CN107171078A - Circularly polarization microstrip duplexed antenna - Google Patents
Circularly polarization microstrip duplexed antenna Download PDFInfo
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- CN107171078A CN107171078A CN201710293074.2A CN201710293074A CN107171078A CN 107171078 A CN107171078 A CN 107171078A CN 201710293074 A CN201710293074 A CN 201710293074A CN 107171078 A CN107171078 A CN 107171078A
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- 230000010287 polarization Effects 0.000 title claims abstract description 42
- 239000000523 sample Substances 0.000 claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims description 27
- 230000009466 transformation Effects 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 238000007639 printing Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000011068 loading method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
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Abstract
The invention discloses a kind of circularly polarization microstrip duplexed antenna, including micro-strip paster antenna, two feed probes, duplexing power distributing network, sending port and receiving port；Two feed probes are connected with the duplexing power distributing network；The duplexing power distributing network includes power distribution microstrip line, sends microstrip bandstop filter, sends impedance conversion microstrip line, receives microstrip bandstop filter and receive impedance conversion microstrip line；The feed probes include horizontal micro-strip and vertical metal probe, and one end of the vertical metal probe connects the center of the horizontal micro-strip, and the other end of the vertical metal probe is connected with the power distribution microstrip line.The present invention devises a micro-strip circular polarisation duplexed antenna with duplex capability, and the transmitting of antenna is identical with the electromagnetic polarization mode that reception is used, and is left-hand circular polarization electromagnetic wave；Meanwhile, microstrip bandstop filter is sent and received by setting, the high-isolation between transmission and receiving port is realized.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of circularly polarization microstrip duplexed antenna.
Background technology
Antenna-feedback system be wireless communication system foremost, be the indispensable critical component of wireless communication system.Antenna feeder
System mainly includes antenna, wave filter and duplexer, and conventional method is that three is individually designed, is then attached again.Have the disadvantage
Three is required for matching network alone to be matched with 50 ohm of feeder lines, the problem of easily bringing big volume, total amount weight, together
When, excessive matching network, which is brought, is lost big shortcoming.
With the development of radio communication, communication system is increasingly intended to miniaturization and integrated, therefore, integrated day
Feedback system has great demand.Duplexed antenna, which combines the front-end devices such as antenna, wave filter, duplexer, to be designed, can
So that the structure of radio-frequency front-end system is compacter, reduces unnecessary loss and introduce so that the miniaturization of communication system and collection
It is more prone to realize into change.
In existing duplexed antenna, realize that the design method that duplexed antenna mainly combines duplexer using multifrequency antenna is real
Duplexed antenna is now filtered, or filtering duplexed antenna is realized by the design method of multimode antenna associated filters.Propose at present
The interval that is mainly between linear polarization duplexed antenna, and the transmitting receives frequency of antenna of duplexed antenna it is larger, interport isolation
Typically between 20-30dB, the gain of antenna is in below 5dBi.
Circular polarized antenna is for linear polarized antenna, and it can receive the electromagnetic wave of any direction, therefore, it is possible to have
Effect resists the multipath fading effect in radio communication and overcomes the polarization mismatch problem as caused by linear polarized antenna.Therefore, circle
Poliarizing antenna is in RFID, GPS, and the wireless communication system such as Beidou satellite system is widely used.
Therefore, current same polarization duplexed antenna not high, the antenna transmitting-receiving frequency interval that there is interport isolation on the whole
It is larger, the not high shortcoming of the gain of antenna.Moreover, current same polarization duplexed antenna is substantially linear polarization duplexed antenna, than
Rarer circular polarisation duplexed antenna.
The content of the invention
The technical problem to be solved in the present invention is there is provided a kind of circularly polarization microstrip duplexed antenna, with existing same polarization
Duplexed antenna is compared, and the transmitting of antenna and receives frequency interval are nearer, and the interport isolation that antenna transmitting is received is high, and antenna
Emission port transmitting electromagnetic wave and receiving port receive electromagnetic wave be circularly polarised wave.
In order to solve the above technical problems, the present invention provides following technical scheme：A kind of circularly polarization microstrip duplexed antenna, including
Micro-strip paster antenna, two feed probes, duplexing power distributing network, sending port and the receiving terminal for possessing duplex capability
Mouthful；Wherein
Two feed probes are connected with the duplexing power distributing network；
The duplexing power distributing network includes power distribution microstrip line, sends microstrip bandstop filter, sends impedance change
Microstrip line is changed, microstrip bandstop filter is received and receives impedance conversion microstrip line；It is described transmission microstrip bandstop filter one end with
The sending port is connected, the other end converts microstrip line by the transmission impedance and is connected with the power distribution microstrip line；Institute
State reception microstrip bandstop filter one end be connected with receiving port, the other end by it is described receive impedance conversion microstrip line with it is described
Power distribution microstrip line is connected；
The feed probes include horizontal micro-strip and vertical metal probe, and one end connection of the vertical metal probe is described
The center of horizontal micro-strip, the other end of the vertical metal probe is connected with the power distribution microstrip line.
Further, the feed probes are T-shaped feed probes, i.e., described horizontal micro-strip and vertical metal probe mutually hang down
It is direct-connected to connect.
Further, the transmission microstrip bandstop filter converts microstrip line and the power point by the transmission impedance
It is connected with microstrip line；Wherein, send impedance conversion microstrip line with it is at the link position of power distribution microstrip line that power distribution is micro-
Band line is divided into two sections of lines, and the difference of the length between this two sections of lines is λG is sent out/4；The reception microstrip bandstop filter is connect by described
Impedance conversion microstrip line is received with the power distribution microstrip line to be connected；Wherein, receive impedance conversion microstrip line and power distribution is micro-
Power distribution line is equally divided into two sections of lines at link position with line, the difference of length is λ between this two sections of linesG is received/4；Its
In, λG is sent outTo send wavelength of the signal on the power distribution microstrip line, λG is receivedTo receive signal in the power distribution microstrip line
On wavelength.
Further, the transmission microstrip bandstop filter includes two sections of first end open circuit microstrip lines and one section of first company
Microstrip line is connect, the two ends of the connection microstrip line connect two sections of first end open circuit microstrip lines respectively, and the first end is opened
The length and width of road microstrip line causes frequency to be fHairTransmission signal can by and frequency be fReceiveReception signal can not lead to
Cross, the length and width of the first connection microstrip line causes frequency to be fHairTransmission signal can by and frequency be fReceive's
Receiving signal can not pass through.
Further, the reception microstrip bandstop filter is by two sections of second ends open circuit microstrip lines and one section of second connection
Microstrip line is constituted, and the two ends of the second connection microstrip line connect two sections of second end open circuit microstrip lines, described second respectively
The length and width of terminal open circuit microstrip line causes frequency to be fReceiveReception signal can by and frequency be fHairTransmission signal
It can not pass through, the length and width of the second connection microstrip line causes frequency to be fReceiveReception signal can by and frequency
For fHairTransmission signal can not pass through.
Further, the working passband phase for sending microstrip bandstop filter and the reception microstrip bandstop filter
Instead, and the stop-band frequency for sending microstrip bandstop filter and the reception microstrip bandstop filter is opposite.
Further, the length and width for sending impedance conversion microstrip line meets claimed below：Meet and be in frequency
fReceiveReception signal conditioning under, when sending port connects matched load, send impedance conversion microstrip line and power distribution microstrip line
Connection end impedance close to open circuit.
Further, the length and width for receiving impedance conversion microstrip line meets claimed below：Meet and be in frequency
fHairTransmission signal conditioning under, when receiving port connects matched load, receive impedance conversion microstrip line and power distribution microstrip line
Connection end impedance close to open circuit.
Further, the transmission impedance conversion microstrip line and reception impedance conversion microstrip line work in different frequency；Institute
It is 35.4 Ω impedance transformation lines to state transmission impedance conversion microstrip line, and its length is λG is received/4；The reception impedance conversion microstrip line
For 35.4 Ω impedance transformation lines, its length is λG is sent out/4；Wherein, λG is sent outTo send ripple of the signal on the power distribution microstrip line
It is long, λG is receivedTo receive wavelength of the signal on the power distribution microstrip line.
Further, described circularly polarization microstrip duplexed antenna also includes two upper layer medium substrates being placed in parallel with
Layer medium substrate, reflection floor of the upper surface covered with metal of the layer dielectric substrate, bottom surface sets duplexing power distribution
Network；The micro-strip paster antenna is printed on the upper layer medium substrate upper surface；The horizontal microband printing of the probe is in institute
State the lower surface of upper layer medium substrate.
After adopting the above technical scheme, the present invention at least has the advantages that：
1st, power distributing network and the duplex network design of circular polarized antenna are combined together by the present invention, devise one
Not only there is duplex capability but also the duplexing power distributing network with power dividing function；The emission port and receiving terminal of antenna
Mouthful power distribution and signal phase shift it is common close to the quarter-wave power of low frequency operation frequency band by one section
Microstrip line is distributed to realize, therefore the structure of antenna is compact；Simultaneously the resistance filter of micro-strip band is sent by being set in sending port
Ripple device, sets in receiving port and receives microstrip bandstop filter, realizes the high-isolation between transmission and receiving port；
2nd, present invention transmitting is coupled with the signal received by the micro-strip on T-shaped probe with paster antenna, due to
After overpower point distribution microstrip line phase shift, the phase of the signals of two ports in the horizontal micro-strip of two T-shaped probes is
Micro-strip is that to be ahead of micro-strip be the probe on y directions for the tip phase in x directions, it is achieved that transmitting receives same polarization, and
For circular polarisation；
3rd, present invention transmission reception mutual interference is small, passes through and is sending insertion between microstrip bandstop filter and power distribution microstrip line
Impedance conversion microstrip line is sent, transmitting branch will not produce influence to the reception signal on power distribution microstrip line；By connecing
Receive insertion between microstrip bandstop filter and power distribution microstrip line and receive impedance conversion microstrip line, enable in sending port work
When making, receiving branch will not produce influence to the transmission signal on power distribution microstrip line.Therefore, the mutual interference between receiving is sent
It is smaller；
4th, existing same polarization duplexed antenna, the design method for being normally based on bandpass filter is designed, and band logical
Filter passband is compared with the design focused in passband, and outside the closer band of passband, the effect that suppression signal passes through is general
It is not fine, and the Out-of-band rejection for wanting to improve bandpass filter usually requires to increase the exponent number of bandpass filter so that filtering
The design of device is more complicated, size increase；And the present invention designs like-polarized circular polarisation duplex using the method for bandstop filter
Antenna, its frequency band in the side nearer apart from passband can produce transmission zero, suppress effect that signal passes through preferably, therefore
Smaller transmission receives frequency interval can be realized, and keeps preferably transmitting to receive isolation characteristic.
Brief description of the drawings
Fig. 1 is the general construction schematic diagram of circularly polarization microstrip duplexed antenna of the present invention and the numbering mark of chief component
Note；
Fig. 2 is the general construction schematic diagram of circularly polarization microstrip duplexed antenna of the present invention and the numbering mark of refinement；
Fig. 3 is the front section view of circularly polarization microstrip duplexed antenna of the present invention；
Fig. 4 is the top view of the upper layer medium substrate of circularly polarization microstrip duplexed antenna of the present invention；
Fig. 5 is the upward view of the upper layer medium substrate of circularly polarization microstrip duplexed antenna of the present invention；
Fig. 6 is the top view of the layer dielectric substrate of circularly polarization microstrip duplexed antenna of the present invention；
Fig. 7 is the upward view of the layer dielectric substrate of circularly polarization microstrip duplexed antenna of the present invention；
Fig. 8 is the size marking figure of the upper layer medium substrate surface structure of circularly polarization microstrip duplexed antenna of the present invention；
Fig. 9 is the size marking figure of the upper layer medium substrate lower surface configuration of circularly polarization microstrip duplexed antenna of the present invention；
Figure 10 is the size marking figure of the layer dielectric upper surface of base plate structure of circularly polarization microstrip duplexed antenna of the present invention；
Figure 11 is the size marking figure of power distribution line on the layer dielectric substrate of circularly polarization microstrip duplexed antenna of the present invention；
Figure 12 is the emulation S parameter curve map that the present embodiment sends bandstop filter example；
Figure 13 is the emulation S parameter curve map that the present embodiment receives bandstop filter example；
Figure 14 is that the present embodiment sends the emulation S parameter of conversion microstrip line linkup transmit microstrip bandstop filter, Yi Jifa
Sending end mouthful connects the impedance diagram after matched load；
Figure 15 is that the present embodiment receives the emulation S parameter of conversion microstrip line connection reception microstrip bandstop filter, Yi Jijie
Receiving end mouthful connects the impedance diagram after matched load；
Figure 16 is the test S parameter curve map of the present embodiment circularly polarization microstrip duplexed antenna；
Figure 17 (a) is the xoz faces emulation directional diagram that the present embodiment receiving port (2.2GHz) is encouraged；
Figure 17 (b) is the yoz faces emulation directional diagram that the present embodiment receiving port (2.2GHz) is encouraged；
Figure 18 (a) is the xoz faces emulation directional diagram that the present embodiment sending port (2.4GHz) is encouraged；
Figure 18 (b) is the yoz faces emulation directional diagram that the present embodiment sending port (2.4GHz) is encouraged；
Figure 19 is the simulated gain of the present embodiment antenna with frequency variation curve；
Figure 20 is the emulation axle ratio of the present embodiment antenna with frequency variation curve figure.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combine, the application is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Reference picture 1, Fig. 2 and Fig. 3, the present invention provide a kind of like-polarized circularly polarization microstrip duplexed antenna, including one just
Square micro-strip paster antenna 1, two be used for the T-shaped probe 2, the power distributing network 3 with duplex capability, the hair that feed
Sending end mouthful 31 and receiving port 32, the duplexing power distributing network 3 include power distribution microstrip line 4, send the resistance of micro-strip band
Wave filter 7, send impedance conversion microstrip line 5,
Receive microstrip bandstop filter 8 and receive impedance conversion microstrip line 6.
The one end for sending microstrip bandstop filter 7 is connected with sending port 31, and the other end converts micro-strip by sending impedance
Line 5 and power distribution microstrip line 4 are λ in the difference of the length apart from power distribution microstrip line two endsG is sent outIt is connected at/4 position, λG is sent out
To send wavelength of the signal on power distribution microstrip line 4.
The one end for receiving microstrip bandstop filter 8 is connected with receiving port 32, and the other end converts micro-strip by receiving impedance
Line 6 and power distribution microstrip line 4 are λ in the difference of the length apart from power distribution microstrip line two endsG is receivedIt is connected at/4 position, λG is received
To receive wavelength of the signal on power distribution microstrip line 4.
It is that two sections of left and right works at different frequencies to send impedance and convert microstrip line 5 and receive impedance conversion microstrip line 6
Length is λG is received/ 4 and λG is sent out/ 4 35.4 Ω impedance transformation lines.It is two sections of low-impedance transmissions respectively after micro-strip impedance transformation line 5,6
Line 20,23, is then connected to two ports of radio system by two section of 50 Ω transmission line 24,25.The L-type of four sections of loadings is whole
End open circuit minor matters line 18,19,21,22 is carried in the two ends of two sections of low-impedance lines 20,23 respectively, is constituted with two sections of low-impedance lines
Two bandstop filters of transmitting and receiving terminal mouthful.The working passband of two bandstop filters and stop-band frequency contrast.
Microstrip bandstop filter 7 is sent to be made up of the microstrip line 18,19 of two sections of terminal open circuits and one section of connection microstrip line 20,
Connection microstrip line 20 two ends connect two open circuit microstrip lines 18,19 respectively.Terminal open circuit microstrip line 18,19 and connection microstrip line 20
Length and width make it that in frequency be f by reasonable selectionHairTransmission signal can by and frequency be fReceiveReception signal not
It can pass through.As an example, when requiring fHair=2.4GHz, fReceiveDuring=2.2GHz, relative dielectric constant can be used for 2.55,
Thickness makees substrate for h=0.8mm dielectric-slab, and the length of open circuit microstrip line 18 takes 26.5mm, width to take 0.5mm, micro-strip of opening a way
The length of line 19 takes 26.04mm, width to take 0.5mm, and the length of connection microstrip line 20 takes 25.7mm, width to take 9mm, Figure 12 to be these
The S parameter of transmission microstrip bandstop filter when individual, it can be seen that its S12 is -1.95dB, in frequency when frequency is 2.4GHz
Its S12 is -40.8dB when rate is 2.2GHz, realizes and obstructs the function of receiving signal by sending signal.
Microstrip bandstop filter 8 is received to be made up of the microstrip line 21,22 of two sections of terminal open circuits and one section of connection microstrip line 23,
Connection microstrip line 23 two ends connect two open circuit microstrip lines 21,22 respectively.Terminal open circuit microstrip line 21,22 and connection microstrip line 23
Length and width make it that in frequency be f by reasonable selectionReceiveReception signal can by and frequency be fHairTransmission signal not
It can pass through.As an example, when requiring fHair=2.4GHz, fReceiveDuring=2.2GHz, relative dielectric constant can be used for 2.55,
Thickness makees substrate for h=0.8mm dielectric-slab, and the length of open circuit microstrip line 21 takes 26.8mm, width to take 0.5mm, micro-strip of opening a way
The length of line 22 takes 26.19mm, width to take 0.5mm, and the length of connection microstrip line 23 takes 25.5mm, width to take 14mm, Tu13Shi
This when reception microstrip bandstop filter S parameter, it can be seen that when frequency is 2.2GHz its S12 be -1.65dB,
Its S12 is -41.5dB when frequency is 2.4GHz, realizes and obstructs the function of sending signal by receiving signal.
Send impedance and convert microstrip line 5 by suitably choosing its length and width, it is ensured that be f for frequencyReceiveReception letter
For number, it is very big (close in the impedance (when sending port 31 connects matched load) with the connection end of power distribution microstrip line 4
Open circuit), from without influenceing frequency to be fReceiveReceive transmission of the signal on power distribution microstrip line 4.As an example, when requiring
fHair=2.4GHz, fReceiveDuring=2.2GHz, relative dielectric constant can be used to do base for the dielectric-slab that 2.55, thickness is h=0.8mm
Plate, the length for sending impedance conversion microstrip line 5 takes 23.5mm, width to take 3.67mm, connects above-mentioned transmission micro-strip bandreject filtering
It is as shown in figure 14 that the example of device, its S parameter and sending port 31 connect the impedance after matched load.It can be seen that, in fReceive=
During 2.2GHz, impedance is more than 1000 ohm, and is f for frequencyHair=2.4GHz transmission signal is then decayed seldom.
Receive impedance and convert microstrip line 6 by suitably choosing its length and width, it is ensured that be f for frequencyHairTransmission letter
For number, it is very big (close in the impedance (when receiving port 32 connects matched load) with the connection end of power distribution microstrip line 4
Open circuit), from without influenceing frequency to be fHairSend transmission of the signal on power distribution microstrip line 4.It is used as an example, fHair=
2.4GHz, fReceiveDuring=2.2GHz, relative dielectric constant can be used to make substrate for the dielectric-slab that 2.55, thickness is h=0.8mm,
The length for receiving impedance conversion microstrip line 6 takes 19.5mm, width to take reception microstrip bandstop filter above-mentioned in 3.67mm, connection
Example, it is as shown in figure 15 that its S parameter and receiving port 32 connect the impedance after matched load.It can be seen that, in fReceive=
During 2.4GHz, impedance is more than 1000 ohm, and is f for frequencyHair=2.2GHz reception signal is then decayed seldom.
The circularly polarization microstrip duplexed antenna, in addition to two upper layer medium substrates 9 and layer dielectric base being placed in parallel
Plate 11, reflection floor 10 of the upper surface covered with metal of layer dielectric substrate 11, bottom surface sets the anti-phase power point of this antenna
Distribution network 3.
The micro-strip paster antenna 1 includes the square-shaped metal paster 1 for being printed on the upper surface of upper layer medium substrate 9.
Described T-shaped probe is by being printed on the metal micro-strip 12,13 of the lower surface of upper layer medium substrate 9 and being connected on metal micro-strip
12nd, the metal probe 14,15 at 13 centers is constituted, and the other end of metal probe 14,15 is each passed through reflection floor 10 and lower floor is situated between
Through hole 16,17 on matter substrate 11 is connected with the two ends of power distribution microstrip line 4.
When sending, send signal to send into from sending port 31, become by sending microstrip bandstop filter 7 and sending impedance
Change the feeding power distribution microstrip line of microstrip line 5.By the signal of power distribution microstrip line by with identical amplitude, difference 90 degree
Phase assignments are coupled to radiation patch at two T-shaped probes 12,13,14,15 by the micro-strip 12,13 on T-shaped probe
1.Because two micro-strips 12,13 are disposed vertically, the mutually orthogonal electromagnetic wave of two spaces can have been encouraged in radiation patch.Again
Due to equal, 90 degree of the phase difference, therefore, it is possible in radiation by the signal amplitude at feeding network two micro-strips 12,13 of arrival
The electromagnetic wave of a circular polarisation has been encouraged on paster.
When 330 receiving, receive signal to receive at radiation patch antenna 1, and be coupled to T-shaped probe 12,13,14,15.Connect
The collection of letters number is fed to a two ends for power distribution microstrip line 4 after T-shaped probe 12,13,14,15.Now, power distribution micro-strip
The signal at the two ends of line 4 is also that amplitude is equal, and phase differs 90 degree.The signal at the two ends of power distribution microstrip line 4 is respectively through phase
The power distribution microstrip line of 90 degree of difference is reached when receiving impedance conversion microstrip line 6 just with identical Phase Stacking, is passed through after
Cross reception impedance conversion microstrip line 6 and receive microstrip bandstop filter 8, exported from receiving port 32.
Fig. 4, Fig. 5, Fig. 6, Fig. 7 are respectively the electrical structure diagram of two medium substrate upper and lower surfaces, and striped filling part is divided into
The structure of conductive copper covering, remainder is medium substrate.
Fig. 8, Fig. 9, Figure 10, Figure 11 are the size marking figure of each several part electrical structure.
With reference to Fig. 2, Fig. 8, Fig. 9, Figure 10, Figure 11 size marking, the design parameter of antenna is as follows in the present embodiment：Two
The material of dielectric-slab is identical with size, and thickness c is 0.8mm, and width b is 120mm, and length a is 120mm.Between two dielectric-slabs
Height h be 8mm.The length of side 1a of square patch and the spacing apart from dielectric-slab edge are respectively 47.5mm, 36.25mm.Two
The individual long 2a of elongated micro-strip, the width 2b for being used to couple, apart from 2c is respectively 2mm, 6.5mm, 49mm apart from dielectric-slab edge.Power
Key dimension 4a, 4b, 4c, the 4d for distributing network are respectively 27.85mm, 2.3mm, 4.75mm, 2.18mm.Two section of 35.4 Ω resistance
The length 5a and 6a of resistance thread-changing are respectively 23.5mm and 19.5mm, and width 5b, 6b are 3.67mm.The L of four sections of terminal open circuits
The width 18b of type minor matters line is 0.5mm, length 18a, 19a, 21a, 22a be respectively 26.5mm, 26.04mm, 26.8mm,
26.19mm.Length 20a, 23a and width 20b, 23b of two sections of low-impedance transmissions are respectively 25.7mm, 25.5mm, 9mm, 14mm.
Length 24a, 25a for being connected to two sections of transmission lines of port is respectively 9.65mm, 13.85mm, and width is respectively 2.25mm.The day
The sending port 31 of line is operated in 2.4GHz frequency band.Receiving port 32 is operated in 2.2GHz frequency band.In two frequency bands, two
The isolation of individual port is all higher than 43dB, as shown in figure 16.In the range of two working bands, the gain of antenna, which is substantially all, to be more than
6dBi, cross polarization is more than 15dB, shown in the emulation testing directional diagram 17, Figure 18 such as antenna.In the work of receiving port 32 of antenna
When making, gain of the antenna at the working frequency 2.2GHz of sending port 31 is 6.1dBi, and in the working frequency of sending port 31
Gain at 2.4GHz has then been quickly fallen to below -30dBi, and gain inequality has reached more than 35dB, such as Figure 19.Similarly, in day
When the sending port 31 of line works, gain of the antenna at the working frequency 2.4GHz of sending port 31 is 6.9dBi, and is being received
Gain at the working frequency 2.2GHz of port 32 has also been quickly fallen to below -30dBi, gain inequality equally reached 35dB with
On, as shown in figure 19, the port 1 shown in figure represents sending port 31, port 2 and represents receiving port 32.In the transmission of antenna
When port 31 works, antenna is in the operating frequency range of sending port 31, and axle ratio is less than 1.8dB；In the sending port 31 of antenna
During work, antenna is in the operating frequency range of sending port 31, and axle ratio is less than 2.2dB, as shown in figure 20, the port shown in figure
1, which represents sending port 31, port 2, represents receiving port 32, and two ports of antenna show good circular polarization characteristics.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understand, can carry out a variety of equivalent changes to these embodiments without departing from the principles and spirit of the present invention
Change, change, replace and modification, the scope of the present invention is limited by appended claims and its equivalency range.
Claims (10)
1. a kind of circularly polarization microstrip duplexed antenna, it is characterised in that including micro-strip paster antenna, two feed probes, possess double
Duplexing power distributing network, sending port and the receiving port of work function；Wherein
Two feed probes are connected with the duplexing power distributing network；
The duplexing power distributing network is micro- including power distribution microstrip line, transmission microstrip bandstop filter, transmission impedance conversion
Band line, reception microstrip bandstop filter and reception impedance conversion microstrip line；It is described transmission microstrip bandstop filter one end with it is described
Sending port is connected, the other end converts microstrip line by the transmission impedance and is connected with the power distribution microstrip line；It is described to connect
Receipts microstrip bandstop filter one end is connected with receiving port, the other end passes through the reception impedance and converts microstrip line and the power
Microstrip line is distributed to be connected；
The feed probes include horizontal micro-strip and vertical metal probe, and one end of the vertical metal probe connects the level
The center of micro-strip, the other end of the vertical metal probe is connected with the power distribution microstrip line.
2. circularly polarization microstrip duplexed antenna according to claim 1, it is characterised in that the feed probes are T-shaped feed
Probe, i.e., described horizontal micro-strip and vertical metal probe are mutually connected vertically.
3. circularly polarization microstrip duplexed antenna according to claim 1, it is characterised in that the transmission microstrip bandstop filter
Microstrip line is converted by the transmission impedance with the power distribution microstrip line to be connected；Wherein, send impedance conversion microstrip line with
Power distribution microstrip line is divided into two sections of lines at the link position of power distribution microstrip line, the difference of the length between this two sections of lines is
λG is sent out/4；The reception microstrip bandstop filter converts microstrip line and the power distribution microstrip line phase by the reception impedance
Even；Wherein, receiving impedance conversion, microstrip line is same with the link position of power distribution microstrip line that power distribution line is divided into two
The difference of length is λ between section line, this two sections of linesG is received/4；Wherein, λG is sent outTo send signal on the power distribution microstrip line
Wavelength, λG is receivedTo receive wavelength of the signal on the power distribution microstrip line.
4. the circularly polarization microstrip duplexed antenna according to claim 1 or 3, it is characterised in that the transmission micro-strip band resistance filter
Ripple device includes two sections of first end open circuit microstrip lines and one section of first connection microstrip line, and the two ends of the connection microstrip line connect respectively
Two sections of first end open circuit microstrip lines, the length and width of the first end open circuit microstrip line causes frequency to be fHairHair
The number of delivering letters can by and frequency be fReceiveReception signal can not pass through, it is described first connection microstrip line length and width make
It is f to obtain frequencyHairTransmission signal can by and frequency be fReceiveReception signal can not pass through.
5. the circularly polarization microstrip duplexed antenna according to claim 1 or 3, it is characterised in that the reception micro-strip band resistance filter
Ripple device is made up of two sections of second ends open circuit microstrip lines and one section of second connection microstrip line, the two ends of the second connection microstrip line
Two sections of second end open circuit microstrip lines are connect respectively, and the length and width of the second end open circuit microstrip line make it that frequency is
fReceiveReception signal can by and frequency be fHairTransmission signal can not pass through, it is described second connection microstrip line length and
Width causes frequency to be fReceiveReception signal can by and frequency be fHairTransmission signal can not pass through.
6. circularly polarization microstrip duplexed antenna according to claim 1, it is characterised in that the transmission microstrip bandstop filter
Working passband with the reception microstrip bandstop filter is on the contrary, and the transmission microstrip bandstop filter and the reception micro-strip
The stop-band frequency of bandstop filter is opposite.
7. circularly polarization microstrip duplexed antenna according to claim 6, it is characterised in that the transmission impedance converts microstrip line
Length and width meet claimed below：It is f to meet in frequencyReceiveReception signal conditioning under, connect matched load in sending port
When, send impedance conversion microstrip line and the close open circuit of impedance of the connection end of power distribution microstrip line.
8. circularly polarization microstrip duplexed antenna according to claim 6, it is characterised in that the reception impedance converts microstrip line
Length and width meet claimed below：It is f to meet in frequencyHairTransmission signal conditioning under, connect matched load in receiving port
When, receive impedance conversion microstrip line and the close open circuit of impedance of the connection end of power distribution microstrip line.
9. circularly polarization microstrip duplexed antenna according to claim 1, it is characterised in that the transmission impedance converts microstrip line
Different frequency is worked in impedance conversion microstrip line is received；The transmission impedance conversion microstrip line is 35.4 Ω impedance transformation lines,
Its length is λG is received/4；The reception impedance conversion microstrip line is also 35.4 Ω impedance transformation lines, and its length is λG is sent out/4；Wherein,
λG is sent outTo send wavelength of the signal on the power distribution microstrip line, λG is receivedTo receive signal on the power distribution microstrip line
Wavelength.
10. circularly polarization microstrip duplexed antenna according to claim 1, it is characterised in that be also placed in parallel including two
Upper layer medium substrate and layer dielectric substrate, reflection floor of the upper surface covered with metal of the layer dielectric substrate, bottom surface
Duplexing power distributing network is set；The micro-strip paster antenna is printed on the upper layer medium substrate upper surface；The probe
Lower surface of the horizontal microband printing in the upper layer medium substrate.
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| CN201710293074.2A CN107171078B (en) | 2017-04-28 | 2017-04-28 | Circularly polarized microstrip duplex antenna |
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| CN110233342A (en) * | 2019-06-24 | 2019-09-13 | 西安空间无线电技术研究所 | A kind of complex impedance matching circular polarisation filter antenna |
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| CN114709576A (en) * | 2022-04-21 | 2022-07-05 | 交通运输部公路科学研究所 | Microstrip duplexer applied to Beidou short message communication and design method |
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