CN103746171A - 2405MHz radio frequency module of on-board PCB antenna - Google Patents
2405MHz radio frequency module of on-board PCB antenna Download PDFInfo
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- CN103746171A CN103746171A CN201310738567.4A CN201310738567A CN103746171A CN 103746171 A CN103746171 A CN 103746171A CN 201310738567 A CN201310738567 A CN 201310738567A CN 103746171 A CN103746171 A CN 103746171A
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Abstract
The invention relates to a PCB circuit board, in particular to a 2405MHz radio frequency module of on-board PCB antenna. The 2405MHz radio frequency module of on-board PCB antenna comprises a PCB substrate, a radio frequency transceiving module arranged on the PCB substrate, a balanced-unbalanced circuit, an antenna, an antenna gain module, wherein the radio frequency transceiving module through the balanced-unbalanced circuit is connected with the antenna gain module which is connected with the antenna. According to the 2405MHz radio frequency module of on-board PCB antenna, unit number is changed to realize different gain, and the antenna has advantages of high efficiency, stable and reliable performance, low cast, etc.
Description
Technical field
The present invention relates to a kind of PCB circuit board, relate in particular to the 2405MHz radio-frequency module that a kind of plate carries PCB antenna.
Background technology
PCB(Printed Circuit Board, printed circuit board (PCB)) effect generally comprises: 1. the mechanical support that provides the various electronic devices and components such as integrated circuit to fix, assemble; 2. realize wiring and electrical connection (signal transmission) or electric insulation between the various electronic devices and components such as integrated circuit.Provide desired electrical characteristic, as characteristic impedance etc.
Antenna is a kind of transducer.During transmitting, it is converted into space electromagnetic wave the high-frequency current of transmitter; During reception, it is converted to high-frequency current the electromagnetic wave of intercepting and capturing from space again and sends into receiver.For small-power, a short-distance wireless transceiver that is applied to wireless sense network or active RFID type of design, Antenna Design is pith wherein.Good antenna system can make communication distance reach optimum state.The kind of antenna is a lot, and in the radio system lower than 3GHz frequency, conventional antenna system comprises spring antenna, bar antenna, directional antenna, Yagi antenna and PCB antenna etc.Adopt now PCB printed panel (printed circuit board (PCB)) as in radiative unit structure, it adopts solid plane oscillator arms, there is following problem: gain on the low side, bandwidth is partially narrow, section is higher, third order intermodulation index is undesirable, these problems cause the communication quality in service area to can not get ensureing.
The leading indicator of weighing antenna performance is antenna directivity parameter and antenna gain parameter, wherein: directivity parameter represents that different antennas has different directional diagrams, for representing the degree of their concentrated radiations, the sharp-pointed degree of directional diagram, our incoming direction parameter.Desirable point source aerial radiation does not have directivity, and in all directions, radiation intensity equates, direction is a spheroid.We using desirable some source antenna and compare as standard and actual antennas, and the ratio that results from the electric field strength square E2 of certain point and square E02 of the electric field strength that desirable some source antenna produces in same point at identical radiant power antenna is called the directivity parameter D=E2/E02 of this point.
Antenna gain: gain and directivity factor are both the parameter that characterizes radiant power intensity, but both are not quite similar again.Gain is discussed under same power output condition, and directivity factor is discussed under same radiant power condition.Because the radiation intensity of antenna all directions is also unequal, the directivity factor of antenna and gain change along with the difference of point of observation, but its variation tendency is consistent.Usually, in actual applications, get the directivity factor of greatest irradiation direction and gain as directivity factor and the gain of antenna.
In small-power, short-range wireless sense network system or active RFID system, because the volume of product is little, need the Antenna Design that an individual system is little, cheap, communication distance is far away as far as possible, in above-mentioned antenna system, volume is little, cost of manufacture is low for PCB antenna, but communication distance is generally less than other antenna.
Summary of the invention
Technique effect of the present invention can overcome above-mentioned defect, the 2405MHz radio-frequency module that provides a kind of plate to carry PCB antenna, and it effectively increases antenna gain, improves the communication distance of radio-frequency module in wireless sense network and active RFID system.
For achieving the above object, the present invention adopts following technical scheme: it comprises PCB substrate, PCB substrate is provided with radio-frequency (RF) receiving and transmission module, balanced-unbalanced circuit, antenna, antenna gain module, radio-frequency (RF) receiving and transmission module is connected with antenna gain module by balanced-unbalanced circuit, and antenna gain module connects antenna.
Balanced-unbalanced circuit (is again Ba Lun Balun, the English transliteration of balanced-to-unblanced transformer), principle is by antenna theory, dipole antenna belongs to balanced type antenna, and coaxial cable belongs to uneven transmission now, if it is directly connected, the crust of coaxial cable just has high-frequency current to flow through (by coaxial cable transmission principle, high-frequency current should be in cable internal flow, crust is screen, there is no electric current), so, will affect the radiation (screen that can be imagined as cable has also participated in the radiation of electric wave) of antenna therefore, will between antenna and cable, add balun, the electric current that flows into cable shield outside is controlled to fall, that is to say the high-frequency current that flows through cable shield crust from oscillator is blocked.
Preferably, antenna gain module is crescent sheet metal, and crescent sheet metal copper content is greater than 90%.
The computational methods of wavelength: frequency=velocity of wave/wavelength, velocity of wave is the light velocity: 300000000m/s, and frequency is 2405MHz, and wavelength equals 0.1247 meter.
The outer arc radius of crescent sheet metal is 0.195cm, and the angle between outer arc two-end-point is 11.9 °, and the inner arc radius of crescent sheet metal is 0.499cm, and the maximum ga(u)ge between outer arc and inner arc is 0.02cm.
Through the radius extended line at crescent sheet metal outer arc center and the angle between the process radius extended line at crescent sheet metal inner arc center, it is 6.0 °.
The extrados of crescent sheet metal protrudes from PCB base plan and perpendicular to PCB base plan; The inner arc of crescent sheet metal is attached in PCB base plan.The bottom surface of crescent sheet metal is laid on PCB substrate, protrudes from PCB substrate and rounding off between another side inner arc and outer arc.
Described radio-frequency (RF) receiving and transmission module adopts TI CC2500 model.
Pcb board of the present invention carries the radio frequency antenna module of 2405MHz, changes number of unit, realizes different gains, and this antenna has the features such as efficiency is high, stable and reliable for performance, cost is low.By increasing an assembly cheaply, effectively increase antenna gain, improve the communication distance of radio-frequency module in wireless sense network and active RFID system.Effectively improve the property symmetrically of the far field direction of PCB antenna, and possess the adjustment capability to antenna frequencies, size, gain, direction by the parameter adjustment acquisition from coupled zone loading cabling, thereby the applicable portable terminal layout requirement changeable to built-in antenna complex better.
Accompanying drawing explanation
Fig. 1 is modular structure schematic diagram of the present invention;
Fig. 2 is gain module structural representation of the present invention.
In figure: 1-crescent sheet metal; 2-inner arc; 3-outer arc.
Embodiment
As shown in Figure 1, the radio frequency antenna module that pcb board of the present invention carries 2405MHz comprises PCB substrate, PCB substrate is provided with radio-frequency (RF) receiving and transmission module, balanced-unbalanced circuit, antenna, antenna gain module, radio-frequency (RF) receiving and transmission module is connected with antenna gain module by balanced-unbalanced circuit, and antenna gain module connects antenna.
As shown in Figure 2, antenna gain module is crescent sheet metal 1, and its copper content is greater than 90%.
The outer arc radius of crescent sheet metal 1 is 0.195cm, and the angle between outer arc two-end-point is 11.9 °, and the inner arc radius of crescent sheet metal is 0.499cm, and the maximum ga(u)ge between outer arc and inner arc is 0.02cm.
Through the radius extended line at crescent sheet metal 1 outer arc center and the angle between the process radius extended line at crescent sheet metal inner arc center, it is 6.0 °.
The extrados of crescent sheet metal 1 protrudes from PCB base plan and perpendicular to PCB base plan; The inner arc of crescent sheet metal 1 is attached in PCB base plan.The bottom surface of crescent sheet metal 1 is laid on PCB substrate, between another side inner arc 2 and outer arc 3, protrudes from PCB substrate and rounding off.
Described radio-frequency (RF) receiving and transmission module adopts TI CC2500 model.
Embodiment 1
At storage active RFID, set in system, each warehouse is generally divided into goods laydown area and passageway, in passageway, can allow fork truck current, the radio-frequency module of installing on fork truck can be communicated by letter with radio-frequency module of carry on every goods, the function that realizes quick counting and look for goods; Before not implementing the present invention, radio-frequency module on fork truck in passageway can only be communicated by letter by the radio-frequency module on goods with carry within 20m, adopt after technical scheme of the present invention, because antenna gain increases, effectively increased communication distance, the radio-frequency module of installing on fork truck can communicate with interior module with 30m, makes this system can adapt to larger and higher warehouse.
In the RFID recognition system of campus student location, student wears the school badge that comprises radio-frequency module, fixing radio-frequency module is installed within the scope of school, by the communication between 2 modules, can determine student's residing position, before not implementing the present invention, at the every 50m of corridor, a radio-frequency module need to be installed, after implementing technical scheme of the present invention, the antenna gain of the school badge that comprises radio-frequency module of wearing due to student increases, can communicate with farther stuck-module, therefore only need 75m to increase in corridor, a radio-frequency module is installed, effectively reduce cost.
Claims (7)
1. a plate carries the 2405MHz radio-frequency module of PCB antenna, comprise PCB substrate, it is characterized in that, PCB substrate is provided with radio-frequency (RF) receiving and transmission module, balanced-unbalanced circuit, antenna, antenna gain module, radio-frequency (RF) receiving and transmission module is connected with antenna gain module by balanced-unbalanced circuit, and antenna gain module connects antenna.
2. plate according to claim 1 carries the 2405MHz radio-frequency module of PCB antenna, it is characterized in that, antenna gain module is crescent sheet metal (1).
3. plate according to claim 2 carries the 2405MHz radio-frequency module of PCB antenna, it is characterized in that, the outer arc radius of crescent sheet metal (1) is 0.195cm, angle between outer arc two-end-point is 11.9 °, the inner arc radius of crescent sheet metal is 0.499cm, and the maximum ga(u)ge between outer arc and inner arc is 0.02cm.
4. plate according to claim 3 carries the 2405MHz radio-frequency module of PCB antenna, it is characterized in that, and through the radius extended line at crescent sheet metal outer arc center and the angle between the process radius extended line at crescent sheet metal inner arc center, be 6.0 °.
5. plate according to claim 2 carries the 2405MHz radio-frequency module of PCB antenna, it is characterized in that, the extrados of crescent sheet metal (1) protrudes from PCB base plan and perpendicular to PCB base plan; The inner arc of crescent sheet metal (1) is attached in PCB base plan.The bottom surface of crescent sheet metal (1) is laid on PCB substrate, between another side inner arc (2) and outer arc (3), protrudes from PCB substrate and rounding off.
6. plate according to claim 2 carries the 2405MHz radio-frequency module of PCB antenna, it is characterized in that, crescent sheet metal (1) copper content is greater than 90%.
7. plate according to claim 1 and 2 carries the 2405MHz radio-frequency module of PCB antenna, it is characterized in that, radio-frequency (RF) receiving and transmission module adopts TI CC2500 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310738567.4A CN103746171A (en) | 2013-12-27 | 2013-12-27 | 2405MHz radio frequency module of on-board PCB antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310738567.4A CN103746171A (en) | 2013-12-27 | 2013-12-27 | 2405MHz radio frequency module of on-board PCB antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103746171A true CN103746171A (en) | 2014-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310738567.4A Pending CN103746171A (en) | 2013-12-27 | 2013-12-27 | 2405MHz radio frequency module of on-board PCB antenna |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004072320A (en) * | 2002-08-05 | 2004-03-04 | Alps Electric Co Ltd | Antenna system |
| CN201163660Y (en) * | 2008-02-22 | 2008-12-10 | 深圳市远望谷信息技术股份有限公司 | Integration antenna |
| US20100225554A1 (en) * | 2009-03-03 | 2010-09-09 | Rayspan Corporation | Balanced Metamaterial Antenna Device |
| CN201699133U (en) * | 2010-04-14 | 2011-01-05 | 耀登科技股份有限公司 | Antenna structure of wireless radio-frequency identification system |
-
2013
- 2013-12-27 CN CN201310738567.4A patent/CN103746171A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004072320A (en) * | 2002-08-05 | 2004-03-04 | Alps Electric Co Ltd | Antenna system |
| CN201163660Y (en) * | 2008-02-22 | 2008-12-10 | 深圳市远望谷信息技术股份有限公司 | Integration antenna |
| US20100225554A1 (en) * | 2009-03-03 | 2010-09-09 | Rayspan Corporation | Balanced Metamaterial Antenna Device |
| CN201699133U (en) * | 2010-04-14 | 2011-01-05 | 耀登科技股份有限公司 | Antenna structure of wireless radio-frequency identification system |
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| AD01 | Patent right deemed abandoned | ||
| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20170301 |