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http://dx.doi.org/10.5515/KJKIEES.2010.21.1.083

A Ku-Band Hair-Pin Resonator Oscillator with a New Varactor Coupled Line Structure  

Choi, Kwang-Seok (Department of Electronic Engineering, Sogang University)
Won, Duck-Ho (Department of Electronic Engineering, Sogang University)
Yun, Sang-Won (Department of Electronic Engineering, Sogang University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.1, 2010 , pp. 83-89 More about this Journal
Abstract
In this paper, we propose a new varactor coupled line structure and design the VCO using the proposed structure. The proposed coupled line structure removes the reflected signals from the varactor diode using an added $\lambda$/4 transmission line. The frequency synthesizers are designed using the PLL technique at Ku-band. The synthesizer using the proposed coupled structure has 38 MHz frequency tuning range and -97 dBc/Hz phase noise characteristic at 100 KHz offset frequency. The measured results show improved tuning range as well as the improved phase noise characteristics compared to the conventional designs.
Keywords
Hair-pin Oscillator; Coupled Line; Varactor; Tuning Frequency; Phase Noise;
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