We demonstrate a stable and linear photonic radio frequency (RF) phase shifter based on a differential-group-delay element and the polarization sensitive effect of an optical phase modulator. The phase shift can be tuned continuously over 360 degrees for RF signals over 40GHz with an electrical control voltage from -7.5 to +7.5V.

A fast ferroelectric phase shifter controlled by an electric field bias is being investigated for high-power fast RF phase shifters to be used for vector modulation. Such a device could find applications in particle accelerators, allowing vector control of the RF power divided and delivered to accelerating cavities from a power amplifier. Bulk ferroelectric materials, particularly those based o...

A very low-loss tunable millimeter-wave phase shifter driven by dielectric elastomer actuators (DEAs) is presented. The device consists of a fixed coplanar waveguide (CPW) and two metallic loading strips suspended on an elastomer membrane. The horizontal offset between the CPW and the strips is dynamically controlled by integrated DEAs. The variable interaction between the CPW and the loading s...

This paper deals with a low-power programmable (PRESTO) generator for creating pseudo-random test patterns with desired toggling levels and improved fault coverage versus the state-of-the-art built in self test (BIST) based pseudorandom test pattern generator. A PRESTO generator involves a linear finite state machine (linear feedback shift register or a ring generator) and an auxiliary circuit ...

A no ̈el technique for the design of phase shifters is de ̈eloped. The method makes use of the phase ̈ariation with frequency shown by frequency filters; this results in phase shifters that are small. These phase shifters pro ̈ide near linear differential phase shift, and can be designed for both narrowband or wideband applications. Q 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 19: 384...

Various phase shifters and absorbers can be put into the arms of a double loop neutron interferometer. The mean intensity levels of the forward and diffracted beams behind an empty four plate interferometer of this type have been calculated. It is shown that the intensities in the forward and diffracted direction can be made equal using certain absorbers. In this case the interferometer can be ...

A new method to design a miniaturized ring coupler consisting of multiple open stubs on the inside of the ring is proposed. It is shown that this coupler topology may be seen as fully-distributed composite right/left handed (CRLH) small-size phase shifters, cascaded in a ring configuration. The CRLH phase shifter is analyzed in detail and a design method is proposed, pointing out the condition ...

*Correspondence: Suguru Akiyama, Photonics Electronics Technology Research Association, Tsukuba West 7, 16-1 Onogawa, Tsukuba 305-8569, Japan e-mail: [email protected] Silicon modulators, which use the free-carrier-plasma effect, were studied, both analytically and experimentally. It was demonstrated that the loss-efficiency product, α · VπL, was a suitable figure of merit for silicon modu...