CN109273832A - A kind of U-shaped monopole antenna being placed back to back - Google Patents
A kind of U-shaped monopole antenna being placed back to back Download PDFInfo
- Publication number
- CN109273832A CN109273832A CN201811388176.3A CN201811388176A CN109273832A CN 109273832 A CN109273832 A CN 109273832A CN 201811388176 A CN201811388176 A CN 201811388176A CN 109273832 A CN109273832 A CN 109273832A
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- antenna
- shaped
- feed line
- monopole antenna
- placed back
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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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
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- Waveguide Aerials (AREA)
Abstract
A kind of U-shaped monopole antenna being placed back to back can solve bandwidth too narrow the technical issues of being poorly suitable for system of broadband wireless communication of traditional antenna.The two sides of single substrate are symmetrically printed on including the U-shaped monopole antenna that kind is placed back to back, including two U-shaped pasters and feed line, described two U-shaped pasters, the U-shaped paster is connected with feed line；The feed line is the antenna of the coplanar waveguide ground feed with 50 Ω characteristic impedances；The single substrate is arranged in substrate integration wave-guide chamber.The present invention is the coplanar wave guide feedback by being grounded, and the coaxial connector that interface when test in co-planar waveguide directly welds one 50 ohm can realize the test job of antenna.Test result of the present invention shows that antenna has 95.8% bandwidth of operation, and can be realized the maximum gain of 3.75dBi at 2.8GHz.Very stable, the cross polarization very little in the antenna pattern of entire bandwidth of operation internal antenna.The present invention is extremely suitable for use in it in indoor wireless network connection.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of U-shaped monopole antenna being placed back to back.
Background technique
With the fast development of Current wireless communication, no matter in academia or in industry, design has vertical polarization
Wideband monopole sub-antenna all attracted many concerns.Have in omnidirectional radiation pattern and vertical plane in entire horizontal plane
The antenna with conical beam be widely used in indoor wireless communication, such as WLAN or wireless network connection
Deng.However, nearly all wireless device requires that antenna has compactedness and miniaturization.The height of traditional vertical monopole
Degree is about 0.25 λ 0 (centre frequency that λ 0 refers to 10dB input impedance bandwidth), this will hinder making for some low section equipment
With.Recently, it has been proposed that some technologies for reducing antenna profile height include mainly planar inverted-F antenna (PIFA), with TM01
The circular patch antenna and monopole line paster antenna of mode operation.However, the bandwidth of these antenna is too narrow, it is poorly suitable for width
Band wireless communication system.
Summary of the invention
A kind of U-shaped monopole antenna being placed back to back proposed by the present invention, the bandwidth that can solve traditional antenna are too narrow not
The technical issues of being suitable for very much system of broadband wireless communication.
To achieve the above object, the invention adopts the following technical scheme:
A kind of U-shaped monopole antenna being placed back to back, including planting the U-shaped monopole antenna being placed back to back, including two
A U-shaped paster and feed line, described two U-shaped pasters are symmetrically printed on the two sides of single substrate, the U-shaped paster and feed line
Connection；
The feed line is the antenna of the coplanar waveguide ground feed with 50 Ω characteristic impedances；
The single substrate is arranged in substrate integration wave-guide chamber.
Further, the substrate integration wave-guide chamber realizes two rows using PCB, LTCC or thin-film technique on dielectric-slab
Electromagnetic wave is limited in inside two rows of metal apertures and the rectangular cavities of upper and lower two metal interfaces formation by metallic vias；
The short-circuit through-hole of the substrate integration wave-guide chamber meets D/DS >=0.5 and D/ λ 0≤0.1；Wherein, D is indicated each short
The diameter of road through-hole, DS indicate the spacing of two adjacent short-circuit via holes, λ0Indicate free space medium wavelength.
Further, the dielectric-slab is the FR4 plank of single layer, and with a thickness of 1.6mm, dielectric constant 4.4, loss angle is just
It is cut to 0.0024.
It further, further include coaxial probe, the coaxial probe radius is 0.64mm, and the coaxial probe is connected to feedback
The edge of electric wire.
As shown from the above technical solution, the invention proposes a kind of U-shaped monopole antenna being placed back to back, this structures
With broadband character, and it is simple and compact for structure, it is easy to process.Antenna of the invention is the coplanar wave guide feedback by being grounded, and is surveyed
The test job of antenna can be realized when examination in the coaxial connector that the interface of co-planar waveguide directly welds one 50 ohm.
The performance of antenna is verified via elaborate model, and the result of emulation and actual test is very identical, is also demonstrated designed
Antenna reliability and stability.Test result shows that antenna has 95.8% bandwidth of operation, and can at 2.8GHz
Realize the maximum gain of 3.75dBi.Very stable in the antenna pattern of entire bandwidth of operation internal antenna simultaneously, cross polarization is very
It is small.These characteristics of the antenna are extremely suitable for use in it in indoor wireless network connection.
Beneficial effects of the present invention are as follows:
The present invention changes the shape of the sub- patch of traditional square unipolar, is conducive to generate high performance antenna；Overall structure
It is simpler, and formation easy to process；Antenna of the invention has lower section height, and realizes nearly 95% work belt
It is wide.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Resonant surface currents distribution when Fig. 2 (a) is 1.6GHz of the present invention；
Resonant surface currents distribution when Fig. 2 (b) is 3GHz of the present invention；
3 D stereo antenna pattern when Fig. 2 (c) is 1.6GHz of the present invention；
3 D stereo antenna pattern when Fig. 2 (d) is 3GHz of the present invention；
Fig. 3 is variation figure line of the artificial reflections coefficient of inventive antenna in different W1；
Fig. 4 is variation figure line of the artificial reflections coefficient of inventive antenna in different S1；
Fig. 5 is the reflection coefficient of the antenna of present invention simulation and measurement；
Fig. 6 is the actual gain and radiation efficiency of present invention simulation and measurement；
Fig. 7 is the radiation diagram of simulation and measurement of the present invention under three different frequencies of 2GHz, 2.5GHz and 3GHz
Compare；
Fig. 8 is that structural parameters of the invention indicate schematic diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.
A kind of U-shaped monopole antenna being placed back to back of the embodiment of the present invention to be a kind of there is low section broadband to lean against
Carry on the back U-shaped monopole antenna.Two U-shaped pasters introduced are symmetrically printed on the two sides up and down of substrate.The antenna is grounded with one
Co-planar waveguide result feed, feed port is integrated with antenna structure, thus there is no increase antenna complexity.This
The antenna of invention has successfully been processed into material object and has measured result.The result of emulation and test is coincide very much, illustrates to be proposed
The wideband monopole sub-antenna with very compact structure validity.
The present embodiment is specific as follows:
Fig. 1 is the schematic diagram for the back-to-back monopole antenna with cone of radiation that the present embodiment proposes, detail parameters column
In table 1.As can be seen that antenna is mainly made of two U-shaped pasters and a coplanar waveguide ground feed line with 50 Ω.
Two U-shaped pasters are symmetrically printed on the two sides of single substrate.All antenna structures are placed on a substrate integration wave-guide (SIW)
In chamber, such waveguide generallys use PCB, and LTCC or thin-film technique realize two rows of metallic vias on dielectric-slab, this
Inside the rectangular cavities that sample, which is done, can be limited in electromagnetic wave two rows of metal apertures and upper and lower two metal interfaces are formed, the cavity knot
The short-circuit through-hole of structure needs meets the condition of D/DS >=0.5 and D/ λ 0≤0.1.Dielectric-slab used is the FR4 plank of monolithic, thickness
For 1.6mm, dielectric constant 4.4, loss angle tangent 0.0024.Antenna is by the coplanar waveguide ground with 50 Ω characteristic impedances
Feed, the feed line are connected directly with U-shaped patch, are all to print to prepare by PCB technology.It then is the same of 0.64mm by radius
Axis, which is popped one's head in, is connected to the edge of coplanar waveguide ground.Antenna profile height is about wave corresponding to lowest operating frequency in free space
Long 0.007 times, overall structure is having a size of 50 × 66mm2.The present embodiment is a kind of very simple and compact U-shaped monopole day
Line has broadband and stable antenna pattern characteristic, while also having stable and moderate yield value.(parameter indicates ginseng
According to Fig. 8)
| Parameters | GW | GL | WD | LD | WS | LS | LF | D |
| Value(mm) | 50 | 66 | 41.6 | 41.6 | 39 | 39 | 14.5 | 1 |
| Parameters | W1 | W2 | L1 | Gap | S1 | WF | DS | L2 |
| Value(mm) | 3 | 6 | 28 | 0.3 | 2.5 | 1.7 | 1.2 | 23 |
Table 1
Wherein, GW is the width of FR4 dielectric-slab；GL is the length of FR4 dielectric-slab；
The width of WD expression substrate integrated wave-guide cavity wave；The length of LD expression substrate integrated wave-guide cavity wave；
WS indicates the width in the gap cut out in the upper surface of substrate integrated wave-guide cavity wave；LS is indicated in substrate integration wave-guide
The length in the gap that the upper surface of cavity is cut out；
LF indicates the side cavity of substrate integration wave-guide to the length of feed port；
D indicates the diameter of each short-circuit through-hole；
DS indicates the spacing of two adjacent short-circuit via holes；
W1 indicates the width of U-shaped one branch of monopole antenna；
W2 indicates the width of U-shaped monopole antenna horizontal component；
L1 indicates the length of U-shaped one branch of monopole antenna；
Gap indicates coplanar waveguide ground feed line with a distance from level ground；
S1 indicates the horizontal component of U-shaped monopole antenna with a distance from feed end；
The width of WF expression coplanar waveguide ground feed line；
L2 indicates the spacing between two branches of U-shaped monopole antenna.
The working principle of the present embodiment is as follows:
Fig. 2 is the Surface current distribution and 3 D stereo radiation pattern of the back-to-back U-shaped paster of the present embodiment, specifically, Fig. 2
(a) Surface current distribution of the resonance at 1.6GHz is illustrated, and its corresponding 3 D stereo radiation pattern is in Fig. 2 (c)
In provide, indicate radiation pattern be 360 ° of omnidirectional radiations.It can be observed that the amplitude in the direction ± y is lower than the vibration in the direction ± x
Width, this is because influence of the ground level along the Liang Ge branch of U-shaped paster.It has also been discovered that similar shows in the frequency of 3GHz
As.
The Parameter analysis of the present embodiment:
Fig. 3 shows the stickogram changed for different in width W1 with working frequency, wherein when the W1=14mm epoch
The complete patch of table.With reference to Fig. 3, it can be observed that the resonance frequency of antenna is transferred to lower frequency as W1 increases.This be by
Causing current path to extend in the larger size of patch leads to resonance frequency decline.However, when W1 changes to 14mm from 5,
The reflection coefficient of the antenna proposed is higher than -10dB in the frequency range of 3GHz to 3.25GHz.As W1=1mm, lower
Frequency band also there is a phenomenon where similar.It shows that W1 is the sensitive parameter for adjusting impedance matching.Therefore, in order to realize good resistance
Anti- matching and broader bandwidth select W1=3mm.
Fig. 4 gives frequency characteristic of the reflection coefficient relative to U-shaped paster length S1.Figure 4, it is seen that working as S1=
When 0.5mm, better impedance matching is realized at lower band, but when S1 changes to 6.5mm from 4.5, impedance matching
Significant changes.Finally, selecting the value of S1 is 2.5mm to realize wide impedance bandwidth.
Fig. 5 gives the reflection coefficient of simulation and the measurement of proposed antenna.As shown in fig. 6, antenna has wide impedance
Bandwidth.It can be observed that simulation is very consistent with measurement result.The impedance bandwidth (reflection coefficient < -10dB) measured be 1.25 to
3.55GHz, corresponding analog result are 1.35 to 3.55GHz.Fine difference between simulation and measurement result is mainly due to
Caused by test connector and test installation error.
In the measurements, a good double-ridged horn antenna of feature is used as calibrating the reference of near field system, is used for antenna
Gain and radiation efficiency measurement.The actual gain and testing efficiency of the antenna proposed are as shown in Figure 6.The peak gain measured is high
Up to 3.75dBi, frequency is at 2.8GHz.In addition, also using the gross efficiency of identical Multi probe near field system measurement antenna, and
Its radiation efficiency is extracted by taking out the influence of impedance mismatching from the gross efficiency of measurement.It is therefore possible for the detected that radiation efficiency about
It is 85%.However, the measurement gain of the antenna proposed and efficiency slightly reduce compared with analog gain and simulation precision.This
Kind gain and the reduction of efficiency are mainly since error inevitable in the dielectric loss and antenna fabrication process of FR4 substrate is made
At.
Fig. 7 shows the ratio of the radiation diagram of simulation and measurement under three different frequencies of 2GHz, 2.5GHz and 3GHz
Compared with.There is good consistency between simulation and measurement result.The radiation diagram of these frequencies in horizontal plane (shows in left side
It is stable omni-directional pattern out), there are low cross-polarization levels.Therefore, the signal of the antenna proposed receives fidelity
It is very high, and it is able to detect the signal for being in and occurring at any angle in different direction angle plane.On the other hand, it is vertically putting down
In face (shown in right side), it may be clearly seen that there are zero point in broadside, maximum gain is occurred in about in the horizontal direction,
This is very suitable to indoor wireless link, such as WLAN.It can be seen that the cross polarization of simulation and the measurement of the antenna proposed it
Between fine difference, this is mainly due to caused by foozle and faulty measurement.
From the foregoing, it will be observed that a kind of very simple U-shaped unipole antenna back-to-back of the embodiment of the present invention.By being laminated in FR4
Two U-shaped pasters are placed in the two sides of plate, and antenna can show the frequency bandwidth more than 95%.What the embodiment of the present invention was proposed
Monopole antenna have the advantages that it is significant, such as in structure it is very compact, manufacturing cost is low, and can without using impedance become
Pass through 50 coaxial cable direct feeds in the case where depressor or feed Balun.Simulation shows good consistent with measurement result
Property.The measurement peak gain of 3.8dBi is realized under the frequency of 2.8GHz.Therefore, the design that the embodiment of the present invention is proposed exists
It is conformal, and need low cost and with have been widely used in broadband indoor communications.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (4)
1. a kind of U-shaped monopole antenna being placed back to back, it is characterised in that: including two U-shaped pasters (1) and feed line (2),
Described two U-shaped pasters (1) are symmetrically printed on the two sides of single substrate (3), the U-shaped paster (1) and feed line (2) connection；
The feed line (2) is the antenna of the coplanar waveguide ground feed with 50 Ω characteristic impedances；
The single substrate (3) is arranged in substrate integration wave-guide chamber (4).
2. the U-shaped monopole antenna according to claim 1 being placed back to back, it is characterised in that: the substrate integrates wave
Guide cavity realizes two rows of metallic vias using PCB, LTCC or thin-film technique on dielectric-slab, and electromagnetic wave is limited in two rows of metals
Inside the rectangular cavities that hole and upper and lower two metal interfaces are formed；
The short-circuit through-hole of the substrate integration wave-guide chamber meets D/DS >=0.5 and D/ λ0≤0.1；
Wherein, D indicates that the diameter of each short-circuit through-hole, DS indicate the spacing of two adjacent short-circuit via holes, λ0It indicates in free space
Wavelength.
3. the U-shaped monopole antenna according to claim 2 being placed back to back, it is characterised in that: the dielectric-slab is single
The FR4 plank of layer, with a thickness of 1.6mm, dielectric constant 4.4, loss angle tangent 0.0024.
4. the U-shaped monopole antenna according to claim 3 being placed back to back, it is characterised in that: it further include coaxial probe,
The coaxial probe radius is 0.64mm, and the coaxial probe is connected to the edge of feed line (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811388176.3A CN109273832A (en) | 2018-11-21 | 2018-11-21 | A kind of U-shaped monopole antenna being placed back to back |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811388176.3A CN109273832A (en) | 2018-11-21 | 2018-11-21 | A kind of U-shaped monopole antenna being placed back to back |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109273832A true CN109273832A (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811388176.3A Pending CN109273832A (en) | 2018-11-21 | 2018-11-21 | A kind of U-shaped monopole antenna being placed back to back |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113851820A (en) * | 2021-10-21 | 2021-12-28 | 四川启睿克科技有限公司 | Ultra wide band omnidirectional printing antenna based on unmanned aerial vehicle machine carries |
| US11399428B2 (en) | 2019-10-14 | 2022-07-26 | International Business Machines Corporation | PCB with substrate integrated waveguides using multi-band monopole antenna feeds for high speed communication |
| US11658378B2 (en) | 2019-10-14 | 2023-05-23 | International Business Machines Corporation | Vertically transitioning between substrate integrated waveguides (SIWs) within a multilayered printed circuit board (PCB) |
-
2018
- 2018-11-21 CN CN201811388176.3A patent/CN109273832A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11399428B2 (en) | 2019-10-14 | 2022-07-26 | International Business Machines Corporation | PCB with substrate integrated waveguides using multi-band monopole antenna feeds for high speed communication |
| US11658378B2 (en) | 2019-10-14 | 2023-05-23 | International Business Machines Corporation | Vertically transitioning between substrate integrated waveguides (SIWs) within a multilayered printed circuit board (PCB) |
| CN113851820A (en) * | 2021-10-21 | 2021-12-28 | 四川启睿克科技有限公司 | Ultra wide band omnidirectional printing antenna based on unmanned aerial vehicle machine carries |
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Address after: 238000 Granshan South Road, Chaohu Economic Development Zone, Hefei City, Anhui Province Applicant after: Hefei Vocationl Technical College Address before: 230012 Volkswagen Road, Hefei New Station High-tech Zone, Hefei City, Anhui Province Applicant before: Hefei Vocationl Technical College |