High efficiency and suppression harmonics oscillator using front coupled tapered CMRC

Abstract

This article presents a novel terminating network for microwave transistor oscillator.A front coupled tapered compact microstrip resonant cell (FCTCMRC) is inserted between the transistor and the input fundamental matching network as its terminating resonance. The fundamental frequency from the output can be connected in a positive feedback loop to the input port by tuning the dimensions of the proposed FCTCMRC. This feedback can simultaneously act as a negative feedback for the second harmonic frequency. The output at the fundamental frequency improved due to the second harmonic suppression. The proposed FCTCMRC is used to obtain as high a reflection coefficient as possible, while providing the oscillation condition with the incorporated microwave transistor. The measured results show 63.05% improvement suppression of the second harmonic using FCTCMRC in comparison with the conventional microstrip line. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1862–1866, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26943

Low conversion loss full E‐band seventh‐harmonic mixer with compact filter

“…The CMRC [7, 8] is adopted in this Letter as the lowpass filter for extracting the IF signal from the LO path. The CMRC filter consists of vertical thin lines and several parallel coupling thin lines which enhance the distributed series inductance (L) and shunt capacitance (C).…”

“…However, the LO even harmonics and the mixing products of the RF signal with the LO even harmonics are cancelled out by the single balanced configuration. The CMRC [7,8] is adopted in this Letter as the lowpass filter for extracting the IF signal from the LO path. The CMRC filter consists of vertical thin lines and several parallel coupling thin lines which enhance the distributed series inductance (L) and shunt capacitance (C).…”