Non-foster matching of an RFID antenna - New Jersey Institute of ...

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25 Figure 3.8 Radiation Patterns for Antenna Model-2. 3.3 Antenna Model-3 Antenna Model-3 is the expanded version of Antenna Model-2 with additional air filled back-up cavity, elevated from the ground plane. This modification is supposed to improve the gain by radiating only in the forward direction, thus increasing the range of the antenna comparing to antennas in Model-1 and Model-2 as shown in Figure 3.9. Antenna Model-3 is also tuned for 915 MHz resonance frequency. Minimum log I S11 I is realized at resonance frequency yielded notch depth as —29.26 dB as can be seen in Figure 3.10:
26 Figure 3.10 The plot of log I S11 I versus the frequency. Antenna impedance at resonance frequency yielded (46.94-j1.33) S2 as shown in Figure 3.11. The radiation patterns of Antenna Model-3 are depicted in Figure 3.12:
Page 1 and 2: Copyright Warning & Restrictions Th
Page 3 and 4: ABSTRACT NON-FOSTER MATCHING OF AN
Page 6 and 7: APPROVAL PAGE NON-FOSTER MATCHING O
Page 8 and 9: To my beloved family, teachers and
Page 10 and 11: TABLE OF CONTENTS Chapter Page 1 IN
Page 12 and 13: LIST OF FIGURES Figure Page 1.1 RFI
Page 14 and 15: CHAPTER 1 INTRODUCTION Radio Freque
Page 16 and 17: 3 passive tags to be compatible wit
Page 18 and 19: 5 Figure 1.2 shows the time domain
Page 20 and 21: 7 railroad at each previously defme
Page 22 and 23: 9 proportional to the tag's operati
Page 24 and 25: 11 • Antenna: This can be in the
Page 26 and 27: 13 Balun is a type of electrical tr
Page 28 and 29: 15 reader's antenna aperture, and t
Page 30 and 31: 17 radiation resistance. A frequenc
Page 32 and 33: 19 be driven into saturation by the
Page 34 and 35: 21 3.1 Antenna Model-1 Antenna Mode
Page 36 and 37: 23 3.2 Antenna Model-2 Antenna Mode
Page 40 and 41: 27 Figure 3.11 HFSS Antenna Impedan
Page 42 and 43: 29 Antenna impedance at resonance f
Page 44 and 45: CHAPTER 4 IMPLEMENTATION AND EXPERI
Page 46 and 47: 33 4.1.2 Antenna Model-1 with Integ
Page 48 and 49: 35 equal to -19.374 dB. The produce
Page 50 and 51: 37 Figure 4.11 Smith Chart of Anten
Page 52 and 53: APPENDIX A MOSFET PSPICE MODELS Si1
Page 54 and 55: 41 PSpice 9.1 Student Version, ORCA
Page 56 and 57: 43 Each method has its own advantag
Page 58 and 59: APPENDIX D PRINTED CIRCUIT BOARD DE
Page 60 and 61: 47 • On 2003-01-01 ManiaBarco Gmb
Page 62 and 63: REFERENCES 1. Wikipedia.org, Radio-

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