CN105305058B - A kind of ultra wide band mimo antennas with three frequency range trap characteristics - Google Patents
A kind of ultra wide band mimo antennas with three frequency range trap characteristics Download PDFInfo
- Publication number
- CN105305058B CN105305058B CN201510861118.8A CN201510861118A CN105305058B CN 105305058 B CN105305058 B CN 105305058B CN 201510861118 A CN201510861118 A CN 201510861118A CN 105305058 B CN105305058 B CN 105305058B
- Authority
- CN
- China
- Prior art keywords
- wide band
- ultra wide
- input terminal
- item
- medium substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention discloses a kind of ultra wide band mimo antennas with three frequency range trap characteristics, including medium substrate, two rectangular radiation elements of front printing of the medium substrate, described two rectangular radiation elements are symmetrical about medium substrate middle line, print floor in the medium substrate back side, each rectangular radiation element is provided with inverted U-channel, it further include two input terminal feeder lines, the rectangular radiation element is connect with input terminal feeder line, every input terminal feeder line two sides are equipped with parasitic item, including inside parasitism item and outside parasitism item.The present invention is suitable for all kinds of small mobile terminals including mobile phone.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of ultra wide band multiple-input, multiple-output with three frequency range trap characteristics
Antenna.
Background technique
With the rapid development of Modern wireless communication technology, requirement of the communication system to antenna is higher and higher, and design has
The ultra wide band mimo antennas of multiple frequency band trap characteristics is the hot spot of Recent study.Multiple-input, multiple-output Multiple-
Input-multiple-output (MIMO) technology, because channel capacity can be increased considerably, and does not need additional increasing
Add spectral range and input power, has become the new important research direction of Antenna Design.Ultra wide band ultra-wideband
(UWB) be it is a kind of there is very broadband, applied to large capacity, high data rate wireless portable device in communication skill
Art.For increase channel capacity further by a larger margin, in recent years, MIMO technology is gradually introduced setting for ultra-wideband antenna
Meter.In view of work can have that interference, design have and all have in multiple frequency bands between the system of different frequency range
The ultra wide band mimo antenna of trap characteristic is current research tendency.For example, work in ultra wideband frequency 3.1GHz-10.6GHz,
The 5.15GHz-5.35GHz of WLAN wireless local area network (WLAN) can be filtered out simultaneously,
The antenna of 5.725GHz-5.825GHz and the C-band 3.7GHz-4.2GHz of satellite communication system.With high speed integrated circuit
Fast development, for system equipment to integration, miniaturization is integrated constantly to stride forward, as the terminal of radio-based electronic devices, modern electricity
The requirement that sub- equipment proposes miniaturization to antenna, is easily integrated.
More trap ultra wide band mimo antennas of miniaturization are a kind of arrays that can commonly effectively filter out multiple interference bands
Antenna.There are mainly three types of the implementation methods of traditional ultra wide band mimo antenna trap: first is that opening in radiation patch or floor
Slot is as resonator, second is that extending special construction in radiation patch or floor as resonator, third is that in radiation patch
Or parasitic special construction is placed around floor as resonator.These resonators can specific frequency formed resonance from
And achieve the purpose that lack outside radiation energy in feature frequency range.
Traditional ultra wide band mimo antennas with trap characteristic, due to the limitation of size, can only realize one or
Two notch bands.And a defect outstanding is that notch band is wide, so that useful frequency range be made to be filtered out, wastes one
Fixed usable frequency.
Summary of the invention
In order to overcome shortcoming and deficiency of the existing technology, the present invention provides a kind of super with three frequency range trap characteristics
Broadband mimo antennas.
The present invention uses traditional feed microstrip line method, using multiple new resonators and then realizes multiple relatively narrow fall into
Wave frequency band, and by isolation between feed port of the cumulative floor extension minor matters of one width of design to improve full frequency band, it obtains
To a kind of novel ultra wide band mimo antennas with multiband trap characteristic.Compact dimensions, structure is simple, processing and manufacturing
At low cost, engineering practicability is high.
The present invention adopts the following technical scheme:
A kind of ultra wide band mimo antennas with three frequency range trap characteristics, including medium substrate, the medium substrate
Front printing two rectangular radiation elements, described two rectangular radiation elements are symmetrical about medium substrate middle line, the medium
Substrate back prints floor, is provided with inverted U-channel in each rectangular radiation element, further includes two input terminal feeder lines, the rectangle
Radiating element is connect with input terminal feeder line, and every input terminal feeder line two sides are equipped with parasitic item, including inside parasitism item and outside
Parasitic item.
The central axes on the floor are equipped with the cumulative floor of width and extend minor matters, and the cumulative floor of the width extends minor matters
It is connect with floor.
The inverted U-channel is particularly located at the centre of rectangular radiation element, and is opened along the edge of rectangular radiation element
Slot.
The total length of the inverted U-channel is 25.6mm.
The input terminal feeder line is characterized 50 ohm of impedance of microstrip line.
The parasitic length in the inside is 16.0mm, and the parasitic length in the outside is 17.4mm.
Two input terminal feeder lines are symmetrical about medium substrate middle line.
The medial and lateral parasitism item is C-shaped parasitism item.
Beneficial effects of the present invention:
(1) ultra wideband frequency, 3.1GHz-10.6GHz are completely covered with the structure of plane, while can effective filtered out
Three interference bands: the 5.15GHz-5.35GHz of WLAN wireless local area network (WLAN),
The C-band 3.7GHz-4.2GHz of 5.725GHz-5.825GHz and satellite communication system.Most importantly, due to notch band pole
It is narrow, come so that the usable frequency of 5.35GHz-5.725GHz saves, available effective use.
(2) planar dimension of entire antenna, is 30mm × 26mm comprising floor, and the size of occupancy is extremely small, and available
The FR4 plate of planographic technique and low cost, reduces manufacturing cost.
(3) structure of antenna is simple, and debugging is convenient, and operating mode is clear, and the mode in each trap frequency can be only
Vertical flexible adjusting, for filtering out other interfering frequencies.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the ultra wide band mimo antennas with three frequency range trap characteristics of the present invention；
Fig. 2 is the overlooking structure figure of Fig. 1；
Fig. 3 is the face upwarding assumption diagram of Fig. 1；
Fig. 4 is the side block diagram of Fig. 1；
Fig. 5 is the return loss and frequency relation figure that the present invention implements emulation.
Fig. 6 is the interport isolation and frequency relation figure of emulation of the embodiment of the present invention.
Fig. 7 is the gain diagram that the present invention implements emulation.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
Inside is known as close to medium substrate middle line side in the present embodiment, do not become outer close to medium substrate middle line side
Side.
As shown in Figure 1, a kind of ultra wide band mimo antennas with three frequency range trap characteristics, including medium substrate, institute
It gives an account of matter substrate front side and prints two rectangular radiation elements 1,2, described two rectangular radiation elements are about medium substrate central axes
Symmetrically, floor 9 is printed at the medium substrate back side, and floor is rectangle in the present embodiment, and two rectangular radiation elements 1,2 are equivalent to
Two monopole antennas, for the working band of formation width covering 3.1-10.6GHz.
Inverted U-channel is provided in each rectangular radiation element, the inverted U-channel is located at the interposition of rectangular radiation element
It sets, the inverted U-channel is slotted along rectangular element edge, and the length of inverted U-channel is all 25.6mm in the present embodiment, is equivalent to half
Wavelength mode resonance can effective filter out interference band near the 4.0GHz of satellite communication system C-band: satellite communication system
The C-band 3.7GHz-4.2GHz of system；
The invention also includes two input terminal feeder lines 3,4, two input terminal feeder lines are symmetrical about medium substrate middle line,
Two rectangular radiation elements are connect with two input terminal feeder lines respectively, and every input terminal feeder line two sides are equipped with parasitic item, two sides
Parasitic item it is symmetrical about input terminal feeder line, inner side and outer side parasitism item is respectively equivalent to half-wavelength mode resonances in WLAN
Near 5.2GHz and WLAN 5.8GHz, interference band WLAN wireless local area can be effective filtered out
The 5.15GHz-5.35GHz and 5.725-5.825GHz of network (WLAN).
The medial and lateral parasitism item is C-shaped parasitism item, and specifically similar to rectangular C-shaped, filtration result is best.
Every input terminal feeder line has the parasitic item in inside and outside parasitism item, the medial and lateral parasitism item in the present embodiment
Symmetrical about input terminal feeder line, inside parasitism item 7,8 length are 16mm, are equivalent to half-wavelength mode resonances in WLAN 5.8GHz
Near；The length of outside parasitism item 5,6 is 17.4mm, is equivalent to half-wavelength mode resonances near WLAN 5.2GHz.
The central axes on the floor are equipped with the cumulative floor of width and extend minor matters 10, and the cumulative floor of the width extends branch
Section 10 is connect with floor 9, and the width that floor extends minor matters is gradually increased to adjust the isolation of entire ultra wide band frequency band.
The input terminal feeder line 3,4 is characterized 50 ohm of impedance of microstrip line.
Shown in as shown in Figure 2, Figure 3 and Figure 4, the specific size of the present embodiment is as follows:
The thickness H=0.8 of medium substrate, the transverse width W=30 of medium substrate, the extension minor matters on floor are from bottom to top
The transverse width W of first partG2=3, floor extends the transverse width W of the second part of minor matters from bottom to topG3=4.2, floor
Extend the transverse width W of the Part III of minor matters from bottom to topG4=8.8, the transverse width W of rectangular radiation elementr=9.8, square
The transverse width W of inverted U-channel in shape radiating elementr1=8, the transverse width W of the opening of inverted U-channel in rectangular radiation elementr2
=0.4, the longitudinal length W of input terminal feeder line two sides parasitism itemC1=8, the longitudinal direction of the opening of the parasitic item in input terminal feeder line outside
Length WC2=0.6, the opening longitudinal length W of inside parasitism itemC3=2, feeder line inside edge to rectangular radiation element inner side edge
The horizontal spacing W of edgeS1=3.5, the horizontal spacing W of feeder line outer ledge to rectangular radiation element outer ledgeS2=4.7, medium
The longitudinal length L=26 of substrate, the longitudinal length L of floor rectangle partG1=11.7, floor extends first of minor matters from bottom to top
Partial longitudinal length LG2=6.8, floor extends the longitudinal length L of the second part of minor matters from bottom to topG3=6.5, floor is prolonged
Stretch the longitudinal length L of the Part III of minor matters from bottom to topG4=1, the longitudinal length L of feeder linef=12.5, rectangular radiation element
Longitudinal length Lr=8, the spacing h of the lower edge of the lower edge and rectangular radiation element of inverted U-channel in rectangular radiation elementr1=
1, the longitudinal length h of inverted U-channel in rectangular radiation elementr2=6, the lower edge of feeder line two sides parasitism item to dielectric-slab lower edge
Distance hC1=2.5, the transverse width h of feeder line two sides parasitism itemC2=2, the groove width g of inverted U-channel in rectangular radiation elementr=
0.5, the width g of feeder line two sides parasitism itemC1=0.5, the horizontal spacing g of feeder line two sides parasitism item to feeder lineC2=0.4, feeder line
Spacing d of the lateral outer ledge to dielectric-slab outer ledgef=4.9.
The present invention realizes the covering of ultra wideband frequency (3.1GHz-10.6GHz).Two rectangular radiation elements are equivalent to two
Monopole antenna, compared to the biggish minor matters line of length that can only generate single resonance frequency, the lesser rectangular radiation element of structure
Multiple modes of resonance can be generated in 3.1GHz-10.6GHz frequency range, to cover the entire work of 3.1-10.6GHz
Frequency band.And compared to the folding for needing to do serpentine structure in minor matters line, the requirement on machining accuracy of rectangular radiation element is lower,
Easily fabricated realization.The two less parameters of length and width for utilizing rectangle simultaneously, can more neatly adjust ultra wideband frequency
Multiple modes of resonance in (3.1GHz-10.6GHz), to realize accurately being completely covered for frequency.
The notch band for followed by realizing three Independent adjustables, to effective filter out three interference bands: wireless local area
Net the 5.15GHz-5.35GHz of wireless local area network (WLAN), 5.725GHz-5.825GHz and satellite
The C-band 3.7GHz-4.2GHz of communication system.First is that opening total length all and be 25.6mm in the middle of rectangular radiation element falls U
Shape slot, the length of inverted U-channel are equivalent to half-wavelength mode resonances near the 4.0GHz of satellite communication system C-band；Second is that
Parasitic item is added in the outside of two input terminal feeder lines, and total length is all 17.4mm, is equivalent to half-wavelength mode resonances in WLAN
Near 5.2GHz；Third is that adding parasitic item in the inside of two input terminal feeder lines, total length is all 16.0mm, is equivalent to half
Wavelength mode resonance is near WLAN 5.8GHz.The addition of these three resonators can effectively filter out interfering frequency.
It is to realize high interport isolation again.Extend the cumulative ground of width by the back side middle in dielectric-slab
Plate extends minor matters 10, and the antenna pattern that a port can be made to generate is reflected, while being generated using the minor matters 10 new humorous
Vibration mode adjusts isolation, so that the isolation between two ports is reduced to -20dB hereinafter, effectively realizing difference
Minimum is interfered with each other between port.
In order to verify the validity of the present invention program, specific example is given below and is illustrated.
Fig. 2 to Fig. 4 gives embodiment and overlooks, looks up with the dimensional drawing under the different angles such as side view, institute in each figure
The unit for having size is millimeter (mm).In this embodiment, selection relative dielectric constant is 4.4, loss angle tangent is
0.02, with a thickness of the FR4 medium substrate of 0.8mm, the planar dimension of substrate is 30mm × 26mm.The planar rectangular part on floor
Having a size of 30mm × 11.7mm.Rectangular radiation element is located at the side of medium substrate, and the planar dimension of occupancy is 8mm × 9.8mm.
Signal input part feeder line is characterized 50 ohm of impedance of microstrip line.In actual implementation, the radio-frequency feed into circuit can be appropriately extended
Line part, can also the aperture in main floor, with 50 ohm of coaxial line direct feed.The inner conductor of coaxial line and exciting unit phase
Even, outer conductor is connected with main floor.
It is as shown in Figure 5 with the result of the reflection coefficient of the antenna emulation of above-mentioned Fig. 2, Fig. 3 and Fig. 4 illustrated dimension production.By
Figure is it is found that the planar printed antenna has in ultra wideband frequency generates multiple resonance points, shape in 3.1GHz-10.6GHz frequency range
At -10dB bandwidth be 3GHz-11.2GHz, completely covering ultra wideband frequency has in 3.1GHz-10.6GHz frequency range
All available frequency bands.Simultaneously effective filter out three interference bands: WLAN wireless local area network
(WLAN) the C-band 3.7GHz-4.2GHz of 5.15GHz-5.35GHz, 5.725GHz-5.825GHz and satellite communication system.
It is as shown in Figure 6 with the result of the interport isolation of the antenna emulation of above-mentioned 3 figure illustrated dimensions production.Whole
In a ultra wideband frequency 3.1GHz-10.6GHz frequency range, the isolation between port is below -21dB, fully meets practical need
It wants.(actually only the isolation of needs -15dB can meet the needs of practical application).This has benefited from the back side center of dielectric-slab
Between extend the cumulative floor of width and extend the ELECTROMAGNETIC REFLECTION effect that minor matters 10 generate and the new mode of resonance that minor matters 10 generate.
It is as shown in Figure 7 with the gain of the antenna emulation of above-mentioned 3 figure illustrated dimensions production.Antenna gain is in 2-4dBi
Between fluctuate, acutely reduced in tri- notch bands of 3.2/5.5/8GHz.It realizes and filters out the interfering frequency between not homologous ray
Target.
From above-mentioned technical proposal as it can be seen that antenna of the present invention realizes ultra-wide in the plane space of 30mm × 26mm
The notch band of covering and three Independent adjustables with frequency range (3.1GHz-10.6GHz), and have high-isolation between port, it is full
Sufficient mobile communication system is to the design requirement for mobile terminal antenna.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (7)
1. a kind of ultra wide band mimo antennas with three frequency range trap characteristics, which is characterized in that described including medium substrate
Two rectangular radiation elements of front printing of medium substrate, described two rectangular radiation elements are symmetrical about medium substrate middle line,
Floor is printed at the medium substrate back side, is provided with inverted U-channel in each rectangular radiation element, is further included two input terminal feeder lines,
The rectangular radiation element is connect with input terminal feeder line, and every input terminal feeder line two sides are equipped with a parasitic item, i.e. inside is posted
The carded sliver and outside parasitism item；
The central axes on the floor are equipped with the cumulative floor of width and extend minor matters, and the cumulative floor of the width extends minor matters and ground
Plate connection.
2. ultra wide band mimo antennas according to claim 1, which is characterized in that the inverted U-channel is particularly located at square
The centre of shape radiating element, and slot along the edge of rectangular radiation element.
3. ultra wide band mimo antennas according to claim 1, which is characterized in that the total length of the inverted U-channel is
25.6mm。
4. ultra wide band mimo antennas according to claim 1, which is characterized in that the input terminal feeder line is characterized resistance
Anti- 50 ohm of microstrip line.
5. ultra wide band mimo antennas according to claim 1, which is characterized in that the parasitic length in the inside is
16.0mm, the parasitic length in the outside is 17.4mm.
6. ultra wide band mimo antennas according to claim 1, which is characterized in that two input terminal feeder lines about
Medium substrate middle line is symmetrical.
7. ultra wide band mimo antennas according to claim 1, which is characterized in that the medial and lateral parasitism item is C
Shape parasitism item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510861118.8A CN105305058B (en) | 2015-11-30 | 2015-11-30 | A kind of ultra wide band mimo antennas with three frequency range trap characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510861118.8A CN105305058B (en) | 2015-11-30 | 2015-11-30 | A kind of ultra wide band mimo antennas with three frequency range trap characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105305058A CN105305058A (en) | 2016-02-03 |
| CN105305058B true CN105305058B (en) | 2018-12-11 |
Family
ID=55202012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510861118.8A Expired - Fee Related CN105305058B (en) | 2015-11-30 | 2015-11-30 | A kind of ultra wide band mimo antennas with three frequency range trap characteristics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105305058B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755729A (en) * | 2018-12-11 | 2019-05-14 | 上海电力学院 | A kind of dual-attenuation ultra wide band mimo antenna flexible |
| CN109755733A (en) * | 2018-12-11 | 2019-05-14 | 上海电力学院 | A kind of double trap UWB antennas based on liquid crystal polymer |
| CN110931971B (en) * | 2019-12-25 | 2023-12-08 | 贵州民族大学 | Low-coupling microstrip feed ultra-wideband notch antenna structure |
| CN112003023A (en) * | 2020-08-26 | 2020-11-27 | 惠州市德亿科技有限公司 | Manufacturing method and structure of extensible broadband MIMO antenna with self-isolation characteristic |
| CN113178697B (en) * | 2021-04-09 | 2023-11-10 | 维沃移动通信有限公司 | Circuit board and electronic equipment |
| CN114243278A (en) * | 2021-12-15 | 2022-03-25 | 杭州电子科技大学 | Four-trap high-isolation ultra-wideband MIMO antenna |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576932A (en) * | 2011-10-28 | 2012-07-11 | 华为终端有限公司 | Antenna and terminal |
| CN103730722A (en) * | 2014-01-06 | 2014-04-16 | 北京邮电大学 | Small ultra-wide-band antenna with dual-band trapped waves |
| CN103943960A (en) * | 2014-05-13 | 2014-07-23 | 北京邮电大学 | Novel multi-notch ultra-wideband antenna with stop-band units simultaneously loaded to feeder and patch |
| CN205211933U (en) * | 2015-11-30 | 2016-05-04 | 华南理工大学 | Ultra wide band multiple -input multiple -output antenna with three frequency channel trap characteristics |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011087452A1 (en) * | 2010-01-13 | 2011-07-21 | Agency For Science, Technology And Research | Antenna and receiver circuit |
| CN103682625B (en) * | 2012-09-18 | 2018-03-27 | 中兴通讯股份有限公司 | A kind of multi-input/output antenna and mobile terminal |
-
2015
- 2015-11-30 CN CN201510861118.8A patent/CN105305058B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576932A (en) * | 2011-10-28 | 2012-07-11 | 华为终端有限公司 | Antenna and terminal |
| CN103730722A (en) * | 2014-01-06 | 2014-04-16 | 北京邮电大学 | Small ultra-wide-band antenna with dual-band trapped waves |
| CN103943960A (en) * | 2014-05-13 | 2014-07-23 | 北京邮电大学 | Novel multi-notch ultra-wideband antenna with stop-band units simultaneously loaded to feeder and patch |
| CN205211933U (en) * | 2015-11-30 | 2016-05-04 | 华南理工大学 | Ultra wide band multiple -input multiple -output antenna with three frequency channel trap characteristics |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105305058A (en) | 2016-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105305058B (en) | A kind of ultra wide band mimo antennas with three frequency range trap characteristics | |
| EP3245691B1 (en) | Low common mode resonance multiband radiating array | |
| US6882317B2 (en) | Dual antenna and radio device | |
| CN108232443B (en) | Microstrip slot antenna with reconfigurable directional diagram | |
| WO2012088837A1 (en) | Array antenna of mobile terminal and implementing method thereof | |
| US7800543B2 (en) | Feed-point tuned wide band antenna | |
| EP3767742B1 (en) | Antenna device and mobile terminal | |
| JP2005525036A (en) | Antenna device and module including antenna device | |
| CN110444870B (en) | Base station, broadband dual-polarization filtering magnetoelectric dipole antenna and radiation unit thereof | |
| US20110241950A1 (en) | Combination antenna and methods | |
| JP2016514933A (en) | Multiband antenna | |
| CN106654555B (en) | Small-size asymmetric high-isolation UWB-MIMO antenna | |
| CN105552553A (en) | Miniature three-frequency four-unit MIMO antenna | |
| CN107394365B (en) | The restructural ultra wide band differential antennae of trap | |
| CN210430080U (en) | Broadband dual-polarization filtering base station antenna unit, base station antenna array and communication equipment | |
| WO2016097712A1 (en) | Reconfigurable multi-band multi-function antenna | |
| CN110994170A (en) | Miniaturized high-pass filtering dual-polarization patch antenna | |
| WO2018119929A1 (en) | Electromagnetic multi-input multi-output antenna system and mobile terminal | |
| CN105406184A (en) | Novel ultra-wide band MIMO (Multiple Input Multiple Output) antenna | |
| CN105470643B (en) | Difference UWB antennas with high cmrr and high rectangle degree trap | |
| CN105576372A (en) | Small differential notch UWB-MIMO antenna | |
| CN205211933U (en) | Ultra wide band multiple -input multiple -output antenna with three frequency channel trap characteristics | |
| CN205211935U (en) | Novel ultra wide band MIMO antenna | |
| CN105406182B (en) | A kind of UWB mimo antennas that notch bandwidth is controllable | |
| CN105305052A (en) | High rectangle factor trap UWB (ultra wide band) slot antenna based on differential step feed |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181211 Termination date: 20211130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |