CN114069227B - Multiband antenna - Google Patents
Multiband antenna Download PDFInfo
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- CN114069227B CN114069227B CN202010747629.8A CN202010747629A CN114069227B CN 114069227 B CN114069227 B CN 114069227B CN 202010747629 A CN202010747629 A CN 202010747629A CN 114069227 B CN114069227 B CN 114069227B
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- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 107
- 238000013461 design Methods 0.000 description 20
- 238000002955 isolation Methods 0.000 description 15
- 230000008878 coupling Effects 0.000 description 8
- 238000010168 coupling process Methods 0.000 description 8
- 238000005859 coupling reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000005404 monopole Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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Abstract
The embodiment of the invention provides a multi-band antenna, which comprises an antenna device and a double-feed filter device; the antenna device is connected with the double-fed filtering device; the double-feed filter device is used for doubly exciting the same radiator of the antenna device, so that signals in different frequency bands passing through the double-feed filter device enter the antenna device. The embodiment of the invention can increase the coverage bandwidth and realize the coverage of the multi-band bandwidth.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a multi-band antenna.
Background
The antenna has the function of effectively transmitting and effectively receiving radio frequency signals, and resonant branches of the antenna have frequency bandwidths, so that the requirements on the coverage bandwidth of the antenna are higher along with the development of communication.
At present, the coverage of the bandwidth is realized by arranging an external antenna or an internal antenna, but the coverage bandwidth is insufficient, and the requirement of more frequency bands is not satisfied.
Disclosure of Invention
The embodiment of the invention provides a multi-band antenna which can increase coverage bandwidth and realize the coverage of the multi-band bandwidth.
In a first aspect, an embodiment of the present invention provides a multiband antenna, including: an antenna device and a double-feed filter device; the antenna device is connected with the double-fed filtering device;
the double-feed filter device is used for doubly exciting the same radiator of the antenna device, so that signals in different frequency bands passing through the double-feed filter device enter the antenna device.
In one possible design, the antenna device is provided with an external antenna and a circuit board;
the external antenna and the double-fed filter device are both arranged on a circuit board, and the external antenna is connected with the double-fed filter device;
the external antenna is used for receiving the bandwidth signals of multiple frequency bands passing through the double-fed filter device.
In one possible design, the double-feed filter device includes a first feed interface, a second feed interface, a high-pass filter circuit, and a low-pass filter circuit;
the first feed interface is respectively connected with the low-pass filter circuit, the high-pass filter circuit and the second feed interface in sequence;
the output end of the low-pass filter circuit and the output end of the high-pass filter circuit are the output ends of the double-feed filter device, and the output ends of the double-feed filter device are connected with the external antenna;
the first feed interface and the second feed interface are both used for providing a signal source for exciting the external antenna, the low-pass filter circuit is used for filtering medium-high frequency signals so that signals passing through the low-pass filter circuit enter the external antenna, and the high-pass filter circuit is used for filtering low-frequency signals so that signals passing through the high-pass filter circuit enter the external antenna;
the double-feed filter device is used for doubly exciting the same radiator of the external antenna.
In one possible design, the low pass filter circuit includes a first capacitor, a first inductor, and a second inductor;
the first feed interface is respectively connected with one end of the first capacitor and one end of the second inductor, the other end of the first capacitor is grounded through the first inductor, the other end of the second inductor is connected with the second feed interface through the high-pass filter circuit, and the other end of the second inductor is also connected with the external antenna;
the resistance value of the first inductor is larger than that of the second inductor.
In one possible design, the high pass filter circuit includes a second capacitor, a third capacitor, and a third inductor;
the second feed interface is respectively connected with one end of the second capacitor and one end of the third capacitor, the other end of the second capacitor is grounded through the third inductor, the other end of the third capacitor is connected with the first feed interface through the low-pass filter circuit, and the other end of the third capacitor is also connected with the external antenna;
wherein the capacitance of the second capacitor is larger than the capacitance of the third capacitor.
In one possible design, the double-fed filtering device further includes a low-frequency matching circuit;
the first feed interface is connected with the low-pass filter circuit through the low-frequency matching circuit;
the low-frequency matching circuit is used for adjusting the low-frequency impedance of the external antenna.
In one possible design, the low frequency matching circuit includes: a fourth inductance and a fourth capacitance;
the first feed interface is connected with one end of the fourth inductor, the other end of the fourth inductor is grounded through the fourth capacitor, and the other end of the fourth inductor is also connected with the low-pass filter circuit.
In one possible design, the double-fed filtering device further comprises a medium-high frequency matching circuit;
the second feed interface is connected with the low-pass filter circuit through the medium-high frequency matching circuit;
the middle-high frequency matching circuit is used for adjusting the middle-high frequency impedance of the external antenna.
In one possible design, the medium-high frequency matching circuit includes: a fifth capacitor, a sixth capacitor and a fifth inductor;
the second feed interface is respectively connected with one end of the sixth capacitor and one end of the fifth inductor through the fifth capacitor, the other end of the sixth capacitor is connected with the high-pass filter circuit, and the other end of the fifth inductor is grounded.
In one possible design, the external antenna has a topology that is determined by adjusting the coverage frequency band of the external antenna.
The multiband antenna provided by the embodiment is provided with the antenna device and the doubly-fed filter device, wherein the antenna device is connected with the doubly-fed filter device, and the same radiator of the antenna device can be excited doubly by the doubly-fed filter device, so that signals in different frequency bands passing through the doubly-fed filter device enter the antenna device, the coverage bandwidth is increased, the coverage of the multiband bandwidth is realized, meanwhile, the doubly-fed filter device can solve the problem of mutual coupling between doubly-fed devices, isolation is not needed any more, and the space utilization rate is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic view of a scenario of a multiband antenna according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multiband antenna according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a multiband antenna according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a multiband antenna according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a multiband antenna according to another embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Currently, coverage of a certain frequency band bandwidth is achieved by adopting an external antenna and an internal antenna, for example: an external antenna is arranged, the external antenna only has one feed, and only uses 1/4λ,3/4λ,5/4λ,7/4λ and other frequency doubling resonance of a monopole, but the bandwidth is insufficient to meet the full-band requirements of 380 Mhz-960 Mhz and 1447-2690 Mhz; or an external antenna is provided with an extra branch on the monopole to realize other resonances, but the bandwidth is insufficient to meet the full-band requirements of 380 Mhz-960 Mhz and 1447-2690 Mhz; or a built-in antenna is arranged, double feed switching is performed through a switch, the influence of a head and a hand is improved, but switching is performed through a tuning switch, so that switching loss is easy to introduce, and in addition, the risk of switch overvoltage exists; or the built-in double-feed antenna excites 2 different radiators, but the radiators are connected, and the coupling between 2 feed points is reduced by isolating, but the space utilization degree is still not high enough because of the ground structure. Therefore, the prior art has a series of problems of insufficient bandwidth, switching loss, switching overvoltage, low space utilization and the like.
In order to solve the above problems, the technical concept of the invention is to utilize the double-fed excited external antenna to excite the same radiator, for example, the problem of mutual coupling between double feeds can be solved through a low-pass filter circuit and a high-pass filter circuit, isolation is not needed any more, and the antenna performance is improved.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 is a schematic view of a scenario of a multiband antenna according to an embodiment of the present invention. A multi-band antenna comprising: the antenna device is connected with the double-feed filter device.
Wherein the double-feed filter device is used for doubly exciting the same radiator (see fig. 1) of the antenna device, so that signals of different frequency bands passing through the double-feed filter device enter the antenna device; the antenna device is used for receiving signals of different frequency bands and realizing full-band bandwidth coverage on multiple frequency bands. The antenna device comprises an external antenna 20 and a circuit board 10.
In this embodiment, the problem that the same radiator antenna with the double feed point and the 2 feed ports are seriously coupled can be solved by using the double feed filter device, so that signals with different frequency bands passing through the double feed filter device enter the antenna device, and an external antenna covering the full frequency bands of 380-960 Mhz and 1447-2690 Mhz is realized.
The multiband antenna provided by the embodiment is provided with the antenna device and the doubly-fed filter device, wherein the antenna device is connected with the doubly-fed filter device, and the same radiator of the antenna device can be excited doubly by the doubly-fed filter device, so that signals in different frequency bands passing through the doubly-fed filter device enter the antenna device, the coverage bandwidth is increased, the coverage of the multiband bandwidth is realized, meanwhile, the doubly-fed filter device can solve the problem of mutual coupling between doubly-fed devices, isolation is not needed any more, and the space utilization rate is higher.
In one possible design, this embodiment provides an external antenna and a circuit board for the antenna device based on the above embodiments.
The external antenna and the double-fed filtering device are arranged on the circuit board, and the external antenna is connected with the double-fed filtering device; the external antenna is used for receiving the bandwidth signals of multiple frequency bands passing through the double-fed filter device.
In this embodiment, the circuit board may be a 174×60mm PCB board, and the external antenna has a topology structure: the monopole and the multi-branch can increase the coverage bandwidth. Wherein, the total antenna topology of external antenna topology adds terminal 96mm. Wherein the length of the external antenna is related to adjusting the low frequency.
Specifically, the external antenna and the double-fed filter device are both arranged on the PCB, wherein the external antenna (which is a monopole antenna) can be arranged at a position on the PCB where current is distributed less, such as a narrow-side corner position on the PCB, so that the current on the circuit board can well excite a resonance mode of the external antenna; the current distribution on the circuit boards with different frequencies is different, so that the external antenna is arranged according to a specific current distribution scene. The signal source on the PCB board can provide signals to excite the external antenna, and can also provide a double-feed filter device, namely the double-feed filter device is arranged on the circuit board. In addition, the PCB board can help the external antenna radiate at low frequency, can be understood as a part of the external antenna, and can be equivalently used as a dipole antenna.
The antenna device can comprise an input end and an output end, wherein the PCB is connected with the input end and is connected with the external antenna through the output end. An external antenna with a topological structure can receive the multi-band bandwidth signal passing through the double-feed filter device.
In one possible design, the external antenna has a topology that is determined by adjusting the coverage frequency band of the external antenna.
In this embodiment, the topology structure of the external antenna has an influence on the performance of the whole external antenna, where the antenna topology can generate more resonances, and can cover as many frequency band bandwidth signals as possible, so as to realize full frequency band coverage and meet the full frequency band requirements of 380 Mhz-960 Mhz and 1447-2690 Mhz. The topology structure can be different because the bandwidths required to be covered by the set external antenna are different, so that the design of the antenna topology needs to be used for increasing the coverage bandwidth according to specific scenes.
In one possible design, referring to fig. 2, fig. 2 is a schematic structural diagram of a multiband antenna according to an embodiment of the present invention, and the embodiment describes a double-feed filtering device in detail based on the above embodiment. The double-feed filter device comprises a first feed interface, a second feed interface, a high-pass filter circuit and a low-pass filter circuit.
The first feed interface is respectively connected with the low-pass filter circuit, the high-pass filter circuit and the second feed interface in sequence.
The output end of the low-pass filter circuit and the output end of the high-pass filter circuit are the output ends of the double-feed filter device, and the output end of the double-feed filter device is connected with the external antenna.
The first feed interface and the second feed interface are both used for providing a signal source for exciting the external antenna, the low-pass filter circuit is used for filtering medium-high frequency signals so that signals passing through the low-pass filter circuit enter the external antenna, and the high-pass filter circuit is used for filtering low-frequency signals so that signals passing through the high-pass filter circuit enter the external antenna.
Furthermore, the double-feed filter device is used for doubly exciting the same radiator of the external antenna.
In this embodiment, the double-feed filter device includes a double-feed filter circuit, i.e., a high-pass filter circuit and a low-pass filter circuit, which is disposed on a circuit board. The circuit board is also provided with at least two feed interfaces, namely a first feed interface 1 and a second feed interface 2, which are used for providing a feed source for exciting the external antenna, wherein the feed source can be provided by the circuit board or other equipment.
Wherein, the feed source (signal source) provided by the first feed interface only allows the low-frequency signal to enter through the low-pass filter circuit, wherein, the first feed interface can be used for providing the low-frequency signal; the feed source (signal source) provided by the second feed interface only allows the medium-high frequency signal to enter through the high-pass filter circuit, wherein the second feed interface can be used for providing the medium-high frequency signal; in addition, the frequency bands can be not distinguished, signals of all the frequency bands can enter through the two feed ports, when the signals pass through the low-pass filter circuit, only low-frequency signals can enter the external antenna, and when the signals pass through the high-pass filter circuit, only medium-high-frequency signals can enter the external antenna.
Specifically, the double-feed filter device can excite the same radiator of the external antenna through the active matching network, so that the problem of serious coupling of 2 feed ports is solved, after doubly exciting the same radiator of the external antenna, a low-frequency signal (380-960 Mhz) enters the antenna through a low-pass filter circuit, and a medium-high frequency channel (1447 Mhz-2690 Mhz) enters the antenna through a high-pass filter circuit, namely, the medium-high frequency channel enters the antenna through a port 3 shown in fig. 2 (the other end of the second inductor L2 and the other end of the third capacitor C3 are both used as the port 3, namely, the output end of the double-feed filter device). The parameters of the 3D simulated external antenna are imported by the port 3, and can be equivalently connected with the input end of the antenna device, namely, the external antenna.
Therefore, the isolation degree of the double feed port is increased by utilizing the low-pass filter circuit and the high-pass filter circuit, so that the double feed excites the same radiator of the external antenna, and the problem of serious coupling of the double feed port and the 2 feed port of the same radiator antenna can be solved. Meanwhile, when one feed interface in the prior art is used, low frequency or high frequency is biased, if low frequency matching is selected, high frequency is easy to filter, performance is reduced, and double resonance in a certain frequency band is intelligently realized.
In one possible design, referring to the low-pass filter circuit in fig. 2, the present embodiment is described in detail on the basis of the above embodiment. The low-pass filter circuit comprises a first capacitor, a first inductor and a second inductor.
The first feed interface is respectively connected with one end of the first capacitor and one end of the second inductor, the other end of the first capacitor is grounded through the first inductor, the other end of the second inductor is connected with the second feed interface through the high-pass filter circuit, and the other end of the second inductor is also connected with the external antenna. The resistance of the first inductor is larger than that of the second inductor.
In this embodiment, the low-pass filter circuit is composed of a first capacitor C1, a first inductor L1 and a second inductor L2, where the first capacitor C1 is connected in series with the first inductor L1, one end of the first capacitor C1 is connected with one end of the first feeding interface 1 and one end of the second inductor L2 respectively, the other end of the first inductor L1 is grounded, and the other end of the second inductor is connected with the second feeding interface 2 through the high-pass filter circuit. The other end of the second inductor can be connected with an external antenna. So that the low-frequency signal enters the external antenna through the low-pass filter circuit.
Illustratively, the first inductance L1 may be 47n (i.e., 47 nanohenries), the capacitance of the first capacitance C1 may be 8p (i.e., 8 picofarads), and the second inductance may be 22n.
In one possible design, referring to the high-pass filter circuit in fig. 2, the present embodiment is described in detail on the basis of the above embodiment. The high-pass filter circuit comprises a second capacitor, a third capacitor and a third inductor.
The second feed interface is respectively connected with one end of the second capacitor and one end of the third capacitor, the other end of the second capacitor is grounded through the third inductor, the other end of the third capacitor is connected with the first feed interface through the low-pass filter circuit, and the other end of the third capacitor is also connected with the external antenna; the capacitance of the second capacitor is larger than the capacitance of the third capacitor.
In this embodiment, the high-pass filter circuit is composed of a second capacitor C2, a third capacitor C3 and a third inductor L3, where the second capacitor C2 is connected in series with the third inductor L3, one end of the second capacitor C2 is connected with one end of the second feeding interface 2 and one end of the third capacitor C3 respectively, the other end of the third inductor L3 is grounded, and the other end of the third capacitor C3 is connected with the first feeding interface 1 through the low-pass filter circuit. The other end of the third capacitor can be connected with an external antenna. The medium-high frequency signal enters the external antenna through the high-pass filter circuit.
Illustratively, the capacitance of the second capacitor C2 may be 15p, the capacitance of the third capacitor C3 may be 0.5p, and the third inductance may be 12n.
Specifically, as shown in fig. 2, the first feeding interface 1 is disposed at a first end of the low-pass filter circuit (i.e., one end of the first capacitor C1 and one end of the second inductor L2), and the second feeding interface 2 is disposed at a first end of the high-pass filter circuit (i.e., one end of the second capacitor C2 and one end of the third capacitor C3); the first capacitor C1 is connected in series with the first inductor L1, and the second capacitor C2 is connected in series with the third inductor L3; one end of the first capacitor C1 is connected to one end of the first feeding interface 1 and one end of the second inductor L2, the other end of the first capacitor is grounded through the first inductor L1, the other end of the second inductor L2 is connected to the other end of the third capacitor C3, one end of the third capacitor C3 is connected to one end of the second capacitor C2 and one end of the second feeding interface 2, and the other end of the second capacitor C2 is grounded through the third inductor L3. Wherein, a port 3 is disposed at a position where the other end of the second inductor L2 is connected with the other end of the third capacitor C3, and parameters of the 3D simulation external antenna are imported through the port 3, equivalently, the port 3 is connected with the external antenna (i.e. the port 3 is connected with an input end of the antenna device, and an output end of the antenna device is connected with the external antenna).
Therefore, by using the double-feed filter device, the low-frequency signal passes through the low-pass filter circuit, the middle-high frequency signal passes through the middle-high pass filter circuit, and the isolation between 2 feed ports is increased, so that the double-feed excited external antenna has the same radiator, after doubly-fed excited the same external antenna radiator, the low-frequency signal (380-960 Mhz) enters the antenna through the low-pass filter circuit, the middle-high frequency channel (1447 MHz-2690 Mhz) enters the antenna through the high-pass filter circuit, the problem of serious coupling between 2 feed ports of the double-feed identical radiator antenna can be solved, and the full frequency range of 380-960 Mhz and 1447-2690 Mhz can be covered. If the multi-band antenna is not provided with a double-feed filter circuit, through simulation, S parameters corresponding to the two feed ports can obtain that the resonance of the antenna is shallow, the isolation degree from 380Mhz to 2690Mhz is poor overall, and the fact that the two feed couplings are serious and the full-band coverage of 380-960 Mhz and 1447-2690 Mhz cannot be met is indicated. Wherein, the S parameter may include S11 (return loss of the first power supply interface), S21 (isolation of the first power supply interface to the second power supply interface), S22 (return loss of the second power supply interface), and S12 (isolation of the second power supply interface to the first power supply interface).
In one possible design, the present embodiment describes the double-feed filter device in detail based on the above embodiment, for example, the embodiment described in fig. 2, in order to optimize the low-frequency impedance of the antenna and improve the antenna performance. The double-feed filter device may further comprise a low-frequency matching circuit.
The first feed interface is connected with the low-pass filter circuit through the low-frequency matching circuit; the low-frequency matching circuit is used for adjusting the low-frequency impedance of the external antenna.
In this embodiment, the low-frequency matching circuit can optimize the low-frequency impedance of the external antenna, and improve the performance of the antenna. The first feed interface 1 is connected with the low-pass filter circuit through the low-frequency matching circuit. Specifically, a first end of the low-frequency matching circuit is connected to the first feeding interface 1, a second end of the low-frequency matching circuit is connected to the low-pass filter circuit (i.e., a second end of the low-frequency matching circuit is connected to the first capacitor C1 in the low-pass filter circuit), and a third end of the low-frequency matching circuit is grounded.
In one possible design, referring to fig. 3, fig. 3 is a schematic structural diagram of a multiband antenna according to another embodiment of the present invention, where the low-frequency matching circuit is described in detail based on the above embodiment, for example, based on the embodiment shown in fig. 2. The low frequency matching circuit may include: a fourth inductance and a fourth capacitance.
The first feed interface is connected with one end of the fourth inductor, the other end of the fourth inductor is grounded through the fourth capacitor, and the other end of the fourth inductor is also connected with the low-pass filter circuit.
In this embodiment, one end of the fourth inductor L4 is a first end of the low-frequency matching circuit, the other end of the fourth inductor L4 and one end of the fourth capacitor C4 are both second ends of the low-frequency matching circuit, and the other end of the fourth capacitor C4 is a third end of the low-frequency matching circuit; the first feed interface 1 is connected with one end of a fourth inductor L4, the other end of the fourth inductor L4 is respectively connected with one end of a fourth capacitor C4 and one end of a first capacitor C1 in the low-pass filter circuit, and the other end of the fourth capacitor C4 is grounded. The low-pass matching circuit of the feed source provided by the first feed interface 1 after passing through the low-pass filter circuit can optimize the low-frequency impedance of the antenna and improve the performance of the antenna.
Illustratively, the fourth inductance L4 is 10n and the capacitance of the fourth capacitance C may be 2.5p.
In one possible design, the present embodiment describes the double-feed filter device in detail based on the above embodiment, for example, based on the embodiment described in fig. 2 or fig. 3, in order to optimize the high-frequency impedance in the antenna and improve the antenna performance. The double-fed filter device may further comprise a high-frequency matching circuit.
The second feed interface is connected with the low-pass filter circuit through the medium-high frequency matching circuit; the middle-high frequency matching circuit is used for adjusting the middle-high frequency impedance of the external antenna.
In the embodiment, the medium-high frequency matching circuit can optimize medium-high frequency impedance of the external antenna and improve the performance of the antenna. The second feed interface 2 is connected with the high-pass filter circuit through the medium-high frequency matching circuit. Specifically, the first end of the medium-high frequency matching circuit is connected with the second feed interface 2, the second end of the medium-high frequency matching circuit is connected with the high-pass filter circuit (i.e., the second end of the medium-high frequency matching circuit is connected with the second capacitor C2 in the high-pass filter circuit), and the third end of the medium-high frequency matching circuit is grounded.
In one possible design, referring to fig. 4, fig. 4 is a schematic structural diagram of a multiband antenna according to another embodiment of the present invention, where the mid-high frequency matching circuit is described in detail based on the above embodiment, for example, based on the embodiment shown in fig. 2. The medium-high frequency matching circuit may include: a fifth capacitance, a sixth capacitance, and a fifth inductance.
The second feed interface is respectively connected with one end of the sixth capacitor and one end of the fifth inductor through the fifth capacitor, the other end of the sixth capacitor is connected with the high-pass filter circuit, and the other end of the fifth inductor is grounded.
In this embodiment, one end of the fifth capacitor C5 is a first end of the medium-high frequency matching circuit, the other end of the sixth capacitor C6 is a second end of the medium-high frequency matching circuit, and the other end of the fifth inductor is a third end of the medium-high frequency matching circuit; the second feeding interface 2 is connected with one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is connected with one end of a sixth capacitor C6 and one end of a fifth inductor L5 respectively, the other end of the fifth inductor L5 is grounded, and the other end of the sixth capacitor C6 is connected with one end of a second capacitor C2 and one end of a third capacitor C3 in the high-pass filter circuit respectively. The medium-high pass matching circuit of the feed source provided by the second feed interface 2 after passing through the high pass filter circuit can optimize medium-high frequency impedance of the antenna and improve the performance of the antenna.
Illustratively, the capacitance of the fifth capacitor C5 may be 1.5p, the capacitance of the sixth capacitor C6 may be 0.5p, and the fifth inductance may be 8n.
In one possible design, referring to fig. 5, fig. 5 is a schematic structural diagram of a multiband antenna according to still another embodiment of the present invention, where the details of the double-feed filtering device are described based on the above embodiment, for example, based on the embodiment described in fig. 3 or fig. 4. The double-feed filter device can comprise a first feed interface, a second feed interface, a high-pass filter circuit, a low-frequency matching circuit and a medium-high frequency matching circuit.
The first feed interface is sequentially connected with the low-frequency matching circuit, the low-pass filter circuit, the high-pass filter circuit, the medium-high frequency matching circuit and the second feed interface.
Specifically, the first feeding interface 1 is connected with one end of a fourth inductor L4, the other end of the fourth inductor L4 is respectively connected with one end of a fourth capacitor C4 and one end of the first capacitor C1, and the other end of the fourth capacitor C4 is grounded; one end of the first capacitor C1 is connected with one end of the first inductor L1 and one end of the second inductor L2 respectively, the other end of the first inductor L1 is grounded, and the other end of the second inductor L2 is connected with the other end of the third capacitor C3; one end of the third capacitor C3 is respectively connected with one end of the second capacitor C2 and the other end of the sixth capacitor, and the other end of the second capacitor C2 is grounded through the third inductor; one end of the sixth capacitor is connected with the other end of the fifth capacitor C5 and one end of the fifth inductor respectively, the other end of the fifth inductor is grounded, and one end of the fifth capacitor C5 is connected with the second feed interface 2. Wherein, a port 3 is disposed at a position where the other end of the second inductor L2 is connected with the other end of the third capacitor C3, and parameters of the 3D simulation external antenna are imported through the port 3, equivalently, the port 3 is connected with the external antenna (i.e. the port 3 is connected with an input end of the antenna device, and an output end of the antenna device is connected with the external antenna).
In this embodiment, by adding S11 (return loss of the first feeding interface), S21 (isolation of the first feeding interface to the second feeding interface), S22 (return loss of the second feeding interface), S12 (isolation of the second feeding interface to the first feeding interface), the antenna resonance of the low frequency and the medium and high frequency is optimized, and the place where the isolation is worst is around 1.28Ghz, and the isolation of the low frequency 380 to 960Mhz is worst up to-23 dB; the worst isolation between 1447Mhz and 1467Mhz is-10 dB, and the worst isolation between 1710 and 2690Mhz is-18 dB. Thus, the antenna efficiency includes the filter circuit, the matched loss and the radiation loss of the antenna. The antenna is an external antenna, and is little influenced by the surrounding environment. By simulating the antenna shell, the antenna wire is coated with copper, the real situation is simulated, the result is close to real, and the accuracy is high. As a result of simulation, it was found that the antenna efficiency was about-5 dB (31%) or more for the 380-2490 Mhz, and about-6 dB (25%) for the 2490-2690 Mhz.
Therefore, by the scheme of the terminal electronic equipment provided with the matching circuit, the filter circuit and the doubly-fed excited external antenna radiator, the isolation degree of the doubly-fed port is increased by utilizing the low-pass filter circuit and the high-pass filter circuit, so that after doubly-fed excited the same external antenna radiator, low-frequency signals (380-960 Mhz) enter the antenna through the low-pass filter circuit, and medium-high-frequency channels (1447 MHz-2690 Mhz) enter the antenna through the high-pass filter circuit. The low-pass high-pass filter circuit can solve the problem that the two feed points are coupled with the same radiator antenna and the 2 feed points are coupled seriously. The low-frequency matching circuit and the medium-high frequency matching circuit are respectively added behind the low-pass filter circuit, so that the full-band bandwidth of the external antenna is realized, the scheme of the external antenna covering the full-band bandwidths of 380-960 Mhz and 1447-2690 Mhz is realized, and a series of problems that the bandwidth is insufficient, the matching circuit only can focus on low frequency or high frequency, switching loss, switching overvoltage risk, low space utilization rate and the like in the prior art are solved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A multi-band antenna, comprising: an antenna device and a double-feed filter device; the antenna device is connected with the double-fed filtering device;
the double-feed filter device is used for doubly exciting the same radiator of the antenna device, so that signals in different frequency bands passing through the double-feed filter device enter the antenna device;
the antenna device is provided with an external antenna;
the double-fed filter device comprises a first feed interface, a second feed interface, a high-pass filter circuit and a low-pass filter circuit;
the first feed interface is respectively connected with the low-pass filter circuit, the high-pass filter circuit and the second feed interface in sequence;
the output end of the low-pass filter circuit and the output end of the high-pass filter circuit are the output ends of the double-feed filter device, and the output ends of the double-feed filter device are connected with the external antenna;
the first feed interface and the second feed interface are both used for providing a signal source for exciting the external antenna, the low-pass filter circuit is used for filtering medium-high frequency signals so that signals passing through the low-pass filter circuit enter the external antenna, the high-pass filter circuit is used for filtering low-frequency signals so that signals passing through the high-pass filter circuit enter the external antenna, and the low-pass filter circuit and the high-pass filter circuit both receive signals of various frequency bands;
the double-feed filter device is used for doubly exciting the same radiator of the external antenna;
the external antenna has a topology structure, and the topology structure is determined by adjusting a coverage frequency band of the external antenna.
2. The multiband antenna according to claim 1, wherein the antenna device is further provided with a circuit board;
the external antenna and the double-fed filter device are both arranged on a circuit board, and the external antenna is connected with the double-fed filter device;
the external antenna is used for receiving the bandwidth signals of multiple frequency bands passing through the double-fed filter device.
3. The multiband antenna according to claim 1, wherein the low-pass filter circuit comprises a first capacitor, a first inductance and a second inductance;
the first feed interface is respectively connected with one end of the first capacitor and one end of the second inductor, the other end of the first capacitor is grounded through the first inductor, the other end of the second inductor is connected with the second feed interface through the high-pass filter circuit, and the other end of the second inductor is also connected with the external antenna;
the resistance value of the first inductor is larger than that of the second inductor.
4. The multiband antenna according to claim 1, wherein the high-pass filter circuit includes a second capacitor, a third capacitor, and a third inductor;
the second feed interface is respectively connected with one end of the second capacitor and one end of the third capacitor, the other end of the second capacitor is grounded through the third inductor, the other end of the third capacitor is connected with the first feed interface through the low-pass filter circuit, and the other end of the third capacitor is also connected with the external antenna;
wherein the capacitance of the second capacitor is larger than the capacitance of the third capacitor.
5. The multiband antenna according to any one of claims 1-4, wherein said double-fed filtering means further comprises a low-frequency matching circuit;
the first feed interface is connected with the low-pass filter circuit through the low-frequency matching circuit;
the low-frequency matching circuit is used for adjusting the low-frequency impedance of the external antenna.
6. The multiband antenna according to claim 5, wherein the low-frequency matching circuit includes: a fourth inductance and a fourth capacitance;
the first feed interface is connected with one end of the fourth inductor, the other end of the fourth inductor is grounded through the fourth capacitor, and the other end of the fourth inductor is also connected with the low-pass filter circuit.
7. The multiband antenna according to claim 5, wherein the double-fed filtering means further comprises a medium-high frequency matching circuit;
the second feed interface is connected with the low-pass filter circuit through the medium-high frequency matching circuit;
the middle-high frequency matching circuit is used for adjusting the middle-high frequency impedance of the external antenna.
8. The multiband antenna according to claim 7, wherein the medium-high frequency matching circuit includes: a fifth capacitor, a sixth capacitor and a fifth inductor;
the second feed interface is respectively connected with one end of the sixth capacitor and one end of the fifth inductor through the fifth capacitor, the other end of the sixth capacitor is connected with the high-pass filter circuit, and the other end of the fifth inductor is grounded.
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