Novel Phase Noise Reduction Method for CPW-Based Microwave Oscillator Circuit Utilizing a Compact Planar Helical Resonator

2011

This letter presents two compact L‐type spurline and meander spurline resonators and their application to low‐phase noise oscillators. These resonators have a bandstop characteristic that can be used in the series feedback oscillator topology. Both miniaturized resonators consist of a defected L‐type spurline and a meander spurline with inductive characteristics and a loaded stub with capacitive characteristics. The structure of resonators reduces the required the circuit area as well as the cost. The oscillators, using the spurline and the meander spurline resonators, show excellent phase noise performances of −96.23 dBc/Hz and −103.23 dBc at a 100 kHz offset from the carrier frequency of 9.0 GHz and 9.2 GHz with an output power of 14.47 dBm and 15.23 dBm, respectively. The later oscillator exhibited better phase noise characteristics due to the high Q value of the defected meander spurline resonator. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:543–547, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25803

Section: Resultsmentioning

confidence: 83%

Low‐phase noise oscillator using spurline resonator for I‐band applications

2011

“…The output power and phase noise at the 100 kHz offsets of this work showed the best results among those Refs. 9–14, as seen in Table 1.…”

Section: Resultsmentioning

confidence: 98%

“…Various kinds of sensors based on HiBi-FLMs have been realized, such as temperature sensors, optical current sensors, strain sensors, pressure sensors, liquid level sensors, refractive index sensors, biochemical sensors, and multiparameter measurement [3][4][5][6][7][8][9][10][11]. However, most HiBi-FLM sensors are based on monitoring the resonant wavelength variation of FLMs [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Spurline resonators design and its implementation to microwave oscillators

2011

In this article, two compact L‐type spurline and symmetric meander spurline resonators were designed and implemented into low phase‐noise microwave oscillators for X‐band application. These resonators have a bandstop characteristic that can be used in the series feedback oscillator topology. Both of these miniaturized resonators are designed with different spurline structures, the first one being an L‐type spurline and the other one a meander spurline. Both resonators exhibited inherently inductive characteristics and had a loaded stub with capacitive characteristics. The oscillators using the spurline and the symmetric meander spurline resonators show excellent phase‐noise performances of −96.23 dBc/Hz and −104.39 dBc at a 100 kHz offset from the carrier frequency of 9.2 and 9.0 GHz with an output power of 12.47 and 16.42 dBm, respectively. The latter oscillator exhibited better phase‐noise characteristics due to the high Q value of the symmetric meander spurline resonator. The figure of merit of the first oscillator achieved −174, and the latter achieved −181.36. The size of the oscillator is reduced by constructing a parallel combination of the open stub at the source and the DC voltage supply at the drain © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:171–176, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26461

“…The results of FoM found to be better due to it possessing greater capacitive and inductive coupling effects; these coupling effects also lead to its higher Q value. The main parameters of the microwave oscillators are its phase noise and output power at the given frequency, therefore, these parameters are compared to other recently published literatures [8–13], which are tabulated in Table 1. This work showed better performance among those studies.…”

Section: Resultsmentioning

confidence: 99%

Microwave oscillator design using folded T‐type slot resonator for X‐band applications

Maharjan

2012

In this article, Microwave oscillator was designed, fabricated, and characterized using the folded T‐type slot resonator for X‐band applications. The miniaturized resonator was designed by terminating the slot lines at both ends of the T‐structure. The simulation and experimental results were compared and found a closed agreement between them. The oscillator using the folded T‐type slot resonator showed phase noise performances of −105.54 dBc/Hz at a 100 kHz offset from the carrier frequency of 8.5 GHz with an output power of 14.06 dBm. The oscillator exhibited better phase noise characteristic due to the high unloaded Q value of the folded T‐type slot resonator, which is considerably higher than that of miniaturized spurline resonators. The figure of merit of the oscillator achieved a −183.34 dBc/Hz. The feasibility of integrating that slot resonator in various monolithic microwave integrated circuit technologies can also be expected. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2817–2821, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27215