Future Work

Based on the circuit structures developed in this report, there are some possible applications to be implemented as briefly discussed in the following.

Since the N-push harmonic oscillator combines the output harmonic signal in passive circuits, it is suitable for achieving a high power and high-order harmonic signal source. However, oscillating output power at fundamental frequency should be large enough to drive the voltage-clamping circuit into its deep nonlinear region for high-order harmonic operation. Switch amplifier structure is another solution for its high efficiency and high nonlinearity.

For collision avoidance system, retro-directive antenna can be applied as tracking targets. Moving vehicles follow the desired routs by monitoring the reflected signals from these tracking targets around the routs. As for the application of point to point communications, the phase conjugation circuit is capable of extracting the desired carrier signals in each antenna elements by phase locked loops with proper loop filters even though the transmitted signal is modulated.

In wireless communications, bandwidth seems to be the most valuable resource. Using the beam-scanning and polarization-agile antenna array, the communication capacity is increased by lowering the co-channel interference. The resulting lower output power may further loose the specifications of output power and linearity in the RF hardware design.

[1] Y. Qian, and T. Itoh, “ Progress in active antennas and their applications,”

IEEE Trans. Microwave Theory Tech., vol. MTT-46, no, 11, pp. 1891-1900, November 1998.

[2] J. A. Navarro and K. Chang, Integrated active antennas and spatial power combining, John Wiley & Sons, Inc., 1996.

[3] R. A. York and T. Itoh, “Injection- and phase-locking techniques for beam control,” IEEE Trans. Microwave Theory Tech., vol. MTT-46, no. 11, pp.

1920-1929, November 1998.

[4] P. Liao and R. A. York, “A new phase-shifterless beam scanning technique using arrays of coupled oscillators,” IEEE Trans. Microwave Theory Tech., vol. MTT-41, no. 10, pp. 1810-1815, October 1993.

[5] R. A. York, P. Liao, and J. J. Lynch, “Oscillator array dynamics with broadband n-port coupling networks,” IEEE Trans. Microwave Theory Tech., vol. MTT-42, no. 11, pp. 2040-2045, November 1994.

[6] P. Liao and R. A. York, “A six-element beam-scanning array,” IEEE Microwave Guided Wave Lett., vol. 4, no. 1, pp. 20-22, April 1994.

[7] S. Nogi, M. Sanagi, M. Sono, and F. Miyake, “Injection signal controlled active phased array with a frequency shifted end element,” 1997 APMC, vol.

3, pp. 2-5, December 1997.

[8] R. J. Pogorzelski, P. F. Maccarini, and R. A. York, “Continuum modeling of the dynamics of externally injection-locked coupled oscillator arrays,” IEEE Trans. Microwave Theory Tech., vol. MTT-47, no. 4, pp. 471-478, April 1999.

[9] R. J. Pogorzelski, “Two-dimensional array beam scanning via externally and mutually coupled oscillators,” IEEE Trans. Antenna Propagat., vol. AP-49, no. 2, pp. 243-249, February 2001.

[10] R. J. Pogorzelski, “A two-dimensional coupled oscillator array,” IEEE Microwave Guided Wave Lett., vol. 10, no. 11, pp. 478-480, November 2000.

[11] R. J. Pogorzelski, “On the dynamics of two-dimensional array beam scanning via perimeter detuning of coupled oscillator array,” IEEE Trans.

Antenna Propagat., vol. AP-49, no. 2, pp. 234-242, February 2001.

[12] van der Pol, “Forced oscillation in a circuit with nonlinear resistance,” Phil.

Mag., vol. 3, pp. 65-80, January 1927.

[13] R. Adler, “A study of locking phenomena in oscillators,” Proc. IEEE, vol.

61, no. 10, pp. 1380-1385, October 1973.

[14] K. Kurokawa, “Injection locking of microwave solid-state oscillators,” Proc.

IEEE, vol. 61, no.10, pp. 1386-1410, October 1973.

[15] C. C. Huang and T. H. Chu, “Analysis of MESFET injection-locked

oscillators in fundamental mode of operation,” IEEE Trans. Microwave Theory Tech., vol. MTT-42, no. 10, pp. 1851-1857, October 1994.

[16] B. S. Hewitt, “The evolution of radar technology into commercial systems,”

1994 IEEE MTT-S Int. Microwave Symp. Dig., vol. 2, pp. 1271-1274, May 1994.

[17] M. Chryssomallis, “Smart antennas,” IEEE Antennas Propagat. Mag., vol.

42, no. 3, pp. 129-136, June 2000.

[18] Y. Zhou, P. C. Yip, and H. Leung, “Tracking the direction of arrival of multiple moving targets by passive array: algorithm,” IEEE Trans. Signal Processing, vol. 47, no. 10, pp. 2655-2666, October 1999.

[19] R. C. Hansen, Phase array antennas, John Wiley & Sons, Inc., 1998.

[20] A. W. Love, Reflector antennas, IEEE Press, 1978.

[21] J. Birkeland and T. Itoh,” A 16-element quasi-optical FET oscillator power combining array with external injection locking,” IEEE Trans. Microwave Theory Tech., vol. MTT-40, no. 3, pp. 475-481, March 1992.

[22] J. Lin, S. T. Chew, and T. Itoh, ”A unilateral injection-locking type active phased array for beam scanning,” IEEE MTT-S Int. Microwave Symp. Dig., pp. 1231-1234, May 1994.

[23] K. D. Stephen and W. A. Morgan, “Analysis of inter-injection-locked oscillators for integrated phased arrays,” IEEE Trans. Antenna Propagat., vol. AP-35, no. 7, pp. 771-781, July 1987.

[24] A. Alexnian, H. C. Chang, and R. A. York, “Enhanced scanning range in coupled oscillator arrays utilizing frequency multipliers,” 1995 IEEE AP-S

Int. Symp., vol. 2, pp. 1308-1310, 1995.

[25] S. C. Yen, T. H. Chu, “A Nth-harmonic oscillator using an N-push coupled oscillator array with voltage-clamping circuits”, 2003 IEEE MTT-S Int.

Microwave Symp., June 2003.

[26] S. C. Yen, T. H. Chu, “A retro-directive antenna array using phase conjugation circuit with subharmonically injection locked self-oscillating mixers”, IEEE Trans. Antenna Propagat., vol. AP-52, no. 3, March 2004.

[27] S. C. Yen, T. H. Chu, “A retro-directive antenna array using phase conjugation circuit with subharmonically injection locked self-oscillating mixers,’ 2002 32nd European Microwave Conference Proc., September 2002.

[28] S. C. Yen, T. H. Chu, “Phase conjugation array using subharmonically injection locked self-oscillating mixers,’ 2001 IEEE AP-S Int. Symp., pp.

692-695, July 2001.

[29] S. C. Yen, T. H. Chu, “Application of mutually coupled oscillators on beam-scanning and polarization-agile antenna array”, 2003 IEEE AP-S Int.

Symp., June 2003.

[30] S. C. Yen, T. H. Chu, “Beam-scanning and polarization-agile antenna array using mutually coupled oscillating doublers,” 2002 APMC Proc., November 2002.

[31] Y. R. Yang and T. H. Chu, “Locking performance analysis of MESFET subharmonically injection locked oscillators,” IEEE Trans. Microwave Theory Tech., vol. MTT-47, no. 7, pp. 1014-1020, July 1999.

[32] C. R. Poole, “Subharmonic injection locking phenomena in synchronous oscillators,” Electronics Lett., vol. 26, no. 11, pp. 1748-1750, October 1990.

[33] R. S. Chen, “Analysis of nonlinear microwave oscillator with subharmonically injected signal,” 1996 4th Int. Conference Millimeter Wave and Far Infrared Science and Technology, pp. 83-87, August 1996.

[34] J.J. Goedbloed, M. T. Vlaardingerbroek, “Theory of noise and transfer properties of IMPATT diode amplifiers,” IEEE Trans. Microwave Theory Tech., vol. MTT-25, no. 4, pp. 324-332, April 1977

[35] S. F. Paik, P. J. Tanzi, and D.J. Kelley, “IMPATT-diode power amplifiers for digital communication systems,” IEEE Trans. Microwave Theory Tech., vol.

MTT-21, no. 11, pp. 716-720, November 1999.

[36] H. A. Willing, “A two-stage IMPATT-diode amplifier,” IEEE Trans.

Microwave Theory Tech., vol. MTT-21, no. 11, pp. 707-716, November 1999.

[37] H. C. Chang, X. Cao, U. K. Mishra, and R.A. York, “Phase noise in coupled oscillator arrays,” 1997 IEEE MTT-S Int. Microwave Symp. Dig., vol. 2, pp. 1061-1064, June 1997

[38] H. C. Chang, X. Cao, U. K. Mishra, and R. A. York, “Phase noise in coupled oscillators: theory and experiment,” IEEE Trans. Microwave Theory Tech., vol. MTT-45, no. 5, pp. 604-615, May 1997.

[39] H. C. Chang, X. Cao, M. J. Vaughan, U. K. Mishra, and R. A. York, “Phase noise in externally injection-locked oscillator arrays,” IEEE Trans.

Microwave Theory Tech., vol. MTT-45, no. 11, pp. 2035-2042, November 1997.

[40] F. X. Sinnesbichler, H. Geltinger, and G. R. Olbrich, "A 38-GHz push-push oscillator based on 25-GHz f_t BJTs," IEEE Microwave Guided Wave Lett., vol. 9, pp. 151-153, April 1999.

[41] F. X. Sinnesbichler, H. Geltinger, and G. R. Olbrich, "A Si/SiGe HBT dielectric resonator push-push oscillator at 58 GHz," IEEE Microwave Guided Wave Lett., vol. 10, pp. 145-147, April 2000.

[42] S. Kudszus, W. H. Haydl, H. Tessmann, W. Bronner, and M. Schlechtweg,

“Push-push oscillators for 94 and 140 GHz applications using standard

pseudomorphic GaAs HEMTs,” 2001 IEEE MTT-S Int. Microwave Symp.

Dig., vol. 3, pp. 1571-1574, May 2001.

[43] A. Schott, H. Kuhnert, F. Lent, J. Hilsenbeck, J. Wurfl, and W. Heinrich,

“38 GHz push-push GaAs-HBT MMIC oscillator,” 2002 IEEE MTT-S Int.

Microwave Symp. Dig., vol.2 , pp. 839-842, June 2002

[44] Y. L. Tang, and H. Wang, “Triple-push oscillator approach: theory and experiments,” IEEE J. Solid-State Circuits, vol. 26, no. 10, October 2001.

[45] S. A. Maas, Nonlinear Microwave Circuits, Norwood: Artech House, 1988.

[46] S. N. Andre and D. J. Leonard, “An active retrodirective array for satellite communications,” IEEE Trans. Antennas Propagat., vol. AP-12, no. 2, pp.

181-186, February 1964.

[47] Y. Chang, H. R. Fetterman, L. Newberg, and S. K. Panaretos, “Microwave phase conjugation using antenna arrays,” IEEE Trans. Microwave Theory

Tech., vol. MTT-46, no. 11, pp. 1910-1919, November 1998.

[48] S. L. Karode and V. F. Fusco, “Self-tracking duplex communication link using planar retrodirective antennas,” IEEE Trans. Antennas Propagat., vol.

AP-47, no. 6, pp. 993-1000, June 1999.

[49] C. W. Pobanz and T. Itoh, “A microwave noncontact identification transponder using subharmonic interrogation,” IEEE Trans. Antennas Propagat., vol. AP-43, no. 7, pp. 1673-1679, July 1995.

[50] C. Y. Pon, “Retrodirective array using the heterodyne technique,” IEEE Trans. Antennas Propagat., vol. AP-12, no. 2, pp. 176-180, February 1964.

[51] G. Gonzalez and O. J. Sosa, “The design of a series-feedback network in a transistor negative-resistance oscillator,” IEEE Trans. Microwave Theory Tech., vol. MTT-47, no. 1, pp. 42-47, January 1999.