CN114069227A - Multi-band antenna - Google Patents
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- CN114069227A CN114069227A CN202010747629.8A CN202010747629A CN114069227A CN 114069227 A CN114069227 A CN 114069227A CN 202010747629 A CN202010747629 A CN 202010747629A CN 114069227 A CN114069227 A CN 114069227A
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- 230000005284 excitation Effects 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 114
- 238000001914 filtration Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 description 20
- 238000002955 isolation Methods 0.000 description 13
- 230000008878 coupling Effects 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 6
- 230000005404 monopole Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
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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-fed filter device; the antenna device is connected with the double-fed filter device; the double-fed filter device is used for double-fed excitation of the same radiator of the antenna device, so that signals passing through different frequency bands of the double-fed 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 is used for effectively transmitting and receiving radio frequency signals, the resonant branches of the antenna have frequency bandwidth, and the requirement on the coverage bandwidth of the antenna is higher along with the development of communication.
At present, the coverage of bandwidth is realized by arranging an external antenna or an internal antenna, but the coverage of bandwidth is not enough, which is not enough to meet the requirement of more frequency bands.
Disclosure of Invention
The embodiment of the invention provides a multi-band antenna which can increase the 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 filter device;
the double-fed filter device is used for double-fed excitation of the same radiator of the antenna device, so that signals passing through different frequency bands of the double-fed 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 multi-band bandwidth signals passing through the double-fed filter device.
In one possible design, the double-fed filter device includes a first feeding interface, a second feeding 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-fed filter device, and the output end of the double-fed filter device is connected with the external antenna;
the first feed interface and the second feed interface are 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 the 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 the signals passing through the high-pass filter circuit enter the external antenna;
the double-fed filter device is used for double-fed excitation of 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 greater than the capacitance of the third capacitor.
In one possible design, the double-fed filter device 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.
In one possible design, the low frequency matching circuit includes: a fourth inductor and a fourth capacitor;
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 further connected with the low-pass filter circuit.
In one possible design, the double-fed filter 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 medium-high frequency matching circuit is used for adjusting medium-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, and the topology is determined by adjusting a coverage frequency band of the external antenna.
The multiband antenna provided by the embodiment is provided with the antenna device and the double-fed filter device, wherein the antenna device is connected with the double-fed filter device, and can perform double-fed excitation through the double-fed filter device, so that signals of different frequency bands of the double-fed filter device enter the antenna device, the coverage bandwidth is increased, the coverage of multiband bandwidth is realized, and meanwhile, because the double-fed excitation of the same radiator can solve the mutual coupling problem between double feeds through the double-fed filter device, the space utilization rate is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a scene of a multiband antenna provided in 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 still 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 still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Currently, coverage of a certain frequency band bandwidth is realized by using an external antenna and an internal antenna, for example: the external antenna is provided with only one feed, and only the 1/4 lambda, 3/4 lambda, 5/4 lambda, 7/4 lambda and other frequency-doubled resonances of the monopole are utilized, but the bandwidth is not enough to meet the requirements of 380 Mhz-960 Mhz and 1447-2690 Mhz full frequency band; or the external antenna is additionally provided with additional branches on the monopole to realize other resonances, but the bandwidth is not enough to meet the requirements of 380 Mhz-960 Mhz and 1447-2690 Mhz full frequency band; or a built-in antenna is arranged, double feed switching is carried out through a switch, the influence of the head and the hands is improved, but switching is carried out through a tuning switch, so that switching loss is easily introduced, and in addition, the risk of switch overvoltage is caused; or the built-in double-fed antenna excites 2 different radiators, but the radiators are connected, and the coupling between 2 feed points is reduced by isolating, but the utilization degree of space is still not high enough because of the grounding structure. Therefore, the prior art has a series of problems of insufficient bandwidth, switching loss, switching overvoltage, low space utilization rate and the like.
In order to solve the above problems, the technical idea of the present invention is to utilize the same radiator of the dual-fed excited external antenna, for example, the mutual coupling problem between the dual feeds can be solved by a low-pass filter circuit and a high-pass filter circuit, and the antenna performance is improved without the need of isolation.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic view of a scene of a multiband antenna according to an embodiment of the present invention. A multiband antenna comprising: and the antenna device is connected with the double-fed filter device.
The double-fed filter device is used for doubly-fed excitation of the same radiator (shown in fig. 1) of the antenna device, so that signals passing through different frequency bands of the double-fed 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 includes an external antenna 20 and a circuit board 10.
In this embodiment, the problem of serious coupling of 2 feed ports of the double-feed point same radiator antenna can be solved by using the double-feed filter device, so that signals passing through different frequency bands of the double-feed filter device enter the antenna device, and an external antenna covering 380-960 Mhz and 1447-2690 Mhz full frequency bands is realized.
The multiband antenna provided by the embodiment is provided with the antenna device and the double-fed filter device, wherein the antenna device is connected with the double-fed filter device, and can perform double-fed excitation through the double-fed filter device, so that signals of different frequency bands of the double-fed filter device enter the antenna device, the coverage bandwidth is increased, the coverage of multiband bandwidth is realized, and meanwhile, because the double-fed excitation of the same radiator can solve the mutual coupling problem between double feeds through the double-fed filter device, the space utilization rate is higher.
In a possible design, the present embodiment provides an external antenna and a circuit board for the antenna device on the basis of the above embodiments.
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 multi-band bandwidth signals 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 + multi-branch can increase the coverage bandwidth. The sum of the antenna topology and the terminal in the external antenna topology is 96 mm. Wherein the length of the external antenna is related to adjusting the low frequency.
Specifically, the external antenna and the dual-feed 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 the distributed current is small, such as a position on the PCB where a narrow edge is close to a corner, so that the current on the circuit board can excite the resonant mode of the external antenna well; the current distribution on the circuit boards with different frequencies is different, so that the external antenna is placed according to a specific current distribution scene. The signal source on the PCB board can provide a signal to excite the external antenna and can also provide a double-fed filter device, namely the double-fed filter device is arranged on the circuit board. In addition, the PCB board can help the external antenna to radiate at a low frequency, can be understood as a part of the external antenna, and can be equivalent to a dipole antenna.
The antenna device can comprise an input end and an output end, and the PCB is connected with the input end and the external antenna through the output end. The external antenna with the topological structure can receive bandwidth signals of multiple frequency bands passing through the double-fed filter device.
In one possible design, the external antenna has a topology, and the topology is determined by adjusting a 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, wherein the antenna topology can generate more resonances, can cover multiple frequency band bandwidth signals as much as possible, realizes full-band coverage, and meets the requirements of 380Mhz to 960Mhz, 1447 to 2690Mhz full-band. The external antenna is different in required coverage bandwidth, and the topological structures can be different, so that the design of the antenna topology is required according to a specific scene to increase the coverage bandwidth.
In a 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 present embodiment describes a doubly-fed filter apparatus in detail based on the above embodiment. 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 end of the double-fed filter device, and the output end of the double-fed filter device is connected with the external antenna.
The first feed interface and the second feed interface are 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 the 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 the signals passing through the high-pass filter circuit enter the external antenna.
In addition, the double-fed filter device is used for double-fed excitation of the same radiator of the external antenna.
In this embodiment, the double-fed filter device includes a double-fed filter circuit, that is, a high-pass filter circuit and a low-pass filter circuit, and the double-fed filter circuit is disposed on the circuit board. The circuit board is further provided with at least two feed interfaces, namely a first feed interface 1 and a second feed interface 2, for providing a feed source to excite the external antenna, wherein the feed source can be provided by the circuit board or other equipment.
The feed source (signal source) provided by the first feed interface only allows low-frequency signals to enter through the low-pass filter circuit, wherein the first feed interface can be used for providing the low-frequency signals; a feed source (signal source) provided by a second feed interface only allows medium-high frequency signals to enter through a high-pass filter circuit, wherein the second feed interface can be used for providing the medium-high frequency signals; in addition, the frequency bands can be not distinguished, signals of each frequency band 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 similarly, when the signals pass through the high-pass filter circuit, only medium-high frequency signals can enter the external antenna.
Specifically, the double-fed filter device can excite the same radiator of the external antenna through the active matching network by using two feed sources, so that the serious problem of coupling of 2 feed ports is solved, after the same radiator of the external antenna is excited by double feeding, a low-frequency signal (380-960 Mhz) enters the antenna through the low-pass filter circuit, and a medium-high frequency channel (1447 Mhz-2690 Mhz) enters the antenna through the high-pass filter circuit, namely, 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-fed filter device). The port 3 introduces parameters of the 3D simulation external antenna, and can be equivalently connected with the input end of the antenna device, that is, the external antenna.
Therefore, the isolation degree of the double-fed electric port is increased by utilizing the low-pass filter circuit and the high-pass filter circuit, so that the same radiator of the double-fed electric excitation external antenna can solve the serious problem of the double-fed same radiator antenna and the serious coupling of 2 feed point ports. Meanwhile, the problem that when one feed interface in the prior art is used, low frequency or high frequency is biased, if low frequency matching is selected, the high frequency is easily filtered, performance is reduced, and double resonance in a certain frequency band is intelligently achieved.
In a possible design, referring to the low-pass filter circuit in fig. 2, the present embodiment describes the low-pass filter circuit in detail on the basis of the above-mentioned 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 further connected with the external antenna. The resistance value 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, wherein the first capacitor C1 is connected in series with the first inductor L1, 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 inductor L1 is grounded, and the other end of the second inductor is connected to 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.
For example, the first inductor L1 may be 47n (i.e., 47 nanohenries), the first capacitor C1 may have a capacitance of 8p (i.e., 8 picofarads), and the second inductor may be 22 n.
In a possible design, referring to the high-pass filter circuit in fig. 2, the present embodiment describes the high-pass filter circuit in detail on the basis of the above-mentioned embodiments. 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 that of the third capacitor.
In this embodiment, the high-pass filter circuit is composed of a second capacitor C2, a third capacitor C2, 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 to one end of the second feeding interface 2 and one end of the third capacitor C3, the other end of the third inductor L3 is grounded, and the other end of the third capacitor C3 is connected to the first feeding interface 1 through the low-pass filter circuit. And the other end of the third capacitor can be connected with an external antenna. And the medium-high frequency signal enters the external antenna through the high-pass filter circuit.
For example, the capacitance of the second capacitor C2 may be 15p, the capacitance of the third capacitor C3 may be 0.5p, and the capacitance of the third inductor may be 12 n.
Specifically, as shown in fig. 2, the first feeding interface 1 is disposed at the 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 the 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 feed 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 the second feed interface 2, and the other end of the second capacitor C2 is grounded through the third inductor L3. A port 3 is arranged at a position where the other end of the second inductor L2 is connected with the other end of the third capacitor C3, and the port 3 is used for introducing parameters of the 3D simulation external antenna, and equivalently connecting the parameters with the external antenna through the port 3 (namely connecting the port 3 with the input end of the antenna device, and connecting the output end of the antenna device with the external antenna).
Therefore, by utilizing the double-fed filter device, low-frequency signals pass through the low-pass filter circuit, medium-high frequency signals pass through the medium-high pass filter circuit, and the isolation degree among 2 feed ports is increased, so that the same radiator of the external antenna is electrically excited by double feeding, after the same radiator of the external antenna is excited by double feeding, 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, so that the problem of serious coupling of 2 feed point ports of the same radiator of double feeding can be solved, and 380-960 Mhz and 1447-2690 Mhz full frequency bands can be covered. If the multi-band antenna is not provided with a double-fed filter circuit, through simulation, the S parameters corresponding to the two feeding ports can obtain that the antenna resonance is shallow, the isolation degree from 380Mhz to 2690Mhz is not good, and the two feeding ports are serious in coupling, so that the full-band coverage of 380 to 960Mhz and 1447 to 2690Mhz cannot be met. Among them, the S parameters may include S11 (return loss of the first feed interface), S21 (isolation of the first feed interface to the second feed interface), S22 (return loss of the second feed interface), and S12 (isolation of the second feed interface to the first feed interface).
In a possible design, in order to optimize the low-frequency impedance of the antenna and improve the performance of the antenna, the present embodiment details the double-fed filter device on the basis of the above-mentioned embodiment, for example, on the basis of the embodiment described in fig. 2. The double-fed filter device can also 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 external antenna low frequency impedance, promotes the antenna performance. Wherein the first feeding interface 1 is connected to the low-pass filter circuit via 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., the 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 a possible design, referring to fig. 3, fig. 3 is a schematic structural diagram of a multiband antenna according to still another embodiment of the present invention, and this embodiment describes details of a low frequency matching circuit based on the above-mentioned embodiment, for example, based on the embodiment shown in fig. 2. The low frequency matching circuit may include: a fourth inductor and a fourth capacitor.
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 further 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 to one end of a fourth inductor L4, the other end of the fourth inductor L4 is connected to 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 feed source provided by the first feed interface 1 can optimize the low-frequency impedance of the antenna through the low-pass matching circuit behind the low-pass filter circuit, and the performance of the antenna is improved.
Illustratively, the fourth inductor L4 is 10n, and the capacitance of the fourth capacitor C may be 2.5 p.
In a possible design, in order to optimize the high-frequency impedance in the antenna and improve the performance of the antenna, the present embodiment describes the doubly-fed filter apparatus in detail on the basis of the above embodiments, for example, on the basis of the embodiments described in fig. 2 or fig. 3. The double-fed filter device can also 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 medium-high frequency matching circuit is used for adjusting medium-high frequency impedance of the external antenna.
In this embodiment, the medium-high frequency matching circuit can optimize the medium-high frequency impedance of the external antenna, and improve the antenna performance. Wherein the second feed interface 2 is connected to the high-pass filter circuit via the medium-high frequency matching circuit. Specifically, a first end of the medium-high frequency matching circuit is connected to the second feed interface 2, a second end of the medium-high frequency matching circuit is connected to the high-pass filter circuit (i.e., a second end of the medium-high frequency matching circuit is connected to the second capacitor C2 in the high-pass filter circuit), and a third end of the medium-high frequency matching circuit is grounded.
In a 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, and this embodiment describes in detail the middle-high frequency matching circuit based on the above-mentioned embodiment, for example, based on the embodiment shown in fig. 2. The medium-high frequency matching circuit may include: 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 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 feed interface 2 is connected to one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is connected to 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 to one end of a second capacitor C2 and one end of a third capacitor C3 in the high-pass filter circuit, respectively. The feed source provided by the second feed interface 2 can optimize the high-frequency impedance in the antenna through the medium-high pass matching circuit after passing through the high-pass filter circuit, and the performance of the antenna is improved.
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 capacitance of the fifth inductor may be 8 n.
In a 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, and this embodiment describes in detail a doubly-fed filter apparatus based on the above-mentioned embodiment, for example, based on the embodiment described in fig. 3 or fig. 4. The double-fed 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 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 in sequence.
Specifically, the first feeding interface 1 is connected to one end of a fourth inductor L4, the other end of the fourth inductor L4 is connected to one end of a fourth capacitor C4 and one end of a first capacitor C1, respectively, and the other end of the fourth capacitor C4 is grounded; one end of the first capacitor C1 is connected to 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 to the other end of the third capacitor C3; one end of a 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 to 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 to the second feed interface 2. A port 3 is arranged at a position where the other end of the second inductor L2 is connected with the other end of the third capacitor C3, and the port 3 is used for introducing parameters of the 3D simulation external antenna, and equivalently connecting the parameters with the external antenna through the port 3 (namely connecting the port 3 with the input end of the antenna device, and connecting the output end of the antenna device with the external antenna).
In the embodiment, by adding the filter circuit (high-pass filter circuit, low-pass filter circuit) and the matching circuit (low-frequency matching circuit, medium-high frequency matching circuit) to S11 (return loss of the first feed interface), S21 (isolation from the first feed interface to the second feed interface), S22 (return loss of the second feed interface), and S12 (isolation from the second feed interface to the first feed interface), the resonance of the low-frequency and medium-high frequency antennas is optimized, the worst isolation is near 1.28Ghz, and the worst isolation of 380-960 Mhz can reach-23 dB; the worst isolation between 1447Mhz and 1467Mhz is-10 dB, and the worst isolation between 1710 Mhz and 2690Mhz is-18 dB. Thus, the antenna efficiency, including the filter circuit, matching losses and the radiation losses of the antenna. Because the antenna is external, the influence of the surrounding environment is small. Through the simulation of the antenna shell, the antenna wires are covered with copper, the real situation is simulated, the result is close to the real, and the accuracy is high. Simulation results show that the antenna efficiency of 380-2490 Mhz can reach more than-5 dB (31%), and the antenna efficiency of 2490-2690 Mhz can reach about-6 dB (25%).
Therefore, by setting a scheme of terminal electronic equipment comprising a matching circuit, a filter circuit and a double-fed excitation external antenna radiator, the isolation degree of a double-fed electric port is increased by utilizing a low-pass filter circuit and a high-pass filter circuit, so that the same radiator of the double-fed electric excitation external antenna is excited, after the same radiator of the double-fed electric excitation external antenna is excited, a low-frequency signal (380-960 Mhz) enters the antenna through the low-pass filter circuit, and a medium-frequency channel (1447 MHz-2690 Mhz) enters the antenna through the high-pass filter circuit. Through the low-pass high-pass filter circuit, the problem that the coupling of 2 feed point ports is serious in the double-feed point same radiator antenna can be solved. And a low-frequency matching circuit and a middle-high frequency matching circuit are respectively added behind the low-pass filter circuit and the high-pass filter circuit, so that the full band width of the external antenna is realized, the external antenna scheme covering 380-960 Mhz and 1447-2690 Mhz full band is realized, and a series of problems that the bandwidth is insufficient, the matching circuit can only emphasize low frequency or high frequency, the switching loss, the switch overvoltage risk, the space utilization rate is low and the like in the prior art are solved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A multiband antenna, comprising: an antenna device and a double-feed filter device; the antenna device is connected with the double-fed filter device;
the double-fed filter device is used for double-fed excitation of the same radiator of the antenna device, so that signals passing through different frequency bands of the double-fed filter device enter the antenna device.
2. The multiband antenna of claim 1, wherein 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 multi-band bandwidth signals passing through the double-fed filter device.
3. The multiband antenna of claim 2, wherein the doubly-fed filtering means 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-fed filter device, and the output end of the double-fed filter device is connected with the external antenna;
the first feed interface and the second feed interface are 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 the 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 the signals passing through the high-pass filter circuit enter the external antenna;
the double-fed filter device is used for double-fed excitation of the same radiator of the external antenna.
4. The multiband antenna of claim 3, wherein 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 value of the first inductor is larger than that of the second inductor.
5. The multiband antenna of claim 3, wherein 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;
wherein the capacitance of the second capacitor is greater than the capacitance of the third capacitor.
6. The multiband antenna of any one of claims 3 to 5, wherein the doubly fed filter 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.
7. The multiband antenna of claim 6, wherein the low frequency matching circuit comprises: a fourth inductor and a fourth capacitor;
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 further connected with the low-pass filter circuit.
8. The multiband antenna of claim 6, wherein the doubly-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 medium-high frequency matching circuit is used for adjusting medium-high frequency impedance of the external antenna.
9. The multiband antenna of claim 8, wherein the medium-high frequency matching circuit comprises: 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.
10. The multiband antenna of claim 2, wherein the external antenna has a topology, the topology being determined by adjusting a coverage band of the external antenna.
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| CN114069227B (en) | 2024-02-13 |
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