A self-correcting quadrature voltage controlled oscillator (QVCO) with phase correcting loop is proposed. It comprises the QVCO core and phase correcting loop, which corrects the quadrature phase error. Two LC VCOs, buffers, and phase shifters are coupled in circular configuration to achieve IQ symmetry. This paper introduces the idea of realizing QVCO with low phase noise and accurate quadratu...

An optical phased array with a record spot size of 0.85°×0.18° and steering range of 46°×36° is demonstrated. Grouped cascaded phase shifters are utilized. Beam powers of 1mW and a free-space data link are achieved. OCIS codes: (130.3120) Integrated optics devices; (130.6750) Systems; (130.6622) Subsystem integration and techniques.

This paper presents the design and realization of a low power, high speed circuit used to actuate RF MEMS (Radio Frequency MicroElectroMechanical Systems) based phase shifters at 60GHz.The phase shifter are used to realize beam forming reconfigurable antenna for high data rate WPAN (Wireless Personal Area Network) applications. RF MEMS commonly have high actuation voltages usually obtained with...

This paper presents a novel approach to reducing radar cross section (RCS) using 2D multi-layer Van Atta array based on the phase cancellation principle. By controlling of transmission lines wideband shifters, proposed can achieve significant RCS reduction at wide frequency range 8 GHz 11 GHz. Both theoretical calculations and experimental measurements were conducted evaluate performance with s...

A compact design based on high-Q microdisk resonators is proposed for low-power modulation where anti-symmetric operation of two phase shifters leads to significant insertion loss reduction. Operation analysis and design procedure are presented. OCIS codes: (130.3120) Integrated optics devices; (230.5750) Resonators; (130.4110) Modulators.

An innovative iterative search method called the synthetic phase-shifting (SPS) algorithm is proposed. This search algorithm is used for maximum-likelihood (ML) estimation of a wavefront that is described by a finite set of Zernike Fringe polynomials. In this paper, we estimate the coefficient, or parameter, values of the wavefront using a single interferogram obtained from a point-diffraction ...

RF Vector Modulator enables independent control of a narrowband RF signal amplitude and phase. Unfortunately practical realization of an analog vector modulator suffers from misbalances and imperfections in the I and Q signal paths. Use of a feed-forward based calibration can compensate for them and significantly improve RF performance and control accuracy of a real vector modulator. Achieved i...

This paper describes a new approach to adaptive phase-only nulling with phased arrays. A genetic algorithm adjusts some of the least significant bits of the beam steering phase shifters in order to minimize the total output power. Using a few bits for nulling speeds convergence of the algorithm and limits pattern distortions. Various results are presented to show the advantages and limitations ...