CN104247148A - Differential feeding network - Google Patents
Differential feeding network Download PDFInfo
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- CN104247148A CN104247148A CN201380000399.7A CN201380000399A CN104247148A CN 104247148 A CN104247148 A CN 104247148A CN 201380000399 A CN201380000399 A CN 201380000399A CN 104247148 A CN104247148 A CN 104247148A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/19—Conjugate devices, i.e. devices having at least one port decoupled from one other port of the junction type
- H01P5/22—Hybrid ring junctions
- H01P5/227—90° branch line couplers
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Abstract
Disclosed is a differential feeding network. The differential feeding network comprises: four ports; main transmission lines respectively connected to the four ports; three branch transmission lines bridging the main transmission lines; and secondary transmission lines used for connection between the branch transmission lines and connection between the main transmission lines and the branch transmission lines, wherein the main transmission lines comprise first main transmission lines, which are respectively connected to two input/output ports in the four ports and have a 90 DEG phase shift function for a transmitted signal. After the differential feeding network is electrically connected to an antenna radiation unit, the main transmission lines, the three branch transmission lines, the secondary transmission lines, and the antenna radiation unit form an equivalent balun, so as to perform differential feeding on the antenna radiation unit through the two input/output ports. The differential feeding network according to the embodiment of the present invention enables phase inversion of a transmitted signal without using an impedance device, thereby reducing energy loss.
Description
Differential feed network technique field
The present invention relates to a kind of differential feed network in the communications field, more particularly to the communications field.Background technology
In mobile communication system, antenna for base station technology developing rapidly and applying, and has effectively promoted antenna for base station to miniaturization, integrated and multi-functional（That is multiband, multipolarization and multipurpose）Direction develop.The feeding network of antenna is one of important component in base station antenna system, and its high-performance, miniaturization are to restrict one of key factor that base station antenna system is further minimized.Thus, designing high-performance, the antenna for base station feeding network minimized, oneself turns into the research emphasis of antenna for base station technology.
As a kind of new feeding classification, differential feed can effectively improve the cross polarization discrimination of antenna, and the impedance bandwidth of broadening antenna.The key factor of differential feed is the bandwidth of its S parameter, i.e., whether the transmission signal inversion of difference port can be kept in wider frequency band.
The characteristics of City University of Hong Kong is directed to a kind of differential feed network of slotted patch Antenna Design, the differential feed network is to realize nonlinear phase shift by two fan-shaped minor matters, and utilizes the isolation of resistor increase port.In the range of 4GHz to 6.5GHz, the reflectance factor in the differential feed network is less than -10dB, and the phase difference of difference port is 180 ° ± 2.5 °.But the differential feed network can increase Insertion Loss due to having used resistance device, and the size of the differential feed network is larger.
The Hong Kong Polytechnic University devises a kind of differential feed network of micro-band branch, and the differential feed network is by introducing two 127 ohm and 161 ohm of minor matters and impedance device, it is possible to achieve the differential feed effect in broadband.But the program is also due to used impedance device, thus can introduce extra loss, it is unfavorable for the lifting of differential feed network performance.The content of the invention
The invention provides a kind of differential feed network, the transmission signal inversion of difference port while without using impedance device, can be realized, so as to reduce energy loss, and the performance of differential feed network is improved.
First aspect includes there is provided a kind of differential feed network, the differential feed network：Four ports；Main transmission line, the main transmission line is connected with four ports respectively；Three multi-branch transport lines, the multi-branch transport line is connected across between the main transmission line；Secondary transmission line, the secondary transmission line is used between the multi-branch transport line
Connection, and for the connection between the main transmission line and the multi-branch transport line；Wherein, the main transmission line includes the first main transmission line, and first main transmission line is connected with two input/output ports in four ports respectively, and first main transmission line has 90 degree of phase shift functions for transmission signal；After the differential feed network and antenna radiation unit electrical connection, the main transmission line, three multi-branch transport lines, the secondary transmission line and the antenna radiation unit constitute equivalent balun, to carry out differential feed to the antenna radiation unit by two input/output ports.
With reference in a first aspect, in the first possible implementation of first aspect, four ports include：First port, second port, the 3rd port and the 4th port, wherein, the first port is the input/output port for being connected with driving source, the second port and the 3rd port are the input/output port for being connected with the antenna radiation unit, and the 4th port absorbs port for loading；Wherein, first main transmission line is connected with the second port and the 3rd port respectively；The main transmission line also includes the second main transmission line, and second main transmission line is connected with the first port and the 4th port respectively.
With reference to the first possible implementation of first aspect, in second of possible implementation of first aspect, three multi-branch transport lines include：The first multi-branch transport line being connected with second main transmission line, the second multi-branch transport line being connected with the secondary transmission line and the 3rd multi-branch transport line being connected with first main transmission line；Wherein, the first multi-branch transport line, the second multi-branch transport line are equal with the electrical length of the 3rd multi-branch transport line, and a quarter of the wavelength for the transmission signal.
With reference to second of possible implementation of first aspect, in the third possible implementation of first aspect, the impedance of the first multi-branch transport line is more than or equal to the impedance of the second multi-branch transport line；And the impedance of the first multi-branch transport line is more than or equal to the impedance of the 3rd multi-branch transport line.
With reference to the third possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, the impedance of the second multi-branch transport line is equal to the impedance of the 3rd multi-branch transport line.
With reference to second of first aspect or the 4th kind of possible implementation, in the 5th kind of possible implementation of first aspect, the secondary transmission line includes：The first secondary transmission line and the 3rd secondary transmission line for connecting second main transmission line, the first multi-branch transport line and the second multi-branch transport line；The second secondary transmission line and fourth officer transmission line for connecting first main transmission line, the 3rd multi-branch transport line and the second multi-branch transport line；Wherein, the first secondary transmission line, the second secondary transmission line, the 3rd secondary transmission line are equal with the electrical length of the fourth officer transmission line, and a quarter of the wavelength for the transmission signal.
With reference to first aspect the first to any of the 5th kind of possible implementation possible implementation, in the 6th kind of possible implementation of first aspect, the impedance of first main transmission line is more than the impedance of second main transmission line；And the impedance of first main transmission line is less than three multi-branch transports
The impedance for each multi-branch transport line that line includes.
With reference to first aspect the first to any of the 6th kind of possible implementation possible implementation, in the 7th kind of possible implementation of first aspect, first main transmission line includes：The first main transmission line unit being connected with the second port, and the second main transmission line unit being connected with the 3rd port；Wherein, the electrical length of the first main transmission line unit is shorter than the electrical length of the second main transmission line unit, and the difference of the electrical length of the first main transmission line unit and the electrical length of the second main transmission line unit is a quarter of the wavelength of the transmission signal.
With reference to first aspect the first to any of the 7th kind of possible implementation possible implementation, in the 8th kind of possible implementation of first aspect, the frequency of the transmission signal is in the range of 1.71GHz to 2.17GHz.
With reference to first aspect the first to any of the 8th kind of possible implementation possible implementation, in the 9th kind of possible implementation of first aspect, the main transmission line, the multi-branch transport line and the secondary transmission line are made up of microstrip line.
With reference to first aspect the first to any of the 9th kind of possible implementation possible implementation, in the tenth kind of possible implementation of first aspect, the first port, the second port, the 3rd port and the input impedance of the 4th port are all 50 ohm.
With reference to the tenth kind of possible implementation of first aspect, in a kind of the tenth possible implementation of first aspect, first main transmission line is additionally operable to carry out the second port and the 3rd port 50 ohm of impedance matching.
Based on above-mentioned technical proposal, the differential feed network of the embodiment of the present invention, after being electrically connected with antenna radiation unit, main transmission line, three multi-branch transport lines and the secondary transmission line and the antenna radiation unit that the differential feed network includes constitute equivalent balun, so as to carry out differential feed to the antenna radiation unit by two input/output ports of the differential feed network, thus, it is possible to avoid using impedance device, reduce energy loss, and improve the performance of differential feed network.Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, cylinder will be made to the required accompanying drawing used in the embodiment of the present invention below singly to introduce, apparently, drawings described below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the principle schematic diagram of the differential feed network of the embodiment of the present invention.
Fig. 2 is the schematic block diagram of dual-port antenna radiation unit.
Fig. 3 is another principle schematic diagram of the differential feed network of the embodiment of the present invention.
Fig. 4 is the organigram of the differential feed network of the embodiment of the present invention.
Fig. 5 is the reflection coefficient chart of the differential feed network of the embodiment of the present invention.
Fig. 6 is the differential signal phase dygoram of the differential feed network of the embodiment of the present invention.Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made should all belong to the scope of protection of the invention.
It should be understood that the technical scheme of the embodiment of the present invention can apply to various communication systems, such as：Global system for mobile telecommunications（Global System of Mobile communication, cylinder is referred to as " GSM ") system, CDMA（Code Division Multiple Access, cylinder is referred to as " CDMA ") system, WCDMA（Wideband Code Division Multiple Access, cylinder is referred to as " WCDMA ") system, GPRS（General Packet Radio Service, cylinder is referred to as " GPRS "), Long Term Evolution（Long Term Evolution, cylinder is referred to as " LTE ") system, LTE FDDs（Frequency Division Duplex, cylinder is referred to as " FDD ") system, LTE time division duplexs（Time Division Duplex, cylinder is referred to as " TDD "), UMTS (Universal Mobile Telecommunication System, cylinder is referred to as " UMTS ") or global interconnection inserting of microwave（Worldwide Interoperability for Microwave Access, cylinder is referred to as " WiMAX ") communication system etc..
Fig. 1 shows the principle schematic diagram of the differential feed network 100 of the embodiment of the present invention.As shown in Fig. 1, the differential feed network 100 includes：Four ports Al, A2, A3, A4;Main transmission line 11,12,21,22, the main transmission line 11,12,21,22 is connected with four ports Al, A2, A3, the A4 respectively；Three multi-branch transport lines 31,32,33, the multi-branch transport line 31,32,33 is connected across between the main transmission line 11,12,21,22；Secondary transmission line 41,42,43,44, the connection that the secondary transmission line 41,42,43,44 is used between the multi-branch transport line 31,32,33, and for the connection between the main transmission line 11,12,21,22 and the multi-branch transport line 31,32,33；
Wherein, the main transmission line 11,12,21,22 includes the first main transmission line 11,12, first main transmission line 11,12 is connected with two input/output ports A2, A3 in four ports respectively, and first main transmission line 11,12 has 90 degree of phase shift functions for transmission signal；In the differential feed net
After network 100 is electrically connected with antenna radiation unit, the main transmission line 11,12,21,22, three multi-branch transport lines 31,32,33, the secondary transmission line 41,42,43,44 and the antenna radiation unit constitute equivalent balun, to carry out differential feed to the antenna radiation unit by two input/output ports A2, the A3.
Therefore, the differential feed network of the embodiment of the present invention, after being electrically connected with antenna radiation unit, main transmission line, three multi-branch transport lines and the secondary transmission line and the antenna radiation unit that the differential feed network includes constitute equivalent balun, so as to carry out differential feed to the antenna radiation unit by two input/output ports of the differential feed network, thus, it is possible to avoid using impedance device, reduce energy loss, and improve the performance of differential feed network.
On the other hand, differential feed network according to embodiments of the present invention, the transmission signal inversion by difference port can not only be kept in wider bandwidth range, the transmission signal constant amplitude by difference port can also be kept in wider bandwidth range, and with reflectance factor is low, size is small and low advantage is lost.
Specifically, for example, as shown in Fig. 1, the differential feed network 100 includes：Four port Al, A2, A3, A4, main transmission line 11,12,21,22, three multi-branch transport lines 31,32,33 and secondary transmission line 41,42,43,44.
Wherein, four ports include：First port Al, second port A2, the 3rd port A3 and the 4th port A4;First port A1 is the input/output port for being connected with driving source；Second port A2 and the 3rd port A3 is the input/output port for being connected with antenna radiation unit；4th port A4 absorbs port for loading.That is first port Al, second port A2 and the 3rd port A3 are input/output port, and the 4th port A4 absorbs port for loading, for matched load, it is impossible to for inputting or output signal.
It should be understood that in embodiments of the present invention, term " input/output port ", which refers to the port, can either be used for input signal, also can be used in output signal, but the embodiment of the present invention is not limited to this.
In embodiments of the present invention, the matches impedances that the input impedance of four ports of differential feed network can be with external devices, matches impedances that for example can be with driving source, matches impedances that also can be with antenna radiation unit.Alternatively, first port Al, second port A2, the 3rd port A3 and the 4th port A4 input impedance are all 50 ohm.
It should be understood that the embodiment of the present invention is only illustrated so that the input impedance of four ports is all 50 ohm as an example, but the present invention is not limited thereto, and the input impedance of four ports can also be other values, with the matches impedances with the external devices being connected.
In embodiments of the present invention, main transmission line 11, 12, 21, 22 can include the first main transmission line 11, 12, first main transmission line 11, 12 are connected with the second port A2 and the 3rd port A3 in four ports respectively, and first main transmission line 11, 12 have 90 degree of phase shift functions for transmission signal, so that after the differential feed network 100 is electrically connected with antenna radiation unit, the differential feed network 100 and the antenna radiation unit constitute equivalent balun, to carry out differential feed to the antenna radiation unit by the second port A2 and the 3rd port A3 of the differential feed network 100, wherein, second port A2 and the 3rd port A3 are referred to as difference port.In embodiments of the present invention, the main transmission line can also include the second main transmission line 21,22, and second main transmission line 21,22 is connected with first port A1 and the 4th port A4 respectively.
Further, first main transmission line 11,12 can include the first main transmission line unit 11 and the second main transmission line unit 12, wherein, the first main transmission line unit 11 can be connected with second port A2, and be connected with multi-branch transport line 33 and secondary transmission line 44, the second main transmission line unit 12 can be connected with the 3rd port A3, and be connected with multi-branch transport line 33 and secondary transmission line 42；Similarly, second main transmission line 21,22 can include the 3rd main transmission line unit 21 and the 4th main transmission line unit 22, wherein, 3rd main transmission line unit 21 can be connected with first port A1, and be connected with multi-branch transport line 31 and secondary transmission line 43, the 3rd main transmission line unit 21 is transmission path；4th main transmission line unit 22 can be connected with the 4th port A4, and be connected with multi-branch transport line 31 and secondary transmission line 41, and the 4th main transmission line unit 22 absorbs path for matching.
In embodiments of the present invention, alternatively, first main transmission line is additionally operable to carry out impedance matching to second port A2 and the 3rd port A3, for example, carrying out 50 ohm of impedance matching.It should be understood that, in embodiments of the present invention, with the difference of the load with differential feed network connection, second main transmission line is possibly used for carrying out impedance matching to first port A1 and the 4th port A4, such as impedance matching of 50 ohm of progress, but the embodiment of the present invention is not limited to this.
In embodiments of the present invention, three multi-branch transport lines 31,32,33 can include：First multi-branch transport line 31, the first multi-branch transport line 31 is connected with the second main transmission line 21,22；Second multi-branch transport line 32, the second multi-branch transport line 32 is connected with secondary transmission line 41,42,43,44；And the 3rd multi-branch transport line 33, the 3rd multi-branch transport line 33 is connected with the first main transmission line 11,12.
In embodiments of the present invention, the secondary transmission line 41,42,43,44 can include：For connecting second main transmission line 21,22, the first secondary secondary transmission line 43 of transmission line 41 and the 3rd of the first multi-branch transport line 31 and the second multi-branch transport line 32;The second secondary transmission line 42 and fourth officer transmission line 44 for connecting first main transmission line, the 3rd multi-branch transport line and the second multi-branch transport line.
Specifically, for example as shown in figure 1, the first secondary transmission line 41 can be connected with the 4th main transmission line unit 22, the first multi-branch transport line 31, the second multi-branch transport line 32 and the second secondary transmission line 42；Second secondary transmission line 42 can be connected with the second main transmission line unit 12, the second multi-branch transport line 32, the 3rd multi-branch transport line 33 and the first secondary transmission line 41；3rd secondary transmission line 43 can be connected with the 3rd main transmission line unit 21, the first multi-branch transport line 31, the second multi-branch transport line 32 and fourth officer transmission line 44；Fourth officer transmission line 44 can be connected with the first main transmission line unit 11, the second multi-branch transport line 32, the 3rd multi-branch transport line 33 and the 3rd secondary transmission line 43.
It should be understood that the embodiment of the present invention is only illustrated by taking the above-mentioned connection of main transmission line, multi-branch transport line and secondary transmission line as an example, but the embodiment of the present invention is not limited to this, and differential feed network according to embodiments of the present invention can also have other annexations；And it shall yet further be noted that the use of the term such as " first " and " second " involved in the embodiment of the present invention is merely for convenience of description, the scope to the embodiment of the present invention is not construed as limiting, and because these terms are symmetrical, thus can be exchanged.
In embodiments of the present invention, the first main transmission line that main transmission line includes can be used for producing transmission signal 90 degree of phase shifts, and for carrying out impedance matching to difference port, for example, carry out 50 ohm of impedance matching.Specifically, alternatively, in embodiments of the present invention, the electrical length of the first main transmission line unit 11 is shorter than the electrical length of the second main transmission line unit 12, and the difference of the electrical length of the first main transmission line unit 11 and the electrical length of the second main transmission line unit 12 is a quarter of the wavelength of the transmission signal.So that the transmission signal exported by the second main transmission line unit 12 is than 90 degree of phases of transmission signal delay for being exported by the first main transmission line unit 11.
It should be understood that, the difference of the electrical length of the first main transmission line unit 11 and the electrical length of the second main transmission line unit 12 can be approximated to be a quarter of the wavelength of the transmission signal, for example, the difference is 0.22 λ, 0.24 λ, 0.26 λ or 0.28 λ etc., wherein λ is the wavelength of transmission signal, for example, the frequency of the transmission signal is in the range of 1.71GHz to 2.17GHz.
Three multi-branch transport lines and secondary transmission line can be used for producing coupling branch transmission paths, so as to the amplitude and phase of controlling transmission signal, specifically, pass through the Signal averaging of a plurality of coupling individual path, so that first port A1 isolates with the 4th port A4, and to produce 90 degree of phase difference again by the transmission signal of difference port, i.e. so that the transmission signal exported by the 3rd port A3 postpones 90 degree of phases again than the transmission signal exported by second port A2, so that carrying out differential feed to antenna radiation unit by the difference port A2 and A3.
In embodiments of the present invention, the electrical length of the first multi-branch transport line 31, the second multi-branch transport line 32 and the 3rd multi-branch transport line 33 can be approximately a quarter for the wavelength for transmitting signal, for example, respectively
The electrical length of multi-branch transport line is in 0.2 λ between 0.3 λ, and wherein λ is the wavelength of transmission signal；In another example, the electrical length of each multi-branch transport line is 0.22 λ, 0.24 λ, 0.26 λ or 0.28 λ etc..Alternatively, the first multi-branch transport line 31, the second multi-branch transport line 32 are equal with the electrical length of the 3rd multi-branch transport line 33, and a quarter of the wavelength for the transmission signal.
In embodiments of the present invention, alternatively, the first secondary transmission line 41, the second secondary secondary transmission line 43 of transmission line the 42, the 3rd are equal with the electrical length of the fourth officer transmission line 44, and a quarter of the wavelength for the transmission signal.It should be understood that the electrical length of each secondary transmission line also can be approximately a quarter for the wavelength for transmitting signal, for example, the electrical length of each secondary transmission line in 0.2 λ between 0.3 λ, wherein λ for transmission signal wavelength；In another example, the electrical length of each secondary transmission line is 0.22 λ, 0.24 λ, 0.26 λ or 0.28 λ etc., but the embodiment of the present invention is not limited to this.
In embodiments of the present invention, alternatively, the impedance of the first multi-branch transport line 31 is more than or equal to the impedance of the second multi-branch transport line 32；And the impedance of the first multi-branch transport line 31 is more than or equal to the impedance of the 3rd multi-branch transport line 33.The impedance of the second multi-branch transport line 32 is close with the impedance of the 3rd multi-branch transport line 33, it is preferable that the impedance of the second multi-branch transport line 32 is equal to the impedance of the 3rd multi-branch transport line 33.
In embodiments of the present invention, alternatively, the impedance of first main transmission line 11,12 is more than the impedance of second main transmission line 21,22；And the impedance of first main transmission line 11,12 is less than the impedance for each multi-branch transport line that three multi-branch transport lines include.
Specifically, the impedance of the first main transmission line unit 11 or the second main transmission line unit 12 that first main transmission line includes be both greater than any one main transmission line unit 21 that second main transmission line includes,
22 impedance；And the impedance of the first main transmission line unit 11 or the second main transmission line unit 12 is less than the impedance for each multi-branch transport line that three multi-branch transport lines include.
In embodiments of the present invention, alternatively, the frequency of the transmission signal is in the range of 1.71GHz to 2.17GHz.Alternatively, first port Al, second port A2, the 3rd port A3 and the 4th port A4 input impedance are all 50 ohm.Alternatively, first main transmission line is additionally operable to carry out second port A2 and the 3rd port A3 50 ohm of impedance matching.
In embodiments of the present invention, alternatively, the main transmission line, the multi-branch transport line and the secondary transmission line are made up of microstrip line.For example, differential feed network according to embodiments of the present invention includes dielectric-slab, the lower surface of the dielectric-slab is metal, and the upper surface of the dielectric-slab includes a plurality of microstrip line, and a plurality of microstrip line constitutes above-mentioned main transmission line, multi-branch transport line and secondary transmission line.So as to significantly reduce the size of differential feed network, and avoid using impedance device, to reduce loss.
Therefore, the differential feed network of the embodiment of the present invention, after being electrically connected with antenna radiation unit, main transmission line, three multi-branch transport lines and the secondary transmission line and the antenna radiation unit that the differential feed network includes constitute equivalent balun, so as to carry out differential feed to the antenna radiation unit by two input/output ports of the differential feed network, thus, it is possible to avoid using impedance device, reduce energy loss, and improve the performance of differential feed network.
Fig. 2 shows the schematic block diagram of dual-port antenna radiation unit 10, Fig. 3 show the differential feed network 100 of the embodiment of the present invention be connected with the dual-port antenna radiation unit 10 shown in Fig. 2 after principle schematic diagram.Below in conjunction with Fig. 2 and Fig. 3, the differential feed network of the embodiment of the present invention is described.
As shown in Fig. 2 two feed ports of the B2 and B3 for the antenna radiation unit 10 of dual-port,
C1 is electromagnetic radiation unit, and D1 is connection B3 and C1 transmission line, and D2 is connects B2 and C1 transmission line, and HI and H2 are respectively then D1 and D2 and C1 connectivity port.
Fig. 3 shows that the connection between the differential feed network 100 of the embodiment of the present invention and antenna radiation unit 10, i.e. port A2 and A3 are electrically connected with port B2 and B3 respectively.Because having electromagnetism between D1 and D2 mutually to scatter, so that producing coupled transfer path between D1 and D2, cause to produce virtual electromagnetic equivalent branch line 34 between differential feed network and antenna radiation unit, and the equivalent secondary transmission line 45,46 of virtual electromagnetic of the virtual electromagnetic equivalent branch line 34 connection, the physical meaning of these equivalent lines is mutual scattering parameter and Dl, D2 and a main transmission line 11,12-equivalent result between radiating element HI and H2.The virtual electromagnetic equivalent branch line 34, the equivalent secondary transmission line 45,46 of virtual electromagnetic, with the multi-branch transport line unit 31,32,33 of differential feed network, the second main transmission line unit 21,22, secondary transmission line unit 41,42,43,44 cooperatively forms equivalent balun El.The equivalent balun El is used for the anti-phase active antenna of difference.
It is according to embodiments of the present invention to be used for the process that antenna port differential feed encourages and be：Pumping signal S (Signal) enters differential feed network from first port A1, power distribution and the phase shift of main transmission line and multi-branch transport line that pumping signal S passes through differential feed network, in second port A2 and the 3rd port A3 difference output signal S2 and S3, wherein signal S2 and S3 constant amplitudes are anti-phase.Signal S2 and S3 transfers signals to the port pair of radiating element by the transmission line group of antenna, so as to realize the differential feed to antenna.
Fig. 4 shows a kind of specific configuration of the differential feed network of the embodiment of the present invention.As shown in figure 4, differential feed network 100 includes：Dielectric-slab 5;The lower surface of dielectric-slab 5 is metal（Not shown in figure）；There is a plurality of microstrip line the upper surface of dielectric-slab 5, these microstrip lines composition differential feed network, its
In the differential feed network transmission signal frequency in the range of 1.71GHz to 2.17GHz.
In the differential feed network 100 shown in Fig. 4,3 multi-branch transport lines 31,32,33 are connected across between main transmission line 11,12,21,22 and secondary transmission line 41,42,43,44, constitute preceding 3 multi-branch transport lines of equivalent balun.Main transmission line includes the first main transmission line 11 and 12 near port A2 and A3, and after the differential feed network and the electrical connection of dual-port antenna radiation unit, first main transmission line 11,12 constitutes the 4th equivalent branch transmission line of equivalent balun.Wherein, port A1 is connected with driving source, and port A2 and A3 are connected with two port electricals of antenna respectively.Signal S1 from port A1 inputs is after differential feed network, opposite to antenna radiation unit output phase and constant amplitude two paths of differential signals S12 and S13, so as to realize the differential feed to antenna.
In the differential feed network shown in Fig. 4, for example, the first main transmission line 11 and 12 length are respectively 61mm and 96mm;The length of multi-branch transport line 31,32 and 33 is respectively 30mm, 26mm and 28mm;The length of four secondary transmission lines is 20mm;The dielectric constant of differential feed network used medium plate is 2.6.It is limited to this, in specific implementation, transmission line group structure, impedance and its length of differential feed network according to embodiments of the present invention can be optimized according to demand.
Therefore, the differential feed network of the embodiment of the present invention, after being electrically connected with antenna radiation unit, main transmission line, three multi-branch transport lines and the secondary transmission line and the antenna radiation unit that the differential feed network includes constitute equivalent balun, so as to carry out differential feed to the antenna radiation unit by two input/output ports of the differential feed network, thus, it is possible to avoid using impedance device, reduce energy loss, and improve the performance of differential feed network.
In order to further illustrate the performance of differential feed network according to embodiments of the present invention, the result obtained as illustrated in Figures 5 and 6 is estimated after differential feed network and electromagnetic dipole antenna are cascaded.
Specifically, as shown in Fig. 5, differential feed network according to embodiments of the present invention has excellent impedance matching property in 1.6 ~ 2.4GHz frequency range, and the wherein reflectance factor of A1 ports is less than -14dB.As shown in fig. 6, in 1.65 ~ 2.17GHz frequency ranges, the differential signal phase difference that the difference port A2 and A3 of differential feed network according to embodiments of the present invention are exported is maintained in the range of 180 ° ± 10 °.
Complex chart 5 and the result shown in Fig. 6, in 1.71 ~ 2.17GHz target band, the reflectance factor that differential feedback network according to embodiments of the present invention has is less than -14dB, and phase error is relatively low, within 10 degree, with excellent differential feed performance.
Therefore, the differential feed network of the embodiment of the present invention, after being electrically connected with antenna radiation unit, main transmission line, three multi-branch transport lines and the secondary transmission line and the antenna radiation unit that the differential feed network includes constitute equivalent balun, so as to carry out differential feed to the antenna radiation unit by two input/output ports of the differential feed network, thus, it is possible to avoid using impedance device, reduce energy loss, and improve the performance of differential feed network.
In addition, the terms " system " and " network " are often used interchangeably herein.The terms " and/or,, only it is a kind of describe affiliated partner incidence relation, expression there may be three kinds of relations, for example, A and/or B, can be represented：Individualism A, while there is A and B, these three situations of individualism B.In addition, character herein " ,-as represent forward-backward correlation object be it is a kind of " or " relation.
In several embodiments provided herein, it should be understood that disclosed system and device, it can realize by another way.For example, device embodiment described above is only schematical, for example, the division of the unit, it is only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can combine or be desirably integrated into another system, or some features can be ignored, or do not perform.In addition, shown or discussed coupling or direct-coupling or communication connection each other can be by the INDIRECT COUPLING of some interfaces, device or unit or communication connection or electricity, mechanical or other forms are connected.It can be for the part that unit is shown or may not be physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Some or all of unit therein can be selected to realize the purpose of scheme of the embodiment of the present invention according to the actual needs.
It is described above; only embodiment of the invention; but protection scope of the present invention is not limited thereto; any one skilled in the art the invention discloses technical scope in; various equivalent modifications or substitutions can be readily occurred in, these modifications or substitutions should be all included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (1)
- Claim1st, a kind of differential feed network, it is characterised in that including：Four ports；Main transmission line, the main transmission line is connected with four ports respectively；Three multi-branch transport lines, the multi-branch transport line is connected across between the main transmission line；Secondary transmission line, the connection that the secondary transmission line is used between the multi-branch transport line, and for the connection between the main transmission line and the multi-branch transport line；Wherein, the main transmission line includes the first main transmission line, and first main transmission line is connected with two input/output ports in four ports respectively, and first main transmission line has 90 degree of phase shift functions for transmission signal；After the differential feed network and antenna radiation unit electrical connection, the main transmission line, three multi-branch transport lines, the secondary transmission line and the antenna radiation unit constitute equivalent balun, to carry out differential feed to the antenna radiation unit by described two input/output ports.2nd, differential feed network according to claim 1, it is characterised in that four ports include：First port, second port, the 3rd port and the 4th port, wherein, the first port is the input/output port for being connected with driving source, the second port and the 3rd port are the input/output port for being connected with the antenna radiation unit, and the 4th port absorbs port for loading；Wherein, first main transmission line is connected with the second port and the 3rd port respectively；The main transmission line also includes the second main transmission line, and second main transmission line is connected with the first port and the 4th port respectively.3rd, differential feed network according to claim 2, it is characterised in that three multi-branch transport lines include：The first multi-branch transport line being connected with second main transmission line, the second multi-branch transport line being connected with the secondary transmission line and the 3rd multi-branch transport line being connected with first main transmission line；Wherein, the electrical length of the first multi-branch transport line, the second multi-branch transport line and the 3rd multi-branch transport line is equal, and a quarter of the wavelength for the transmission signal.4th, differential feed network according to claim 3, it is characterised in that the impedance of the first multi-branch transport line is more than or equal to the impedance of the second multi-branch transport line；And the impedance of the first multi-branch transport line is more than or equal to the impedance of the 3rd multi-branch transport line.5th, differential feed network according to claim 4, it is characterised in that the impedance of the second multi-branch transport line is equal to the impedance of the 3rd multi-branch transport line.6th, the differential feed network according to any one of claim 3 to 5, it is characterised in that the secondary transmission line includes： The first secondary transmission line and the 3rd secondary transmission line for connecting second main transmission line, the first multi-branch transport line and the second multi-branch transport line；The second secondary transmission line and fourth officer transmission line for connecting first main transmission line, the 3rd multi-branch transport line and the second multi-branch transport line；Wherein, the electrical length of the described first secondary transmission line, the described second secondary transmission line, the described 3rd secondary transmission line and the fourth officer transmission line is equal, and a quarter of the wavelength for the transmission signal.7th, the differential feed network according to any one of claim 2 to 6, it is characterised in that the impedance of first main transmission line is more than the impedance of second main transmission line；And the impedance of first main transmission line is less than the impedance for each multi-branch transport line that three multi-branch transport lines include.8th, the differential feed network according to any one of claim 2 to 7, it is characterised in that first main transmission line includes：The first main transmission line unit being connected with the second port, and the second main transmission line unit being connected with the 3rd port；Wherein, the electrical length of the first main transmission line unit is shorter than the electrical length of the second main transmission line unit, and the difference of the electrical length of the first main transmission line unit and the electrical length of the second main transmission line unit is a quarter of the wavelength of the transmission signal.9th, the differential feed network according to any one of claim 2 to 8, it is characterised in that the frequency of the transmission signal is in the range of 1.71GHz to 2.17GHz.10th, the differential feed network according to any one of claim 2 to 9, it is characterised in that the main transmission line, the multi-branch transport line and the secondary transmission line are made up of microstrip line.11st, the differential feed network according to any one of claim 2 to 10, it is characterised in that the first port, the second port, the 3rd port and the input impedance of the 4th port are all 50 ohm.12nd, the differential feed network according to claim 11, it is characterised in that first main transmission line is additionally operable to carry out the second port and the 3rd port 50 ohm of impedance matching.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2013/071478 WO2014121475A1 (en) | 2013-02-06 | 2013-02-06 | Differential feeding network |
Publications (2)
| Publication Number | Publication Date |
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| CN104247148A true CN104247148A (en) | 2014-12-24 |
| CN104247148B CN104247148B (en) | 2016-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201380000399.7A Active CN104247148B (en) | 2013-02-06 | 2013-02-06 | differential feed network |
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| CN (1) | CN104247148B (en) |
| WO (1) | WO2014121475A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5132645A (en) * | 1989-11-15 | 1992-07-21 | Bernd Mayer | Wide-band branch line coupler |
| CN1165588A (en) * | 1995-09-22 | 1997-11-19 | 夸尔柯姆股份有限公司 | Dual-band octafilar helix antenna |
| CN102570033A (en) * | 2011-11-16 | 2012-07-11 | 广州杰赛科技股份有限公司 | Electricity adjusting antenna feed module |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174729A (en) * | 2007-10-24 | 2008-05-07 | 华南理工大学 | Two-side symmetrical arc arm phase shifter of electricity-regulating antenna |
-
2013
- 2013-02-06 WO PCT/CN2013/071478 patent/WO2014121475A1/en active Application Filing
- 2013-02-06 CN CN201380000399.7A patent/CN104247148B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5132645A (en) * | 1989-11-15 | 1992-07-21 | Bernd Mayer | Wide-band branch line coupler |
| CN1165588A (en) * | 1995-09-22 | 1997-11-19 | 夸尔柯姆股份有限公司 | Dual-band octafilar helix antenna |
| CN102570033A (en) * | 2011-11-16 | 2012-07-11 | 广州杰赛科技股份有限公司 | Electricity adjusting antenna feed module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104247148B (en) | 2016-03-09 |
| WO2014121475A1 (en) | 2014-08-14 |
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