CN208368725U - A kind of differential feed double-frequency planar antenna - Google Patents
A kind of differential feed double-frequency planar antenna Download PDFInfo
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- CN208368725U CN208368725U CN201820755371.4U CN201820755371U CN208368725U CN 208368725 U CN208368725 U CN 208368725U CN 201820755371 U CN201820755371 U CN 201820755371U CN 208368725 U CN208368725 U CN 208368725U
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- medium substrate
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Abstract
The utility model discloses a kind of differential feed double-frequency planar antennas, including reflecting plate, support construction, the first feeder line, the second feeder line, medium substrate, antenna radiation unit；Medium substrate is fixed on reflecting plate by support construction；First feeder line connect reflecting plate and medium substrate with the second feeder line；On antenna radiation unit etching media substrate, it includes the first bowknot oscillator, the second bowknot oscillator, the first long-armed oscillator, the second long-armed oscillators, feed microstrip line structure；First bowknot oscillator and the second bowknot oscillator are symmetrical；First long-armed oscillator is connect with the first bowknot oscillator, and the second long-armed oscillator and the second bowknot oscillator are in succession；First long-armed oscillator and the second long-armed oscillator are symmetrical；Feed microstrip line structure connects the first bowknot oscillator and the second bowknot oscillator；The utility model uses differential feed structure combination planar structure, convenient in conjunction with differential radio frequency front end, realizing that two-frequency operation, high gain, antenna pattern are stablized.
Description
Technical field
The utility model relates to the research field of mobile communication, in particular to a kind of differential feed double-frequency planar antenna.
Background technique
More and more concerns are obtained using the integrated RF front end of differential port in recent years, because traditional antenna is most
One port devices are designed as, in order to solve the integrated of single port antenna and radio-frequency front-end, generalling use balun, (balancedunbalanced turns
Parallel operation) differential signal is converted to feed-in single port antenna after single port signal.Differential antennae is poor unlike traditional antenna
Divided antenna uses two feed ports, signal can be directly fed into two ports of antenna, so as to avoid balun
It uses, so that reducing signal improves antenna efficiency in the loss of input port, while can directly be connect with radio-frequency front-end,
Be conducive to the integrated level of raising system, therefore, the research of differential antennae is of great practical significance and good application
Prospect.
With the development of present mobile communication, there is the situation of coexistence of communication systems of a variety of work in different frequency range,
Dual-band antenna can meet the communication system requirements of multiple types using common antenna, and cost of manufacture can be saved by having, and reduce day
The advantages that line occupied area, reduction communication system complexity.In wireless network access field, WiMAX and Wi-Fi are vertical at this stage
Handoff technique has been exploited.If Wi-Fi system and WiMAX system can work at the same time, it can realize remote
Transmission, the broadband access of high speed, and there is flexibility and mobility.Therefore, WLAN/WiMAX dual-band antenna is as wireless local area
One of net system core component, research have theory significance and practical value.
There are mainly two types of the implementation methods of common differential feed dual-band antenna, is trap antenna and element antenna respectively.
Trap antenna has many advantages, such as that structure is simple, easily fabricated, but trap antenna is usually omnidirectional antenna, and gain is lower and direction
Scheme unstable；Element antenna is usually the combination of multiple independent oscillators, needs to be arranged multiple feed ports, increases answering for system
Polygamy, and element antenna is mostly stereochemical structure, shared swept area is larger, is not easy to arrange on a large scale in practical situations.
Utility model content
The shortcomings that the main purpose of the utility model is to overcome the prior arts and deficiency, provide a kind of differential feed double frequency
Flat plane antenna is a kind of using planar structure, radiation gain height, and the differential feed double-frequency planar antenna that directional diagram is stable, should
Antenna can cover 2.45-GHz and 3.5-GHz frequency range.
The purpose of this utility model is realized by the following technical solution:
A kind of differential feed double-frequency planar antenna, including reflecting plate, support construction, the first feeder line, the second feeder line, medium base
Plate, antenna radiation unit；
The reflecting plate is pedestal, using metal plate；
The medium substrate is fixed on reflecting plate by support construction；The radiating element is etched on medium substrate；
The first feeder line connection reflecting plate and medium substrate, the second feeder line connection reflecting plate and medium substrate；
The antenna radiation unit includes the first bowknot oscillator, the second bowknot oscillator, the first long-armed oscillator, the second length
Arm oscillator, feed microstrip line structure；The first bowknot oscillator and the second bowknot oscillator are symmetrical；First long-armed oscillator and
The connection of one bowknot oscillator, the second long-armed oscillator and the second bowknot oscillator are in succession；First long-armed oscillator and the second long-armed oscillator
Symmetrically；The feed microstrip line structure is not coplanar with the first bowknot oscillator and the second bowknot oscillator.
Preferably, antenna radiation unit is axially symmetric structure, and symmetry axis is horizontally through the center of antenna radiation unit；
Preferably, the first bowknot oscillator is opposite with the narrow end of the second bowknot oscillator, about in antenna radiation unit
The heart is symmetrical；First bowknot oscillator and the second bowknot oscillator are etched in the back side of medium substrate；
Preferably, the first long-armed oscillator is in the thicker end of the first bowknot oscillator, and the second long-armed oscillator is in the second bowknot
The thicker end of oscillator, the first long-armed oscillator and the second long-armed oscillator are about antenna radiation unit central symmetry；First long-armed oscillator
The back side of medium substrate is etched in the second long-armed oscillator；
Preferably, feed microstrip line structure is metal stub, and the symmetrical axial symmetry about antenna radiation unit, with the
One bowknot oscillator and the second bowknot oscillator are parallel；Feed microstrip line structure is etched in the front of medium substrate；
Preferably, the characteristic impedance of feed microstrip line structure is 50 Ω；
Preferably, medium substrate uses high frequency plate Rogers4350B, and with a thickness of 0.76mm, relative dielectric constant is
3.48；
Preferably, the inner core of the first feeder line and the second feeder line pass through non-metallic via hole respectively with feed microstrip line structure
Both ends connection；
Preferably, it is insulating materials that support construction, which includes M root support column, M >=4, and support column,；
Preferably, insulating materials is plastics；
Preferably, reflecting plate is aluminium sheet.
The utility model compared with prior art, is had the following advantages and beneficial effects:
The utility model uses differential feed, avoids the use of balun, to reduce due to caused by the use of balun
Radio-frequency front-end loss improves antenna efficiency, while using planar structure, using set oscillator, reduces feed port, reduces radiation
Area improves radio-frequency front-end integrated level, and structure is simple, is easy to make, and is easy to arrange on a large scale in practical situations；The present invention can be covered
Two frequency ranges of lid WLAN 2.4-GHz, WiMAX3.5-GHz, and gain reaches in the frequency range of 2.40-2.48GHz
8.8dBi or more, gain reaches 9.7dBi or more in 3.4-3.6GHz frequency range, while having stable directional diagram.
Detailed description of the invention
Fig. 1 is a kind of schematic perspective view of differential feed double-frequency planar antenna of the present invention.
Fig. 2 is a kind of sectional view of differential feed double-frequency planar antenna of the present invention.
Fig. 3 is a kind of front view of differential feed double-frequency planar antenna of the present invention.
Fig. 4 is a kind of impedance bandwidth schematic diagram of differential feed double-frequency planar antenna of the present invention.
Fig. 5 is a kind of gain schematic diagram of differential feed double-frequency planar antenna of the present invention.
Fig. 6 is a kind of radiation face view directional diagram of the differential feed double-frequency planar antenna of the present invention in 2.45GHz.
Fig. 7 is a kind of radiation left view face directional diagram of the differential feed double-frequency planar antenna of the present invention in 2.45GHz.
Fig. 8 is a kind of radiation left view face directional diagram of the differential feed double-frequency planar antenna of the present invention in 3.5GHz.
Fig. 9 is a kind of radiation face view directional diagram of the differential feed double-frequency planar antenna of the present invention in 3.5GHz.
In figure, 1- radiating element, 2- reflecting plate, the first feeder line of 3A-, the second feeder line of 3B-, 4- support structure, 5A- first
Bowknot oscillator, 5B- the second bowknot oscillator, the long-armed oscillator of 6A- first, the long-armed oscillator of 6B- second, 7- feed microstrip line knot
Structure, 8- medium substrate, the non-metallic via hole of 9A- first, the non-metallic via hole of 9B- second.
Specific embodiment
The present invention will be further described in detail with reference to the embodiments and the accompanying drawings, but the implementation of the utility model
Mode is without being limited thereto.
Embodiment 1
As shown in Figure 1, a kind of differential feed double-frequency planar antenna, including reflecting plate 2, support construction 4, the first feeder line 3A,
Second feeder line 3B, medium substrate 8, antenna radiation unit 1；
Reflecting plate 2 selects aluminium sheet using metal plate for pedestal here；
Medium substrate 8 is fixed on reflecting plate 2 by support construction 4；Radiating element 1 is etched on medium substrate 8；Medium
Substrate 8 uses high frequency plate Rogers4350B, with a thickness of 0.76mm, relative dielectric constant 3.48；
First feeder line 3A connection reflecting plate 2 and medium substrate 8, the second feeder line 3B connection reflecting plate 2 and medium substrate 8, such as
Shown in Fig. 2；First feeder line 3A and the second feeder line 3B is respectively fed into that amplitude is equal, differential signal of phase phase difference 180 degree；First feedback
Line 3A and the second feeder line 3B uses soft coaxial, and the first feeder line 3A inner core passes through non-metallic via hole 9A and feed microstrip line knot
One end of structure 7 is welded, and the second feeder line 3B inner core is welded by non-metallic via hole 9B and the other end of feed microstrip line structure 7；
The outer core of first feeder line 3A and the second feeder line 3B are welded with the first bowknot oscillator 5A and the second bowknot oscillator 5B respectively.
Antenna radiation unit 1 includes the first bowknot oscillator 5A, the second bowknot oscillator 5B, the first long-armed oscillator 6A, the
Two long-armed oscillator 6B, feed microstrip line structure 3；The first bowknot oscillator 5A and the second bowknot oscillator 5B are symmetrical；First
Long-armed oscillator 6A is connect with the first bowknot oscillator 5A, and the second long-armed oscillator 6A and the second bowknot oscillator 6B are in succession；First is long
The long-armed oscillator 6B of arm oscillator 6A and second is symmetrical；Feed microstrip line structure 7 connects the first bowknot oscillator 5A and the second bowknot
Oscillator 5B.
Antenna radiation unit 1 is axially symmetric structure, and symmetry axis passes through the center of antenna radiation unit 1；Wherein, first
Bowknot oscillator 5A is opposite with the narrow end of the second bowknot oscillator 5B, about 1 central symmetry of antenna radiation unit, and the first butterfly
Butterfly knot oscillator 5A and the second bowknot oscillator 5B is etched in the back side of medium substrate 8；First long-armed oscillator 6A is connected to the first butterfly
The thicker end of butterfly knot oscillator 5A, the second long-armed oscillator 6B are connected to the thicker end of the second bowknot oscillator 5B, the first long-armed oscillator
The long-armed oscillator 6B of 6A and second is about 1 central symmetry of antenna radiation unit, and the first long-armed long-armed oscillator 6B of oscillator 6A and second
It is etched in the back side of medium substrate 8；Band line feed structure 7 is metal stub, and band line feed structure 7 is about antenna radiation unit
1 symmetrical axial symmetry, it is parallel with the first bowknot oscillator 5A and the second bowknot oscillator 5B, and feed microstrip line structure 7 etches
In the front of medium substrate 8, as shown in Figure 3.
As shown in figure 4, being the impedance bandwidth of the present embodiment, by figure it may be concluded that differential feed double frequency of the invention
Flat plane antenna has 2.37-2.51GHz, the impedance bandwidth of 3.36-3.70GHz, and return loss reaches -15dB substantially, can cover
The 2.40-2.48GHz frequency range of WLAN and the 3.4-3.6GHz frequency range of WiMAX, and by as shown in Figure 5, it is known that the present embodiment exists
Gain reaches 8.8dBi or more in the frequency range of 2.40-2.48GHz, and gain reaches 9.7dBi or more in 3.4-3.6GHz frequency range.
As shown in Figure 6 and Figure 7, using Fig. 2 as front view, Fig. 6 be this example 2.4GHz frequency range center frequency point gain just
Face directional diagram, Fig. 7 are gain left view face directional diagram of this example in 2.4GHz frequency range center frequency point, as seen from the figure, differential feed
Double-frequency planar antenna has stable radiation direction gain diagram, and front and back is compared greater than 15dB, and antenna is suitable for wlan system.
As shown in Figure 8 and Figure 9, using Fig. 2 as front view, Fig. 8 is that this example is left in the gain of 3.5GHz frequency range center frequency point
Depending on face directional diagram, Fig. 9 is gain positive direction figure of this example in 3.5GHz frequency range center frequency point, is this example in 3.5GHz frequency
The gain pattern of section center frequency point, as seen from the figure, differential feed double-frequency planar antenna of the invention has stable radiation side
To gain diagram, front and back is compared greater than 20dB, and antenna is suitable for WiMAX system.
The present embodiment only uses a radiating element that can realize that two frequency ranges obtain the impedance bandwidth of 15dB, has simple
Planar structure, production is simple；And the present embodiment is conducive to integrated with radio-frequency front-end by differential feed；Bandwidth of operation
Greatly, impedance bandwidth can cover the 2.40-2.48GHz frequency range of WLAN and the 3.4-3.6GHz frequency range of WiMAX, and antenna gain is high, together
When antenna pattern stablize.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (9)
1. a kind of differential feed double-frequency planar antenna, which is characterized in that including reflecting plate, support construction, the first feeder line, the second feedback
Line, medium substrate, antenna radiation unit；
The reflecting plate is pedestal, using metal plate；
The medium substrate is fixed on reflecting plate by support construction；The radiating element is etched on medium substrate；
The first feeder line connection reflecting plate and medium substrate, the second feeder line connection reflecting plate and medium substrate；
The antenna radiation unit is axially symmetric structure, and symmetry axis is horizontally through the center of antenna radiation unit；The day
Beta radiation unit includes the first bowknot oscillator, the second bowknot oscillator, the first long-armed oscillator, the second long-armed oscillator, microstrip line
Feed structure；The first bowknot oscillator and the second bowknot oscillator are symmetrical；First long-armed oscillator and the first bowknot oscillator
Connection, the second long-armed oscillator and the second bowknot oscillator are in succession；First long-armed oscillator and the second long-armed oscillator are symmetrical；The micro-strip
Line feed structure is not coplanar with the first bowknot oscillator and the second bowknot oscillator.
2. a kind of differential feed double-frequency planar antenna according to claim 1, which is characterized in that the first bowknot vibration
Son is opposite with the narrow end of the second bowknot oscillator, about antenna radiation unit central symmetry；First bowknot oscillator and second
Bowknot oscillator is etched in the back side of medium substrate.
3. a kind of differential feed double-frequency planar antenna according to claim 1, which is characterized in that the first long-armed oscillator
In the thicker end of the first bowknot oscillator, the second long-armed oscillator the second bowknot oscillator thicker end, the first long-armed oscillator with
Second long-armed oscillator is about antenna radiation unit central symmetry；First long-armed oscillator and the second long-armed oscillator are etched in medium substrate
The back side.
4. a kind of differential feed double-frequency planar antenna according to claim 1, which is characterized in that the feed microstrip line knot
Structure is metal stub, and symmetrical axial symmetry of the feed microstrip line structure about antenna radiation unit is shaken with the first bowknot
Son is parallel with the second bowknot oscillator, and feed microstrip line structure is etched in the front of medium substrate.
5. a kind of differential feed double-frequency planar antenna according to claim 4, which is characterized in that the feed microstrip line knot
The characteristic impedance of structure is 50 Ω.
6. a kind of differential feed double-frequency planar antenna according to claim 1, which is characterized in that first feeder line and
The inner core of two feeder lines passes through non-metallic via hole and connect respectively with the both ends of feed microstrip line structure.
7. a kind of differential feed double-frequency planar antenna according to claim 1, which is characterized in that the support construction includes
M root support column, M >=4, the support column are insulating materials.
8. a kind of differential feed double-frequency planar antenna according to claim 7, which is characterized in that the insulating materials is modeling
Material.
9. a kind of differential feed double-frequency planar antenna according to claim 1, which is characterized in that the reflecting plate is aluminium
Plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820755371.4U CN208368725U (en) | 2018-05-21 | 2018-05-21 | A kind of differential feed double-frequency planar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820755371.4U CN208368725U (en) | 2018-05-21 | 2018-05-21 | A kind of differential feed double-frequency planar antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208368725U true CN208368725U (en) | 2019-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820755371.4U Expired - Fee Related CN208368725U (en) | 2018-05-21 | 2018-05-21 | A kind of differential feed double-frequency planar antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448245A (en) * | 2018-05-21 | 2018-08-24 | 华南理工大学 | A kind of differential feed double-frequency planar antenna |
-
2018
- 2018-05-21 CN CN201820755371.4U patent/CN208368725U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448245A (en) * | 2018-05-21 | 2018-08-24 | 华南理工大学 | A kind of differential feed double-frequency planar antenna |
| CN108448245B (en) * | 2018-05-21 | 2023-09-29 | 华南理工大学 | Differential feed dual-frequency planar antenna |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190111 Termination date: 20190521 |
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| CF01 | Termination of patent right due to non-payment of annual fee |