Results 161 to 170 of about 2,596 (216)
Some of the next articles are maybe not open access.
Achromatic optical phase shifter–modulator
Optics Letters, 2001We propose and demonstrate, theoretically and experimentally, a novel achromatic optical phase shifter-modulator based on a frequency-domain optical delay line configured to maintain zero group delay as variable phase delay is generated by means of tilting a mirror.
Zvyagin, A.V., Sampson, David
openaire +5 more sources
Phase shifter calibration in phase-shifting interferometry
Applied Optics, 1985This paper describes some practical methods to calibrate the phase shifter in phase-shifting interferometry (PSI). The phase shifter used in the experiment is a piezoelectric transducer (PZT) that has a nonlinearity of
Y Y, Cheng, J C, Wyant
openaire +2 more sources
IEEE Transactions on Microwave Theory and Techniques, 2007
A method with clear guidelines is presented to design compact planar phase shifters; with ultra-wideband (UWB) characteristics. The proposed method exploits broadside coupling between top and bottom elliptical microstrip patches via an elliptical slot located in the mid layer, which forms the ground plane.
openaire +4 more sources
A method with clear guidelines is presented to design compact planar phase shifters; with ultra-wideband (UWB) characteristics. The proposed method exploits broadside coupling between top and bottom elliptical microstrip patches via an elliptical slot located in the mid layer, which forms the ground plane.
openaire +4 more sources
Monolithic Phase Shifter Study
1987Abstract : Modeling and testing of monolithic coplanar waveguide (CPW) phase shifters using both optical and Schottky-contact control techniques have been performed. Simulation work on a periodically illuminated structure has been completed, showing that some improvement in performance may be possible, although with a reduction in frequency bandwidth ...
T. Itoh, D. P. Neikirk
openaire +1 more source
Broadband Fixed Phase Shifters
IEEE Microwave and Wireless Components Letters, 2011A method to design planar and compact phase shifters with broadband characteristics is presented. It utilizes broadside-coupled microstrip-coplanar waveguide, and thus the proposed devices can be fabricated using the simple and cheap double-side printed circuit boards. The method is used to design 60° and 90° phase shifters.
openaire +3 more sources
1973 IEEE G-MTT International Microwave Symposium, 1973
Characteristics of two novel microwave semiconductor switching devices which do not require forward current for switching are described. These devices effectively eliminate the need for drivers in phased array antennas; hence, greatly reducing the cost of phased array RADARs.
R.W. Burns, R.L. Holden, R. Tang
openaire +1 more source
Characteristics of two novel microwave semiconductor switching devices which do not require forward current for switching are described. These devices effectively eliminate the need for drivers in phased array antennas; hence, greatly reducing the cost of phased array RADARs.
R.W. Burns, R.L. Holden, R. Tang
openaire +1 more source
A Frequency-Controlled Ultrawide Bandwidth Phase Shifter: Phase Shifting Without a Phase Shifter?
29th European Microwave Conference, 1999, 1999We present in this paper results about a high-frequency analog phase shifter suitable for multi-octave operation. Principles of this ultrawide bandwidth phase shifter are based upon the use of a frequency-tunable local oscillator (LO) feeding a delay element. Through proper frequency variation, two coherent phase-shifted LO signals are produced.
N. Fel +3 more
openaire +1 more source
Instruments and Experimental Techniques, 2007
A digital phase shifter with linear phase-shift variations with a π/N step, where N is the overall division factor of used frequency dividers, is described. The device is easy to realize and intended to easily set and change a phase-shift step, carrying out the reverse (manual and automatic) phase change with a preset rate.
openaire +1 more source
A digital phase shifter with linear phase-shift variations with a π/N step, where N is the overall division factor of used frequency dividers, is described. The device is easy to realize and intended to easily set and change a phase-shift step, carrying out the reverse (manual and automatic) phase change with a preset rate.
openaire +1 more source
A Novel Implementation of Digital Phase Shifters
Bell System Technical Journal, 1975A novel technique is presented for implementing a variable digital phase shifter which is capable of realizing noninteger delays. The theory behind the technique is based on the idea of first interpolating the signal to a high sampling rate, then using an integer delay, and finally decimating the signal back to the original sampling rate.
Ronald E. Crochiere +2 more
openaire +1 more source
Light controlled phase shifter for optofluidics
Optics Letters, 2016We report the light-induced control of optical phase shift by a liquid crystal cell made with LiNbO3:Fe crystals as substrates. We show that a phase shift of a few πs can be easily reached for two orthogonal polarizations due to liquid crystal reorientation driven by the photovoltaic electric field originated in the substrates. This effect is exploited
Lucchetti, L +3 more
openaire +2 more sources