pcb天线设计参考(TI公司).pdf
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1、 Design Note DN031 SWRA328 Page 1 of 55 CC-Antenna-DK and Antenna Measurements Summary By Richard Wallace Keywords 169 MHz(136 240 MHz)Antenna 315 MHz(273 348 MHz)Antenna 433 MHz(387 510 MHz)Antenna 868 MHz(779 960 MHz)Antenna 915 MHz(779 960 MHz)Antenna 2440 MHz Antenna PCB Antenna Wire Antenna Cer
2、amic Chip Antenna CC-Antenna-DK Dual Band Antenna(868&2440 MHz)Mitsubishi Chip Antenna Pulse Chip Antenna Helical Wire Antenna Pulse Helical Wire Antenna 1 Introduction The main purpose of the CC-Antenna-DK is to ease the decision for which type of low cost antenna can be implemented as well as give
3、 an estimation of the performance that can be achieved.The frequency range of the antennas is from 136 MHz to 2480 MHz.The A4 sized PCB panel contains 16 different boards;13 antenna designs and 3 boards for calibration purposes.Each board has been v-cut and can be snapped out of the PCB panel.All an
4、tennas are tuned for connecting to an EM board on the EB platform.A matching network is used on each antenna design so the antenna boards can matched for other GND sizes than the EB board.Additionally,the ambition with this document is to collect the various antenna measurements that have been perfo
5、rmed and to compare the results obtained in an overview format.Terminology,antenna characteristics,fundamentals of antenna design,and measurement procedures are covered in the Antenna Selection Guide 18.For each antenna,a CTIA measurement summary is provided in this report with a link to the full me
6、asurement CTIA report.DN6xx is designated for CTIA measurement reports.Choosing the correct antenna for the application is crucial if the optimum range is to be achieved.Similarly,for a given distance,the power can be reduced on the transmitter side if the optimum antenna is chosen.Antennas are cate
7、gorized under the operating frequency(169 MHz,315 MHz,433 MHz,868/915 MHz or 2.44 GHz)and then the type of antenna(PCB Antennas,Chip Antennas,and Wire Antennas).The main focus is on PCB,Wire and Chip antennas,since these are mainly used in high volume products.Design Note DN031 SWRA328 Page 4 of 55
8、3 CC-Antenna-DK Rev 1.0.0.3.1 Board Description The CC-Antenna-DK PCB panel contains 16 different boards;13 antenna designs and 3 boards for calibration purposes.Each board has been v-cut and can be snapped out of the PCB panel,shown in Figure 1.Each board has a height of 95 mm and a width of 20 mm
9、to 45 mm.The PCB is 1.6 mm thick and has a dielectric of 4.2.The schematic(PDF),layout(PDF and gerbers),PCB stack-up(PDF)are provided in the CC-Antenna-DK documentation in the zip file 19.Figure 1:CC-Antenna-DK Board Showing Top Metal Layer,Silkscreen and V-cut Track All Low Power Wireless chips hav
10、e their own specific reference designs.Each reference design is implemented on an Evaluation Module(EM).Figure 2 shows a typical EM that is used for CC2500 ref design.Figure 2.Picture of CC2500 Evaluation Module(EM)Design Note DN031 SWRA328 Page 5 of 55 The EM board is inserted onto the main Evaluat
11、ion Board platform so the reference design implemented on the EM can be evaluated.The EM board is inserted onto the top,right side of the SmartRF04EB board as can be seen in Figure 3.Figure 3.Picture of SmartRF04EB Evaluation Board(EB)All antennas have been measured and tuned for connecting to an EM
12、 board inserted onto an EB board unless other specified;this is illustrated in Figure 4.Figure 4:Connectivity of Antenna Board#6 to a CC1101 EM Board on the EB Platform Design Note DN031 SWRA328 Page 6 of 55 A matching network is used on each antenna design so the antenna boards can matched for othe
13、r GND sizes than the EB board,refer to Figure 5.Figure 5:CC-Antenna-DK Panel Picture Sections 3.1.1 to 3.1.16 show the top metal layer in blue and the bottom layer in red.The efficiency of the antenna(868 MHz)is normally increased when used as a stand alone board.The lower frequencies(433 MHz)requir
14、e a larger GND plane/antenna to achieve high total radiated power(TRP).Two types of antenna(board 6,3.1.6 and board 7,3.1.7)have been chosen to illustrate that the TRP is increased when used as a stand alone compared to using the antennas on the EM&EB platform.Design Note DN031 SWRA328 Page 7 of 55
15、3.1.1 Board#1:“Short”Calibration Board Figure 6:Board#1 “Short”Calibration Board Size Width(mm)Height(mm)PCB Board 20 95 GND 18 63 BOM Ref.Designator Part Number Value -Table 1:PCB Size and BOM for Board#1 “Short”Calibration Board Three boards have been provided for calibration purposes;OPEN(3.1.9),
16、SHORT(3.1.1),and 50 ohm LOAD(3.1.2).These boards are mainly used when working with a network analyzer.Design Note DN031 SWRA328 Page 8 of 55 3.1.2 Board#2:“Load”Calibration Board Figure 7:Board#2 “Load”Calibration Board Size Width(mm)Height(mm)PCB Board 20 95 GND 18 63 BOM Ref.Designator Koa Part Nu
17、mber Value R21 RK73H1ETTP1000F 100 ohm R22 RK73H1ETTP1000F 100 ohm Table 2:PCB Size and BOM for Board#2 “Load”Calibration Board Three boards have been provided for calibration purposes;OPEN(3.1.9),SHORT(3.1.1),and 50 ohm LOAD(3.1.2).These boards are mainly used when working with a network analyzer.D
18、esign Note DN031 SWRA328 Page 9 of 55 3.1.3 Board#3:Mitsubishi Chip Antenna 868 MHz Figure 8:Board#3:Mitsubishi Chip Antenna 868 MHz Size Width(mm)Height(mm)PCB Board 30 95 GND 28 63 BOM Ref.Designator Part Number Value A3 MITSUBISHI AMD1103-ST01T-Z31 NC-Z32 Murata LQG15HS22NJ02D 22 nH Z33 KOA RK73Z
19、1ETTP 0 ohm Table 3:PCB Size and BOM for Board#3:Mitsubishi Chip Antenna 868 MHz Pros:Good BW and easy to match.Design Note DN031 SWRA328 Page 11 of 55 3.1.4 Board#4:Pulse Chip Antenna 868 MHz Figure 10:Board#4:Pulse Chip Antenna 868 MHz Size Width(mm)Height(mm)PCB Board 35 95 GND 33 93 BOM Ref.Desi
20、gnator Part Number Value A4 PULSE W3013-Z41 KOA RK73Z1ETTP 0 ohm Z42 NC-Z43 Murata GRM1555C1H8R2CZ01D 8.2 pF Table 4:PCB Size and BOM for Board#4:Pulse Chip Antenna 868 MHz Pros:Ability to place the antenna in the middle of a GND plane at the edge of the board instead of the traditional placement at
21、 top corner of a board.Good TRP efficiency when matched correctly.Cons:Difficult to match with external discrete network.The main matching parameter is the distance to the GND around the antenna.If this distance is incorrect,then a new PCB spin is required to tune the antenna to the desired frequenc
22、y.Low BW.Design Note DN031 SWRA328 Page 13 of 55 3.1.5 Board#5:Large Flexi Antenna 868 MHz Figure 12:Board#5:Large Flexi Antenna 868 MHz Size Width(mm)Height(mm)PCB Board 45 95 GND 43 63 BOM Ref.Designator Part Number Value Z51 Murata GRM1555C1H6R2CZ01D 6.2 pF Z52 Murata LQG15HS5N6S02D 5.6 nH Z53 NC
23、-Z54 KOA RK73Z1ETTP 0 ohm Table 5:PCB Size and BOM for Board#5:Large Flexi Antenna 868 MHz Pros:No simulations required providing that a network analyzer is available for tuning of the antenna via the match network.Reasonable BW performance and good TRP efficiency.Cons:Usage of discrete components i
24、n antenna matching is compulsory.Design Note DN031 SWRA328 Page 15 of 55 3.1.6 Board#6:Dual Band Antenna 868 MHz&2440 MHz Figure 14:Board#6:Dual Band Antenna 868 MHz&2440 MHz Size Width(mm)Height(mm)PCB Board 45 95 GND 43 63 BOM Ref.Designator Murata Part Number Value Z61 LQG15HS10NJ02D 10 nH Z62 GR
25、M1555C1H2R7CZ01D 2.7 pF Z63 NC-Table 6:PCB Size and BOM for Board#6:Dual Band Antenna 868 MHz&2440 MHz Pros:Dual band,868 MHz and 2440 MHz.Excellent TRP for both 868 MHz and 2440 MHz.Good BW at 868 MHz and excellent BW at 2440 MHz.Design Note DN031 SWRA328 Page 18 of 55 3.1.7 Board#7:Inverted F-Ante
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