CN201749953U - Double-frequency antenna - Google Patents
Double-frequency antenna Download PDFInfo
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- CN201749953U CN201749953U CN 201020258343 CN201020258343U CN201749953U CN 201749953 U CN201749953 U CN 201749953U CN 201020258343 CN201020258343 CN 201020258343 CN 201020258343 U CN201020258343 U CN 201020258343U CN 201749953 U CN201749953 U CN 201749953U
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Abstract
The utility model relates to a double-frequency antenna, which comprises a spiral coil, a first coupling unit and a second coupling unit, wherein a first resonance coil with a first pitch is arranged at the lower end of the spiral coil, a second resonance coil with a second pitch is arranged at the upper end of the spiral coil and is used for generating resonance with resonance frequency lower than that of the first resonance coil, and the first pitch is larger than the second pitch; the first coupling unit is arranged in the first resonance coil, is electrically isolated from the first resonance coil and is used for stabilizing the resonance frequency performance of the first resonance coil; and the second coupling unit is arranged outside the spiral coil, is electrically isolated from the spiral coil and is used for increasing the equivalent electrical length of the first resonance coil to increase the resonance frequency gain of the first resonance coil. In the utility model, the high-frequency part of a partial resonance structure is improved through the two coupling units, so as to obtain better resonance frequency performance of the first resonance coil, the performance of the first resonance coil is more centralized on an upper spherical surface, and the distribution of current and the electric length of the first resonance coil are increased.
Description
Technical field
The utility model relates to a kind of antenna, more particularly, relates to a kind of dual-band antenna.
Background technology
At present, hand-held terminal device has a plurality of frequency ranges usually to realize a plurality of functions or miscellaneous function, global system for mobile communications (GSM) and the required frequency range of Digital Cellular System (DCS) as mobile phone, hyperfrequency of intercom (UHF) and global positioning system frequency (GPS) etc., its corresponding antenna also is double frequency or multifrequency, the dual-band antenna of the prior art dual-band antennas that adopt two a period of time structures or partial resonance structure more.Adopt the dual-band antenna of two a period of time structures that two antennas are merged, place under the distributing point, two antennas have resonance separately and are independent of each other.Normally helical structure constitutes low-frequency resonant, and the whip structure realizes HFS.The length of helical structure is half-wavelength (low-frequency resonant frequency), and the length of whip structure is quarter-wave (high-frequency resonant frequency), and the antenna performance under two frequencies is similar to the performance of half-wave dipole.
The dual-band antenna of partial resonance structure changes the resonance that can realize double frequency with the part-structure pitch of spiral, and the part that changes pitch is a resonance length of needed another frequency, and the antenna performance under two frequencies is similar to the performance of half-wave dipole.Present external dual-band antenna adopts the structure of partial resonance to realize mostly, adopts helical structure to realize, high-frequency resonant partly is placed on the bottom of coil, and it and another part constitute the resonance of lower frequency jointly.Concrete structure can be referring to shown in Figure 1.
Above-mentioned two kinds of external spiral dual-band antennas are mode of operations of UHF/VHF (very high frequency(VHF))+GPS frequency range, the pitch of coil sections is changed or add the bottom that one 1/4th whip antenna is placed on spiral, form resonance.This design is simple relatively, and every for the GPS frequency range, the performance of antenna more concentrates on second sphere, at needed first sphere of GPS (part that points into the sky), a very big depression is arranged, and performance is poor, is unfavorable for the reception of gps signal.
If at VHF frequency range design dual-band antenna, the gap of two frequencies is huge so, is about 10 frequencys multiplication in addition, a little bias of VHF frequency all can cause the greatest differences of gps signal.
The utility model content
The technical problems to be solved in the utility model is, goes up undesirable, the GPS receptivity defect of bad of performance at dual-band antenna in the above-mentioned prior art of prior art at first sphere (direction that points into the sky), and a kind of dual-band antenna is provided.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of dual-band antenna, comprise helical coil, the lower end of described helical coil is set to have first resonance coil of first segment distance, produce first resonance frequency, the upper end of described helical coil is set to have second pitch and is used to produce second resonance coil than the lower resonance of described first resonance frequency, and described first segment is apart from greater than described second pitch; Also comprise:
First coupling unit that is used to stablize the first resonance coil resonance frequency performance that is arranged in first resonance coil and isolates with first resonance coil electricity;
Be arranged at outer and second coupling unit that increase by the first resonance coil equivalent electric length and improve the first coil resonance frequency gain with helical coil electricity being used to of isolating of helical coil.
The beneficial effects of the utility model are by increase by first coupling unit in the HFS of partial resonance structure, thereby to obtain the performance of the first resonance coil resonance frequency preferably, and do not influence the performance of second resonance coil.Make the performance of the resonance coil resonance frequency of winning more concentrate on first sphere.Two coupling units that add have increased the distributed current of first resonance coil, have increased the electrical length of first resonance coil simultaneously.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the partial resonance Double-frequency antenna structure schematic diagram that in the prior art high-frequency resonant is placed the helical coil bottom;
Fig. 2 is the Double-frequency antenna structure schematic diagram according to the utility model one embodiment;
Fig. 3 is the Double-frequency antenna structure schematic diagram according to another embodiment of the utility model;
Fig. 4 is the GPS frequency band index schematic diagram of dual-band antenna shown in Figure 3;
Fig. 5 is the GPS gain emulation directional diagram of dual-band antenna shown in Figure 3;
Fig. 6 is the VHF frequency band index schematic diagram of dual-band antenna shown in Figure 3;
Fig. 7 is the VHF gain emulation directional diagram of dual-band antenna shown in Figure 3;
Fig. 8 is the VHF frequency range antenna pattern of dual-band antenna sample shown in Figure 3;
Fig. 9 is the GPS frequency range antenna pattern of dual-band antenna sample shown in Figure 3.
Embodiment
Fig. 2 is the Double-frequency antenna structure schematic diagram according to the utility model one embodiment.Dual-band antenna 200 shown in Figure 2 comprises helical coil 201, first coupling unit 202.The lower end of helical coil 201 is set to have the first resonance coil 201A of first segment distance, the upper end of described helical coil 201 is set to have second pitch and is used to produce the second resonance coil 201B of the resonance lower than the described first resonance coil 201A resonance frequency, and wherein the first segment distance is greater than second pitch.The performance that is used to stablize the first resonance coil resonance frequency that first coupling unit 202 is arranged in first resonance coil and isolates with first resonance coil electricity.By increasing by first coupling unit 202, thereby obtain the performance of the first resonance coil resonance frequency preferably, and do not influence the performance of second resonance coil.Make the performance of the resonance coil resonance frequency of winning more concentrate on first sphere.Spurious impedance is to concern the key factor that the GPS performance can settle out, and increases the spurious impedance that first coupling unit 202 can improve the first resonance coil 201A.
Fig. 3 is the Double-frequency antenna structure schematic diagram according to another embodiment of the utility model.Be with the difference of Fig. 2, dual-band antenna shown in Figure 3 comprises that also second coupling unit, 203, the second coupling units 203 are arranged at helical coil and gain outward and with the electric resonance frequency that is used to increase by the first resonance coil equivalent electric length and improve first resonance coil of isolating of helical coil.Second coupling unit 203 has increased the height of second resonance coil in fact.Two coupling units among Fig. 2 and Fig. 3 have increased the distributed current of first resonance coil, have increased the electrical length of first resonance coil simultaneously.
Fig. 2 and helical coil 201 shown in Figure 3 are complete coils, and the upper and lower has different pitches.For the convenience on describing, the coil with first segment distance on top is called the first resonance coil 201A, the coil with second pitch of bottom is called the second resonance coil 201B.Generally, Fig. 2 and dual-band antenna shown in Figure 3 are operated in GPS and VHF frequency range, and wherein the first resonance coil 201A is operated in the GPS frequency range, and the second resonance coil 201B is operated in the VHF frequency range.Magnitude relationship about the first segment distance and second pitch is fixed by variable-pitch screw coil 201, and is just passable as long as variable-pitch screw coil 201 can realize that double frequency receives.Generally speaking, the size of first segment distance is more than the twice of second pitch, guarantees the basic property of GPS frequency range.
In the utility model one embodiment, the length of the first resonance coil 201A is about the half wavelength of the first resonance coil 201A working frequency range (GPS frequency range), and the length of the second resonance coil 201B is about the half wavelength of the second resonance coil 201B working frequency range (VHF frequency range).
Figure 2 shows that the floor map of dual-band antenna 200, first coupling unit 202 that shows among the figure is rectangle, being actually its section is rectangle, the cylinder that first coupling unit 202 is made for metal material, its radius approaches the internal diameter of (being slightly less than) helical coil, and the height of first coupling unit 202 is about 1/8th wavelength of the first resonance coil working frequency range.Second coupling unit 203 among Fig. 3 is a wire, and length is smaller or equal to the half wavelength (9.5mm) of the first resonance coil working frequency range (GPS frequency range).
In the utility model one embodiment, the Rotary-table of the handstand that first coupling unit 202 is made for metal material, the bottom is last, and near the second resonance coil 201B, the radius of bottom approaches the internal diameter of helical coil.This scheme can be used as implements preferred version of the present utility model.In another embodiment of the utility model, the cone that first coupling unit 202 is made for metal material.
In the utility model one embodiment, second coupling unit 203 is a wire, and an end for example can be the annulus (also promptly this annulus is non-sealing) with opening for around the first resonance coil 201A and annulus with fixation.The annulus end of second coupling unit 203 is arranged on the outside of the first resonance coil 201A, and the other end extends to certain part of the second resonance coil 201B.
Annulus with opening can be arranged at the position at the close two ends of the first resonance coil 201A, can realize voltage coupling in this case, makes the voltage maximum.The length of second coupling unit 203 is smaller or equal to the half wavelength of GPS frequency range.
In the another embodiment of the utility model, an end of second coupling unit 203 is to be arranged at described first resonance coil middle part and around the closed circle of described first resonance coil, can to realize the maximum current coupling in this case.
Among Fig. 2 and Fig. 3, first coupling unit 202 and second coupling unit 203 are isolated with the helical coil electricity, that is to say with helical coil not electrically contact.
Dual-band antenna 200 makes the GPS performance more concentrate on first sphere.First coupling unit 202 that adopts makes the stable performance of GPS resonance coil.Second coupling unit 203 can increase the equivalent electric length of GPS, promotes the gain of GPS resonance frequency.
Dual-band antenna 200 of the present utility model can be applicable on professional intercom or other the electronic equipment.Distributing point by electronic equipment is electrically connected with electronic equipment, thereby the signal that receives can be sent to electronic equipment.
In order more clearly to explain the performance of the dual-band antenna that the utility model provides, introduce the simulation result of dual-band antenna 200 below.
Fig. 4 is the GPS frequency band index schematic diagram of dual-band antenna shown in Figure 3, and Fig. 5 is the GPS gain emulation directional diagram of dual-band antenna shown in Figure 3.By Fig. 4-5 as can be known, the better performances of GPS frequency range, the performance of antenna has half to concentrate on first sphere, about the about 0dBi of antenna gain, and higher maximum gain angle (peak gain angle is arranged, be called for short PGA) (gain data of this emulation is disregarded the ideal value of PCB loss for not adding antenna overcoat and host housing).M3, m4, m5, m6 position show PGA among Fig. 5, and m7 has indicated the position of the gain minimum value of two lobes.
Fig. 6 is the VHF frequency band index schematic diagram of dual-band antenna shown in Figure 3; Fig. 7 is the VHF gain emulation directional diagram of dual-band antenna shown in Figure 3.By Fig. 6-7 as can be known, dual-band antenna of the present utility model does not influence the performance of VHF when improving the GPS performance.
For the dual-band antenna performance that can verify that the utility model provides, use network analyzer and microwave dark room that the dual-band antenna sample of foundation the utility model design is tested.Fig. 8 is the VHF frequency range antenna pattern of dual-band antenna shown in Figure 3; Fig. 9 is the GPS frequency range antenna pattern of dual-band antenna shown in Figure 3.
From Fig. 8-9 as can be seen, the gain index of antenna is fine, the gain of VHF frequency range (being illustrated as 160MHz) has-5dBi about, the gain of GPS frequency range (being illustrated as 1575MHz) is about about 0dBi, directional diagram parameter near symmetry is arranged, the basically identical of GPS gain pattern and emulation.Therefore, use dual-band antenna of the present utility model, GPS performance preferably can be arranged, and do not influence the performance of VHF.Intercom in specialty uses, and GPS can have good reception.
The above only is a preferred embodiment of the present utility model, not in order to restriction the utility model, all any modifications of being done in spirit of the present utility model and principle, is equal to and replaces or improvement etc., all should be included in the protection range of the present utility model.
Claims (10)
1. dual-band antenna, comprise helical coil, the lower end of described helical coil is set to have first resonance coil of first segment distance, the upper end of described helical coil is set to have second pitch and is used to produce second resonance coil of the resonance lower than the described first resonance coil resonance frequency, and described first segment distance is greater than described second pitch; It is characterized in that, also comprise:
First coupling unit that is used to stablize the first resonance coil resonance frequency performance that is arranged in first resonance coil and isolates with first resonance coil electricity.
2. dual-band antenna according to claim 1 is characterized in that, also comprises being arranged at outer and second coupling unit that increase by the first resonance coil equivalent electric length and improve the first coil resonance frequency gain with helical coil electricity being used to of isolating of helical coil.
3. dual-band antenna according to claim 1 is characterized in that the length of described first resonance coil is about the half wavelength of the first resonance coil working frequency range, and the length of described second resonance coil is about the half wavelength of the second resonance coil working frequency range.
4. dual-band antenna according to claim 1 is characterized in that, described first coupling unit is the cylinder made of metal material or the round platform of handstand.
5. dual-band antenna according to claim 4 is characterized in that, the height of described first coupling unit is about 1/8th wavelength of the first resonance coil working frequency range.
6. dual-band antenna according to claim 2 is characterized in that, described second coupling unit is a wire, and length is smaller or equal to the half wavelength of the first resonance coil working frequency range.
7. dual-band antenna according to claim 6 is characterized in that, an end of described second coupling unit is for around described first resonance coil and annulus with fixation.
8. dual-band antenna according to claim 6 is characterized in that, an end of described second coupling unit is to be arranged at described first resonance coil middle part and around the closed circle of described first resonance coil.
9. dual-band antenna according to claim 2 is characterized in that the diameter of described first coupling unit is slightly less than the internal diameter of first resonance coil.
10. dual-band antenna according to claim 2 is characterized in that, first resonance coil of described helical coil is operated in the GPS frequency range, and second resonance coil of described helical coil is operated in the VHF frequency range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020258343 CN201749953U (en) | 2010-07-14 | 2010-07-14 | Double-frequency antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020258343 CN201749953U (en) | 2010-07-14 | 2010-07-14 | Double-frequency antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201749953U true CN201749953U (en) | 2011-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020258343 Expired - Lifetime CN201749953U (en) | 2010-07-14 | 2010-07-14 | Double-frequency antenna |
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| Country | Link |
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| CN (1) | CN201749953U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916916A (en) * | 2010-07-14 | 2010-12-15 | 海能达通信股份有限公司 | Dual-band antenna |
| CN109301434A (en) * | 2018-10-09 | 2019-02-01 | 江苏三和欣创通信科技有限公司 | A kind of high-precision four-arm spiral antenna |
-
2010
- 2010-07-14 CN CN 201020258343 patent/CN201749953U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916916A (en) * | 2010-07-14 | 2010-12-15 | 海能达通信股份有限公司 | Dual-band antenna |
| CN101916916B (en) * | 2010-07-14 | 2013-11-27 | 海能达通信股份有限公司 | Dual-band antenna |
| CN109301434A (en) * | 2018-10-09 | 2019-02-01 | 江苏三和欣创通信科技有限公司 | A kind of high-precision four-arm spiral antenna |
| CN109301434B (en) * | 2018-10-09 | 2020-04-14 | 江苏三和欣创通信科技有限公司 | High-precision four-arm helical antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110216 Effective date of abandoning: 20131127 |
|
| RGAV | Abandon patent right to avoid regrant |