Novel oscillator incorporating a compact microstrip resonant cell

A novel transistor oscillator incorporating a compact microstrip resonant cell (CMRC) as its terminating resonance is proposed. Adjusting the dimensions of the cell, it is possible that the fundamental frequency can be positively fed back and the second harmonic negatively fed back at the input port of the oscillator. The fundamental output is enhanced with the second harmonic being suppressed. The output power of the proposed CMRC oscillator is 14.7 dBm at 2.5 GHz with 27.1 dB rejection of the second harmonic, outperforming the conventional microstrip termination with a 40% size reduction.

[1]  Gabriel M. Rebeiz,et al.  MM-wave tapered slot antennas on micromachined photonic bandgap dielectrics , 1996, 1996 IEEE MTT-S International Microwave Symposium Digest.

[2]  Tae-Yeoul Yun,et al.  One-dimensional photonic bandgap resonators and varactor tuned resonators , 1999, IMS 1999.

[3]  T. Itoh,et al.  A novel uniplanar compact PBG structure for filter and mixer applications , 1999, 1999 IEEE MTT-S International Microwave Symposium Digest (Cat. No.99CH36282).

[4]  Tatsuo Itoh,et al.  Broad-band power amplifier using dielectric photonic bandgap structure , 1998 .

[5]  Y. Qian,et al.  PBG-assisted gain enhancement of patch antennas on high-dielectric constant substrate , 1999, IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010).

[6]  Quan Xue,et al.  Novel 1-D microstrip PBG cells , 2000 .