CN104638355B - A kind of ultra-wideband antenna of the double trap characteristics of band - Google Patents
A kind of ultra-wideband antenna of the double trap characteristics of band Download PDFInfo
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- CN104638355B CN104638355B CN201510033728.9A CN201510033728A CN104638355B CN 104638355 B CN104638355 B CN 104638355B CN 201510033728 A CN201510033728 A CN 201510033728A CN 104638355 B CN104638355 B CN 104638355B
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Abstract
The invention discloses a kind of ultra-wideband antennas of the double trap characteristics of band, including：It is disposed on the substrate the Radiating dipole and the first and second capacitive loops load split ring on surface；It is etched with trap slot on the Radiating dipole, is fed by feed line, the first and second capacitive loops load split ring is separately positioned on the both sides of feed line.The present invention loads split ring by etched a trap slot on radiating dipole patch respectively and using a pair of of capacitive loop at feeder line, effectively inhibits the interference of WiMAX (3.3 3.8GHz) systems and WLAN (5.15 5.825GHz) system.
Description
Technical field
The present invention relates to communication fields, more particularly to a kind of ultra-wideband antenna of the double trap characteristics of band.
Background technology
The past about ten years in, due to ultra wide band (UWB, Ultra Wide Band) antenna protrude advantage, such as high number
According to rate and low-power consumption, the interest of extensive industry is caused.However, the significant challenge that the design of UWB antennas faces is from packet
Include the stability of electromagnetic interference (EMI, Electromagnetic Interference) and radiation.Electromagnetic interference is essentially from complete
Ball microwave interconnecting (WiMAX, Worldwide Interoperability for Microwave Access) (3.3-3.8GHz)
With WLAN (WLAN, Wireless Local Area Networks) (5.155.825GHz) system, these systems frequency
Section occupies Federal Communications Commission (FCC, Federal Communications Commission) and distributes to UWB's
Frequency range (3.1-10.6GHz).It is interfered to mitigate the electromagnetism (EMI) caused by WiMAX and wlan system, researcher has carried
Many UWB antenna designs with trap characteristic are gone out.However, due to the omni-directional feature of these antenna, the type antenna
Usual all low gains.
On the other hand, requirement of the modern wireless communication systems for safety and efficiency is higher and higher, and therefore, there is an urgent need to days
Line has good directionality and high-gain simultaneously.In order to meet the needs of these are stringent, researcher has been designed that one
A little ultra-wideband antennas of the orientation with high-gain, combine reflector structure by using electromagnetic dipole (ME), height may be implemented
Gain, stable antenna pattern and wide bandwidth.In addition, using box-like reflector, an orientation band trap there is also a kind of
With the UWB antennas of high gain characteristics, however, the program only realizes the trap of a frequency band, and parasitism is stacked due to adding
Patch (SSP) is to increase antenna height.
In conclusion common Ultrawide-band trap antenna is usually omni-directional and low gain, safety and efficiency cannot be met
It is required that；Electromagnetic dipole ultra-wideband antenna with reflector has high-gain and directional characteristic, but fails to realize trap, does not meet
Anti-interference requirement.
Invention content
It is existing for solving the technical problem to be solved in the present invention is to provide a kind of ultra-wideband antenna of the double trap characteristics of band
The electromagnetic interference problem of technology ultra-wideband antenna.
In order to solve the above technical problems, the present invention provides a kind of ultra-wideband antenna of the double trap characteristics of band, including：
It is disposed on the substrate the Radiating dipole and the first and second capacitive loops load split ring on surface；The spoke
It penetrates on dipole and is etched with trap slot, fed by feed line, the first and second capacitive loops load split ring is separately positioned on
The both sides of feed line.
Further, trap slot is used to control the frequency range of trap, and the total length of trap slot is longer, and trap frequency frequency is lower；
The well width of trap slot is wider, and trap frequency is wider.
Further,
Wherein, LAlwaysFor the total length of trap slot, C is the light velocity, fWiMAXFor WiMAX trap frequencies, εeffIt is normal for effective dielectric
Number.
Further, Radiating dipole is ellipse, and trap slot is U-lag, the length L of the closed end of U-lag1, U-lag
Height L2With the well width W of U-lag1Value range is respectively 15.5mm≤L1≤2*Rmajor；2mm≤L2≤2*Rminor；0.1mm
≤W1≤2mm；Wherein, RmajorFor elliptic radiation dipole major axis radius, RminorFor elliptic radiation dipole major axis radius.
Further, the first and second capacitives loop load split ring is respectively used to control the frequency range of different traps,
With the different length of sides, the length of side that the first and second capacitive loops load split ring is longer, and trap frequency frequency is lower；First He
The ring width that second capacitive loop loads split ring is wider, and trap frequency is wider.
Further,
Wherein, LHold 1The length of side of split ring is loaded for the first capacitive loop, C is the light velocity, fWLANFor WLAN trap frequencies, εeff
For effective dielectric constant.
Further, the first capacitive loop load the distance between split ring and feed line G1Value range is 0.1mm≤G1
≤2mm；
Second capacitive loop loads the distance between split ring and feed line G2Value range is 0.1mm≤G2≤2mm。
Further, the antenna further includes：
Arc floor board in base lower surface, the arc height H of the arc floor board are setarcValue range is, 1mm≤
Harc≤6mm。
Further, the antenna further includes：
Copper reflector, the copper reflector are tubaeform or box-like；The open end of copper reflector constitutes the upper of the antenna
Surface, blind end constitute the lower surface of the antenna, and the substrate is fixed on the lower surface of the antenna by plastics screw.
Further, the distance H of the lower surface of antenna and base lower surfacegroundValue be,
Wherein, C is the light velocity, εeffFor effective dielectric constant, fcenterFor the centre frequency of ultra-wideband antenna.
The present invention has the beneficial effect that：The present invention by etched on radiating dipole patch respectively a trap slot and
A pair of of capacitive loop load split ring is used at feeder line, effectively inhibits the interference of WiMAX system and wlan system.
Description of the drawings
Fig. 1 is a kind of schematic three dimensional views of the ultra-wideband antenna of the double trap characteristics of band in the embodiment of the present invention；
Fig. 2 a are a kind of vertical views of the ultra-wideband antenna of the double trap characteristics of band in the embodiment of the present invention；
Fig. 2 b are the enlarged diagrams of capacitive loop load split ring big in the embodiment of the present invention；
Fig. 2 c are the enlarged diagrams of capacitive loop load split ring small in the embodiment of the present invention；
Fig. 2 d are the enlarged diagrams of arc floor board in the embodiment of the present invention；
Fig. 3 is a kind of side view of the ultra-wideband antenna of the double trap characteristics of band in the embodiment of the present invention；
Fig. 4 a, Fig. 4 b and Fig. 4 c are that U-type groove and capacitive loop load split ring exist in the embodiment of the present invention respectively
The vector current distribution map of 3.5GHz, 5.3GHz and 5.6GHz frequency range；
Fig. 4 d are that U-type groove and capacitive loop load split ring show in the current strength of different channel section in the embodiment of the present invention
It is intended to；
Fig. 5 is a kind of standing-wave ratio of the ultra-wideband antenna of the double trap characteristics of band and increasing in simulation and the test embodiment of the present invention
Beneficial schematic diagram；
Fig. 6 a and Fig. 6 b are a kind of the super of the double trap characteristics of band in 4GHZ frequency bands emulate and measure the embodiment of the present invention
The antenna pattern of broad-band antenna；
Fig. 7 a and Fig. 7 b are a kind of the super of the double trap characteristics of band in 7GHZ frequency bands emulate and measure the embodiment of the present invention
The antenna pattern of broad-band antenna；
Fig. 8 a and Fig. 8 b are a kind of the super of the double trap characteristics of band in 9GHZ frequency bands emulate and measure the embodiment of the present invention
The antenna pattern of broad-band antenna.
Specific implementation mode
In order to solve the problems, such as the electromagnetic interference of prior art ultra-wideband antenna, the present invention provides a kind of double traps of band are special
The ultra-wideband antenna of property, below in conjunction with attached drawing and embodiment, the present invention will be described in further detail.It should be appreciated that this
The described specific embodiment in place is only used to explain the present invention, does not limit the present invention.
As shown in Figure 1, the antenna includes copper reflector 1, substrate 2, Radiating dipole 4, feed line 6, a pair of of capacitive load
Split ring and arc floor board 10；Wherein copper reflector 1 is tubaeform, is prepared using copper product, the open end of the copper reflector 1
The upper surface of antenna is constituted, blind end constitutes the lower surface of the antenna, and the area of upper surface is more than the area of lower surface.Substrate
2 use one piece of rectangular Rogers 5880 (Rogers 5880) substrate, and plastics screw is arranged near 2 four angles of substrate and fixes
Substrate 2 is fixed on the lower surface of antenna by hole 3, plastics screw by plastics screw fixing hole 3.In the lower surface (base of substrate 2
The side of the plate 2 towards lower antenna surface) it is printed with one piece of arc floor board 10, arc floor board 10 is used as ground plane, arc
The arc of plate 10 is the circular arc protruded to Radiating dipole 4, that is to say, that one piece is arranged between substrate 2 and the lower surface of antenna
Arc floor board 10；It is printed with the Radiating dipole of ellipse in one end of the upper surface (lower surface back to the side) of substrate 2
4, one end on substrate 2 belonging to Radiating dipole 4 is referred to as the top of substrate 2, and the other end is referred to as the bottom end of substrate 2；Radiation
Dipole 4 is fed by feed line 6；And U-lag 5 is etched on Radiating dipole 4, the open end of U-lag 5 is towards substrate 2
Top, closed end is towards feed line 6.One end of feed line 6 is connect with Radiating dipole 4, and the other end connects with SMA connectors 7
It connects, is arranged on the substrate 2 on the both sides of feed line 6 a pair of with various sizes of capacitive loop load split ring, that is to say, that
The length of side difference of the two capacitive loops load split ring length of side of two capacitive loops load split rings and per one side in other words
Ring width is different.Two capacitive loop load split rings are the first capacitive loop load split ring 8 and the second capacitive ring respectively
Road loads split ring 9, and the opening of two capacitive loop load split rings is back in feed line 6.
As shown in Fig. 2 a, 2b, 2c and 2d, the thickness (H of substrate 2sub) it is 0.787mm, dielectric constant 2.2.Elliptical spoke
Penetrate the long axis (R of dipole 4major) and short axle (Rminor) radius is respectively 19mm and 9.8mm.
U-lag 5 is mainly used to electromagnetic interference caused by avoiding WiMAX (3.3-3.8GHz).Wherein U-lag can also use
E shape slots, referred to as trap slot, the frequency range of the total length control WiMax traps of trap slot, total length is longer, trap frequency
Frequency is lower；The well width W of trap slot1The width of trap is controlled, W1 well widths are wider, and trap frequency is wider.Vice versa.Example
As trap slot be U-type groove when, the total length L of trap slotAlways=L1+2*L2；Coincidence formula is answered in general：Wherein C is the light velocity, fWiMAXFor WiMAX trap frequencies, εeffFor effective dielectric constant.Value range
For：15.5mm≤L1≤2*Rmajor；2mm≤L2≤2*Rminor；0.1mm≤W1≤ 2mm, the well width (W of U-lag 51) be
0.4mm, the length (L of 5 closed end of U-lag1) it is 25.5mm, the height (L of U-lag 52) it is 4.9mm.The width of feed line 6
(Wline) it is 2mm, characteristic impedance is 50 Ω.The distance between the bottom end of substrate and U-lag closed end (H1) it is 26.3mm.
Due to the broader bandwidth of WLAN (5.15-5.825GHz) trap band, it is divided into two continuous trap sections, respectively
Correspondingly it is specifically designed the two capacitive loops load split ring (i.e. for 5.15-5.35GHz and 5.35-5.825GHz：The
One, two capacitive loops load split ring), to generate and control two continuous notch bands, to inhibit WLAN (5.15-
5.825GHz) caused by electromagnetic interference.The global shape of first/second capacitive split ring can be rectangular or semicircle
Or triangle, feature, which is opening, parallel capacitance mouth, and strap is parallel with feed line at the feed line；With large scale
The length of side (the L of split ring (the first capacitive split ring)Hold 1) for, LHold 1=L3+2*(L4+L5+L6)+6*W2, should meet：I.e.Wherein C is the light velocity, fWLANFor WLAN traps
Frequency, εeffFor effective dielectric constant.That is length of side L3+2*(L4+L5+L6)+6*W2The frequency range of WLAN traps is controlled, total length is longer,
Trap frequency frequency is lower；W2The width of main control trap, W2Wider, trap frequency is wider, in addition, W2It is wider, trap frequency
Frequency is higher.Vice versa is in addition, the distance between big/small capacitive split ring and feed line G1/G2Also important, nearlyr coupling electricity
Stream effect is better, and general value range is：0.1mm≤G1≤2mm；0.1mm≤G2≤2mm；The two capacitive loops load opening
Ring width (the W of ring2、W3) be all 0.4mm, and with the spacing (G of feed line 61、G2) it is 0.1mm.
In addition, in order to realize that good impedance matching, ground plane print on the back of the substrate and be designed to arc
, substrate back arc ground height HarcImpedance matching can be mainly adjusted, the UWB beamwidths of antenna are expanded, value range is generally answered
For：1mm≤Harc≤6mm。
In order to obtain good directionality and high-gain, the reflector of optimization is used, horn launch device mainly plays raising
Gain and the effect for improving orientation direction figure, shape can be loudspeaker or box-like.Wherein horn launch device lower surface (antenna
Lower surface) and the distance between substrate HgroundFor key parameter, value should meetWherein
Wherein C is the light velocity, εeffFor effective dielectric constant fcenterFor the centre frequency of ultra-wideband antenna.The general value range of other parameters
For：77mm≤Luref≤121mm；77mm≤Llref≤121mm,Llref≤Luref,8mm≤Href≤60mm.Its height (Href) excellent
It is selected as 22mm.The distance between substrate and reflector bottom (Hground) it is 10mm, influence of the distance for gain is very heavy
It wants.Upper surface (the L of the antennauref×Luref) and lower surface (Llref×Llref) size be respectively 99 × 99mm2 and 77 ×
77mm2.The antenna detailed dimensions are preferably as shown in Table 1.
Table 1
In table, L1And L2The height of the closed end length and U-lag 5 of U-lag 5 is indicated respectively；L3Indicate the first capacitive loop
The strap for being parallel to feed line for loading split ring 8, mainly comes the current coupling of feed line to the first capacitive ring, L4Table
Show the strap perpendicular to feed line of the first capacitive loop load split ring 8, L6Indicate the first capacitive split ring opening
Vertical component, it is main in perception, L5It indicates the horizontal component of the first capacitive split ring opening, is in mainly capacitive；L7Indicate second
Capacitive loop loads the strap for being parallel to feed line of split ring 9, mainly the current coupling of feed line is come to hold to second
Property ring, L8Indicate the strap perpendicular to feed line of the second capacitive loop load split ring 9, L9Indicate the second capacitive split ring
The vertical component of opening, it is main in perception, L10It indicates the horizontal component of the second capacitive split ring opening, is in mainly capacitive；
L11Indicate the length of arc floor board 10, W4Indicate the width of arc floor board 10, HarcIndicate the arc height of arc floor board 10；Lsub
And WsubThe length and width of substrate 2, H are indicated respectivelysubIndicate the thickness of substrate 2, HgroundIndicate following table of the substrate 2 away from antenna
The height in face；LlineIndicate the length of feed line 6, WlineIndicate the width of feed line 6；H2And H3Small capacitive opening is indicated respectively
Ring (the second capacitive split ring) the distance between bottom end and substrate bottom end and big capacitive split ring (the first capacitive split ring) bottom end
The distance between substrate bottom end.
U-type groove and capacitive loop load split ring divide in the vector current of 3.5GHz, 5.3GHz and 5.6GHz different frequency range
Cloth is as shown in Fig. 4 a, Fig. 4 b, Fig. 4 c and Fig. 4 d.These frequencies are the center frequency of WiMAX and WLAN (high and low frequency section) respectively
Rate.As can be seen from Fig., U-type groove and a pair of of capacitive loop load split ring are most strong in three above frequency range difference electric current, and its
His local electric current is relatively small, i.e. this U-type groove and a pair of of capacitive loop load split ring is each serving as leading work with super band
With, it is stronger than electric dipole electric current, to realize trap effect.
Middle band in the embodiment of the present invention is measured by Agilent E5071C Network Analyzers and SATIMO antenna measurement systems
The standing-wave ratio of the ultra-wideband antenna of double trap characteristics, gain, antenna pattern.
As shown in figure 5, measured curve coincide well with simulation curve.The impedance bandwidth of measurement is 3-10.8GHz, wherein falling into
Wave frequency band is 3.2-3.9GHz and 5.1-5.9GHz (SWR≤2).The lower part of WiMAX and WLAN and staying for top trap frequency
The peak value of Bobbi is respectively 15.5,7.5 and 9.1, corresponds to above-mentioned notch band, and measured gain drops to 2.7 respectively,
7.4 and 6.7dBi.In other words, which can inhibit WiMAX and WLAN to interfere, with obvious effects.At remaining frequency range, the increasing surveyed
Benefit fluctuates between 9.5dBi-12.5dBi, includes required UWB frequency bands, is more stable and sufficiently high and fixed
Tropism is suitable for the application of UWB.As shown in Fig. 6 a, Fig. 6 b, Fig. 7 a, Fig. 7 b, Fig. 8 a and Fig. 8 b, it is good fixed which is presented
To radiation characteristic.In operating frequency range, symmetrical antenna pattern has been substantially carried out in the faces E- and H-.In addition, in E-
It is substantially below -22dB with the cross-polarization levels measured by the faces H-, and it is front and back than being both greater than 16dB.Due to by high band
The influence of second harmonic, the main polarization faces E are slightly divided into three parts.
The ultra-wideband antenna of the double trap characteristics of the band of the embodiment of the present invention has low-cross polarization, the faces E of almost symmetry and H
Face electrical characteristics, the requirement of safety and efficiency and double notch bands can be met simultaneously.By respectively in radiating dipole patch
On etched a U-lag and load split ring using a pair of of capacitive loop at the feeder line, inhibit WiMAX (3.3-
3.8GHz) the interference of system and WLAN (5.15-5.825GHz) system；By the cambered design of ground plane below substrate, carry
For excellent impedance matching；Safety and the requirement of efficiency are met by the horn-like copper reflector of optimization, and is obtained good
Good directionality and high gain characteristic.According to test result, the ultra-wideband antenna of the double trap characteristics of band of the embodiment of the present invention is gathered around
There are these features, is suitable for orientation ultra-wideband communications, meets safety and the requirement of directionality, high data transmission rate.
Although being example purpose, the preferred embodiment of the present invention is had been disclosed for, those skilled in the art will recognize
Various improvement, increase and substitution are also possible, and therefore, the scope of the present invention should be not limited to the above embodiments.
Claims (7)
1. a kind of ultra-wideband antenna of the double trap characteristics of band, which is characterized in that including：
It is disposed on the substrate the Radiating dipole on surface, the first and second capacitive loops load split ring and copper reflector；Institute
It states and is etched with trap slot on Radiating dipole, fed by feed line, the first and second capacitive loops load split ring is set respectively
It sets in the both sides of feed line；Trap slot is used to control the frequency range of trap, and the total length of trap slot is longer, and trap frequency frequency is got over
It is low；The well width of trap slot is wider, and trap frequency is wider；The first and second capacitives loop load split ring is respectively used to control
The frequency range of different traps is made, there is the different length of sides；
The copper reflector is tubaeform；The open end of copper reflector constitutes the upper surface of the antenna, and blind end constitutes the antenna
Lower surface, the substrate is fixed on the lower surface of the antenna by plastics screw；
The lower surface of copper reflector and the distance H of base lower surfacegroundValue be,
Wherein, C is the light velocity, εeffFor effective dielectric constant, fcenterFor the centre frequency of ultra-wideband antenna.
2. antenna as described in claim 1, which is characterized in that including：
Wherein, LAlwaysFor the total length of trap slot, C is the light velocity, fWiMAXFor WiMAX trap frequencies, εeffFor effective dielectric constant.
3. the antenna as described in claim 1-2 is any, which is characterized in that including：
Radiating dipole is ellipse, and trap slot is U-lag, the length L of the closed end of U-lag1, U-lag height L2And U-shaped
The well width W of slot1Value range is respectively 15.5mm≤L1≤2*Rmajor；2mm≤L2≤2*Rminor；0.1mm≤W1≤2mm；Its
In, RmajorFor elliptic radiation dipole major axis radius, RminorFor elliptic radiation dipole minor axis radius.
4. antenna as described in claim 1, which is characterized in that including：
The length of side that first and second capacitive loops load split ring is longer, and trap frequency frequency is lower；First and second capacitive rings
The ring width that road loads split ring is wider, and trap frequency is wider.
5. antenna as claimed in claim 4, which is characterized in that including：
Wherein, LHold 1The length of side of split ring is loaded for the first capacitive loop, C is the light velocity, fWLANFor WLAN trap frequencies, εeffTo have
Imitate dielectric constant；W2The ring width of split ring is loaded for the first capacitive loop.
6. antenna as described in claim 1, which is characterized in that including：
First capacitive loop loads the distance between split ring and feed line G1Value range is 0.1mm≤G1≤2mm；
Second capacitive loop loads the distance between split ring and feed line G2Value range is 0.1mm≤G2≤2mm。
7. antenna as described in claim 1, which is characterized in that the antenna further includes：
Arc floor board in base lower surface, the arc height H of the arc floor board are setarcValue range is 1mm≤Harc≤
6mm。
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| CN201510033728.9A CN104638355B (en) | 2015-01-23 | 2015-01-23 | A kind of ultra-wideband antenna of the double trap characteristics of band |
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