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

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CHAPTER 4 IMPLEMENTATION AND EXPERIMENTAL RESULTS Antennas simulated in Chapter 3 were constructed on FR4 substrate. After connectorizing the feed structure with SMA connectors, initial response was measured using 8510C Vector Network Analyzer. There was some discrepancies which were attributed to uncertainties of the FR4 substrate's dielectric permittivity and possible errors during the simulations. During measurements for S 11- the input reflection coefficient minimal additional tuning in terms of adding metal tape on the dipole arms was carried out to retune the operating frequency to be centered at 915 MHz. Simulation results served as a good benchmark for constructing the antennas. Furthermore, Negative Impedance Converter (NIC) was constructed using variable capacitor as a tuning element. The results of this experimental investigation is outlined below. For the NIC implementation of Antenna Model-1 Si1031R — Vishay P-Channel 20- V (D-S) MOSFET [19] is used as the input stage transistor (Q1) and Si1032R — Vishay N-Channel 1.5-V (G-S) MOSFET [20] is used as the output stage transistor (Q2). As the capacitor (C1), Johanson MFG Corp Thin-Trim Capacitor Kit JK-942SL, 9402-6SL-1 (6.0 — 25 pF Yellow) is used [21]. 4.1 Antenna Model-1 With And Without Integrated Nic 4.1.1 Antenna Model-1 without Integrated NIC Constructed antenna was measured and after tuning process involving addition of copper tape on dipole's arms, the response was measured at 915 MHz. The depth of the 31
32 resonance notch corresponding to log I S11 I observed to be at -30.434 dB. The physical antenna and its measurement results are shown in Figures 4.1 and 4.2. Figure 4.1 Constructed Antenna Model-1 Figure 4.2 Measured Input Reflection Coefficient Response log I S11 I versus f
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 38 and 39: 25 Figure 3.8 Radiation Patterns fo
Page 40 and 41: 27 Figure 3.11 HFSS Antenna Impedan
Page 42 and 43: 29 Antenna impedance at resonance f
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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