CN109449611B - Parasitic monopole multi-frequency adjustable-frequency antenna system - Google Patents
Parasitic monopole multi-frequency adjustable-frequency antenna system Download PDFInfo
- Publication number
- CN109449611B CN109449611B CN201811295019.8A CN201811295019A CN109449611B CN 109449611 B CN109449611 B CN 109449611B CN 201811295019 A CN201811295019 A CN 201811295019A CN 109449611 B CN109449611 B CN 109449611B
- Authority
- CN
- China
- Prior art keywords
- antenna
- frequency
- low
- substrate
- tuner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
-
- 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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
-
- 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
Abstract
The invention provides a parasitic monopole multi-frequency adjustable-frequency antenna system, which comprises a substrate, a high-frequency antenna, an antenna tuner and a low-frequency antenna. The high-frequency antenna and a signal source are arranged on the substrate, the high-frequency antenna is provided with a first connecting end, the first connecting end is electrically coupled with the signal source, and the high-frequency antenna works in a first frequency band. The antenna tuner and the low-frequency antenna are arranged on the substrate, and the low-frequency antenna is provided with a second connecting end which is electrically coupled with the antenna tuner. The antenna tuner is used for adjusting the load of the low-frequency antenna. The low-frequency antenna generates resonance with the signal source through the substrate and works in a second frequency band through the antenna tuner. The invention has the advantages of independent adjustment of high and low frequency antenna frequency, low degree of frequency interference, high design elasticity, low cost and wide coverage frequency band, thereby promoting the realization of the miniaturization of wireless communication equipment.
Description
Technical Field
The invention relates to a frequency-adjustable antenna system, in particular to a parasitic monopole multi-frequency-adjustable antenna system with a low-frequency antenna independent of a high-frequency antenna.
Background
The antenna device is an essential component of a wireless communication device. Due to the rapid development of wireless technology, many wireless communication devices are required to be designed to cover multiple frequency bands. As wireless communication devices also require miniaturization, the space available for antennas within the devices is also limited. Generally, a clearance area is reserved on the circuit board to dispose the antenna, so as to prevent electromagnetic waves of other electronic components from affecting the efficiency of the antenna.
The most common prior art is to design a PIFA-type antenna (Planar Inverted-FAntenna) on a circuit board, such as the high-pass published PIFA round-antenna, where the antenna extends from a signal source to a clear area and extends to two ends, which can be regarded as a high-frequency antenna and a low-frequency antenna, respectively. However, the low frequency band needs to be expanded by the antenna tuner, and the adjustment of the low frequency band will affect the high frequency band to leave the desired range. Or the position of the antenna tuner needs to be matched with the high-frequency voltage zero point of the antenna, so that the antenna and the circuit board need to be designed by being matched with the position of the antenna tuner, the overall configuration elasticity is reduced, and the miniaturization difficulty of the equipment is increased.
In a chinese patent publication No. CN105284004, a mobile antenna is disclosed, which includes a tuning branch, a monopole high frequency antenna, and a monopole low frequency antenna, and the tuning branch of the high and low frequency antennas is linked to adjust the frequency bands of the high and low frequencies, however, the high and low frequency antennas respectively need a signal source to control the high and low frequency antennas, which is high in space consumption and cost. Moreover, the adjustment range of the frequency bands of the high frequency and the low frequency is limited.
It follows that the disadvantages of the prior art antenna systems include: it is difficult to take into account the bandwidth and transmission quality of multiple frequency bands, the cost is too high, and the miniaturization of the device design is difficult.
Disclosure of Invention
In view of the above, the present invention provides a parasitic monopole multi-frequency tunable antenna system, which has independent high-frequency and parasitic low-frequency antennas, adjusts a frequency band of a low frequency without interfering with a high frequency, and utilizes an antenna tuner directly connected to a ground terminal of a circuit board to facilitate signal configuration, and has excellent flexibility in circuit board assembly configuration.
The parasitic monopole multi-frequency tunable antenna system provided by the invention comprises a substrate, a signal source, a high-frequency antenna, a first antenna tuner and a low-frequency antenna. The signal source is arranged on the substrate. The high-frequency antenna is arranged on the substrate and is provided with a first connecting end, the first connecting end is positioned on the substrate and is electrically coupled with the signal source, and the high-frequency antenna works in a first frequency band. The first antenna tuner is disposed on the substrate and used for adjusting a load. The low-frequency antenna is arranged on the substrate and is provided with a second connecting end, the second connecting end is positioned on the substrate, and the second connecting end is electrically coupled with the first antenna tuner. The low-frequency antenna resonates with the signal source and the substrate and works in a second frequency band through the first antenna tuner.
The parasitic monopole multi-frequency tunable antenna system further comprises a processor coupled to the first antenna tuner for controlling the first antenna tuner to adjust the load.
Wherein the length of the low frequency antenna is longer than the length of the high frequency antenna.
There is no direct coupling between the high frequency antenna and the low frequency antenna of the parasitic monopole multi-frequency tunable antenna system.
Furthermore, a shortest distance is formed between the high-frequency antenna and the low-frequency antenna, and the shortest distance is larger than 2 mm.
Wherein the first antenna tuner further comprises a switching circuit and a plurality of loads, the switching circuit is electrically coupled with the processor and the loads, and the switching circuit is controlled by the processor to switch the loads.
Further, the load comprises a wire, an inductor, a resistor and a capacitor.
The second frequency band in the parasitic monopole multi-frequency tunable antenna system is a bandwidth with return loss less than-6 dB, and the bandwidth covered by the second frequency band is more than 200MHz through the adjustment of the first antenna tuner. In particular, the second frequency band covers a bandwidth greater than 260 MHz.
Wherein the second frequency band covers 0.70GHz to 0.96 GHz.
The first frequency band in the parasitic monopole multi-frequency tunable antenna system refers to a bandwidth with return loss less than-6 dB, and the bandwidth covered by the first frequency band is greater than 700 MHz.
Wherein the first frequency band covers 1.70GHz to 2.40 GHz.
The parasitic monopole multi-frequency tunable antenna system further comprises a second antenna tuner and a third antenna. The second antenna tuner is disposed on the substrate and used for adjusting the load. The third antenna is arranged on the substrate. The third antenna has a third connection end located on the substrate and electrically coupled to the second antenna tuner. The third antenna resonates with the signal source and the substrate and operates in a third frequency band through the second antenna tuner.
There is no direct coupling between the third antenna and the high frequency antenna or the low frequency antenna.
In summary, the parasitic monopole multi-frequency tunable antenna system of the present invention employs a low-cost parasitic antenna and the antenna tuner is directly disposed in the circuit board area, so that the low-frequency antenna can independently adjust the frequency band, and interfere with the frequency band of the high-frequency antenna to a very low degree, and both have a certain radio frequency quality, and therefore the high-frequency and low-frequency antennas can cover a wider bandwidth. In addition, the highest limit on the interval of the high-frequency and low-frequency antennas can be reduced through a resonance mode formed by the circuit board, and the high-frequency and low-frequency antennas can realize high elasticity design, so that the miniaturization of the wireless communication equipment is promoted.
Drawings
Fig. 1 is a schematic diagram of a parasitic monopole multi-band tunable antenna system according to an embodiment of the invention.
Fig. 2 is a detailed schematic diagram of the antenna tuner of fig. 1.
Fig. 3 is a schematic diagram of a parasitic monopole multi-frequency tunable antenna system according to another embodiment of the invention.
Fig. 4 is a schematic diagram of a parasitic monopole multi-frequency tunable antenna system according to an embodiment of the invention.
Fig. 5 is a schematic diagram of a parasitic monopole multi-frequency tunable antenna system according to another embodiment of the present invention.
Fig. 6A is a return loss diagram of the parasitic monopole multi-band tunable antenna system of fig. 1 in a frequency band actually verified.
Fig. 6B is a plot of band efficiency for the actual verification of fig. 6A.
Fig. 7 is a schematic diagram of a parasitic monopole multi-frequency tunable antenna system according to another embodiment of the invention.
Reference numerals:
1: substrate 100: parasitic monopole multi-frequency adjustable-frequency antenna system
5: the processor 211: first connecting end
10: the headroom area 312: second connecting end
20: signal source 333: change-over switch
21: the high-frequency antenna 351: 8nH inductor
25: the matching component 352: 4nH inductor
31: low-frequency antenna 353: transmission line
33: first antenna tuner 354: 4pF capacitor
41: third antenna 413: third connecting end
43: second antenna tuners 611 to 614: return loss curve
51: control signal lines 621 to 624: curve of efficiency values
52: control signal line S: shortest distance
Detailed Description
In order that the advantages, spirit and features of the invention will be readily understood and appreciated, embodiments thereof will be described and discussed with reference to the accompanying drawings. It is to be understood that these embodiments are merely representative examples of the present invention, and that no limitation on the scope of the invention or its corresponding embodiments is intended by the specific methods, devices, conditions, materials, etc., illustrated herein.
Reference throughout this specification to the description of "a particular embodiment," "another particular embodiment," or "some embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal, lateral, upper, lower, front, rear, left, right, top, bottom, inner, outer" and the like refer to orientations or positional relationships based on those shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referenced device or assembly must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
The terms "coupled," "coupled," and "electrically coupled" in this specification mean that the two are directly or indirectly connected. A direct connection may be an electrical direct connection, and an indirect connection may be a connection between the two with a load or component. On the other hand, the term "without direct coupling" means that there is no contact between the two or no electrical connection, but there may be a structural connection or there may be a transfer of electromagnetic energy.
Please refer to fig. 1. Fig. 1 is a schematic diagram of a parasitic monopole multi-band tunable antenna system 100 according to an embodiment of the invention. As shown in fig. 1, the parasitic monopole multi-frequency tunable antenna system 100 includes a substrate 1, a signal source 20, a high-frequency antenna 21, a first antenna tuner 33, and a low-frequency antenna 31. The signal source 20 is disposed on the substrate 1. The high frequency antenna 21 is disposed on the substrate 1 and has a first connection end 211, and the first connection end 211 is located on the substrate 1 and electrically coupled to the signal source 20. The high frequency antenna 21 operates in a first frequency band. The first antenna tuner 33 is disposed on the substrate 1 and used for adjusting a load. The low frequency antenna 31 is disposed on the substrate 1, and the low frequency antenna 31 has a second connection end 312, and the second connection end 312 is disposed on the substrate 1 and electrically coupled to the first antenna tuner 33. The low frequency antenna 31 resonates with the signal source 20 through the substrate 1 and operates in a second frequency band through the first antenna tuner 33. In this embodiment, the high frequency antenna 21 is not in direct contact with or connected to the low frequency antenna 31.
Generally, the desired frequency band of a high frequency antenna is easier to satisfy, and in today's more limited electronic environment, a low frequency antenna typically has a transmission frequency band that covers only 1/3 of the desired frequency band. Therefore, in the design of the invention, when the frequency band of the low frequency is adjusted, the adjustment is not needed together with the high frequency band. And the low frequency band after adjustment does not interfere with the high frequency band. The antenna tuner 33 is directly disposed on the second connection end 312 of the low-frequency antenna 31, and does not need to be matched with the high-frequency voltage zero point of the antenna, so that the circuit design is more flexible, and the miniaturization mechanism design is facilitated.
Wherein the length of the low frequency antenna 31 is longer than the length of the high frequency antenna 21. The adjustable frequency band range of the antenna is determined by the length of the antenna. The frequency band of the antenna is easier to design than in the prior art. The substrate may include a PCB circuit board.
The parasitic monopole multi-frequency tunable antenna system 100 may further include a matching element 25, the matching element 25 is coupled between the high-frequency antenna 21 and the signal source 20, and the high-frequency antenna 21 is tuned to the first frequency band by the matching element 25. Thus, the first frequency band in which the high frequency antenna 21 operates can be independently adjusted, and the second frequency band in which the low frequency antenna 31 operates can be independently adjusted, and the adjustment ranges of both can be extended.
Please refer to fig. 1 and fig. 2. Fig. 2 is a detailed schematic diagram of the antenna tuner 33 of fig. 1. The parasitic monopole multi-frequency tunable antenna system 100 further includes a processor 5 coupled to the first antenna tuner 33 for controlling the first antenna tuner 33 to adjust the load. Further, the load includes a conductive line, an inductor, a resistor, a capacitor, and the like. The processor 5 may control the switch 333 of the first antenna tuner 33 to switch on one of the low frequency antenna 31 and the aforementioned load, and the low frequency antenna 31 may change its first frequency band due to the change of the load.
In one embodiment, the processor 5 is electrically connected to the first antenna tuner 33 through the control signal line 51 and the control signal line 52, and the processor 5 can send a low voltage signal and a high voltage signal through the control signal line 51, and similarly, the processor 5 can send a low voltage signal and a high voltage signal through the control signal line 52. The first antenna tuner 33 can receive four combinations of signals from the two signal lines, and then control the switch 333 to switch to different loads. In practice, the four combinations of the above-mentioned control switch 333 will be described later.
When the control signal line 51 transmits the low voltage signal (L) and the control signal line 52 transmits the low voltage signal (L), the switch 333 of the first antenna tuner 33 turns on the low frequency antenna 31 and the 8nH inductor 351.
When the control signal line 51 transmits the high voltage signal (H) and the control signal line 52 transmits the low voltage signal (L), the switch 333 of the first antenna tuner 33 turns on the low frequency antenna 31 and the 4nH inductor 352.
When the control signal line 51 transmits the low voltage signal (L) and the control signal line 52 transmits the high voltage signal (H), the switch 333 of the first antenna tuner 33 turns on the low frequency antenna 31 and the transmission line 353, so that the low frequency antenna 31 is directly grounded.
When control signal line 51 transmits the high voltage signal (H) and control signal line 52 transmits the high voltage signal (H), switch 333 of first antenna tuner 33 turns on low frequency antenna 31 and 4pF capacitor 354.
In other embodiments, when the number of the control signal lines is larger or the strength of the voltage signal transmitted by the control signal lines is larger, the first antenna tuner 33 can be adapted to conduct more loads. For example, when there are 3 control signal lines each carrying a high voltage signal and a low voltage signal, eight combinations are generated, and thus the first antenna tuner 33 can be designed to conduct eight loads.
Please refer to fig. 1 again. The substrate 1 further has a clearance area 10, and the high frequency antenna 21 and the low frequency antenna 31 are disposed on the clearance area 10 of the substrate 1. The portion of the substrate 1 outside the clearance area 10 is a circuit board, the first antenna tuner 33, the processor 5, the matching component 25 and the signal source 20 are disposed on the circuit board, and the high-frequency antenna 21 excites the second resonance mode of the low-frequency antenna 31 through the ground current of the circuit board. Therefore, the high-frequency antenna 21 and the low-frequency antenna 31 do not need to have a signal source respectively, and only need to have one signal source 20 electrically coupled to the high-frequency antenna 21, so that the cost is reduced and the design flexibility is further improved.
There is no direct coupling between the high frequency antenna 21 and the low frequency antenna 31 of the parasitic monopole multi-frequency tunable antenna system 100. Further, the high frequency antenna 21 and the low frequency antenna 31 have a shortest distance S therebetween, and the shortest distance S is greater than 2 mm. In the prior art, the coupling antenna usually needs the interval between the high-frequency and low-frequency antennas to be less than 0.5-2 mm, and the high-frequency antenna can utilize electromagnetic coupling to excite the resonance mode of the low-frequency antenna. Thus, the design flexibility of the prior art has certain limitations, and the electromagnetic coupling of the high frequency antenna to the low frequency antenna also interferes with the frequency band of the high frequency emission. In the invention, because the high-frequency antenna 21 excites the resonance mode of the low-frequency antenna 31 through the ground current of the circuit board, the shortest distance S between the high-frequency antenna 21 and the low-frequency antenna 31 can be larger than 2mm, thereby not only improving the design flexibility, but also further avoiding the mutual interference of high and low radio frequencies.
Please refer to fig. 3, 4 and 5. Fig. 3 is a schematic diagram of a parasitic monopole multi-frequency tunable antenna system according to another embodiment of the invention. Fig. 4 is a schematic diagram of a parasitic monopole multi-frequency tunable antenna system according to another embodiment of the present invention. Fig. 5 is a schematic diagram of a parasitic monopole multi-frequency tunable antenna system according to another embodiment of the present invention. The antenna design of the present invention is not limited to fig. 1, and the low frequency antenna 31 may also surround in the clearance area 10, as shown in fig. 3. In another embodiment, the clearance area 10 of the substrate 1 may be tilted or perpendicular to the circuit board area of the substrate 1, and the low frequency antenna 31 and the high frequency antenna 21 are also disposed on the clearance area to form a three-dimensional structure, as shown in fig. 4. In another embodiment, only a section of the low-frequency antenna 31 near the second connection end 312 is disposed on the substrate, only a section of the high-frequency antenna 21 near the first connection end 211 is disposed on the substrate, and the remaining sections are bent away from the plane of the substrate 1 and extend in a three-dimensional space to form a three-dimensional structure, as shown in fig. 5. Since the shortest distance S between the high frequency antenna 21 and the low frequency antenna 31 can be larger than 2mm, the design of the high frequency antenna 21 and the low frequency antenna 31 is very flexible as described above. The high-frequency and low-frequency antennas can be designed in a more diversified way on a plane or in a three-dimensional space, and the purpose of the high-frequency and low-frequency antennas is to more effectively utilize the space in the miniaturized equipment. Therefore, the design of the miniaturized device in the prior art must be matched with the antenna on the circuit board, and the antenna on the circuit board can be designed according to the requirement of the miniaturized device in the invention.
Please refer to fig. 1, fig. 2, fig. 6A and fig. 6B. Fig. 6A is a return loss diagram of the parasitic monopole multi-band tunable antenna system 100 of fig. 1 in a frequency band actually verified. Fig. 6B is a plot of band efficiency for the actual verification of fig. 6A. The parasitic monopole multi-frequency adjustable frequency antenna system can adjust the second frequency band of the low-frequency antenna operation, and can influence the first frequency band of the high-frequency antenna operation to a very low degree. The first frequency band and the second frequency band refer to bandwidths with return loss less than-6 dB.
As described with reference to the embodiment of fig. 2, when the switch 333 of the first antenna tuner 33 turns on the low-frequency antenna 31 and the 8nH inductor 351, the return loss curve 611 is as shown in fig. 6A, and the second frequency band with the return loss less than-6 dB covers about 0.70GHz to about 0.80 GHz.
When the switch 333 of the first antenna tuner 33 turns on the low-frequency antenna 31 and the 4nH inductor 352, the return loss curve 612 is as shown in fig. 6A, and the second frequency band with the return loss less than-6 dB covers about 0.80GHz to 0.85 GHz.
When the switch 333 of the first antenna tuner 33 turns on the low-frequency antenna 31 and the transmission line 353 to be directly grounded, the return loss curve 613 is as shown in fig. 6A, and the second frequency band with the return loss smaller than-6 dB covers about 0.82GHz to 0.90 GHz.
When the switch 333 of the first antenna tuner 33 turns on the low frequency antenna 31 and the 4pF capacitor 354, the return loss curve 614 is shown in fig. 6A, and the second frequency band with the return loss less than-6 dB covers about 0.88GHz to 0.96 GHz.
Therefore, in this embodiment, the second frequency band may cover about 0.70GHz to 0.96GHz through the adjustment of the first antenna tuner, and the second frequency band covers a bandwidth greater than 260 MHz. On the other hand, the first frequency bands of the return loss curve 611, the return loss curve 612, the return loss curve 613 and the return loss curve 614 stably cover the range from 1.70GHz to 2.40GHz, and the covered bandwidth is greater than 700 MHz. It can be seen that the parasitic monopole multi-frequency tunable antenna system according to the present invention affects the high frequency first frequency band to a very low degree when adjusting the low frequency second frequency band. And the first frequency band and the second frequency band cover common important frequency bands, and the requirements of wireless communication equipment are met.
On the other hand, the radio frequency quality of the high and low frequency antennas operating in the first and second frequency bands, respectively, is also important. In conjunction with the embodiment of fig. 2, when the switch 333 of the first antenna tuner 33 turns on the low-frequency antenna 31 and the 8nH inductor 351, the efficiency curve 621 is shown in fig. 6B, and the efficiency value of the second frequency band covering 0.70 GHz-0.80 GHz is greater than 0.3.
When the switch 333 of the first antenna tuner 33 turns on the low frequency antenna 31 and the 4nH inductor 352, the efficiency value curve 622 is shown in fig. 6B, and the efficiency value of the second frequency band covering 0.78 GHz-0.82 GHz is greater than 0.4.
When the switch 333 of the first antenna tuner 33 turns on the low frequency antenna 31 and the transmission line 353, the efficiency value curve 623 is shown in fig. 6B, and the efficiency value of the second frequency band covering 0.80 GHz-0.90 GHz is greater than 0.4.
When the switch 333 of the first antenna tuner 33 turns on the low-frequency antenna 31 and the 4pF capacitor 354, the efficiency curve 624 is shown in fig. 6B, and the efficiency value of the second frequency band covering 0.90 GHz-1.0 GHz is greater than 0.4.
On the other hand, the first frequency bands of the efficiency curve 621, the efficiency curve 622, the efficiency curve 623 and the efficiency curve 624 cover the range from 1.70GHz to 2.10GHz, and the efficiency values thereof are steadily higher than 0.5.
Since the higher the efficiency value is, the better the radio frequency quality is, it can be known that the parasitic monopole multi-frequency tunable antenna system of the present invention can maintain a certain radio frequency quality of the second frequency band covered. And, when adjusting the second frequency band of low frequency, the first frequency band still keeps the very high radio frequency quality.
Please refer to fig. 7. Fig. 7 is a schematic diagram of a parasitic monopole multi-band tunable antenna system 100 according to another embodiment of the invention. In one embodiment, the parasitic monopole multi-frequency tunable antenna system 100 further includes a second antenna tuner 43 and a third antenna 41. The second antenna tuner 43 is disposed on the substrate 1, and the second antenna tuner 43 is used for adjusting the load. The third antenna 41 is disposed on the substrate 1, and the third antenna 41 has a third connection end 413 disposed on the substrate 1 and electrically coupled to the second antenna tuner 43. The third antenna 41 resonates with the signal source 20 through the substrate 1, and operates in a third frequency band through the second antenna tuner 43. There is no direct coupling between the third antenna 41 and the high frequency antenna 21 or the low frequency antenna 31.
In the present embodiment, the third antenna 41 is also parasitic to the high frequency antenna 21, and no additional signal source is required. And the first antenna tuner 33 and the second antenna tuner 43 are controlled by the signal from the processor 5 to adjust the third frequency band, so as to further extend the bandwidth covered by the parasitic monopole multi-frequency tunable antenna system 100, thereby achieving the purpose of low cost and high bandwidth.
Compared with the prior art, the parasitic monopole multi-frequency adjustable antenna system 100 of the invention adopts the design that the parasitic antenna and the antenna tuner are directly arranged in the circuit board area with low cost, so that the low-frequency antenna can independently adjust the frequency band, the frequency band of the high-frequency antenna is interfered to a very low degree, both the low-frequency antenna and the high-frequency antenna have certain radio frequency quality, and the bandwidth covered by the high-frequency antenna and the low-frequency antenna is wider. In addition, the highest limit on the interval of the high-frequency and low-frequency antennas can be reduced through a resonance mode formed by the circuit board, and the high-frequency and low-frequency antennas can be designed with high elasticity, so that the miniaturization of the wireless communication equipment is promoted.
The above detailed description of the preferred embodiments is provided to more clearly describe the features and spirit of the present invention, and the scope of the present invention is not limited by the above disclosed preferred embodiments. Rather, the scope of the invention includes all variations and equivalent combinations that fall within the scope of the claims. The scope of the claims to be accorded the broadest interpretation in view of the foregoing description is therefore intended to encompass all such modifications and equivalent combinations. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the disclosure, which is therefore to be limited only by the claims appended hereto.
Claims (9)
1. A parasitic monopole multi-frequency tunable antenna system, comprising:
a substrate including a clearance area and a circuit board;
a signal source arranged on the circuit board of the substrate;
the high-frequency antenna is arranged in the clearance area of the substrate and is provided with a first connecting end, the first connecting end is positioned on the substrate and is electrically coupled with the signal source, and the high-frequency antenna works in a first frequency band;
the first antenna tuner is arranged on the circuit board of the substrate and used for adjusting load; and
the low-frequency antenna is arranged in the clearance area of the substrate and is provided with a second connecting end which is positioned on the substrate and is electrically coupled with the first antenna tuner;
the low-frequency antenna, the substrate and the signal source generate resonance, the first antenna tuner works in a second frequency band, the high-frequency antenna and the low-frequency antenna are not directly coupled, and the high-frequency antenna excites a second resonance mode of the low-frequency antenna through ground current of the circuit board.
2. The parasitic monopole multi-frequency adjustable antenna system according to claim 1, further comprising a processor coupled to the first antenna tuner for controlling the first antenna tuner to adjust a load.
3. The parasitic monopole multi-frequency tunable antenna system according to claim 2, wherein the first antenna tuner further comprises a switching circuit and a plurality of loads, the switching circuit is electrically coupled to the processor and the loads, the switching circuit is controlled by the processor to switch the loads, and the loads comprise wires, inductors, resistors and capacitors.
4. The parasitic monopole multi-frequency tunable antenna system according to claim 1, wherein the second frequency band is a bandwidth with a return loss of less than-6 dB, and the second frequency band covers a bandwidth of more than 260MHz through tuning of the first antenna tuner.
5. The parasitic monopole multi-frequency tunable antenna system according to claim 4, wherein the second frequency band covers 0.70GHz to 0.96 GHz.
6. The parasitic monopole multi-frequency tunable antenna system according to claim 1, wherein the first frequency band refers to a bandwidth with a return loss of less than-6 dB, and covers a bandwidth of more than 700 MHz.
7. The parasitic monopole multi-frequency tunable antenna system according to claim 6, wherein the first frequency band covers 1.70GHz to 2.40 GHz.
8. The parasitic monopole multi-frequency tunable antenna system according to claim 1, wherein the high frequency antenna and the low frequency antenna have a shortest distance therebetween, and the shortest distance is greater than 2 mm.
9. The parasitic monopole multi-frequency adjustable antenna system according to claim 1, further comprising:
a second antenna tuner disposed on the substrate, the second antenna tuner for adjusting a load; and
the third antenna is arranged on the substrate and provided with a third connecting end, and the third connecting end is positioned on the substrate and is electrically coupled with the second antenna tuner;
the third antenna resonates with the substrate and the signal source and operates in a third frequency band through the second antenna tuner.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811295019.8A CN109449611B (en) | 2018-11-01 | 2018-11-01 | Parasitic monopole multi-frequency adjustable-frequency antenna system |
| TW108100680A TW202019018A (en) | 2018-11-01 | 2019-01-08 | Parasitic monopole multi-frequency adjustable antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811295019.8A CN109449611B (en) | 2018-11-01 | 2018-11-01 | Parasitic monopole multi-frequency adjustable-frequency antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109449611A CN109449611A (en) | 2019-03-08 |
| CN109449611B true CN109449611B (en) | 2020-10-27 |
Family
ID=65550137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811295019.8A Active CN109449611B (en) | 2018-11-01 | 2018-11-01 | Parasitic monopole multi-frequency adjustable-frequency antenna system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109449611B (en) |
| TW (1) | TW202019018A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202997059U (en) * | 2012-10-29 | 2013-06-12 | 英华达（上海）科技有限公司 | High and low frequency distributed antenna structure |
| CN105284004A (en) * | 2013-08-20 | 2016-01-27 | 华为技术有限公司 | System and method for mobile antenna with adjustable resonant frequencies and radiation pattern |
| WO2016045436A1 (en) * | 2014-09-24 | 2016-03-31 | 中兴通讯股份有限公司 | Wide frequency band 4g wireless terminal antenna |
| CN104037502B (en) * | 2013-03-06 | 2016-07-13 | 华硕电脑股份有限公司 | Frequency-modulated antenna |
| CN105811123A (en) * | 2014-12-31 | 2016-07-27 | 联想(北京)有限公司 | Antenna system and electronic device |
| CN107819206A (en) * | 2016-09-12 | 2018-03-20 | 三星电子株式会社 | Antenna and the electronic equipment including antenna |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7173567B2 (en) * | 2003-01-16 | 2007-02-06 | Matsushita Electric Industrial Co., Ltd. | Antenna |
| US7193574B2 (en) * | 2004-10-18 | 2007-03-20 | Interdigital Technology Corporation | Antenna for controlling a beam direction both in azimuth and elevation |
| US7830320B2 (en) * | 2007-08-20 | 2010-11-09 | Ethertronics, Inc. | Antenna with active elements |
| JP2012160951A (en) * | 2011-02-01 | 2012-08-23 | Toshiba Corp | Multi-resonance antenna device, and electronic apparatus equipped with antenna device |
| CN102646864A (en) * | 2011-02-18 | 2012-08-22 | 英华达（上海）科技有限公司 | Flexible multiple antenna |
-
2018
- 2018-11-01 CN CN201811295019.8A patent/CN109449611B/en active Active
-
2019
- 2019-01-08 TW TW108100680A patent/TW202019018A/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202997059U (en) * | 2012-10-29 | 2013-06-12 | 英华达（上海）科技有限公司 | High and low frequency distributed antenna structure |
| CN104037502B (en) * | 2013-03-06 | 2016-07-13 | 华硕电脑股份有限公司 | Frequency-modulated antenna |
| CN105284004A (en) * | 2013-08-20 | 2016-01-27 | 华为技术有限公司 | System and method for mobile antenna with adjustable resonant frequencies and radiation pattern |
| WO2016045436A1 (en) * | 2014-09-24 | 2016-03-31 | 中兴通讯股份有限公司 | Wide frequency band 4g wireless terminal antenna |
| CN105811123A (en) * | 2014-12-31 | 2016-07-27 | 联想(北京)有限公司 | Antenna system and electronic device |
| CN107819206A (en) * | 2016-09-12 | 2018-03-20 | 三星电子株式会社 | Antenna and the electronic equipment including antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109449611A (en) | 2019-03-08 |
| TW202019018A (en) | 2020-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101031052B1 (en) | Multiband antenna component | |
| KR100638621B1 (en) | Broadband internal antenna | |
| US7170456B2 (en) | Dielectric chip antenna structure | |
| JP5009240B2 (en) | Multiband antenna and wireless communication terminal | |
| US8339321B2 (en) | Antenna device and portable radio apparatus | |
| EP3057177B1 (en) | Adjustable antenna and terminal | |
| JP4858860B2 (en) | Multiband antenna | |
| CN111029729A (en) | Antenna assembly and electronic equipment | |
| KR20010081072A (en) | Half-loop antenna | |
| WO2006109184A1 (en) | An antenna having a plurality of resonant frequencies | |
| EP0860897B1 (en) | Antenna system | |
| JP2012518300A (en) | Antenna configuration, printed circuit board, portable electronic device, and conversion kit | |
| JP2002359514A (en) | Helical antenna | |
| CN112421211B (en) | Antenna and electronic equipment | |
| US20110285596A1 (en) | Inductively coupled band selectable and tunable antenna | |
| US7053839B2 (en) | Antenna for a portable communication apparatus, and a portable communication apparatus comprising such an antenna | |
| CN1270406C (en) | Antenna apparatus with inner antenna and grounded outer helix antenna | |
| US9007270B2 (en) | VHF/UHF broadband dual channel antenna | |
| EP1932216A1 (en) | Subminiature internal antenna | |
| JP2012060380A (en) | Antenna device | |
| US9054426B2 (en) | Radio apparatus and antenna device | |
| CN109449611B (en) | Parasitic monopole multi-frequency adjustable-frequency antenna system | |
| JP2006325093A (en) | Portable radio equipment | |
| JPH09232854A (en) | Small planar antenna system for mobile radio equipment | |
| KR101495910B1 (en) | Wide Band Hellical Antenna for Poertable Terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |