CN114678673B - Broadband balun loaded with ferrite magnetic ring - Google Patents
Broadband balun loaded with ferrite magnetic ring Download PDFInfo
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- CN114678673B CN114678673B CN202210350686.1A CN202210350686A CN114678673B CN 114678673 B CN114678673 B CN 114678673B CN 202210350686 A CN202210350686 A CN 202210350686A CN 114678673 B CN114678673 B CN 114678673B
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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
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/06—Coaxial lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a balun for a radio frequency front end of a wireless communication system, in particular to a broadband balun loaded with a ferrite magnetic ring. The technical problems that the existing balun is lack of an impedance transformation function, poor in power capacity and overlarge in low-frequency size are solved. The invention comprises an output port assembly, a coaxial line assembly, a medium substrate assembly and an input port assembly; the coaxial line component comprises two semi-rigid coaxial cables and a plurality of ferrite magnetic rings, and the semi-rigid coaxial cables comprise inner conductors and outer conductors; the input port assembly comprises a balance patch and a rectangular patch; the output port assembly comprises first to fifth microstrip lines and sixth to tenth microstrip lines; the inner conductors at one ends of the two semi-rigid coaxial cables are electrically connected with the rectangular patches, and the outer conductors are electrically connected with the balance patches; the inner conductor at the other end of the first semi-rigid coaxial cable is electrically connected with the outer conductor at the other end of the second semi-rigid coaxial cable, the other inner conductor is connected with the fifth microstrip line, and the other outer conductor is connected with the sixth microstrip line.
Description
Technical Field
The invention relates to a balun for a radio frequency front end of a wireless communication system, in particular to a broadband balun loaded with a ferrite magnetic ring.
Background
Balun is a passive device, which can be used in push-pull amplifier, long-distance transmission, antenna feed network, etc. At present, the Marchand balun is widely applied and is in a microstrip coupling line form, has the advantages of small volume, wide frequency band, easiness in circuit compensation and the like, and is widely applied to various electronic devices. The Marchand balun currently suffers from the following disadvantages in its application: the high-power input device has the defects of overlarge size at low frequency, poor vibration and impact resistance, and easy occurrence of irreversible phenomena such as overheating, bending and even breaking during high-power input.
In recent years, many researchers have explored the design of high power baluns. In 2018, chi Van Pham published in the IEEE Transactions on Microwave Theory and Techniques journal (Vol.66. Pp.902-910, 2015) "Design of 600-W Low-pass Ultra-Wideband Ferritesses Balun", and the paper proposes a broadband Balun capable of bearing 600W power, which adopts a 1.
Disclosure of Invention
The invention aims to solve the technical problems that the existing balun has no impedance transformation function, the power capacity is poor and the low-frequency size is overlarge, and provides a broadband balun loaded with a ferrite magnetic ring.
The technical solution of the invention is as follows:
the utility model provides a broadband balun of loading ferrite bead, includes medium base plate subassembly, sets up input port subassembly, coaxial line subassembly and the output port subassembly that links to each other in proper order on medium base plate subassembly, and its special character lies in:
the coaxial line assembly comprises a first semi-rigid coaxial cable, a second semi-rigid coaxial cable, a plurality of ferrite magnetic rings sleeved on the first semi-rigid coaxial cable and the second semi-rigid coaxial cable, an inner conductor, a dielectric medium and an outer conductor which are coaxially and sequentially arranged in the first semi-rigid coaxial cable and the second semi-rigid coaxial cable from inside to outside;
the dielectric substrate assembly comprises a dielectric substrate and a metal grounding plate which is positioned below the dielectric substrate and used for grounding and bearing the dielectric substrate;
the first semi-rigid coaxial cable and the second semi-rigid coaxial cable with the ferrite magnetic rings are placed in the center of the dielectric substrate in parallel along the length direction, and the distance is reserved;
the input port assembly comprises a balance patch and a rectangular patch etched on the upper surface of one end of the dielectric substrate, and a space is reserved between the balance patch and the rectangular patch;
the medium substrate is provided with a metal through hole for connecting the balance patch and the metal grounding plate;
the output port assembly is arranged on the upper surface of the other end of the medium substrate and comprises an output path and an output path;
the output path comprises a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line and a fifth microstrip line which are etched on the dielectric substrate and electrically connected in sequence;
the output two paths comprise a sixth microstrip line, a seventh microstrip line, an eighth microstrip line, a ninth microstrip line and a tenth microstrip line which are etched on the dielectric substrate and electrically connected in sequence;
the inner conductors at one ends of the first semi-rigid coaxial cable and the second semi-rigid coaxial cable are connected with the rectangular patches, and the outer conductors are connected with the balance patches;
the inner conductor at the other end of the first semi-rigid coaxial cable is electrically connected with the outer conductor at the other end of the second semi-rigid coaxial cable, the inner conductor of the second semi-rigid coaxial cable is connected with the fifth microstrip line, and the outer conductor of the first semi-rigid coaxial cable is connected with the sixth microstrip line;
the widths of the second microstrip line, the fourth microstrip line, the seventh microstrip line and the ninth microstrip line are respectively greater than those of the adjacent microstrip lines;
the characteristic impedance of the rectangular patch is 50 omega, and the characteristic impedance of the first microstrip line and the characteristic impedance of the tenth microstrip line are both 100 omega.
Furthermore, the output one path and the output two paths also comprise transition zones; the microstrip lines with different widths are connected through a transition band, and the transition band is a 45-degree bevel edge; the fifth microstrip line and the sixth microstrip line are provided with 90-degree corners and are subjected to 45-degree chamfering treatment. Microstrip lines with different widths are arranged, the phase and amplitude unbalance degree of the two output ports can be adjusted, and the transmission insertion loss of the microstrip lines can be reduced by the 45-degree corner cut and chamfering treatment.
Furthermore, a rectangular groove is formed in the center of the dielectric substrate along the length direction, and the first semi-rigid coaxial cable and the second semi-rigid coaxial cable are located in the rectangular groove and keep a distance.
Furthermore, the balance patch is of a U-shaped structure with an outward opening, the rectangular patch is located in the U-shaped opening, and a space is reserved between the rectangular patch and the balance patch.
Further, in the output one path and the output two paths, the widths of the second microstrip line and the fourth microstrip line are both 3.5mm, the widths of the seventh microstrip line and the ninth microstrip line are respectively 4.5mm and 3mm, and the widths of the rest microstrip lines are both 1.385mm.
Further, the medium substrate is made of an FR4 medium material, and the rectangular patch and the balance patch are made of copper-clad materials.
Further, the inner conductor and the outer conductor of the first semi-rigid coaxial cable and the second semi-rigid coaxial cable are both made of copper, and the dielectric between the inner conductor and the outer conductor is a dielectric material with a dielectric constant of 1.24.
Furthermore, the ferrite magnetic rings on the first semi-rigid coaxial cable and the second semi-rigid coaxial cable are the same in number and are uniformly distributed.
Furthermore, the characteristic impedance of the first semi-rigid coaxial cable and the characteristic impedance of the second semi-rigid coaxial cable are both 100 Ω, and the first semi-rigid coaxial cable can be well matched with the input port 50 Ω and the output port 100 Ω.
Further, the number of the ferrite beads on the first semi-rigid coaxial cable and the second semi-rigid coaxial cable is eight.
The invention has the beneficial effects that:
1. the transmission feeder line of the balun input port is provided with 50 omega characteristic impedance which is matched with a high-impedance antenna, so that the impedance conversion function can be realized.
2. The balun adopts the semi-rigid coaxial line as an energy transmission carrier and is sleeved with the ferrite magnetic ring with high magnetic conductivity, so that the balun has good power bearing capacity, the coupling of a cable is enhanced, and the performance of the balun at low frequency is optimized and improved.
3. The lowest frequency of the balun is 10MHz, the problem that the Marchand balun is too large in size at low frequency is solved, and cost is saved.
4. The two output ports (one output path and two output paths) of the balun are provided with two sections of step-shaped microstrip lines, and the unbalance degree of the balun output can be compensated and adjusted.
5. The balun adopts a coaxial line as an energy carrier, has larger power capacity, can solve the problem that the Marchand balun is easy to break down, simultaneously, the Marchand balun generally works at more than 1GHz, other working frequency bands are lower, and the balun can work in the frequency band from 0.01GHz to 1.5GHz and cover various balun frequency bands.
6. Compared with the existing similar balun, the balun has smaller imbalance degree of output amplitude and phase, the imbalance degree of the phase is within 3%, and the imbalance degree of the amplitude is within 2%.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is a top view of an embodiment of the present invention;
FIG. 3 is a side view (input end direction) of an embodiment of the present invention;
FIG. 4 is a simulated reflectance S11 curve, insertion loss S21 and S31 curve of an embodiment of the present invention;
FIG. 5 is a simulated phase imbalance curve according to an embodiment of the present invention;
fig. 6 is a graph of simulated amplitude imbalance according to an embodiment of the present invention.
Reference numerals:
101-a first microstrip line, 102-a second microstrip line, 103-a third microstrip line, 104-a fourth microstrip line, 105-a fifth microstrip line, 106-a sixth microstrip line, 107-a seventh microstrip line, 108-an eighth microstrip line, 109-a ninth microstrip line, 110-a tenth microstrip line; 21-a first semi-rigid coaxial cable, 22-a second semi-rigid coaxial cable, 23-a conducting wire, 24-a ferrite magnetic ring; 31-metal ground plate, 32-dielectric substrate; 41-rectangular patch, 42-metal via, 43-balance patch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments and the accompanying drawings, and the embodiments and the descriptions of the present invention are only used for explaining the present invention and are not used as limiting the present invention.
The invention discloses a broadband balun loaded with a ferrite magnetic ring, which comprises a dielectric substrate assembly, an input port assembly, a coaxial line assembly and an output port assembly, wherein the input port assembly, the coaxial line assembly and the output port assembly are sequentially connected to the dielectric substrate assembly, and are shown in figures 1 to 3.
The coaxial line component comprises a first semi-rigid coaxial cable 21, a second semi-rigid coaxial cable 22, sixteen ferrite magnetic rings 24 sleeved on the two semi-rigid coaxial cables, an inner conductor, a dielectric medium and an outer conductor which are coaxially and sequentially arranged in the first semi-rigid coaxial cable 21 and the second semi-rigid coaxial cable 22 from inside to outside; the ferrite beads 24 on the first semi-rigid coaxial cable 21 and the second semi-rigid coaxial cable 22 are the same in number and are uniformly distributed, that is, the number of the ferrite beads 24 on the first semi-rigid coaxial cable 21 and the second semi-rigid coaxial cable 22 is eight. The number of ferrite beads 24 per semi-rigid coaxial cable in other examples is not limited to eight. The characteristic impedance of the first semi-rigid coaxial cable 21 and the second semi-rigid coaxial cable 22 are both 100 Ω. The inner and outer conductors of the first and second semi-rigid coaxial cables 21 and 22 are both copper, and the dielectric between the inner and outer conductors is a dielectric material with an electrical constant of 1.24. The first semi-rigid coaxial cable 21 and the second semi-rigid coaxial cable 22 are both La, in this example La is 70mm, the inner conductor radius is R1, the outer conductor radius is R2, in this example R1 is 0.65mm, and R2 is 3.0mm. The width of the ferrite bead 24 is b, and the inner radius and the outer radius are R3 and R4, respectively, 5.0mm for b, 3.02mm for R3, and 3.20mm for R4 in this example.
The dielectric substrate assembly includes a dielectric substrate 32, a metallic ground plate 31 located below the dielectric substrate 32 for grounding and carrying the dielectric substrate 32. The dielectric substrate 32 has a thickness H, a length L and a width D, in this example H being 3.0mm, L being 110mm and D being 60mm. The center of the dielectric substrate 32 is provided with a rectangular groove, the length and the width of the rectangle are l and d respectively, in the example, l is 70mm, and d is 30mm. The first semi-rigid coaxial cable 21 and the second semi-rigid coaxial cable 22 with the ferrite magnetic ring 24 are placed in the rectangular groove of the dielectric substrate 32 in parallel along the length direction, are symmetrical to the central line and keep a distance of 15mm. The dielectric substrate 32 is an FR4 dielectric material.
The input port assembly comprises a rectangular patch 41 and a balance patch 43 etched on the upper surface of one end of the dielectric substrate 32, and a gap is reserved between the balance patch 43 and the rectangular patch 41; the rectangular patch 41 is the input port of the balun. The balancing patch 43 is in the form of a U-shaped structure with the opening facing outwards, and the rectangular patch 41 is located within the U-shaped opening. The dielectric substrate 32 is provided with a metal via 42 for connecting the balance patch 43 andthe metallic ground plate 31 grounds the signal conductor; the balance patch 43 is above the dielectric substrate 32 forming a plane with the signal conductors in this plane, and the grounding performance is achieved by connecting the top balance patch 43 to the bottom ground plane through metal vias 42. The rectangular patches 41 and the balance patches 43 are both made of copper-clad material. The rectangular patch 41 has a width W 1 Example W 1 Is 5.76mm.
The output port assembly is arranged on the upper surface of the other end of the medium substrate 32 and comprises a first output path and a second output path. The two outputs comprise ten microstrip lines in total. The output path comprises a first microstrip line 101, a second microstrip line 102, a third microstrip line 103, a fourth microstrip line 104 and a fifth microstrip line 105 which are etched on the dielectric substrate 32 and electrically connected in sequence; the output two paths comprise a sixth microstrip line 106, a seventh microstrip line 107, an eighth microstrip line 108, a ninth microstrip line 109 and a tenth microstrip line 110 which are etched on the dielectric substrate 32 and electrically connected in sequence. In the output one way and the output two ways, the widths of the second microstrip line 102, the fourth microstrip line 104, the seventh microstrip line 107 and the ninth microstrip line 109 are respectively greater than those of the adjacent microstrip lines; the widths of the second microstrip line 102 and the fourth microstrip line 104 are D1 and D2, respectively, and in this example, both D1 and D2 are 3.5mm; the widths of the seventh microstrip line 107 and the ninth microstrip line 109 are D3 and D4, respectively, in this example, D3 and D4 are 4.5mm and 3mm, respectively, and the widths of the rest microstrip lines are W 2 In this example W 2 Taking is not limited to 1.38mm. The output path and the output path both comprise transition zones; the microstrip lines with different widths are connected through a transition band, and the transition band is a 45-degree bevel edge; the fifth microstrip line 105 and the sixth microstrip line 106 both have 90 ° corners and are chamfered at 45 °. Microstrip lines with different widths are arranged, the problem of phase and amplitude unbalance of the two output ports can be solved, and microstrip line transmission insertion loss can be reduced through 45-degree corner cutting and chamfering treatment.
The inner conductors at one ends of the first semi-rigid coaxial cable 21 and the second semi-rigid coaxial cable 22 are electrically connected with the rectangular patch 41 through a lead 23, and the outer conductors are electrically connected with the balance patch 43 through the lead 23; the inner conductor at the other end of the first semi-rigid coaxial cable 21 is electrically connected with the outer conductor at the other end of the second semi-rigid coaxial cable 22, the inner conductor of the second semi-rigid coaxial cable 22 is connected with the fifth microstrip line 105, and the outer conductor of the first semi-rigid coaxial cable 21 is connected with the sixth microstrip line 106;
the characteristic impedance of the input port rectangular patch 41 is 50 Ω, and the characteristic impedances of the first microstrip line 101 of the one-way output port and the tenth microstrip line 110 of the two-way output port are both 100 Ω. The input port can be connected with a transmission feeder with 50 omega characteristic impedance, the output port can be connected with a high-input impedance antenna, matching between the feeder and the antenna is realized, and meanwhile, an impedance transformation function can be realized.
The balun can work in a frequency band from 0.01GHz to 1.5GHz, and covers various balun frequency bands; meanwhile, the invention has the advantages of compact structure, wide bandwidth, high power capacity and impedance transformation, and can be used for differential feed and push-pull amplifier of high-power antenna.
The technical effects of the present invention are further described below in conjunction with the simulation results:
1. simulation conditions
CST three-dimensional electromagnetic field simulation software was used. The CST studio suite is a professional simulation software package which is comprehensive, accurate and extremely high in integration level and faces 3D electromagnetic, circuit, temperature and structural stress design engineers. The system comprises eight working room sub-software which are integrated in the same user interface, and provides complete system-level and component-level numerical simulation optimization for users. Software covers the whole electromagnetic frequency range, and a complete time domain and frequency domain full-wave electromagnetic algorithm and a complete high-frequency algorithm are provided. The embodiment of the invention utilizes the CST microwave simulation function to carry out simulation analysis on the return loss, the insertion loss, the phase unbalance and the amplitude unbalance of the balun.
2. Simulation result
FIG. 4 is a simulation graph of return loss and insertion loss of the balun of the present invention at 100 kHz-1.70 GHz, it can be seen that the return loss (simulated return loss S11) of the input port of the balun of the present invention is below-10 dB in the range of 0.01 GHz-1.24 GHz, and at the same time, the insertion loss (simulated transmission coefficient S21) of the port of one output path is between-3.0 dB to-5.0 dB and the insertion loss (simulated transmission coefficient S31) of the port of two output paths is between-3.0 dB to-5.5 dB in the range of 0.01 GHz-1.24 GHz.
Fig. 5 is a phase imbalance curve of the balun of the present invention at 0.01GHz to 1.5GHz, which includes phase parameters (simulated phase coefficients S31 phase) of the port of the output one path, phase parameters (simulated phase coefficients S21 phase) of the port of the output two paths, and their difference, and it can be seen that the output phase imbalance of the balun of the present invention is within 3% in the frequency band. Fig. 6 is an amplitude imbalance curve of the balun in the range of 0.01GHz to 1.5GHz, including the time domain waveforms of the input ports, the time domain waveforms of the output one port, and the time domain waveforms of the output two ports, and it can be seen that the output amplitude imbalance of the balun in the frequency band is within 2%. As can be seen from fig. 5 and 6, the balun of the present invention has good matching in a wide frequency range, and the output phase substantially matches the phase difference of 180 °.
The above description and examples are only preferred embodiments of the present invention and should not be construed as limiting the present invention, it will be obvious to those skilled in the art that various modifications and changes in form and detail may be made based on the principle and construction of the present invention after understanding the content and design principle of the present invention, but such modifications and changes based on the inventive concept are still within the scope of the appended claims.
Claims (8)
1. The utility model provides a broadband balun of loading ferrite bead, includes medium base plate subassembly, sets up input port subassembly, coaxial line subassembly and the output port subassembly that links to each other in proper order on medium base plate subassembly, its characterized in that:
the coaxial line assembly comprises a first semi-rigid coaxial cable (21), a second semi-rigid coaxial cable (22), a plurality of ferrite magnetic rings (24) sleeved on the first semi-rigid coaxial cable (21) and the second semi-rigid coaxial cable (22), and an inner conductor, a dielectric medium and an outer conductor which are coaxially and sequentially arranged in the first semi-rigid coaxial cable (21) and the second semi-rigid coaxial cable (22) from inside to outside;
the dielectric substrate assembly comprises a dielectric substrate (32), and a metal grounding plate (31) which is positioned below the dielectric substrate (32) and used for grounding and bearing the dielectric substrate (32);
a first semi-rigid coaxial cable (21) and a second semi-rigid coaxial cable (22) with ferrite magnetic rings (24) are placed in the center of a dielectric substrate (32) in parallel along the length direction, and the distance is reserved;
the input port assembly comprises a balance patch (43) and a rectangular patch (41) which are etched on the upper surface of one end of the dielectric substrate (32), and a space is reserved between the balance patch (43) and the rectangular patch (41);
the dielectric substrate (32) is provided with a metal through hole (42) for connecting the balance patch (43) and the metal grounding plate (31);
the output port assembly is arranged on the upper surface of the other end of the medium substrate (32) and comprises an output path and an output path;
the output path comprises a first microstrip line (101), a second microstrip line (102), a third microstrip line (103), a fourth microstrip line (104) and a fifth microstrip line (105) which are etched on the dielectric substrate (32) and electrically connected in sequence;
the output two paths comprise a sixth microstrip line (106), a seventh microstrip line (107), an eighth microstrip line (108), a ninth microstrip line (109) and a tenth microstrip line (110) which are etched on the dielectric substrate (32) and electrically connected in sequence;
the inner conductors at one ends of the first semi-rigid coaxial cable (21) and the second semi-rigid coaxial cable (22) are connected with the rectangular patch (41), and the outer conductors are connected with the balance patch (43);
the inner conductor at the other end of the first semi-rigid coaxial cable (21) is electrically connected with the outer conductor at the other end of the second semi-rigid coaxial cable (22), the inner conductor of the second semi-rigid coaxial cable (22) is connected with the fifth microstrip line (105), and the outer conductor of the first semi-rigid coaxial cable (21) is connected with the sixth microstrip line (106);
the widths of the second microstrip line (102), the fourth microstrip line (104), the seventh microstrip line (107) and the ninth microstrip line (109) are respectively greater than those of the adjacent microstrip lines;
the characteristic impedance of the rectangular patch (41) is 50 omega, and the characteristic impedances of the first microstrip line (101) and the tenth microstrip line (110) are both 100 omega;
the output one path and the output two paths also comprise transition zones;
the microstrip lines with different widths are connected through a transition band, and the transition band is a 45-degree bevel edge;
the fifth microstrip line (105) and the sixth microstrip line (106) are provided with 90-degree corners and are subjected to 45-degree chamfering treatment;
in the output one way and the output two ways, the widths of the second microstrip line (102) and the fourth microstrip line (104) are both 3.5mm, the widths of the seventh microstrip line (107) and the ninth microstrip line (109) are respectively 4.5mm and 3mm, and the widths of the rest microstrip lines are both 1.385mm.
2. The wideband balun loaded with a ferrite bead as claimed in claim 1, wherein:
the center of the medium substrate (32) is provided with a rectangular groove along the length direction, and the first semi-rigid coaxial cable (21) and the second semi-rigid coaxial cable (22) are both positioned in the rectangular groove and keep a distance.
3. The wideband balun loaded with a ferrite bead as claimed in claim 2, wherein:
the balance patch (43) is of a U-shaped structure with an outward opening, the rectangular patch (41) is located in the U-shaped opening, and a space is reserved between the rectangular patch (41) and the balance patch (43).
4. The wideband balun loaded with a ferrite bead as claimed in claim 3, wherein:
the medium substrate (32) is made of FR4 medium materials, and the rectangular patch (41) and the balance patch (43) are made of copper-clad materials.
5. The wideband balun loaded with a ferrite bead as claimed in claim 4, wherein:
the inner conductor and the outer conductor of the first semi-rigid coaxial cable (21) and the second semi-rigid coaxial cable (22) are both made of copper materials, and a dielectric material with the dielectric constant of 1.24 is arranged between the inner conductor and the outer conductor.
6. The wideband balun loaded with a ferrite bead as claimed in claim 5, wherein:
the ferrite magnetic rings (24) on the first semi-rigid coaxial cable (21) and the second semi-rigid coaxial cable (22) are the same in number and are uniformly distributed.
7. The wideband balun loaded with a ferrite bead as claimed in claim 6, wherein:
the characteristic impedance of the first semi-rigid coaxial cable (21) and the characteristic impedance of the second semi-rigid coaxial cable (22) are both 100 omega.
8. The wideband balun loaded with a ferrite bead as claimed in claim 7, wherein:
the number of the ferrite magnetic rings (24) on the first semi-rigid coaxial cable (21) and the second semi-rigid coaxial cable (22) is eight.
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| CN202210350686.1A CN114678673B (en) | 2022-04-02 | 2022-04-02 | Broadband balun loaded with ferrite magnetic ring |
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| CN202210350686.1A CN114678673B (en) | 2022-04-02 | 2022-04-02 | Broadband balun loaded with ferrite magnetic ring |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767019A (en) * | 2015-04-21 | 2015-07-08 | 中国电子科技集团公司第四十一研究所 | Power distribution and combination machine based on ultra wide band coaxial impedance transformer |
| CN105789802A (en) * | 2014-12-15 | 2016-07-20 | 南京理工大学 | Ultra-wideband Balun based on new interconnection structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201408832Y (en) * | 2009-05-18 | 2010-02-17 | 北京瑞夫艾电子有限公司 | Balun impedance converter used for radio frequency push-pull power amplifier |
| CN111129681B (en) * | 2018-10-31 | 2021-05-07 | 华为技术有限公司 | Balance-unbalance conversion device, communication device and communication system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105789802A (en) * | 2014-12-15 | 2016-07-20 | 南京理工大学 | Ultra-wideband Balun based on new interconnection structure |
| CN104767019A (en) * | 2015-04-21 | 2015-07-08 | 中国电子科技集团公司第四十一研究所 | Power distribution and combination machine based on ultra wide band coaxial impedance transformer |
Non-Patent Citations (2)
| Title |
|---|
| Design of 600 W Low Loss Ultra-wideband Ferriteless Balun;Chi Van Pham等;《IEEE Transactions on Microwave Theory and Techniques》;20171127;第66卷(第2期);论文第1-7页 * |
| The off-center-fed dipole revisited: a broadband, multiband antenna;J.Belrose等;《QST》;19901231;论文第5页 * |
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