CN104882676A - Low-frequency ultra-wideband planar omnidirectional antenna - Google Patents
Low-frequency ultra-wideband planar omnidirectional antenna Download PDFInfo
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- CN104882676A CN104882676A CN201510222461.8A CN201510222461A CN104882676A CN 104882676 A CN104882676 A CN 104882676A CN 201510222461 A CN201510222461 A CN 201510222461A CN 104882676 A CN104882676 A CN 104882676A
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- 239000002184 metal Substances 0.000 claims abstract description 49
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 230000005855 radiation Effects 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000005404 monopole Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 241000826860 Trapezium Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a low-frequency ultra-wideband planar omnidirectional antenna. The antenna includes a dielectric substrate, a metal radiation patch, a metal ground plate and a loading resistor. The dielectric substrate is made from FR-4, and has a first surface and a second surface opposite to the first surface. The metal radiation patch is arranged on the first surface of the dielectric substrate. The metal ground plate and the loading resistor are arranged on the second surface of the dielectric substrate. The metal radiation patch is formed by a U-shaped patch and a disc. The tail end of the U-shaped patch and the top end of a gradual changing microstrip feed line are connected via an inverted triangular metal patch. The metal ground plate is a rectangular frame metal patch, a trapezoid patch and two long strip patches are arranged inside the metal rectangular frame, and the same load resistance is applied to the two ends of the metal rectangular frame. Feeding of the whole antenna is carried out through a 50[omega] coaxial line. The low-frequency ultra-wideband planar omnidirectional antenna provided by the invention is compact in structure and wide in bandwidth scope, and exhibits good low frequency omnidirectional performance.
Description
Technical field
The invention belongs to microstrip antenna field, relate to a kind of novel plane ultra-wideband Antenna Design, this antenna frequencies covers VHF and uhf band, has good omnidirectional characteristic.
Background technology
In Modern Communication System, antenna, as the important component part of system, there has been proposed more and more higher broadband and miniaturized requirement.The design of antenna must consider bandwidth of operation, the unit for electrical property parameters such as system gain and each side such as compact conformation, miniaturization factor.Present stage is operated in wideband omnidirectional antenna mainly back taper antenna, discone antenna, the sleeve antenna etc. in VHF and uhf band.If this few class antenna is operated in VHF frequency range, bulk is larger.And in numerous antenna, plane single pole sub antenna has gain is high, size is little feature by the extensive investigation and application of people in UWB field.Therefore, planar microstrip monopole antenna is applied to VHF and uhf band is significant.
In plane single pole sub antenna, by antenna corner cut, use the methods such as the feed line of circle or oval monopole and gradual change, effectively can widen the bandwidth of antenna.In addition, different feeding classifications also can increase the working band of antenna.During this period, the feeding classification of co-planar waveguide (CPW) feed is suggested and is applied to UWB field, the more satisfactory result obtained.By the feeding classification of co-planar waveguide (CPW) feed, someone devises a super-wide-band flat antenna, this antenna is formed based on this thinking of complanation of discone antenna, antenna by the monopole patch of ellipse, gradual change microstrip feed line and trapezoidal to form.Antenna is produced on 1.524mm, and on the substrate of dielectric constant 3.48, be of a size of 0.19 λ * 0.16 λ, λ is the wavelength of antenna when 0.41GHz.After optimized dimensions, the Impedance measurement bandwidth of this antenna more than 21:1, covering frequence scope 0.41-8.86GHz, and there is good omnidirectional radiation characteristic.In addition, someone have devised a kind of novel carrier-borne ultrashort wave wide antenna, and first adopt plane asymmetric dipole form another day, upper radiating surface is ellipse fitting structure, and lower radiating surface is exponential fade trapezium structure.This operating frequency of antenna scope is 30-400MHz, and in the frequency band of 13.3:1, the voltage standing wave ratio of antenna is less than 2.9, and water product face pattern distortion degree is less than 3.8dB, and the height of antenna is 0.326 λ, wavelength when λ is antenna 30MHz.
Summary of the invention
The object of the invention is: in order to overcome the problem of existing VHF/UHF beamwidth of antenna narrow range, provide a kind of bandwidth range wide, the good plane microstrip antenna design of omnidirectional's performance.By loading resistor, antenna return loss reaches 30MHz lower than the low-limit frequency of-10db, has accomplished that size is little as much as possible simultaneously.
Technical scheme of the present invention is: a kind of low-frequency ultra-wideband plane omnidirectional antenna, comprising: one piece of medium substrate, metal radiation paster, metal ground plate and loading resistor; Medium substrate material is FR-4, comprises first surface and the second surface relative with first surface; Metal radiation paster is arranged at the first surface of medium substrate, and metal ground plate and loading resistor are arranged on the second surface of medium substrate;
Described metal radiation paster is made up of a U-shaped paster and disk; Between U-shaped paster end and gradual change microstrip feed line top, be connected by a del metal patch 1;
Described metal ground plate is a rectangle frame metal patch, then add a trapezoidal paster and two strip pasters 2,3 in metal rectangular frame inside, and be loaded with an identical resistance load resistance at two lower ends of metal rectangular frame and trapezoidal paster footing place respectively; Distributing point feed point is positioned at antenna bottom.
Described medium substrate is of a size of 0.12 λ × 0.1 λ, and thickness h < < λ, λ are the wavelength of Antenna Operation bandwidth minimum point.
Described between U-shaped paster end and gradual change microstrip feed line top, add del metal patch 1, effectively can widen the bandwidth of antenna HFS.
The minimum frequency of low antenna, effectively can fall in described loading resistor load resistance on metal ground plate.
Described adds two strip pasters 2,3 in metal rectangular frame inside, can reduce the minimum frequency of antenna.
Inventive antenna is plane single pole sub antenna, and λ is the wavelength of Antenna Operation bandwidth minimum point, and low-limit frequency is 30MHz.
Beneficial effect
The present invention devises the plane microstrip antenna that is operated in VHF and uhf band.This Research of Antenna Polarization is perpendicular polarization, is 30-1000MHz by its bandwidth of operation of loading resistor.Record result display by experiment, antenna has good omni-directional.When Antenna Operation is at 100MHz, antenna has maximum gain 2.8dBi.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 (a) is pictorial diagram of the present invention, and (b) is feed placement pictorial diagram of the present invention, and (c) is loading resistor position of the present invention pictorial diagram.
Fig. 3 is the simulation parameter figure with or without return loss S11 during inverted triangle structure of the present invention.
Fig. 4 is that the simulated return loss S11 that the present invention did not load and loaded different resistance schemes.
Fig. 5 is that the simulated return loss S11 that metal floor rectangle frame of the present invention inside adds under two strip paster different lengths schemes.
Fig. 6 is that the present invention emulates and schemes with the return loss S11 surveyed.
Fig. 7 is actual measurement gain diagram of the present invention.
Fig. 8 is the emulation of the present invention H-plane and E-plane when (a) 30MHz, (b) 500MHz and (c) 900MHz and actual measurement directional diagram.
Embodiment
As depicted in figs. 1 and 2, be a kind of low-frequency ultra-wideband plane omnidirectional antenna provided by the invention, it comprises: one piece of medium substrate, metal radiation paster, metal ground plate and loading resistor.Medium substrate material is FR-4, comprises first surface and the second surface relative with first surface; Metal radiation paster is arranged at the first surface of medium substrate, and metal ground plate and loading resistor are arranged on the second surface of medium substrate; Antenna carries out feed by 50 Ω coaxial lines, and distributing point (feed point) is positioned at 0.5cm place, antenna bottom, as Fig. 2 (b).
Described metal radiation paster is made up of a U-shaped paster and disk; Between U-shaped paster end and gradual change microstrip feed line top, be connected by a del metal patch 1;
Described metal ground plate is a rectangle frame metal patch, a trapezoidal paster and two strip pasters 2,3 are then added in metal rectangular frame inside, and be loaded with identical resistance (load resistance) at the two ends of metal rectangular frame, as Fig. 2 (c);
As shown in Figure 3, for a kind of low-frequency ultra-wideband plane omnidirectional antenna provided by the invention between U-shaped paster end and gradual change microstrip feed line top with or without the simulation parameter figure of return loss S11 during inverted triangle structure 1, as can be seen from this figure when there being inverted triangle structure, antenna after 500MHz return loss S11 all below-10dB.
As shown in Figure 4, the simulated return loss S11 not loading and load different resistance (load resistance) for a kind of low-frequency ultra-wideband plane omnidirectional antenna provided by the invention on metal ground plate schemes, as can be seen from this figure the minimum frequency of antenna never loading resistor time 70MHz, have decreased to the 30MHz after loading 150 Ω, the beamwidth of antenna is obviously widened.
As shown in Figure 5, for a kind of low-frequency ultra-wideband plane omnidirectional antenna provided by the invention is schemed at the inner simulated return loss S11 added under two strip pasters 2,3 different length of antenna metal floor rectangle frame, patch length is different as can be seen from this figure, and the minimum frequency of antenna will change to some extent.
As shown in Figure 6, be emulation of the present invention and actual measurement return loss S11 figure, the service frequency range of this low-frequency ultra-wideband plane omnidirectional antenna is scope from 30MHz to 1000MHz as can be seen from this figure.
As shown in Figure 7, be actual measurement gain diagram of the present invention, antenna gain when 30MHz is minimum is as can be seen from this figure-19.3dBi; When 100MHz, gain is up to 2.8dBi.
As shown in Figure 8, be the directional diagram of inventive antenna, each concentrically ringed width represents 5dB, and antenna has good omni-directional when low frequency as can be seen from this figure.
When directional diagram and the gain of measuring antenna, then by double antenna method, use Fu Lisi transmission formula to obtain, concrete steps are as follows:
P
tfor transmitting power, P
rfor received power, G
tfor transmitter antenna gain (dBi), G
rfor receiving antenna gain, d is the distance between two antennas.Formula is obtained after abbreviation:
(P
R,dB-l
R,dB)-(P
T,dB+l
T,dB)＝G
T,dB+G
R,dB-20log
10f-20log
10d+147.56 (2)
1. signalization generator sends frequency f, transmitting power P
t;
2. by vowing that net records the loss l of transmission line between transmitting antenna and signal source
t, dB, reception antenna and vowing net between the loss l of transmission line
r, dB;
3., by just right for 2 the same antennas, ensure that distance d between antenna is in far field.Measure the power P of vowing that net receives
r;
4., according to formula (2), make G
t, dB=G
r, dBobtain 2 same antennas just pair time gain G;
5. keep reception antenna motionless, transmitting antenna is rotated θ angle, measure the power P of vowing that net receives
r θ;
6. according to formula (2), G, P
t, P
r θ, l
t, dB, l
r, dBsubstitute into, calculate the gain G that reception antenna rotates θ angle aft antenna
θ;
7. repeat step 4, calculate the gain G under different angles θ
θ, obtain the directional diagram of antenna.Find out maximum G
θ max;
8. change and send frequency f, repeat step 3-8, obtain the maximum G of gain under different frequency
θ max, obtain the gain diagram of antenna.
This low-frequency ultra-wideband plane omnidirectional antenna can as a ultra-wideband antenna be applied to vehicle-mounted and carrier-borne on, meanwhile, due to the flatness of its structure, make antenna have good conduct in hidden.In addition, this antenna also can be used for various Wireless Telecom Equipment.
Claims (7)
1. a low-frequency ultra-wideband plane omnidirectional antenna, is characterized in that, comprising: one piece of medium substrate, metal radiation paster, metal ground plate and loading resistor; Medium substrate material is FR-4, comprises first surface and the second surface relative with first surface; Metal radiation paster is arranged at the first surface of medium substrate, and metal ground plate and loading resistor are arranged on the second surface of medium substrate;
Described metal radiation paster is made up of a U-shaped paster and disk; Between U-shaped paster end and gradual change microstrip feed line top, be connected by a del metal patch (1);
Described metal ground plate is a rectangle frame metal patch, then add a trapezoidal paster and two strip pasters (2,3) in metal rectangular frame inside, and be loaded with an identical resistance (load resistance) at two lower ends of metal rectangular frame and trapezoidal paster footing place respectively; Distributing point (feed point) is positioned at antenna bottom.
2. a kind of low-frequency ultra-wideband plane omnidirectional antenna according to claim 1, it is characterized in that: described medium substrate is of a size of 0.12 λ × 0.1 λ, thickness h < < λ, λ are the wavelength of Antenna Operation bandwidth minimum point.
3. a kind of low-frequency ultra-wideband plane omnidirectional antenna according to claim 2, is characterized in that: between U-shaped paster end and gradual change microstrip feed line top, adds del metal patch (1), effectively widened the bandwidth of antenna HFS.
4. a kind of low-frequency ultra-wideband plane omnidirectional antenna according to claim 3, is characterized in that: loading resistor (load resistance) on metal ground plate, effectively reduces the minimum frequency of antenna.
5. a kind of low-frequency ultra-wideband plane omnidirectional antenna according to claim 4, is characterized in that: add two strip pasters (2,3) in metal rectangular frame inside, can reduce the minimum frequency of antenna.
6. a kind of low-frequency ultra-wideband plane omnidirectional antenna according to claim 5, is characterized in that: antenna is plane single pole sub antenna.
7. a kind of low-frequency ultra-wideband plane omnidirectional antenna according to claim 6, it is characterized in that: λ is the wavelength of Antenna Operation bandwidth minimum point, low-limit frequency is 30MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510222461.8A CN104882676B (en) | 2015-05-04 | 2015-05-04 | A kind of low-frequency ultra-wideband plane omnidirectional antenna |
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| CN201510222461.8A CN104882676B (en) | 2015-05-04 | 2015-05-04 | A kind of low-frequency ultra-wideband plane omnidirectional antenna |
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| Publication Number | Publication Date |
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| CN104882676A true CN104882676A (en) | 2015-09-02 |
| CN104882676B CN104882676B (en) | 2018-08-24 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149098A (en) * | 2018-10-10 | 2019-01-04 | 江苏中科智睿物联网科技有限公司 | A kind of pole wide-band printing unipole antenna |
| CN111048888A (en) * | 2019-12-13 | 2020-04-21 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted 5G antenna structure and vehicle-mounted shark fin |
| CN111211415A (en) * | 2020-03-09 | 2020-05-29 | 西南交通大学 | Miniaturized ultra wide band microstrip antenna |
| CN111276808A (en) * | 2020-03-12 | 2020-06-12 | 南京理工大学 | Omnidirectional ultra-wideband antenna |
| CN111555022A (en) * | 2020-04-23 | 2020-08-18 | 天津大学 | Single trapped wave plane printing ultra wide band antenna |
| CN112736420A (en) * | 2020-10-15 | 2021-04-30 | 天津津航计算技术研究所 | Resistance-loaded Klopfenstein gradient profile ultra-wideband antenna |
| CN113410633A (en) * | 2021-06-18 | 2021-09-17 | 大连理工大学 | Dual-polarization ultra-wideband flexible microstrip patch antenna |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149098A (en) * | 2018-10-10 | 2019-01-04 | 江苏中科智睿物联网科技有限公司 | A kind of pole wide-band printing unipole antenna |
| CN111048888A (en) * | 2019-12-13 | 2020-04-21 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted 5G antenna structure and vehicle-mounted shark fin |
| CN111048888B (en) * | 2019-12-13 | 2021-12-31 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted 5G antenna structure and vehicle-mounted shark fin |
| CN111211415A (en) * | 2020-03-09 | 2020-05-29 | 西南交通大学 | Miniaturized ultra wide band microstrip antenna |
| CN111276808A (en) * | 2020-03-12 | 2020-06-12 | 南京理工大学 | Omnidirectional ultra-wideband antenna |
| CN111555022A (en) * | 2020-04-23 | 2020-08-18 | 天津大学 | Single trapped wave plane printing ultra wide band antenna |
| CN112736420A (en) * | 2020-10-15 | 2021-04-30 | 天津津航计算技术研究所 | Resistance-loaded Klopfenstein gradient profile ultra-wideband antenna |
| CN113410633A (en) * | 2021-06-18 | 2021-09-17 | 大连理工大学 | Dual-polarization ultra-wideband flexible microstrip patch antenna |
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| Publication number | Publication date |
|---|---|
| CN104882676B (en) | 2018-08-24 |
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