Low phase noise oscillator using a new planar hairpin resonator for X-band applications

This article proposed a new high loaded quality factor (QL) hairpin resonator with a combination of a stepped impedance resonator and single split ring resonator and its application to low phase noise oscillator for X-band applications.A new resonator has a good characteristic of S-parameter responses. The microwave oscillator is designed at 10 GHz that exhibited a low phase noise characteristic due to the high loaded QL of the new resonator. A series feedback network is used to generate the negative resistance to make oscillation. Experimental results of the microwave oscillator show the phase noise characteristic of 103.69 dBc/Hz at 100 kHz offset with output power of 15.56 dBm. The second harmonic suppression is 32.25 dBc, which is very important in wireless communication system. The figure of merit of the fabricated oscillator is 180 dBc/Hz. (c) 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:15081511, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27608