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This paper presents the design and characterization of a miniaturized tunable bandpass filter utilizing high-Q ceramic coaxial resonators and commercially available RF-MEMS tunable digital capacitors. A proof-of-concept 2-pole tunable filter occupying only 10 × 10 mm2 is demonstrated with a frequency tuning range of 800–1100 MHz and bandwidth tuning range of 6–13%.
Wireless charging is a safe and clean technique of contactless charging over a wide range of power levels for portable electronic products. Although the market for wireless charging in Watts to tens of Watts is growing rapidly, the performance of such wireless charging products is still inferior when compared to those utilizing traditional charging, especially when the resonant frequencies are not...
Frequency tuning of aluminum nitride (AlN) micromechanical resonators has been demonstrated by reactance manipulation via termination with variable capacitors. Shunting one electrode with a variable capacitor in a 13 MHz fourth overtone length-extensional mode resonator effected resonator stiffening to yield a ∼600 ppm frequency shift. Tunability could be further increased by dedicating two electrodes...
A wideband Colpitts VCO using an analog tunable phase shifter as the frequency tuning component is presented. The tunable phase shifter is used as the resonator in a common collector Colpitts oscillator. An inductor is added in series with one of the feedback capacitors to avoid oscillation at higher order resonances of the phase shifter. The proposed VCO has a measured continuous frequency tuning...
A novel compact coupled planar resonator (CCPR) based VCO (voltage controlled oscillator) using mode-coupling technique was developed in response to expensive high Ceramic and SAW resonators based signal source for wireless communications. One of the problems related to the conventional Ceramic/SAW based resonators (with high Q and low phase noise) is the challenge for integration in IC form. Instead...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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