CN109037924A - A kind of H-shaped feed terminal double frequency plane slot antenna loading gap ring - Google Patents
A kind of H-shaped feed terminal double frequency plane slot antenna loading gap ring Download PDFInfo
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- CN109037924A CN109037924A CN201810704012.0A CN201810704012A CN109037924A CN 109037924 A CN109037924 A CN 109037924A CN 201810704012 A CN201810704012 A CN 201810704012A CN 109037924 A CN109037924 A CN 109037924A
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- 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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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Abstract
The invention discloses a kind of H-shaped feed terminal double frequency plane slot antennas for loading gap ring, are made of medium substrate, the load gap ring, H-shaped feed terminal, rectangle coplanar waveguide feeder line, the wide gap floor of rectangle and the external coaxial fitting that are printed on medium substrate.The size for adjusting H-shaped feed terminal can improve the frequency response of antenna high band.Load gap ring is introduced in H-shaped feed terminal surrounding, certain resonance size can be obtained in limited range, the volume of antenna is further decreased, and the energy of H-shaped feed terminal can be coupled, adjusts the frequency response of low-frequency range.Increase rectangular preiection above the wide gap floor of rectangle, thus it is possible to vary antenna surface current path makes have good isolation between each frequency band to increase resonance point.The present invention has dual-band characteristic, and antenna structure is simple, and easy to process, the radiation characteristic and gain characteristic of each frequency range are good, is suitable for WiMAX, WLAN frequency range small multiple band wireless communication system.
Description
Technical field
The present invention relates to radio antenna technical fields, and in particular to a kind of H-shaped feed terminal for loading gap ring is double
Frequency planar slot antenna is suitable for WiMAX, WLAN frequency range small multiple band wireless communication system.
Background technique
With modern wireless communication systems towards miniaturization, system integration direction develop, limited frequency spectrum resource at
To limit the principal contradiction that it develops, the interference problem between each communication system is also increasingly prominent, needs to design a kind of antenna
Multiple frequency bands are covered, to increase the compatibility of system, multifrequency antenna generates in this context.Such antenna can be by multiple days
The function of line integrates, and provides service for the communication system of different frequency range, to reduce the size and number of antenna, is convenient for
The miniaturization of wireless communication system and Integration Design, therefore, multiband antenna have boundless application prospect.Antenna feed
The antenna section of electric terminals and floor antarafacial is bigger, is not suitable for communication equipment Miniaturization Design, therefore, current feed terminal and floor
Coplanar antenna is the emphasis that we pay close attention to.Slot antenna multi-frequency Characteristic easy to accomplish and have good isolation, gap
Antenna is that a wider gap is opened on floor, and gap structure generally uses approximate rectangular or circular gap, radiation and feedback
Electric structure is similar with monopole antenna, and wide gap is combined with coplanar wave guide feedback, using the combination physical efficiency of particular geometries
Wider impedance bandwidth is enough obtained, multifrequency or trap characteristic can also be realized by loading resonance minor matters or introducing special construction.Rationally
Design feed element can obtain wider impedance bandwidth, fluting can change antenna surface electric current point on current feed terminal
Cloth increases the resonance point in frequency range, and the additional patches for increasing a quarter operation wavelength around current feed terminal can produce
Raw reversed condition resonant relationship uses bending type current feed terminal with spreading antenna bandwidth and can reduce antenna volume.It is feeding
It is the most direct method for realizing multi-frequency Characteristic that resonance structure is introduced in terminal or floor, and non-patent literature 1, which discloses one kind, to be had
The three frequency band dual polarization plane monopole antennas on asymmetric ground and load stake, two inverted L-shaped slots have been opened on current feed terminal, have been made
Three different resonance minor matters are formed on current feed terminal, to realize multi-band property.Non-patent literature 2 discloses a kind of terminal and opens
The double square plane of a loop printed antenna on road, is composed of, single minor matters can inspire specific medianly zygomorphic minor matters
The electric field of frequency, rationally adjusts the length of resonance minor matters and the size of controlling terminal open-circuit position can produce specific frequency and ring
It answers, generates multi-band.Above-mentioned antenna is although owned by cleverly design and structure is all relatively new, but these antenna
Perhaps size is larger or the bandwidth relative narrower of each frequency band.In conclusion co-planar waveguide slot antenna has, size is small, cuts open
Face is low, the processing is simple, easily with the advantages that carrier is conformal, multi-frequency Characteristic easy to accomplish, and based on wireless communication system lightweight,
Integrated growth requirement makes co-planar waveguide slot antenna have great application prospect and extensive social demand.It is current logical
Believe that demand of the integrated multi-functional of equipment to multiband antenna highlights, multifrequency antenna has become most important in communication equipment
Part, small design, multiband antenna at low cost have become the trend and hot spot of current research.
Citation list
Non-patent literature 1: Tan Mingtao, broadband and multi-band planar antenna are studied, Beijing Jiaotong University Ph.D. Dissertation,
2016:76-85.
Non-patent literature 2: Li Bo, multiband/super wide band plane printed antenna and continuous tangential section aerial array research, west
Pacify University of Electronic Science and Technology Ph.D. Dissertation, 2013:31-35.
Summary of the invention
The object of the present invention is to provide a kind of H-shaped feed terminal double frequency plane slot antennas for loading gap ring, have double
Frequency bandwidth characteristics, radiation characteristic is good, bandwidth, size are small, gain stabilization, convenient for integrated or conformal with carrier, can meet simultaneously
The requirement of 3.5GHzWiMAX, 5GHz WLAN frequency range to bandwidth of operation.
The technical scheme is that a kind of H-shaped feed terminal double frequency plane slot antenna for loading gap ring, by medium
Substrate (1), the load gap ring (2) being printed on medium substrate (1), H-shaped feed terminal (3), rectangle coplanar waveguide feeder line
(4), the wide gap floor (5) of rectangle and external coaxial fitting (6) are constituted, it is characterised in that:
A. the load gap ring (2) is located at around H-shaped feed terminal (3), protects with H-shaped feed terminal (3) outer edge
Certain distance is held, surrounding is bent along H-shaped current feed terminal (3), and load gap ring (2) couples energy by H-shaped feed terminal (3)
Amount can adjust the frequency response of low-frequency range, and certain resonance can be obtained in limited range by introducing load gap ring (2)
Size further decreases the volume of antenna, and the positions and dimensions for rationally adjusting load gap ring (2) can generate specific frequency
Response, realizes the multi-band of antenna；
B. the H-shaped feed terminal (3) combines shape by three left side rectangle, intermediate rectangular, right rectangular rectangular patches
At H-shaped, intermediate rectangular lower end is connected with coplanar waveguide feeder line (4), and intermediate rectangular two sides are separately connected left side rectangle and right side
Rectangle adjusts the frequency response of the adjustable antenna high band of size of H-shaped feed terminal (3)；
C. the rectangle coplanar waveguide feeder line (4) is the rectangle conduction band that one section of characteristic impedance is 50 Ω, the coplanar wave of rectangle
The upper end for leading feeder line (4) is connected with the center lower end of H-shaped current feed terminal (3), and the lower end of rectangle coplanar waveguide feeder line (4) is external
Coaxial fitting (6), the width for adjusting coplanar waveguide feeder line (4) can further adjust the impedance matching of antenna, broaden antenna
Impedance bandwidth；
D. the wide gap floor (5) of rectangle extends conduction band, upside closure conduction band and upside square by rectangle floor, left and right
Shape protrusion composition, rectangle floor, left and right form the wide gap of rectangle after extending conduction band, upside closure conduction band combination, with adjusting rectangle
The impedance matching of the adjustable antenna low-frequency range of the size of plate, middle position increases rectangle above the wide gap floor (5) of rectangle
Protrusion, thus it is possible to vary antenna surface current path makes have good isolation between each frequency band to increase resonance point；
E. the coaxial fitting (6) is located on the central axis of medium substrate (1) lower end, coaxial fitting (6) respectively with rectangle
Coplanar waveguide feeder line (4) is connected with two lower edges of the wide gap floor (5) of rectangle.
The load gap ring (2) is located at around H-shaped feed terminal (3), load gap ring (2) upside and H-shaped feed
The width a in gap is 1mm~2mm between terminal (3), loads and stitches between gap ring (2) rest part and H-shaped feed terminal (3)
The width b of gap is 0.5mm~0.7mm, the long L of gap ring minor matters 75For 3.4mm~3.8mm, 7 width W of gap ring minor matters5For 0.8mm~
1.2mm, the long L of gap ring minor matters 84For 0.8mm~1.2mm, 8 width W of gap ring minor matters4For 4.9mm~5.5mm, gap ring minor matters 9
Long L8For 9.5mm~10.1mm, 9 width W of gap ring minor matters6For 0.4mm~0.8mm, the long L of gap ring minor matters 1011For 0.8mm~
1.2mm, 10 width W of gap ring minor matters10For 2.9mm~3.3mm, the long L of gap ring minor matters 1110For 2.8mm~3.2mm, gap ring branch
Save 11 width W11For 7.0mm~7.4mm, distance L of ring (2) lower end in gap away from medium substrate lower end is loaded2For 11.5mm~
11.9mm loads the distance W at gap ring (2) inner rectangular coplanar waveguide feeder line (4) edge3For 1mm~1.4mm.
The H-shaped feed terminal (3) is combined by three left side rectangle, intermediate rectangular, right rectangular rectangular patches and is formed H
Shape, left side rectangle length L7For 7.4mm~7.8mm, left side rectangle width W9For 1.8mm~2.2mm, intermediate rectangular length L6For
1.8mm~2.2mm, intermediate rectangular width W8×2+W2Size for 8mm~8.4mm, right rectangular is identical as left side rectangle.
The rectangle conduction band length L that characteristic impedance in the rectangle coplanar waveguide feeder line (4) is 50 Ω1For 15.8mm~
16.4mm, width W2For 2.4mm~2.8mm.
The wide gap floor (5) of the rectangle extends conduction band, upside closure conduction band and upside rectangle by rectangle floor, left and right
Protrusion composition, the long L on rectangle floor3For 8.9mm~9.5mm, the wide W on rectangle floor1For 12.7mm~13.1mm, left and right extends
The long L of conduction band9For 17.2mm~17.6mm, left and right extends the wide W of conduction band7For 2.3mm~2.7mm, the length of upside rectangular preiection
L12For 2.8mm~3.2mm, the wide W of upside rectangular preiection12For 13.5mm~14.5mm.
Effect of the invention is that: the present invention devises the H-shaped feed terminal of structure novel, adjusts H-shaped feed terminal
Size can improve the frequency response of antenna high band.Load gap ring is introduced in H-shaped feed terminal surrounding, it can be limited
Certain resonance size is obtained in range, further decreases the volume of antenna, and can couple the energy of H-shaped feed terminal,
The frequency response of low-frequency range is adjusted, the positions and dimensions for rationally adjusting load gap ring can generate specific frequency response, real
The multi-band of existing antenna.Increase rectangular preiection above the wide gap floor of rectangle, thus it is possible to vary antenna surface current path
To increase resonance point, and make that there is good isolation between each frequency band.Design size of the present invention is 30mm × 30mm, tool
There is dual-band characteristic, working frequency range is 3.11GHz~3.92GHz, 4.81GHz~6.25GHz, and antenna structure is simple, processing side
Just, the radiation characteristic of each frequency range and gain characteristic are good, are suitable for WiMAX, WLAN frequency range small multiple band wireless communication system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Fig. 2 is the long L of gap ring minor matters 75To antenna reflection coefficient S11Influence.
Fig. 3 is rectangle length L on the left of H-shaped feed terminal7To antenna reflection coefficient S11Influence.
Fig. 4 is the long L of rectangular preiection on the upside of the wide gap floor of rectangle12, width W12To antenna reflection coefficient S11Influence.
Fig. 5 is actual measurement of embodiment of the present invention reflection coefficient S11Curve is compared with simulation value.
Fig. 6 is E face and H surface radiation directional diagram of the embodiment of the present invention when frequency is 3.49GHz.
Fig. 7 is E face and H surface radiation directional diagram of the embodiment of the present invention when frequency is 5.55GHz.
Fig. 8 is peak gain figure of the embodiment of the present invention in different frequency point.
Specific embodiment
A specific embodiment of the invention is: as shown in Figure 1, a kind of H-shaped feed terminal double frequency plane for loading gap ring
Slot antenna, by medium substrate (1), the load gap ring (2) being printed on medium substrate (1), H-shaped feed terminal (3), rectangle
The wide gap floor (5) of coplanar waveguide feeder line (4), rectangle and external coaxial fitting (6) are constituted, it is characterised in that: described adds
It carries gap ring (2) to be located at around H-shaped feed terminal (3), keeps certain distance with H-shaped feed terminal (3) outer edge, presented along H-shaped
Electric terminals (3) surrounding is bent, and load gap ring (2) couples energy by H-shaped feed terminal (3), can adjust low-frequency range
Frequency response, introduce load gap ring (2) certain resonance size can be obtained in limited range, further decrease day
The volume of line, the positions and dimensions for rationally adjusting load gap ring (2) can generate specific frequency response, realize the more of antenna
Frequency bandwidth characteristics；The H-shaped feed terminal (3) is combined and is formed by three left side rectangle, intermediate rectangular, right rectangular rectangular patches
H-shaped, intermediate rectangular lower end are connected with coplanar waveguide feeder line (4), and intermediate rectangular two sides are separately connected left side rectangle and right side square
Shape adjusts the frequency response of the adjustable antenna high band of size of H-shaped feed terminal (3)；The rectangle co-planar waveguide feedback
Line (4) is the rectangle conduction band that one section of characteristic impedance is 50 Ω, the upper end and H-shaped current feed terminal (3) of rectangle coplanar waveguide feeder line (4)
Center lower end be connected, the external coaxial fitting in lower end (6) of rectangle coplanar waveguide feeder line (4), adjust coplanar waveguide feeder line (4)
Width can further adjust the impedance matching of antenna, broaden the impedance bandwidth of antenna；The wide gap floor (5) of the rectangle
By rectangle floor, left and right extend conduction band, upside closure conduction band and upside rectangular preiection form, rectangle floor, left and right extend conduction band,
Upside forms the wide gap of rectangle after being closed conduction band combination, adjusts the impedance of the adjustable antenna low-frequency range of size on rectangle floor
Match, middle position increases rectangular preiection above the wide gap floor (5) of rectangle, thus it is possible to vary antenna surface current path is to increase
Add resonance point, and makes that there is good isolation between each frequency band；The coaxial fitting (6) is located under medium substrate (1)
It holds on central axis, coaxial fitting (6) is following with two of rectangle coplanar waveguide feeder line (4) and the wide gap floor (5) of rectangle respectively
Edge is connected.
The load gap ring (2) is located at around H-shaped feed terminal (3), load gap ring (2) upside and H-shaped feed
The width a in gap is 1mm~2mm between terminal (3), loads and stitches between gap ring (2) rest part and H-shaped feed terminal (3)
The width b of gap is 0.5mm~0.7mm, the long L of gap ring minor matters 75For 3.4mm~3.8mm, 7 width W of gap ring minor matters5For 0.8mm~
1.2mm, the long L of gap ring minor matters 84For 0.8mm~1.2mm, 8 width W of gap ring minor matters4For 4.9mm~5.5mm, gap ring minor matters 9
Long L8For 9.5mm~10.1mm, 9 width W of gap ring minor matters6For 0.4mm~0.8mm, the long L of gap ring minor matters 1011For 0.8mm~
1.2mm, 10 width W of gap ring minor matters10For 2.9mm~3.3mm, the long L of gap ring minor matters 1110For 2.8mm~3.2mm, gap ring branch
Save 11 width W11For 7.0mm~7.4mm, distance L of ring (2) lower end in gap away from medium substrate lower end is loaded2For 11.5mm~
11.9mm loads the distance W at gap ring (2) inner rectangular coplanar waveguide feeder line (4) edge3For 1mm~1.4mm.
The H-shaped feed terminal (3) is combined by three left side rectangle, intermediate rectangular, right rectangular rectangular patches and is formed H
Shape, left side rectangle length L7For 7.4mm~7.8mm, left side rectangle width W9For 1.8mm~2.2mm, intermediate rectangular length L6For
1.8mm~2.2mm, intermediate rectangular width W8×2+W2Size for 8mm~8.4mm, right rectangular is identical as left side rectangle.
The rectangle conduction band length L that characteristic impedance in the rectangle coplanar waveguide feeder line (4) is 50 Ω1For 15.8mm~
16.4mm, width W2For 2.4mm~2.8mm.
The wide gap floor (5) of the rectangle extends conduction band, upside closure conduction band and upside rectangle by rectangle floor, left and right
Protrusion composition, the long L on rectangle floor3For 8.9mm~9.5mm, the wide W on rectangle floor1For 12.7mm~13.1mm, left and right extends
The long L of conduction band9For 17.2mm~17.6mm, left and right extends the wide W of conduction band7For 2.3mm~2.7mm, the length of upside rectangular preiection
L12For 2.8mm~3.2mm, the wide W of upside rectangular preiection12For 13.5mm~14.5mm.
Embodiment: specific manufacturing process is as described in embodiment.Select FR4 epoxy resin medium substrate, permittivity εr
=4.4, thickness h=1.6mm, metal layer thickness 0.04mm, coaxial fitting is using standard sub-miniature A connector.The long L=of medium substrate
30mm, width W=30mm.It loads gap ring (2) and energy is coupled by H-shaped feed terminal (3), the frequency that can adjust low-frequency range is rung
It answers, certain resonance size can be obtained in limited range by introducing load gap ring (2), further decrease the body of antenna
Product, the positions and dimensions for rationally adjusting load gap ring (2) can generate specific frequency response, realize that the multiband of antenna is special
Property, load gap ring (2) on the upside of with H-shaped feed terminal (3) between gap width a be 0.9mm, load gap ring (2) remaining
The width b in part and gap between H-shaped feed terminal (3) is 0.6mm, the long L of gap ring minor matters 75For 3.6mm, gap ring minor matters 7
Wide W5For 1mm, the long L of gap ring minor matters 84For 1mm, 8 width W of gap ring minor matters4For 5.2mm, the long L of gap ring minor matters 98For 9.8mm,
9 width W of gap ring minor matters6For 0.6mm, the long L of gap ring minor matters 1011For 1mm, 10 width W of gap ring minor matters10For 3.1mm, gap ring branch
Save 11 long L10For 3mm, 11 width W of gap ring minor matters11For 7.2mm, distance L of ring (2) lower end in gap away from medium substrate lower end is loaded2
For 11.7mm, the distance W at gap ring (2) inner rectangular coplanar waveguide feeder line (4) edge is loaded3For 1.2mm.H-shaped feed terminal
(3) it is combined by three left side rectangle, intermediate rectangular, right rectangular rectangular patches and is formed H-shaped, adjust the ruler of H-shaped feed terminal (3)
The frequency response of very little adjustable antenna high band, left side rectangle length L7For 7.6mm, left side rectangle width W9It is intermediate for 2mm
Rectangle length L6For 2mm, intermediate rectangular width W8×2+W2Size for 8.2mm, right rectangular is identical as left side rectangle.Rectangle
Coplanar waveguide feeder line (4) length L1For 16.1mm, width W2For 2.6mm.The wide gap floor (5) of rectangle is prolonged by rectangle floor, left and right
Conduction band, upside closure conduction band and upside rectangular preiection composition are stretched, the adjustable antenna low-frequency range of size on rectangle floor is adjusted
Impedance matching, middle position increases rectangular preiection above the wide gap floor (5) of rectangle, thus it is possible to vary antenna surface current path
To increase resonance point, and make that there is good isolation, the long L on rectangle floor between each frequency band3For 9.2mm, rectangle
The wide W of plate1For 12.9mm, left and right extends the long L of conduction band9For 17.4mm, left and right extends the wide W of conduction band7For 2.5mm, upside rectangle
The long L of protrusion12For 3mm, the wide W of upside rectangular preiection12For 14mm.The wide gap floor (5) of rectangle and rectangle coplanar waveguide feeder line
(4) the gap g between is 0.3mm.
Antenna model is analyzed using HFSS software, to the long L of major parameter gap ring minor matters 75, H-shaped feed terminal
Left side rectangle length L7, on the upside of wide gap floor rectangular preiection long L12, width W12Analyzed, by adjust this four parameters come
Each frequency range impedance bandwidth is adjusted, impedance matching property is improved.
The long L of gap ring minor matters 75To antenna reflection coefficient S11Influence, as shown in Fig. 2, choosing L respectively5=3.4mm, L5=
3.6mm and L5These three situations of=3.8mm analyze antenna, from figure 2 it can be seen that adjusting L5Size, cause to load
Gap ring overall dimensions change, and so that low-frequency range is generated frequency response, with L5Increase can make low band resonance point to
Low frequency direction shifts, and resonance degree is deepened, smaller to high band resonances degree and bandwidth contributions, the reason is that introducing load seam
Gap ring can couple the energy of H-shaped feed terminal, in 3.5GHz, surface current load gap ring and H-shaped feed terminal it
Between couple strong, load gap ring upper surface electric current is larger, produces preferable frequency response in low-frequency range.Work as L5=3.6mm
When, antenna can be made to generate good impedance operator in 3.5GHz, the resonance point and bandwidth of operation of antenna are best, in low-frequency range
Bandwidth meets work requirements.
Rectangle length L on the left of H-shaped feed terminal7To antenna reflection coefficient S11Influence, as shown in figure 3, choosing L respectively7
=7.4mm, L7=7.6mm and L7These three situations of=7.8mm analyze antenna, from figure 3, it can be seen that with L7's
Increase, high band resonances point is deviated to high frequency direction, and resonance degree reduces, and bandwidth is also reduced, to low band resonance degree
Smaller with bandwidth contributions, the reason is that H-shaped feed terminal end surface current strength is larger in 5.5GHz, H-shaped feed terminal corresponds to
The electric size length of high band increases, and matches band bandwidth to antenna high band and resonance degree is affected, and therefore, adjusts H
The size of shape feed terminal can motivate the high-end frequency band of 5.5GHz.Work as L7When=7.6mm, antenna can be made to produce in 5.5GHz
Raw good impedance operator, makes antenna meet design requirement in the performance and bandwidth of high band.
The long L of rectangular preiection on the upside of wide gap floor12, width W12To antenna reflection coefficient S11Influence, as shown in figure 4, point
It Xuan Qu not L12=2.8mm, W12=13.5mm, L12=3mm, W12=14mm and L12=3.2mm, W12These three situations of=14.5mm
Antenna is analyzed, figure 4, it is seen that with L12、W12Increase, low band resonance point to low frequency direction deviate, it is humorous
Vibration degree is reduced, and high band resonances point is deviated to high band direction, and resonance degree first increases to be reduced afterwards, two working frequency range
Isolation increased, the reason is that change the surface current path of antenna after increasing rectangular preiection on the upside of wide gap floor,
It is concentrated mainly on rectangular preiection lower edge and load gap ring top edge in low-frequency range antenna surface electric current, rectangular preiection size
Increase make corresponding to low-frequency range lateral electric size increase, so as to improve antenna low-frequency range impedance bandwidth and resonance frequency
Rate is concentrated mainly near rectangular preiection lower edge and H-shaped feed terminal, so rectangle is convex in the surface current of high band antenna
The change in size risen also produces certain influence to the resonance frequency of high band.As selection L12=3mm, W12It, can be with when=14mm
Balanced antenna and increases the isolation between two frequency ranges in the low high-end frequency response of 3.5GHz and 5.5GHz, makes each
The bandwidth of operation of frequency range meets design requirement.
It is obtained by the above comparative analysis, as the long L of gap ring minor matters 75Rectangle length on the left of=3.6mm, H-shaped feed terminal
L7The long L of=7.6mm and floor upside rectangular preiection12=3mm, width W12When=14mm, antenna has good reflection coefficient frequency
Band.
Use the reflection coefficient of vector network analyzer test antenna, reflection coefficient S11Change curve and emulation with frequency
Comparative result is as shown in figure 5, reflection coefficient S11Impedance bandwidth simulation result less than -10dB low-frequency range be 3.11GHz~
3.91GHz is 4.79GHz~6.22GHz in high band, and measured result is 3.11GHz~3.92GHz, impedance band in low-frequency range
Width covering WiMAX (3.3GHz~3.7GHz) frequency range is 4.81GHz~6.25GHz in high band, and impedance bandwidth covers WLAN
(5.15GHz~5.825GHz) frequency range, produces dual-band characteristic, and the resonance point of emulation is located at 3.50GHz, 5.51GHz
Place, corresponding resonance peak intensity are respectively -40.8dB, -44.2dB, and the resonance point of actual measurement is located at 3.49GHz, 5.55GHz
Place, corresponding resonance peak intensity are respectively -43.2dB, -47.5dB, can satisfy the work requirements of antenna.Measured result and imitative
True result consistency is preferable, and actual measurement and simulation curve coincide substantially at low frequency, in high frequency treatment there are certain deviation, causes to deviate
The main reason for for manual welding coaxial fitting introduce error, and test environment generates certain influence to measurement result.
E face of the antenna at two Frequency points of 3.49GHz, 5.55GHz and H surface radiation directional diagram are tested, examined
The radiation characteristic of antenna, actual measurement directional diagram are as shown in Figure 6, Figure 7.It can be seen from the figure that radiation pattern is in the face E approximation
The figure of eight, in the face H approximation omnidirectional, for high band directional diagram there are slight shift, main cause is increase and the load gap of frequency
There is Incomplete matching in the impedance of the presence of ring, the impedance and antenna that make rectangle coplanar waveguide feeder line, results in radiation direction
Slight shift has occurred in figure.Illustrate that antenna has preferable omni-directional in two frequency ranges, radiation characteristic is stablized, can be expired simultaneously
Demand of sufficient WiMAX, WLAN frequency range to small multiple band wireless communication system.
The peak gain curve for testing antenna different frequency point in frequency band, as shown in figure 8, being selected at random in frequency range
Take several Frequency points, it can be seen that in 3.11GHz~3.92GHz frequency range, the peak gain variation range of antenna is
3.3dBi~4.2dBi, in 4.81GHz~6.25GHz frequency range, the variation range of peak gain be 4.5dBi~
5.3dBi, antenna gain stabilization in working frequency range, peak gain is in rising trend with the increase of frequency, and main cause is with frequency
The corresponding electric size of increase antenna of rate also increases, and is consequently increased the gain of antenna, illustrates antenna in two frequency ranges
Gain performance is good.
Claims (5)
1. a kind of H-shaped feed terminal double frequency plane slot antenna for loading gap ring, by medium substrate (1), is printed on medium base
The wide gap floor (5) of load gap ring (2), H-shaped feed terminal (3), rectangle coplanar waveguide feeder line (4), rectangle on plate (1) and
External coaxial fitting (6) is constituted, it is characterised in that:
A. the load gap ring (2) is located at around H-shaped feed terminal (3), keeps one with H-shaped feed terminal (3) outer edge
Set a distance, along H-shaped current feed terminal (3), surrounding is bent, and load gap ring (2) couples energy by H-shaped feed terminal (3),
The frequency response of low-frequency range can be adjusted, certain resonance ruler can be obtained in limited range by introducing load gap ring (2)
It is very little, the volume of antenna is further decreased, the positions and dimensions for rationally adjusting load gap ring (2) can generate specific frequency and ring
It answers, realizes the multi-band of antenna；
B. the H-shaped feed terminal (3) is combined by three left side rectangle, intermediate rectangular, right rectangular rectangular patches and is formed H
Shape, intermediate rectangular lower end are connected with coplanar waveguide feeder line (4), and intermediate rectangular two sides are separately connected left side rectangle and right side square
Shape adjusts the frequency response of the adjustable antenna high band of size of H-shaped feed terminal (3)；
C. the rectangle coplanar waveguide feeder line (4) is the rectangle conduction band that one section of characteristic impedance is 50 Ω, the feedback of rectangle co-planar waveguide
The upper end of line (4) is connected with the center lower end of H-shaped current feed terminal (3), and the lower end of rectangle coplanar waveguide feeder line (4) is external coaxial
Connector (6), the width for adjusting coplanar waveguide feeder line (4) can further adjust the impedance matching of antenna, broaden the impedance of antenna
Bandwidth；
D. the wide gap floor (5) of rectangle is convex by rectangle floor, left and right extension conduction band, upside closure conduction band and upside rectangle
Composition is played, rectangle floor, left and right form the wide gap of rectangle after extending conduction band, upside closure conduction band combination, adjust rectangle floor
The impedance matching of the adjustable antenna low-frequency range of size, middle position increases rectangular preiection above the wide gap floor (5) of rectangle,
Antenna surface current path be can change to increase resonance point, and make that there is good isolation between each frequency band；
E. the coaxial fitting (6) is located on the central axis of medium substrate (1) lower end, and coaxial fitting (6) is coplanar with rectangle respectively
Waveguide feeder (4) is connected with two lower edges of the wide gap floor (5) of rectangle.
2. a kind of H-shaped feed terminal double frequency plane slot antenna for loading gap ring according to claim 1, feature exist
It is located at around H-shaped feed terminal (3) in the load gap ring (2), load gap ring (2) upside and H-shaped feed terminal (3)
Between the width a in gap be 1mm~2mm, load the width in gap between gap ring (2) rest part and H-shaped feed terminal (3)
B is 0.5mm~0.7mm, the long L of gap ring minor matters 75For 3.4mm~3.8mm, 7 width W of gap ring minor matters5For 0.8mm~1.2mm, seam
The long L of gap ring minor matters 84For 0.8mm~1.2mm, 8 width W of gap ring minor matters4For 4.9mm~5.5mm, the long L of gap ring minor matters 98For
9.5mm~10.1mm, 9 width W of gap ring minor matters6For 0.4mm~0.8mm, the long L of gap ring minor matters 1011For 0.8mm~1.2mm, seam
10 width W of gap ring minor matters10For 2.9mm~3.3mm, the long L of gap ring minor matters 1110For 2.8mm~3.2mm, 11 width W of gap ring minor matters11
For 7.0mm~7.4mm, distance L of ring (2) lower end in gap away from medium substrate lower end is loaded2For 11.5mm~11.9mm, load seam
The distance W at gap ring (2) inner rectangular coplanar waveguide feeder line (4) edge3For 1mm~1.4mm.
3. a kind of H-shaped feed terminal double frequency plane slot antenna for loading gap ring according to claim 1, feature exist
It is combined by three left side rectangle, intermediate rectangular, right rectangular rectangular patches in the H-shaped feed terminal (3) and is formed H-shaped, it is left
Side rectangle length L7For 7.4mm~7.8mm, left side rectangle width W9For 1.8mm~2.2mm, intermediate rectangular length L6For 1.8mm
~2.2mm, intermediate rectangular width W8×2+W2Size for 8mm~8.4mm, right rectangular is identical as left side rectangle.
4. a kind of H-shaped feed terminal double frequency plane slot antenna for loading gap ring according to claim 1, feature exist
The rectangle conduction band length L that characteristic impedance in the rectangle coplanar waveguide feeder line (4) is 50 Ω1For 15.8mm~
16.4mm, width W2For 2.4mm~2.8mm.
5. a kind of H-shaped feed terminal double frequency plane slot antenna for loading gap ring according to claim 1, feature exist
Conduction band, upside closure conduction band and upside rectangular preiection group are extended by rectangle floor, left and right in the rectangle wide gap floor (5)
At the long L on rectangle floor3For 8.9mm~9.5mm, the wide W on rectangle floor1For 12.7mm~13.1mm, left and right extends conduction band
Long L9For 17.2mm~17.6mm, left and right extends the wide W of conduction band7For 2.3mm~2.7mm, the long L of upside rectangular preiection12For
2.8mm~3.2mm, the wide W of upside rectangular preiection12For 13.5mm~14.5mm.
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| CN109768371A (en) * | 2019-03-12 | 2019-05-17 | 吉林医药学院 | The double frequency implanted antenna based on graphene for rehabilitation nursing device |
| CN113782973A (en) * | 2021-08-26 | 2021-12-10 | 西南交通大学 | Miniaturized dual-frequency antenna applied to UHF frequency band and loaded with ferrite medium |
| CN114122679A (en) * | 2020-08-31 | 2022-03-01 | 西安电子科技大学 | Meander-loaded airborne knife-type antenna |
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| CN109037924B (en) | 2024-04-26 |
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