CN111446544A - Broadband circularly polarized high-efficiency rectifying antenna with wide power range - Google Patents

Broadband circularly polarized high-efficiency rectifying antenna with wide power range Download PDF

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CN111446544A
CN111446544A CN202010248844.3A CN202010248844A CN111446544A CN 111446544 A CN111446544 A CN 111446544A CN 202010248844 A CN202010248844 A CN 202010248844A CN 111446544 A CN111446544 A CN 111446544A
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line
rectifying
circularly polarized
microstrip
phase shifter
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章秀银
薄少飞
杜志侠
曹云飞
区俊辉
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South China University of Technology SCUT
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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
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • 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
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/24—Polarising devices; Polarisation filters 
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H02J50/27—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of receiving antennas, e.g. rectennas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
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Abstract

The invention discloses a broadband circularly polarized high-efficiency rectifying antenna with a wide power range, which comprises a dielectric substrate, wherein a receiving antenna and a rectifying circuit are printed on two sides of the dielectric substrate and are connected through a microstrip line, the receiving antenna is a broadband circularly polarized slot antenna, the broadband circularly polarized slot antenna comprises a square ring groove fed by a 90-degree broadband phase shifter based on a coupling line, the rectifying circuit comprises a first rectifying path and a second rectifying path, and the first rectifying path and the second rectifying path are connected in parallel and then are connected with a load in series and are grounded. The invention can be used for a wide-frequency-band microwave wireless energy transmission system, and has the advantages of compressing the change degree of the circuit impedance in a wide frequency and wide power range, improving the matching performance and keeping higher rectification efficiency.

Description

Broadband circularly polarized high-efficiency rectifying antenna with wide power range
Technical Field
The invention relates to the technical field of microwave wireless energy transmission, in particular to a broadband circularly polarized high-efficiency rectifying antenna with a wide power range.
Background
In a microwave Wireless energy transmission (WPT) system, a receiving-end rectifying antenna mainly consists of a receiving antenna and a rectifying circuit, wherein the most important index is radio frequency-to-direct current conversion efficiency, but the index is limited by various factors such as frequency, input power, a matching network, a circuit structure itself, and the like, because the adopted diode has a nonlinear characteristic, a common matching network design only aims at a specific optimal power point, and the rectifying efficiency is greatly reduced after an operating power point deviates, so that in order to widen the input power range of the rectifying circuit, the rectifying circuit has a higher rectifying efficiency in documents v.marian, c.voltage, j.vertical, and b.al 63, "characteristics of an adaptive rectifying circuit," IEEE antennas Wireless property. L et., "2012.10, pp.1393-1396,2011," v.marian, b.al, c.voltage, j.10, and "power amplifier, and" rectifier circuit has a higher rectifying efficiency in parallel connection, so that the rectifying circuit has a higher rectifying efficiency in a range of IEEE product, i.52.
In the documents s.h. abdelhalem, p.s.gudem, and L. e. L arson, "An RF-DC converter with side-dynamic-range input conversion for power recovery applications," IEEE "circuits" system ii, exp.briefs, vol.60, No.6, pp.336-340, jun 20152013, and in the documents z. L iu, z.zhong and y-x.guo, "Enhanced dual-basic RF energy conversion with side-power range", IEEE micro system company, L et, ph.25, ph.9, vol.630, pp.632, sep.632, GaAs, emt, and t, respectively, the power range is extended with the matching diodes.
In documents "x.y.zhang, z.x.du and q.xue" High-efficiency broadband recitification with wide ranges of input power and output load based on the bridge-coupler, "IEEE trains circuits and Systems I: Regular Papers, vol.64, No.3, pp.731-739, and mar.2017", a branch line coupler is used to re-return the energy reflected by the mismatch to the rectifier circuit, thereby improving the rectification efficiency at low input power. But both of the above methods introduce additional losses.
In documents y.han, o. L eitermann, d.a.jackson, j.m.rivas, and d.j.per ault, "Resistance compression networks for radio-frequency power conversion," ieee trans. power electronics ", vol.22, No.1, pp.41-53, jan.2007", an impedance compression network (RCN: Resistance compression network) was successfully applied to the rectifier circuit, which technique reduces the sensitivity of the diode impedance to changes in input power and thus improves the matching and extension power range.
In documents "z.x.du and x.y.zhang," High-efficiency single-and dual-band modulation using a complex impedance compression network for wireless power transfer, "IEEE trans.in.electron", vol.65, No.6, pp.5012-5022, jun.2018 ", a single-frequency and dual-frequency rectifier circuit based on complex impedance compression is proposed, but its operating bandwidth is narrow.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides a broadband circularly polarized high-efficiency rectifying antenna with a wide power range.
The invention is composed of a broadband circularly polarized slot antenna and a wide-bandwidth power range rectifying circuit. When the microwave input power and frequency received by the antenna change, the input impedance of the circuit changes greatly due to the nonlinear characteristic of the diode and the frequency dependence of the matching network, so that mismatch is caused, and the efficiency is reduced. But by adopting the broadband impedance compression, the change degree of the circuit impedance can be compressed in a wide frequency and wide power range, the matching performance is improved, and the higher rectification efficiency is kept.
The invention adopts the following technical scheme:
the utility model provides a broadband circular polarization high efficiency rectenna with wide power range, includes the dielectric substrate, at the both sides printing of dielectric substrate through microstrip line connection's receiving antenna and rectifier circuit, receiving antenna is broadband circular polarization slot antenna, broadband circular polarization slot antenna includes carries out the square ring groove of feed by 90 degrees broadband phase shifters based on coupling line, rectifier circuit includes first rectification route and second rectification route, and first rectification route is parallelly connected after with the second rectification route and is established ties with the load and ground.
Furthermore, the 90-degree broadband phase shifter based on the coupling line is located on the upper surface of the dielectric substrate, the square ring groove is located on the lower surface of the dielectric substrate, and the electrical length of the square ring groove is one wavelength of the central frequency of the working frequency band.
Furthermore, the 90-degree broadband phase shifter based on the coupling line comprises a wilkinson power divider, a first Y-shaped microstrip branch, a second Y-shaped microstrip branch, a phase shifter coupling line and a phase shifter microstrip line, wherein the first Y-shaped microstrip branch is connected with the phase shifter microstrip line, the second Y-shaped microstrip branch is connected with the phase shifter coupling line, and the wilkinson power divider combines output signals of the phase shifter microstrip line and the phase shifter coupling line into one path in equal power and inputs the path into a rear-stage rectification circuit.
Furthermore, the first rectifying path is composed of a first coupling line and a first rectifying branch, the second rectifying path is composed of a second coupling line and a second rectifying branch, the length of the first coupling line is greater than that of the second coupling line, and the sum of the electrical lengths of the equivalent microstrip lines of the first coupling line and the second coupling line is 180 degrees.
Further, the first rectifying branch and the second rectifying branch have the same structure and respectively comprise a T-shaped impedance matching network, a rectifying diode and a capacitor, wherein the T-shaped impedance matching network is connected with the rectifying diode in series, then connected with the capacitor in parallel, and then connected with the load in series and grounded, so that the conversion of radio frequency-direct current energy is realized.
Further, the T-type impedance matching network includes a section of series high-impedance microstrip line, a section of parallel low-impedance ground line, and a section of series microstrip line.
Furthermore, the microstrip line is formed by connecting a section of microstrip line with gradually changed width and a section of microstrip line with fixed width, and the microstrip line is arranged on the upper surface of the dielectric substrate.
And the two gaps are positioned on the lower surface of the medium substrate and are respectively perpendicular to two sides of the microstrip line with the fixed width.
Further, the electrical length of the phase shifter microstrip line is 90 degrees of the center frequency.
Further, the first coupling line and the second coupling line satisfy the following condition:
Figure BDA0002434784200000031
Figure BDA0002434784200000032
Figure BDA0002434784200000033
Figure BDA0002434784200000034
wherein f is1And f2Respectively a low frequency point and a high frequency point, Z, in the operating frequency bandceAnd ZcoOdd and even mode impedances, Z, of the first and second coupled lines, respectivelyTIs the characteristic impedance of the microstrip line after the two coupled lines are equivalent to the microstrip line, thetaT1Is the first coupled line at the low frequency point f1Electrical length of time-equivalent microstrip line, thetaC1And thetaC2Are respectively provided withIs that the first coupled line and the second coupled line are at the low frequency point f1Electrical length of time.
The invention has the beneficial effects that:
(1) the receiving antenna and the rectifying circuit are connected through the microstrip line, so that the receiving antenna and the rectifying circuit are integrated on the same dielectric substrate, and the structure is compact;
(2) the receiving antenna is loaded with the 90-degree broadband phase shifter based on the coupling line to carry out gap coupling excitation on the square ring groove of the antenna radiator, so that the two-way broadband circular polarization radiation is realized, and the receiving rectification efficiency is improved;
(3) the broadband impedance compression network of the rectifying circuit can simultaneously reduce the input impedance of the circuit in a broadband and wide power range, thereby improving the matching performance and the rectifying efficiency of the circuit and enabling the rectifying circuit to realize high efficiency in a broadband and wide input power range.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a broadband impedance compression network of the present invention;
FIG. 3 is a diagram showing the simulation result of the input reflection coefficient of the rectifying circuit under the condition that the input power is the optimal input power of 14dBm according to the embodiment of the present invention;
fig. 4 is a comparison graph of the rectification efficiency of the conventional broadband rectifying antenna without using the broadband impedance compression network under different power densities.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Examples
A broadband circularly polarized high-efficiency rectifying antenna with a wide power range comprises a dielectric substrate 1, and a receiving antenna and a rectifying circuit are printed on two sides of the dielectric substrate, wherein in the embodiment, as shown in figure 1, the left side is provided with the receiving antenna, the right side is provided with the rectifying circuit, and the receiving antenna is connected with the rectifying circuit through a microstrip line 11.
The receiving antenna is a broadband circularly polarized slot antenna and specifically comprises a 90-degree broadband phase shifter arranged on the upper surface of the dielectric substrate and based on a coupling line and a square ring groove 2 arranged on the lower surface of the dielectric substrate, wherein the outer diameter of the square ring groove is 39mm, and the inner diameter of the square ring groove is 29 mm. The 90-degree broadband phase shifter based on the coupling line feeds power to the square ring groove, so that radiation is performed. The electrical length of the square ring groove is one wavelength of the central frequency of the working frequency band.
The 90-degree broadband phase shifter based on the coupling line comprises a Wilkinson power divider 8, a first Y-shaped microstrip branch 3, a second Y-shaped microstrip branch 4, a phase shifter coupling line 6 and a phase shifter microstrip line 7, wherein the first Y-shaped microstrip branch and the second Y-shaped microstrip branch are identical in structural size, and the square ring groove is excited to perform electromagnetic radiation in a coupling feed mode.
The width of the slot of the phase shifter coupling line is 0.2mm, so that the bandwidth of the receiving antenna can be expanded; the electric length of the phase shifter microstrip line is 90 degrees of the central frequency of the working frequency band, the phase shifter microstrip line can play a role in shifting the phase, specifically, a phase difference of 90 degrees is formed at the first Y-shaped branch 3 and the second Y-shaped branch 4, and the square ring groove 2 is excited to realize circular polarization radiation. In this embodiment, two branches of the first Y-branch and the second Y-branch that are in a right angle relationship are located outside two right angles of the inner ring square of the square ring groove, and the first Y-branch and the second Y-branch are respectively connected to the phase-shift coupling line 6 and the phase-shift microstrip line 7.
The Wilkinson power divider performs equal-power synthesis on a phase-shift coupling line 6 and a phase-shift microstrip line 7 to form a path, and inputs the path into a rear-stage rectification circuit, wherein the isolation resistor 5 of the Wilkinson power divider is 100 omega.
The microstrip line used for connecting the rectifying circuit and the receiving antenna in the embodiment is formed by connecting a section of microstrip line with gradually changed width and a section of microstrip line with fixed width, and the impedance matching degree is increased. The microstrip line with gradually changed width is connected with the Wilkinson power divider, and the microstrip line with fixed width is connected with the rectifying circuit.
The lower surface of the dielectric substrate is also provided with a first long strip gap 9 and a second long strip gap 10, the two gaps are identical in structural size, are loaded on two sides of the corresponding lower surface of the microstrip line and are perpendicular to the microstrip line, the floor of the receiving antenna is isolated from the floor of the rectifying circuit, and the influence of the floor of the rectifying circuit on an antenna radiation directional diagram is reduced.
The rectifier circuit is a wide-bandwidth power range rectifier circuit, specifically adopts a wide-bandwidth impedance compression network to reduce the input impedance range of a rectifier diode, and comprises a first rectifier path and a second rectifier path, wherein the first rectifier path and the second rectifier path are connected in parallel and then are connected in series with a load 20 and are grounded.
The first rectifying path comprises a first coupling line 12 and a first rectifying branch, and the first rectifying branch comprises a first T-shaped impedance matching network 14, a first rectifying diode 16 and a first capacitor 19;
the second rectifying path is composed of a second coupling line 13 and a second rectifying branch, and the second rectifying branch includes a second T-type impedance matching network 15, a second rectifying diode 17 and a second capacitor 18.
The two rectifying branches have the same structure, and are respectively connected in series with a rectifying diode, then connected in parallel with a capacitor, and then connected in series with a load to be grounded, so that the conversion of radio frequency-direct current energy is realized.
The branches of the parallel microstrip lines in the first T-shaped impedance matching network 14 and the second T-shaped impedance matching network 15 are connected with the metal on the lower layer of the dielectric substrate through the metalized through holes, the metal on the lower layer is used as the floor of the rectifying circuit, and the first capacitor 16 and the second capacitor 17 are grounded through the metalized through holes.
The length of the first coupling line is greater than that of the second coupling line, and the sum of the electrical lengths of the first coupling line and the second coupling line equivalent microstrip line is 180 degrees.
As shown in fig. 2, which is a schematic diagram of a rectifying circuit, the odd-mode impedance and the even-mode impedance of the first coupling line 12 and the second coupling line 13 are the same, and only the electrical lengths are different, and the two rectifying branches are completely the same. The first coupling line and the second coupling line are designed according to the formula
Figure BDA0002434784200000061
Figure BDA0002434784200000062
Figure BDA0002434784200000063
Figure BDA0002434784200000064
Wherein f is1And f2Respectively a low frequency point and a high frequency point, Z, in the operating frequency bandceAnd ZcoOdd and even mode impedances, Z, of the first and second coupled lines, respectivelyTIs the characteristic impedance of the microstrip line after the two coupled lines are equivalent to the microstrip line, thetaT1Is that the first coupled line 12 is at the low frequency point f1Electrical length of time-equivalent microstrip line, thetaC1And thetaC2Respectively, the first coupled line 12 and the second coupled line 13 are at the low frequency point f1Electrical length of time. When the first coupling line and the second coupling line satisfy the formulas (1) to (4), the input impedances of the first rectifying path and the second rectifying path may be simultaneously at the low frequency point f1And a high frequency point f2The result of equal amplitude and opposite phase is achieved. Using their phase compensation properties and adjusting f appropriately1And f2Can reduce the total input impedance Z of the rectifier circuit in a wide band rangeinWith the variation range of the input power, the broadband impedance compression is realized. In this embodiment, the widths of the first coupling line and the second coupling line are 1mm and 1.7mm, the width of the coupling line gap is 1mm, the length of the first coupling line is 17.8mm, and the length of the second coupling line is 7.6 mm.
The first rectifying diode 16 and the second rectifying diode 17 are identical, and the first capacitor 19 and the second capacitor 18 are identical.
The structure of a wideband circularly polarized high efficiency rectenna with a wide power range in this embodiment is shown in fig. 1, and the following is only an example of the present invention, and the diode model selected in this example is HSMS-2860 of Agilent corporation, and is packaged by SOT-23. The dielectric substrate adopts Rogers RO4003C, the dielectric constant is 3.66, and the thickness is 1.524 mm. The capacitor is a 100pF capacitor from Murata and the load is 510 omega. The designed working frequency band is 1.7GHz-2.7 GHz.
Fig. 3 is a graph showing simulation results of the input reflection coefficient of the rectifier circuit in the case where the input power is the optimum input power of 14dBm according to the embodiment of the present invention. The numbers on the ordinate in fig. 3 represent the input reflection coefficient S11 in dB, and the abscissa represents the frequency in GHz. Simulation results show that when the optimal input power point is 14dBm, the input reflection coefficient of the embodiment of the invention is less than-15 dB between 1.5GHz and 2.75GHz, and the broadband high-efficiency rectification can be realized. The simulation result proves the correctness and feasibility of the design theory of the invention.
FIG. 4 shows that the electromagnetic power density of the embodiment of the present invention is 5uW/cm2、15uW/cm2、30uW/cm2The test of the rectification efficiency of the antenna is compared with that of a common broadband rectification antenna without using a broadband impedance compression network. The numbers on the ordinate in fig. 4 indicate the rectenna efficiency in% and the abscissa indicates the frequency in GHz. Test results show that the rectifying antenna adopting the broadband impedance compression network can obtain the improvement of the rectifying efficiency in a broadband and broadband power range, particularly the efficiency is improved more obviously under low power, and the rectifying efficiency can be improved by 18.6 percent at most. The simulation results prove the correctness and feasibility of the design theory of the invention.
In summary, the present invention provides a broadband circularly polarized high-efficiency rectenna with a wide power range, which not only can realize broadband rectification, but also can simultaneously widen the input power range within the broadband range, thereby realizing high-efficiency rectification. The invention can be used for reducing the sensitivity of the rectifying circuit to the change of the working frequency and the input power, and is suitable for the receiving end of a broadband microwave wireless energy transmission system.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A broadband circularly polarized high-efficiency rectifying antenna with a wide power range comprises a dielectric substrate and is characterized in that a receiving antenna and a rectifying circuit which are connected through a microstrip line are printed on the dielectric substrate, the receiving antenna is a broadband circularly polarized slot antenna, the broadband circularly polarized slot antenna comprises a square ring groove fed by a 90-degree broadband phase shifter based on a coupling line, the rectifying circuit comprises a first rectifying path and a second rectifying path, and the first rectifying path and the second rectifying path are connected in parallel and then are connected with a load in series and then are grounded.
2. The wideband circularly polarized high efficiency rectenna of claim 1, wherein the coupled line based 90 degree wideband phase shifter is located on the top surface of the dielectric substrate, the square ring slot is located on the bottom surface of the dielectric substrate, and the electrical length of the square ring slot is one wavelength of the center frequency of the operating band.
3. The wideband circularly polarized high-efficiency rectenna according to claim 1, wherein the coupled line-based 90-degree wideband phase shifter comprises a wilkinson power divider, a first Y-shaped microstrip branch, a second Y-shaped microstrip branch, a phase shifter coupling line and a phase shifter microstrip line, wherein the first Y-shaped microstrip branch is connected with the phase shifter microstrip line, the second Y-shaped microstrip branch is connected with the phase shifter coupling line, and the wilkinson power divider combines the output signals of the phase shifter microstrip line and the phase shifter coupling line into one path with equal power and inputs the path into a subsequent rectification circuit.
4. The wideband circularly polarized high efficiency rectenna of claim 1, wherein the first rectenna is composed of a first coupling line and a first rectenna, the second rectenna is composed of a second coupling line and a second rectenna, the first coupling line has a length greater than the second coupling line, and the sum of the electrical lengths of the equivalent microstrip lines of the first coupling line and the second coupling line is 180 degrees.
5. The broadband circularly polarized high-efficiency rectenna of claim 4, wherein the first and second rectennas have the same structure and comprise T-type impedance matching networks, rectifying diodes and capacitors, wherein the T-type impedance matching networks are connected in series with the rectifying diodes, then connected in parallel with the capacitors, and then connected in series with the loads for grounding, thereby realizing the conversion of RF-DC energy.
6. The wideband circularly polarized high efficiency rectenna as claimed in claim 5, wherein the T-impedance matching network comprises a series high impedance microstrip, a shunt low impedance ground, and a series microstrip.
7. The wideband circularly polarized high efficiency rectenna of claim 1, wherein the microstrip line is formed by connecting a section of microstrip line with gradually changing width and a section of microstrip line with fixed width, and the microstrip line is disposed on the upper surface of the dielectric substrate.
8. The wideband circularly polarized high efficiency rectenna of claim 7, further comprising two slots on the lower surface of the dielectric substrate, each slot being perpendicular to both sides of the fixed width microstrip line.
9. The wideband circularly polarized high efficiency rectenna of claim 3, wherein the electrical length of the phase shifter microstrip line is 90 degrees of the center frequency.
10. The wideband circularly polarized high efficiency rectenna of claim 4, wherein the first and second coupling lines satisfy the following conditions:
Figure FDA0002434784190000021
Figure FDA0002434784190000022
Figure FDA0002434784190000023
Figure FDA0002434784190000024
wherein f is1And f2Respectively a low frequency point and a high frequency point, Z, in the operating frequency bandceAnd ZcoOdd and even mode impedances, Z, of the first and second coupled lines, respectivelyTIs the characteristic impedance of the microstrip line after the two coupled lines are equivalent to the microstrip line, thetaT1Is the first coupled line at the low frequency point f1Electrical length of time-equivalent microstrip line, thetaC1And thetaC2The first coupling line and the second coupling line are respectively at a low-frequency point f1Electrical length of time.
CN202010248844.3A 2020-04-01 2020-04-01 Broadband circularly polarized high-efficiency rectifying antenna with wide power range Pending CN111446544A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112510854A (en) * 2020-10-30 2021-03-16 南京航空航天大学 Microwave rectification method for maximum energy transmission of circuit self-switch
CN112701807A (en) * 2020-12-23 2021-04-23 华南理工大学 High-efficiency multi-tone signal rectifier capable of realizing wide input power range
CN113381178A (en) * 2021-06-24 2021-09-10 西安电子科技大学 Integrated small-sized rectifying antenna based on energy collection
CN113690612A (en) * 2021-07-09 2021-11-23 华南理工大学 Full-polarization rectifying antenna with wide bandwidth power range and energy transmission system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112510854A (en) * 2020-10-30 2021-03-16 南京航空航天大学 Microwave rectification method for maximum energy transmission of circuit self-switch
CN112510854B (en) * 2020-10-30 2023-12-29 南京航空航天大学 Microwave rectification method for maximum energy transmission of circuit self-switching
CN112701807A (en) * 2020-12-23 2021-04-23 华南理工大学 High-efficiency multi-tone signal rectifier capable of realizing wide input power range
CN113381178A (en) * 2021-06-24 2021-09-10 西安电子科技大学 Integrated small-sized rectifying antenna based on energy collection
CN113690612A (en) * 2021-07-09 2021-11-23 华南理工大学 Full-polarization rectifying antenna with wide bandwidth power range and energy transmission system
CN113690612B (en) * 2021-07-09 2022-12-16 华南理工大学 Full-polarization rectifying antenna with wide bandwidth power range and energy transmission system

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