CN209516001U - A kind of differential feed size three-frequency planar antenna - Google Patents
A kind of differential feed size three-frequency planar antenna Download PDFInfo
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- CN209516001U CN209516001U CN201920129128.6U CN201920129128U CN209516001U CN 209516001 U CN209516001 U CN 209516001U CN 201920129128 U CN201920129128 U CN 201920129128U CN 209516001 U CN209516001 U CN 209516001U
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Abstract
The utility model discloses a kind of differential feed size three-frequency planar antennas, including reflecting plate, support construction, medium substrate, the first feeder line, the second feeder line and antenna radiation unit；Reflecting plate is pedestal；Medium substrate is fixed on reflecting plate by support construction；Support construction includes M root support column, and support column is insulating materials；Antenna radiation unit is etched on medium substrate, including a low-frequency vibrator, the first intermediate frequency oscillator, the second intermediate frequency oscillator, the first high frequency oscillator, the second high frequency oscillator, coplanar microstrip line and feed microstrip line structure.The utility model uses differential feed structure combination planar structure, can realize that three frequencies work convenient for combining with differential radio frequency front end, have the advantages that high gain and antenna pattern are stable.
Description
Technical field
The utility model relates to mobile communication field more particularly to a kind of differential feed size three-frequency planar antennas.
Background technique
With the rapid development of recent decades communication system, requirement of the people to communication system is continuously improved.Antenna conduct
The core component of Modern Communication System, it was also proposed that increasingly higher demands.Traditional antenna majority is fed using single port
Mode generallys use balun (balun) difference to solve the integrated of single port antenna and radio-frequency front-end
Signal is converted to feed-in single port antenna after single port signal.And single port antenna limits the integrated RF using differential port
Front end using and popularizing.Differential antennae uses two feed ports, can be directly by two ports of antenna and differential ends
The radio-frequency front-end connection of mouth, to improve the integrated level of system, reduces signal in the loss of input port, improves antenna
Efficiency, while differential antennae uses full symmetric structure, has extremely low cross polarization.Therefore, the research tool of differential antennae
There are highly important realistic meaning and good application prospect.
With the development of present mobile communication, communications band is being continuously increased, it usually needs disposes more antennas to expire
The increasingly increased communication requirement of foot, and three-frequency antenna can meet the communication system requirements of multiple types using common antenna, tool
The advantages that cost of manufacture can be saved by having, and reduced antenna occupied area, reduced communication system complexity.It accesses and leads in wireless network
Domain, WiMAX and Wi-Fi Vertical Handoff Technology has been exploited at this stage.If Wi-Fi system and WiMAX system can be with
It works at the same time, it can realize remote transmission, the broadband access of high speed, and there is flexibility and mobility.Therefore, WLAN/
WiMAX three-frequency antenna has theory significance and practical value as one of wireless local area network (WLAN) system critical component, research.
There are mainly two types of the implementation methods of common differential feed three-frequency antenna, is ultra wide band filter antenna and more vibrations respectively
Sub-antenna.Ultra wide band filter antenna has many advantages, such as broader bandwidth, easily controllable bandwidth, but ultra wide band filter antenna structure is set
It counts complex, and there is the problems such as gain is lower, directional diagram is unstable；Multiwire antenna is usually the straight of multiple independent oscillators
Combination is connect, needs that independent feed port is arranged to each frequency range, increases the complexity of system, and element antenna is mostly solid
Structure, shared swept area is larger, is not easy to arrange on a large scale in practical situations.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of differential feed size three-frequency planar antenna.
The antenna uses planar structure, has the characteristics that radiation gain height and directional diagram are stable, can cover 2.45-GHz, 3.5-
GHz and 5-GHz frequency range.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of differential feed size three-frequency planar antenna, including reflecting plate, support construction, medium substrate, the first feeder line, the second feedback
Line and antenna radiation unit；
The reflecting plate is pedestal, using metal plate；
The medium substrate is fixed on reflecting plate by support construction, and support construction stationary plane is the back of medium substrate
Face；
The support construction includes M root support column, and support column is insulating materials, M >=4；
The antenna radiation unit is etched on medium substrate, including a low-frequency vibrator, the first intermediate frequency oscillator, in second
Frequency vibration, the first high frequency oscillator, the second high frequency oscillator, coplanar microstrip line and feed microstrip line structure；Low-frequency vibrator is about day
The central symmetry of beta radiation unit, extend T-shaped structure for end；First intermediate frequency oscillator and the second intermediate frequency oscillator pass through coplanar respectively
Microstrip line is connect with low-frequency vibrator, and the first intermediate frequency oscillator is symmetrical about low-frequency vibrator long side with the second intermediate frequency oscillator；First high frequency
Oscillator is connect by coplanar microstrip line with the first intermediate frequency oscillator, and the second high frequency oscillator passes through coplanar microstrip line and the second intermediate frequency oscillator
Connection, the first high frequency oscillator are symmetrical about low-frequency vibrator long side with the second high frequency oscillator；Feed microstrip line structure connects low frequency vibration
Two long sides of son, and it is not coplanar with low-frequency vibrator, intermediate frequency oscillator and high frequency oscillator.
First feeder line passes through reflecting plate and connects medium substrate；Second feeder line passes through reflecting plate and connects medium base
Plate；First feeder line inner core is welded by one end of non-metallic via hole and feed microstrip line structure, and the inner core of the second feeder line passes through
One end of non-metallic via hole and feed microstrip line structure is welded, the outer core of the outer core of the first feeder line and the second feeder line respectively with it is low
Two long sides of frequency vibration are welded.
Specifically, the low-frequency vibrator, intermediate frequency oscillator and high frequency oscillator are etched in the back side of medium substrate；The micro-strip
Line feed structure is etched in the front of medium substrate；The coplanar microstrip line is etched in the front of medium substrate.
Further, the antenna radiation unit is axially symmetric structure, and symmetry axis is horizontally through in antenna radiation unit
Heart position.
Further, two intermediate frequency oscillators are in parallel with low-frequency vibrator by coplanar microstrip line, and intermediate frequency oscillator one end is to low frequency
The opposite direction of oscillator is bent, and can be used in covering low frequency 2.45-GHz frequency range, intermediate frequency 3.5-GHz frequency range.
Further, two high frequency oscillators are in parallel with intermediate frequency oscillator by coplanar microstrip line, and high frequency oscillator one end is to low frequency
The direction of oscillator is bent, and can be used in covering low frequency 2.45-GHz frequency range, intermediate frequency 3.5-GHz frequency range, high frequency 5-GHz frequency range.
Further, the feed microstrip line structure is metal stub, symmetrical about antenna radiation unit, is shaken with low frequency
Sub- long side is parallel.
Preferably, the characteristic impedance of feed microstrip line structure is 50 Ω.
The utility model compared to the prior art, have it is below the utility model has the advantages that
1, differential feed technology is used in the utility model, is avoided as being damaged using radio-frequency front-end caused by balun
Consumption, improves antenna efficiency.Planar structure and set oscillator are used simultaneously, can reduce feed port, reduce swept area,
The advantages of improving radio-frequency front-end integrated level, have structure simple, being easy to make with extensive arrangement in practical situations.
2, the utility model can cover tri- frequencies of WLAN 2.45-GHz, 5-GHz frequency range and WiMAX3.5-GHz
Section, and gain can reach 8.0dBi or more in 2.40-5.51GHz frequency range, gain reaches in 3.40-3.60GHz frequency range
8.5dBi or more, gain reaches 8.0dBi or more in 5.14-6.05 frequency range, has stable directional diagram and extremely low cross-pole
The advantages of change.
Detailed description of the invention
Fig. 1 is a kind of schematic perspective view of differential feed size three-frequency planar antenna described in the utility model.
Fig. 2 is a kind of sectional view of differential feed size three-frequency planar antenna described in the utility model.
Fig. 3 is a kind of front view of differential feed size three-frequency planar antenna described in the utility model.
Fig. 4 is a kind of impedance bandwidth schematic diagram of differential feed size three-frequency planar antenna described in the utility model.
Fig. 5 is a kind of gain schematic diagram of differential feed size three-frequency planar antenna described in the utility model.
Fig. 6 (a) and Fig. 6 (b) is a kind of spoke of the differential feed size three-frequency planar antenna described in the utility model in 2.45GHz
Penetrate face view directional diagram and left view face directional diagram.
Fig. 7 (a) and Fig. 7 (b) is a kind of radiation of the differential feed size three-frequency planar antenna described in the utility model in 3.5GHz
Face view directional diagram and left view face directional diagram.
Fig. 8 (a) and Fig. 8 (b) is a kind of radiation of the differential feed size three-frequency planar antenna described in the utility model in 5.2GHz
Face view directional diagram and left view face directional diagram.
Fig. 9 (a) and Fig. 9 (b) is a kind of radiation of the differential feed size three-frequency planar antenna described in the utility model in 5.8GHz
Face view directional diagram and left view face directional diagram.
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 is high
Frequency vibration, 5B- the second high frequency oscillator, 6A- the first intermediate frequency oscillator, 6B- the second intermediate frequency oscillator, 7- low-frequency vibrator, the feedback of 8- microstrip line
Electric structure, the coplanar microstrip line of 9-, the non-metallic via hole of 10A- first, the non-metallic via hole of 10B- second, 11- medium substrate.
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
It is as shown in Figs. 1-3 a kind of structural schematic diagram of differential feed size three-frequency planar antenna, the antenna includes reflecting plate
2, support construction 4, the first feeder line 3A, the second feeder line 3B, medium substrate 11 and antenna radiation unit 1.
The reflecting plate is pedestal, using metal plate；
The medium substrate is fixed on reflecting plate by support construction, and support construction stationary plane is the back of medium substrate
Face；
The support construction includes M root support column, and support column is insulating materials, M >=4；
In the present embodiment, reflecting plate 3 uses aluminium sheet；Medium substrate 11 uses high frequency plate Rogers4350B, thickness
For 0.76mm, relative dielectric constant 3.48；Support column in support construction 4 uses plastics.
Medium substrate is fixed on reflecting plate by support construction, and antenna radiation unit is etched on medium substrate；First
Feeder line and the second feeder line are respectively fed into that amplitude is equal, the differential signal of phase phase difference 180 degree；First feeder line and the second feeder line are adopted
With soft coaxial, the first feeder line inner core passes through the welding of one end of non-metallic via hole 10A and feed microstrip line structure 8, the second feeder line
Inner core is welded by non-metallic via hole 10B and the other end of feed microstrip line structure；The outer core of first feeder line and the second feeder line
It is welded respectively with two long sides of low-frequency vibrator.
The antenna radiation unit is etched on medium substrate, including a low-frequency vibrator 7, the first intermediate frequency oscillator 6A,
Two intermediate frequency oscillator 6B, the first high frequency oscillator 5A, the second high frequency oscillator 5B, coplanar microstrip line 9 and feed microstrip line structure 8；It is low
Central symmetry of frequency vibration about antenna radiation unit, extend T-shaped structure for end, and extension end is the bottom end of low-frequency vibrator；The
One intermediate frequency oscillator and the second intermediate frequency oscillator pass through coplanar microstrip line respectively and connect with low-frequency vibrator, in the first intermediate frequency oscillator and second
Frequency vibration is symmetrical about low-frequency vibrator long side；First high frequency oscillator is connect by coplanar microstrip line with the first intermediate frequency oscillator, and second
High frequency oscillator is connect by coplanar microstrip line with the second intermediate frequency oscillator, and the first high frequency oscillator and the second high frequency oscillator shake about low frequency
Sub- long side is symmetrical；Feed microstrip line structure connect low-frequency vibrator two long sides, and not with low-frequency vibrator, intermediate frequency oscillator and high frequency vibrating
Son is coplanar.
Antenna radiation unit is axially symmetric structure, and symmetry axis is horizontally through the center of antenna radiation unit.Low frequency vibration
The bottom end of son is opposite, and about antenna radiation unit central symmetry, and low-frequency vibrator is etched in the back side of medium substrate；
Two intermediate frequency oscillators are in parallel with low-frequency vibrator by coplanar microstrip line, and two intermediate frequency oscillator one end are to low-frequency vibrator
Opposite direction bending, non-bending end be the first intermediate frequency oscillator and the second intermediate frequency oscillator bottom end.The bottom end of first intermediate frequency oscillator is logical
The bottom end that coplanar microstrip line is connected to low-frequency vibrator is crossed, the bottom end of the second intermediate frequency oscillator is connected to low frequency vibration by coplanar microstrip line
The bottom end of son, the first intermediate frequency oscillator and the second intermediate frequency oscillator about antenna radiation unit central symmetry, and the first intermediate frequency oscillator and
Second intermediate frequency oscillator is etched in the back side of medium substrate.
Two high frequency oscillators are in parallel with intermediate frequency oscillator by coplanar microstrip line, and two high frequency oscillator one end are to low-frequency vibrator
Direction bending, non-bending end be the first high frequency oscillator and the second high frequency oscillator bottom end.The bottom end of first high frequency oscillator passes through
Coplanar microstrip line is connected to the bottom end of the second intermediate frequency oscillator, and the bottom end connection of the second high frequency oscillator is connected to by coplanar microstrip line
The bottom end of second intermediate frequency oscillator, the first high frequency oscillator and the second high frequency oscillator are about antenna radiation unit central symmetry, and first
High frequency oscillator and the second high frequency oscillator are etched in the back side of medium substrate.
Feed microstrip line structure is metal stub, symmetry axis pair of the feed microstrip line structure about antenna radiation unit
Claim, it is parallel with low-frequency vibrator long side, and feed microstrip line structure is etched in the front of medium substrate.In the present embodiment, micro-strip
The characteristic impedance of line feed structure is 50 Ω.
As shown in figure 4, being the impedance bandwidth of the present embodiment, by figure it may be concluded that the differential feed of the utility model
Size three-frequency planar antenna has 2.40-2.51GHz, the impedance bandwidth of 3.40-3.60GHz, 5.14-6.05GHz, return loss base
Ben Da -15dB can cover the 2.40-2.48GHz frequency range of WLAN, the 3.4-3.6GHz frequency of 5.2-5.8GHz frequency range and WiMAX
Section, and by as shown in Figure 5, it is known that the present embodiment gain in the frequency range of 2.40-2.48GHz reaches 8.0dBi or more, in 3.4-
Gain reaches 8.5dBi or more in 3.6GHz frequency range, and gain reaches 8.0dBi or more in 5.2-5.8GHz frequency range.
As shown in Fig. 6 (a) and Fig. 6 (b), using Fig. 2 as left view, Fig. 6 (a) is this example in 2.4GHz frequency range center frequency point
Gain face view directional diagram, Fig. 6 (b) be this example 2.4GHz frequency range center frequency point gain left view face directional diagram, by scheming
It is found that differential feed size three-frequency planar antenna has stable radiation direction gain diagram, front and back is compared greater than 10dB, and antenna is suitable for
Wlan system.
As shown in Fig. 7 (a) and Fig. 7 (b), using Fig. 2 as left view, Fig. 7 (a) is this example in 3.5GHz frequency range center frequency point
Gain face view directional diagram, Fig. 7 (b) be this example 3.5GHz frequency range center frequency point gain left view face directional diagram, by scheming
It is found that differential feed size three-frequency planar antenna has stable radiation direction gain diagram, front and back is compared greater than 15dB, and antenna is suitable for
WiMAX system.
As shown in Fig. 8 (a) and Fig. 8 (b), using Fig. 2 as left view, Fig. 8 (a) is this example in 5.2GHz frequency range center frequency point
Gain face view directional diagram, Fig. 8 (b) be this example 5.2GHz frequency range center frequency point gain left view face directional diagram, by scheming
It is found that differential feed size three-frequency planar antenna has stable radiation direction gain diagram, front and back is compared greater than 15dB, and antenna is suitable for
Wlan system.
As shown in Fig. 9 (a) and Fig. 9 (b), using Fig. 2 as left view, Fig. 9 (a) is this example in 5.8GHz frequency range center frequency point
Gain face view directional diagram, Fig. 9 (b) be this example 5.8GHz frequency range center frequency point gain left view face directional diagram, by scheming
It is found that differential feed size three-frequency planar antenna has stable radiation direction gain diagram, front and back is compared greater than 15dB, and antenna is suitable for
Wlan system.
The present embodiment only uses a radiating element that can cover the impedance bandwidth that three frequency ranges obtain 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, the 3.4-3.6GHz frequency range of WiMAX and 5.2-5.8GHz frequency
Section, antenna gain is high, while antenna pattern is stablized.
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 (6)
1. a kind of differential feed size three-frequency planar antenna, which is characterized in that including reflecting plate, support construction, medium substrate, the first feedback
Line, the second feeder line and antenna radiation unit；
The reflecting plate is pedestal, using metal plate；
The medium substrate is fixed on reflecting plate by support construction, and support construction stationary plane is the back side of medium substrate；
The support construction includes M root support column, and support column is insulating materials, M >=4；
The antenna radiation unit is etched on medium substrate, including a low-frequency vibrator, the first intermediate frequency oscillator, frequency vibration in second
Son, the first high frequency oscillator, the second high frequency oscillator, coplanar microstrip line and feed microstrip line structure；Low-frequency vibrator is about antenna spoke
The central symmetry of unit is penetrated, extend T-shaped structure for end；First intermediate frequency oscillator and the second intermediate frequency oscillator pass through coplanar micro-strip respectively
Line is connect with low-frequency vibrator, and the first intermediate frequency oscillator is symmetrical about low-frequency vibrator long side with the second intermediate frequency oscillator；First high frequency oscillator
It is connect by coplanar microstrip line with the first intermediate frequency oscillator, the second high frequency oscillator is connected by coplanar microstrip line and the second intermediate frequency oscillator
It connects, the first high frequency oscillator is symmetrical about low-frequency vibrator long side with the second high frequency oscillator；Feed microstrip line structure connects low-frequency vibrator
Two long sides, and it is not coplanar with low-frequency vibrator, intermediate frequency oscillator and high frequency oscillator；
First feeder line passes through reflecting plate and connects medium substrate；Second feeder line passes through reflecting plate and connects medium substrate；The
One feeder line inner core is welded by one end of non-metallic via hole and feed microstrip line structure, and the inner core of the second feeder line passes through nonmetallic
The one end for changing via hole and feed microstrip line structure is welded, the outer core of the outer core of the first feeder line and the second feeder line respectively with low-frequency vibrator
Two long sides welded；
The low-frequency vibrator, intermediate frequency oscillator and high frequency oscillator are etched in the back side of medium substrate；The feed microstrip line structure
It is etched in the front of medium substrate；The coplanar microstrip line is etched in the front of medium substrate.
2. a kind of differential feed size three-frequency planar antenna according to claim 1, which is characterized in that the antenna radiation unit
For axially symmetric structure, symmetry axis is horizontally through the center of antenna radiation unit.
3. a kind of differential feed size three-frequency planar antenna according to claim 1, which is characterized in that two intermediate frequency oscillators pass through
Coplanar microstrip line is in parallel with low-frequency vibrator, and intermediate frequency oscillator one end is bent to the opposite direction of low-frequency vibrator.
4. a kind of differential feed size three-frequency planar antenna according to claim 1, which is characterized in that two high frequency oscillators pass through
Coplanar microstrip line is in parallel with intermediate frequency oscillator, and high frequency oscillator one end is bent to the direction of low-frequency vibrator.
5. a kind of differential feed size three-frequency planar antenna according to claim 1, which is characterized in that the feed microstrip line knot
Structure is metal stub, symmetrical about antenna radiation unit, parallel with low-frequency vibrator long side.
6. a kind of differential feed size three-frequency planar antenna according to claim 1, which is characterized in that feed microstrip line structure
Characteristic impedance is 50 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920129128.6U CN209516001U (en) | 2019-01-25 | 2019-01-25 | A kind of differential feed size three-frequency planar antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920129128.6U CN209516001U (en) | 2019-01-25 | 2019-01-25 | A kind of differential feed size three-frequency planar antenna |
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| CN209516001U true CN209516001U (en) | 2019-10-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742530A (en) * | 2019-01-25 | 2019-05-10 | 华南理工大学 | A kind of differential feed size three-frequency planar antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742530A (en) * | 2019-01-25 | 2019-05-10 | 华南理工大学 | A kind of differential feed size three-frequency planar antenna |
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Granted publication date: 20191018 Termination date: 20220125 |