第五十四研究所 | A kind of screw type element antenna |
| CN111082200A (en) * | 2019-12-31 | 2020-04-28 | 重庆品胜科技有限公司 | Polarization-reconfigurable-based electric small yagi RFID antenna |
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| CN104701605B (en) | 2017-11-03 |
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