Antenna technologies
Antenna technologies Current status trends Outlook to different antenna solutions, examples Summary, challenges for the future
Current status trends dual-band GSM tri-band GSM GPS quad-band GSM WCDMA (CDMA, div) GPS quad-band GSM WCDMA (CDMA, GPS div) WLAN WLAN UWB UWB Bluetooth Bluetooth DVB/H Bluetooth DVB/H RFID RFID AM AM/FM/RDS FM/RDS
Roadmap WHIP RETRACTABLE TELESCOPIC STRUCTURES SMALLER DIAMETER, DIMENSIONS AND MORE FUNCTIONALITY, LIKE SWIVEL/HINGE STRUCTURES OR AUTOMATIC MECHANICAL MOVEMENTS. MAGNETOSTRICTIVE METALS COULD BRING NEW FEATURES TO THESE TRADITIONAL STRUCTURES. GOOD RF PROPERTIES CAN BE USED IN NEW SYSTEMS LIKE UWB. HELICAL PWB FLEX PWB (MEANDER LINE) BALANCED SWISS ROLL 90 95 00 05 10
UWB ANTENNA SIMPLE THICK MONOPOLE OR A ELLIPTICAL DISK SWR 24 Oct 2003 09:14:41 CH1 S11 SWR 1 / REF 1 1 : 1. 9323 3. 000 000 000 GHz PRm Del 4 CH1 Markers Cor 2 : 2. 2307 6. 00000 GHz 3 : 2. 0935 9. 00000 GHz 4 : 10. 345 2. 00000 GHz starting from 3 GHz, Bandwidth is unlimited 1 2 3 START 2. 000 000 000 GHz STOP 11. 000 000 000 GHz
Roadmap (P)IFA LOOP SHEET METAL MID TECHNIQUES FLEX/FOIL FLEXIBLE TECHNIQUES INKS INSERT MOULDED PART FETs IML/IMD MEMS TUNING TUNING control RF FRONT END EXISTING ANTENNA TYPES ARE SUITABLE FOR A NUMBER OF SWITCHING SCHEMES. BAND-, MODE, CHANNEL SWITCHING. DIRECT, INDIRECT AND ELEMENT LEVEL SWITCHING 90 95 00 05 10
MODE switching Antenna type: PIFA Antenna size:30mm x 13mm x 5mm = 1.95cc Ground plane size: 100mm x 40mm
EGSM TX S 11 log MAG 3 db/ REF 0 db p Matching EGSM RX 1_:-2.6478 db CH1 S 11 log MAG 3 db/ REF 0 db p 1_:-13.97 db 880.000 000 MHz 925.000 000 MHz 2_:-5.07 db 915 MHz 3_:-3.7423 db 1.71 GHz 4_:-2.1949 db 1.99 GHz PRm Cor Del 2_:-1.3705 db 960 MHz 3_:-3.4736 db 1.71 GHz 4_:-1.8702 db 1.99 GHz 1 4 2 4 3 3 2 1 TART 400.000 000 MHz STOP 2 600.000 000 MHz START 400.000 000 MHz STOP 2 600.000 000 MHz
0,6 0,5 0,4 0,3 0,2 0,1 0 Realized (total) efficiency Efficiency 1000 1720 1750 1780 1810 1840 1870 1900 1930 1960 1990 Frequency [MHz] EGSM_TX EGSM_RX 970 940 910 880 850
Quad-band switchable antenna Antenna type: PIFA Antenna size:40mm x 17mm x 6mm Ground plane size: 100mm x 40mm
GSM850 Matching EGSM900 21 Jan 2004 09:31:47 21 Jan 2004 09:35:36 S 11 log MAG 3 db/ REF 0 db 1_:-3.6559 db CH1 S 11 log MAG 3 db/ REF 0 db 1_:-6.7553 db 824.000 000 MHz 880.000 000 MHz 2_:-3.4157 db 894 MHz 3_:-5.6251 db 1.71 GHz 4_:-5.5972 db 1.99 GHz PRm Cor Del 2_:-2.3529 db 960 MHz 3_:-6.5485 db 1.712 GHz 4_:-5.842 db 1.985 GHz 1 2 2 1 3 4 3 4 ART 400.000 000 MHz STOP 2 600.000 000 MHz START 400.000 000 MHz STOP 2 600.000 000 MHz
Realized (total) efficiency Efficiency Efficiency 0,7 0,6 0,5 0,4 0,3 0,2 0,1 EGSM900 GSM850 0 820 870 920 1710 1760 1810 1860 1910 1960 Frequency [MHz]
Roadmap CERAMIC (PATCH) LOOP HYBRID DRA CLEARLY NEW TYPES OF MATERIALS ARE NEEDED IN THE FUTURE ANTENNA SOLUTIONS AND ADVANCES IN PLATING, PRINTING CERAMIC, FERRITE ETC. MATERIAL TECHONOGIES ARE NEEDED BEFORE THEY CAN BE REALISED EFFECTIVELY. NEW MATERIALS MAY EVEN OPEN UP COMPLETELY NEW ANTENNA TYPES THAT HAVE NOT TRADITIONALLY BEEN USED IN PORTABLE DEVICES? FERRITES COMPLETELY NEW ANTENNA TYPES LIKE SLOT ANTENNAS? 90 95 00 05 10
Ceramic BT/GPS- chip antennas AS AN EXAMPLE LET'S LOOK AT SOME MAIN DIFFERENCES WHEN COMPARING A NORMAL IFA TO A CERAMIC LOADED ANTENNA
Ceramic BT/GPS- chip antennas Ceramic antenna FA-antenna same size, plastic support)
Ceramic BT/GPS- chip antennas Ceramic chip ant (12x3x2mm) Flex IFA (30x20x5mm) good radiation performance in compact size Antenna area Efficiency 80 % 70 % 60 % 50 % 40 % 30 % 20 % 10 % 0 % 1500 1520 1540 1560 1575 1590 1610 1630 1650 Freq. [MHz] 4,00 2,00 - -2,00-4,00-6,00-8,00 Maximum gain 1500 1520 1540 1560 1575 1590 1610 1630 1650 Freq. [MHz] PIFA (5x20x30mm) Cer ant (12x3x2mm) PIFA (5x20x30mm) Cer ant (12x3x2mm)
Ceramic BT/GPS- chip antennas immunity for loading objects Return loss / S11 Flex-PIFA Ceramic chip antenna Antenna underneath cover, against the tissue of the hand 10 Mar 2004 15:45:26 CH1 S 11 &M lo g MAG 5 db/ REF 0 db 2_:-1.1945 db 2 440.000 000 MHz 10 Mar 2004 15:31:33 CH1 S 11 &M log MAG 5 db/ REF 0 db 2_:-12.326 db 2 440.000 000 MHz PRm Cor 1_:-1.3386 db 2.4 GHz 3_:-1.0781 db 2.48 GHz PRm Cor 1_:-7.8584 db 2.4 GHz 3_:-3.7864 db 2.48 GHz 2 1 3 Hand loaded 3 1 2 Free space Free space Hand loaded CENTER 2 450.000 000 MHz SPAN 500.000 000 MHz CENTER 2 450.000 000 MHz SPAN 500.000 000 MHz Efficiency (free space) 80 % 70 % 60 % 50 % 40 % 30 % 20 % 10 % 0 % 2100 2300 2410 2430 2450 2470 2490 2600 2800 Freq. [MHz] Efficiency (hand loaded) 40 % 35 % 30 % 25 % 20 % 15 % 10 % 5 % 0 % 2100 2300 2410 2430 2450 2470 2490 2600 2800 Freq. [MHz] Flex- PIFA (ex. above) Cer chip ant Cer_ant (10x3x4mm) Flex_PIFA (14x9x4mm)
Ceramic BT/GPS- chip antennas igh isolation between other antennas) CER- chip antenna (10x3x4mm) Antenna underneath WCDMA antenna, Distance to flex 4mm. Total height (frame) 8mm S21: isolation to WCDMA antenna S21: isolation to GSM antenna CH1 S 21 &M log MAG 5 db/ REF 0 db PRm Cor 2 Apr 2004 05:36:19 3_:-19.638 db 1 575.000 000 MHz 1_:-20.134 db 1.57 GHz 2_:-19.309 db 1.58 GHz 4_:-44.893 db 1.359 GHz CH1 S 21 &M log MAG 5 db/ REF 0 db PRm Cor 2 Apr 2004 05:37:18 3_:-22.284 db 1 575.000 000 MHz 1_:-22.584 db 1.57 GHz 2_:-22.176 db 1.58 GHz 4_:-49.667 db 1.359 GHz 3 1 2 3 1 2 S21 max at 1665 MHz: -17,6 db CENTER 1 575.000 4 000 MHz SPAN 500.000 000 MHz CENTER 1 575.000 4 000 MHz SPAN 500.000 000 MHz
SUMMARY WHIP RETRACTABLE TELESCOPIC WHIP SMALLER DIAMETER, DIMENSIONS HELICAL PWB FLEX PWB (MEANDER LINE) BALANCED SWISS ROLL (P)IFA SHEET METAL MID TECHNIQUES FLEX/FOIL FLEXIBLE MID TECHNIQUES INKS INSERT MOULDED PART FETs IML/IMD MEMS CERAMIC (PATCH) LOOP HYBRID DRA LOOP FERRITES SLOT 90 95 00 05 10
SUMMARY Low cost, small size, flexible design are must, lifetimes getting shorter. Antenna markets growing because of non cellular systems Environmental and health issues (SAR) important (design & validation) Adaptive (arrays) / tuneable (software) / smart antennas coming available Lots of data downloading on terminal => reception quality important (diversity, MIMO) New Antenna technologies & materials coming Advanced ceramic/ferrite materials Semiconductors (FE integration, also audio and other functionality) New methods to enable effective 3D designs Antenna may also integrate into front-ends or part of mechanics material & process know-how
SUMMARY COMPLEXITY IS INCREASING INTERACTION, ISOLATION Complexity 4-band GSM, CDMA 3-bandGSM + WCDMA + GPS + BT AM DVB-H/T FM WLAN dual band T-DAB RFID UWB 2010
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