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Mixing Behavior of a Dual-Patch Active Antenna Oscillator at 1.2 GHz

Mixing Behavior of a Dual-Patch Active Antenna Oscillator at 1.2 GHz. Isaac Waldron* & Sergey Makarov Worcester Polytechnic Institute ECE Department Worcester, MA 01609. Outline. Motivation Oscillating Antenna Design Mixer Behavior of Active Oscillator Experimental Results

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Mixing Behavior of a Dual-Patch Active Antenna Oscillator at 1.2 GHz

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  1. Mixing Behavior of a Dual-Patch Active Antenna Oscillator at 1.2 GHz Isaac Waldron* & Sergey Makarov Worcester Polytechnic Institute ECE Department Worcester, MA 01609 2005 AP-S International Symposium on Antennas and Propagation

  2. Outline • Motivation • Oscillating Antenna Design • Mixer Behavior of Active Oscillator • Experimental Results • Mixing Model of Antenna Amplifier • Conclusion 2005 AP-S International Symposium on Antennas and Propagation

  3. Motivation • Follows work by Prof. Makarov and myself on the design of an amplifier-based active antenna oscillator. • Investigates the mixing behavior exhibited by the antennas of that work. 2005 AP-S International Symposium on Antennas and Propagation

  4. Oscillating Antenna Design 2005 AP-S International Symposium on Antennas and Propagation

  5. Oscillator Linear Model Oscillation prediction follows from Berkhausen criteria: 1 - A(s)H(s) = 0 or |A(s)H(s)| = 1, A(s)H(s) = 0 2005 AP-S International Symposium on Antennas and Propagation

  6. Oscillator Open-Loop Response The antenna will start to oscillate at approximately the frequency marked by the diamond; at this frequency, a signal traveling around the loop returns in phase. 2005 AP-S International Symposium on Antennas and Propagation

  7. Typical Antenna Setup 2005 AP-S International Symposium on Antennas and Propagation

  8. Spectrum 2005 AP-S International Symposium on Antennas and Propagation

  9. Locking Bandwidth • Locking bandwidth of about 100 kHz on each side of the center frequency was observed. • Holding bandwidth of about 200 kHz on each side of the center frequency was observed. 2005 AP-S International Symposium on Antennas and Propagation

  10. Phase Noise 2005 AP-S International Symposium on Antennas and Propagation

  11. Bias Tuning 2005 AP-S International Symposium on Antennas and Propagation

  12. Co-polar Radiation Pattern 2005 AP-S International Symposium on Antennas and Propagation

  13. Antenna Tuning • The oscillation frequency of the antenna linearly depends on the leading patch dimension. • It also depends on the ratio between the width and length of the patches. • Below a certain patch length, oscillations in the desired mode cease as the coupling between the antenna ports drops below a critical value. 2005 AP-S International Symposium on Antennas and Propagation

  14. Antenna Tuning 2005 AP-S International Symposium on Antennas and Propagation

  15. Conclusion • Oscillator designed from open-loop transmission. • Prototypes match predicted oscillation frequency. • Bias and geometric tuning were demonstrated. • Regions of operation were determined. 2005 AP-S International Symposium on Antennas and Propagation

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