[Show abstract][Hide abstract] ABSTRACT: Microwave microstrip resonators and filters controlled by ferroelectric
capacitors have been simulated and experimentally studied. Control at
room temperature and under cryogenic conditions has been ensured by
capacitors based on BSTO and STO films, respectively. Cooled devices
based on YBa2Cu3O7-δ
high-temperature superconducting films have been fabricated. The
developed filters are efficiently tuned by applying a control voltage,
are small, and have a low level of introduced losses.
[Show abstract][Hide abstract] ABSTRACT: Problem of a design of high quality tunable microstrip resonators and filters is of high importance. The analytical description, design, simulations, and measurements of microstrip resonators and tunable filters with ferroelectric tunable capacitors are presented. The key parameters and quality characteristics are introduced and estimated.
[Show abstract][Hide abstract] ABSTRACT: The experimental characteristics and results of a simulation of four-pole filters based on high-temperature superconductor films fabricated by the Theva firm (Munich) and the Institute for Physics of Microstructures, Russian Academy of Sciences (Nizhnii Novgorod) are presented. The model parameters and surface resistance of the investigated films are determined from the characteristics obtained. For direct measurements of the films’ surface resistance, a disc resonator with a frequency of 10 GHz has been developed at the Institute for Physics of Microstructures.
No preview · Article · May 2012 · Journal of Surface Investigation X-ray Synchrotron and Neutron Techniques
[Show abstract][Hide abstract] ABSTRACT: The characteristics of fourth-order bandpass microwave filters based on high-temperature super-conductor (HTS) films have
been numerically simulated and experimentally measured for the devices based on YBCO films purchased from Theva GmbH (Munich)
and manufactured at the Institute for Physics of Microstructures (Nizhni Novgorod). Experimental data were used to determine
the parameters of the surface impedance model for the HTS films. The results show that HTS-based filters with high performance
characteristics can be obtained using HTS films manufactured by different technologies.
No preview · Article · May 2011 · Technical Physics Letters
[Show abstract][Hide abstract] ABSTRACT: Complex approach to the design of microstrip resonators and filters based on High Temperature Superconductor (HTS) films is described, which includes modeling of the electrodynamics parameters of HTS films, design of microstrip resonators and filters, their manufacturing, and testing. Test samples of resonators were prepared using YBCO films on LaAlO3 and r-cut sapphire substrates. The resonator and filter structures were patterned using ion beam lithography. Experimental data were used for extracting parameters of the model of the YBCO film surface impedance. Using the correct model parameters, the following filters have been designed and tested: 4th order band-pass filter, 14-pole band-pass filter, two band-reject filters for applications in microwave frequency range, and 5-pole mm-wave filter for radio-astronomy receiving module.
[Show abstract][Hide abstract] ABSTRACT: Complex approach to the investigation of microstrip resonators and filters based on High-Temperature Superconductor (HTS)
films is described, which includes modeling of the electrodynamic parameters of HTS films, designing of microstrip resonators
and filters, their manufacturing, and testing. Test samples were prepared using YBCO films on 0.5-mm-thick lanthanum aluminate
substrates. The resonators and filter structures were patterned using ion-beam photolithography. Experimental data were used
to determine the parameters of the model of surface impedance of the YBCO film and the film thickness and permittivity. Adequacy
of the model and reliability of the model parameters, which were used for the synthesis and design of a 4th-order filter,
were confirmed by coincidence of the experimental and calculated characteristics.
[Show abstract][Hide abstract] ABSTRACT: Additional degrees of freedom in a design of miniature microwave devices can be provided by a combination of right-handed (RH) and left-handed (LH) transmission lines (TL), which differ in dispersion characteristics. We present some examples of such devices: planar resonator and filter with suppressed spurious response as well as a miniaturized matched balun and broadband digital phase shifters. Whereas these structures follow the right/left-handed TL approach, it is also possible to implement left-handed structures by following the resonant type approach, i.e. by using split rings resonators or complementary split rings resonators. Examples to illustrate the possibilities of this approach are also presented
[Show abstract][Hide abstract] ABSTRACT: Design of broadband digital phase shifters based on switchable right/left-handed transmission lines is considered. Different practical implementations of the phase shifters designed as microstrip and coplanar multilayer structures containing an artificial quasi-lumped-element left-handed transmission line and an artificial or natural right-handed transmission line are presented.
[Show abstract][Hide abstract] ABSTRACT: Compact miniature microwave phase shifters have been designed on a combination of conventional (righthanded) transmission line sections and dual ones (left-handed) with negative dispersion. The phase shifters of two kinds are under consideration in this paper: an analog tuneable phase shifter using ferroelectric varactors as the tuneable components and digital phase shifters based on switched right-handed/left-handed transmission lines using p-i-n-diodes for switching the channels. All the devices have been implemented as multilayer integrated circuits. Operating the phase shifters in a wide frequency band is demonstrated. Solutions providing operation of tuneable ferroelectric phase shifter in a wide temperature range have been proposed.
No preview · Article · Jan 2005 · Proceedings of SPIE - The International Society for Optical Engineering