By Colotti J.
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Die Radio-Frequenz-Identifikation (RFID) dient seit etwa 15 Jahren zur Identifikation von Personen, Objekten und Tieren. Mit der inzwischen intestine entwickelten Technologie können heute Rationalisierungen in vielen Wirtschaftsbereichen erreicht werden. Das Buch bietet eine Darstellung bestehender Anwendungen und Technologiegrundlagen sowie eine Beschreibung der Möglichkeiten und Grenzen von RFID.
Das Buch erläutert anhand zahlreicher Praxisbeispiel die Grundlagen der RFID-Technologie, sowie deren Einsatzgebiete. Die Autoren geben Antworten auf die wichtigsten Fragen und veranschaulichen gleichzeitig die Möglichkeiten der Technologie.
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Extra resources for Analog,RF and EMC considerations in printed wiring board design
Example text
010 in ) R DC = 0 . 3 Ω (0 . 0007 in )(0 . 005 in ) A t w Skin Depth δ = δ = δ = Revision 4 ρ π fµ 0 •Current density drops to 37% (1/e) •Ignore if t<2δ 0 . 0172 µ Ω m = 660 nm = 0 . 03 mils −7 Ω s π (10 GHz ) 4π x10 m 0 . 0172 µ Ω m = 21 µ m = 0 . 8 Gbps ♦ 36” trace length 5 FR4 RO4350 Er 4 3 100 1000 2000 10000 Frequency in MHZ Revision 4 Copyright Telephonics 2002-2005 40 Mitigation of Dispersion ♦ More Stable Dielectric - Option for new designs ♦ Pre-Emphasis Filter - Option for new designs or design upgrade ♦ Equalizer - Option for new designs or design upgrade - Maxim MAX3784 (40” length, 6 mil, FR4, 5 Gbps) Revision 4 Copyright Telephonics 2002-2005 41 Coupling ♦ Traces run in close proximity will couple ♦ Coupling is determined by geometry - trace separation, distance to ground(s) & parallel length - peaks at λ/4 and below λ/4 slope is 20 dB/decade 30 L 15 11 Revision 4 30 11 Notes: 1.
0230 1 . 1564 0 . 35 b−t Copyright Telephonics 2002-2005 31 Impedance Examples ♦ Symmetrical Strip-Line ♦ Asymmetrical Strip-Line ♦ Micro-Strip 50 Ω, 11 mils wide (30 mil dielectric) 50 Ω, 9 mils wide (10+20=30 mil dielectric) 50 Ω Micro-Strip, 54 mils wide (30 mil dielectric) Notes: 1. Copper: 1 oz, electro-deposited 2. 503 FR4 dielectric loss exceeds copper loss at 1 GHz Notes: 1. Copper: 1 oz, electrodeposited, 10 mil width, 50 Ohms, strip-line 2. 025, height 28 mils 3. 004, height 22 mils 4.
0007 in )(0 . 005 in ) A t w Skin Depth δ = δ = δ = Revision 4 ρ π fµ 0 •Current density drops to 37% (1/e) •Ignore if t<2δ 0 . 0172 µ Ω m = 660 nm = 0 . 03 mils −7 Ω s π (10 GHz ) 4π x10 m 0 . 0172 µ Ω m = 21 µ m = 0 . 8 Gbps ♦ 36” trace length 5 FR4 RO4350 Er 4 3 100 1000 2000 10000 Frequency in MHZ Revision 4 Copyright Telephonics 2002-2005 40 Mitigation of Dispersion ♦ More Stable Dielectric - Option for new designs ♦ Pre-Emphasis Filter - Option for new designs or design upgrade ♦ Equalizer - Option for new designs or design upgrade - Maxim MAX3784 (40” length, 6 mil, FR4, 5 Gbps) Revision 4 Copyright Telephonics 2002-2005 41 Coupling ♦ Traces run in close proximity will couple ♦ Coupling is determined by geometry - trace separation, distance to ground(s) & parallel length - peaks at λ/4 and below λ/4 slope is 20 dB/decade 30 L 15 11 Revision 4 30 11 Notes: 1.