Nonlinear Dielectric Thin Films For Active and Electrically Tunable Microwave Devices

1995 ◽  
Vol 401 ◽  
Author(s):  
A. T. Findikoglu ◽  
Q. X. Jia ◽  
D. W. Reagor ◽  
X. D. Wu
Keyword(s):  
Coplanar Waveguide ◽  
Phase Shifters ◽  
Microwave Devices ◽  
Device Structure ◽  
Dielectric Thin Films ◽  
Electrode Layer ◽  
Dc Voltage ◽  
Nonlinear Dielectric ◽  
Tunable Resonators ◽  
Waveguide Device

AbstractWe have prepared electrically tunable and active microwave devices incorporating (superconducting YBa2Cu3O7-x)/(nonlinear dielectric SrTiO3) or (normal metal Au)/(nonlinear dielectric Sr0.5Ba0.5TiO3) bilayers. The dielectric layer thickness for these samples varied between 0.5 μm and 2 μm. The top electrode layer for each sample was patterned into a coplanar waveguide device structure. We have configured these devices as voltage-tunable resonators, voltage-tunable phase shifters, voltage-tunable mixers, and voltage-tunable filters. Under dc voltage bias, these prototype devices have exhibited up to 30% resonant frequency modulation, about 1°/mm-GHz phase shift, more than 40 dB change in mixed microwave power, and finetunable symmetric filter profile with less than 2% bandwidth and more than 15% adaptive range.

scholarly journals Coplanar Waveguide-Fed Broadband Microwave Devices with (or without) a Thin Dielectric Substrate for Use in Flexible Electronic Systems

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Rafal Lech ◽  
Wojciech Marynowski ◽  
Adam Kusiek ◽  
Jerzy Mazur
Keyword(s):  
Dielectric Material ◽  
Coplanar Waveguide ◽  
Cutoff Frequency ◽  
Dielectric Substrate ◽  
Microwave Devices ◽  
Device Structure ◽  
Total Size ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

Two examples of microwave devices, fed by a coplanar waveguide and realized on a thin substrate (or without such a substrate), are employed to investigate the influence of devices’ curvatures and the proximity of different materials on their parameters. To perform the tests, a broadband antenna and a low-pass filter are chosen. A feeding coplanar waveguide is realized on a dielectric material brick attached to an SMA connector and the main device structure is placed in the air or on a thin substrate. The utilization of a thin substrate or its removal from the structure gives rise to the possibility of placing the devices on curved surfaces. The investigated devices are redesigned and manufactured. The antenna has a total size of 46 mm × 44 mm and covers a frequency range of 2.4–35 GHz which gives a 174% fractional bandwidth. The filter has a total size of 50 mm × 80 mm and its bandwidth has a cutoff frequency of 3.4 GHz. The obtained results are verified by measurements and good agreement is achieved.

Tunable microwave mixing in nonlinear dielectric thin films of SrTiO3 and Sr0.5Ba0.5TiO3

1995 ◽  
Vol 31 (21) ◽  
pp. 1814-1815 ◽  
Author(s):  
A.T. Findikoglu ◽  
D.W. Reagor ◽  
Q.X. Jia ◽  
X.D. Wu
Keyword(s):  
Thin Films ◽  
Dielectric Thin Films ◽  
Nonlinear Dielectric ◽  
Tunable Microwave

VOLTAGE CONTROL OF MAGNETISM IN MULTIFERROIC HETEROSTRUCTURES AND DEVICES

SPIN ◽  
2012 ◽  
Vol 02 (03) ◽  
pp. 1240004 ◽  
Author(s):  
NIAN X. SUN ◽  
GOPALAN SRINIVASAN
Keyword(s):  
Magnetic Field ◽  
Communication Systems ◽  
Recent Progress ◽  
Phase Shifters ◽  
Ultra Wideband ◽  
Superior Performance ◽  
Microwave Devices ◽  
Multiferroic Materials ◽  
Multiferroic Heterostructures ◽  
Rf Microwave

Multiferroic materials and devices have attracted intensified recent interests due to the demonstrated strong magnetoelectric (ME) coupling in new multiferroic materials and devices with unique functionalities and superior performance characteristics. Strong ME coupling has been demonstrated in a variety of multiferroic heterostructures, including bulk magnetic on ferro/piezoelectric multiferroic heterostructures, magnetic film on ferro/piezoelectric slab multiferroic heterostructures, thin film multiferroic heterostructures, etc. Different multiferroic devices have been demonstrated, which include magnetic sensors, energy harvesters, and voltage tunable multiferroic RF/microwave devices which are compact, lightweight, and power efficient. In this progress report, we cover the most recent progress on multiferroic heterostructures and devices with a focus on voltage tunable multiferroic heterostructures and devices with strong converse ME coupling. Recent progress on magnetic-field tunable RF/microwave devices are also covered, including novel non-reciprocal tunable bandpass filters with ultra wideband isolation, compact, low loss and high power handling phase shifters, etc. These novel tunable multiferroic heterostructures and devices and tunable magnetic devices provide great opportunities for next generation reconfigurable RF/microwave communication systems and radars, Spintronics, magnetic field sensing, etc.

scholarly journals GYROTROPIC WAVEGUIDES ANALYSIS

2010 ◽  
Vol 2 (1) ◽  
pp. 117-121
Author(s):  
Darius Plonis
Keyword(s):  
Wide Frequency Range ◽  
Phase Shifters ◽  
Microwave Devices ◽  
Dispersion Characteristics ◽  
Frequency Range ◽  
Main Mode ◽  
Semiconductor Waveguides ◽  
Higher Modes ◽  
Working Frequency ◽  
Draw Conclusion

An algorithm and program in MATLAB® for the dispersions characteristics calculation in wide frequency range 15–100 GHz was created. We calculated and analyzed in ferrite and semiconductor waveguides, then they are longitudinally magnetized, also we analyzed main mode HE11 and higher modes EH11 and HE12 dispersion characteristics. We analyzed semiconductor p-Ge, p-GaAs waveguides and compared gyromagnetic and gyroelectric waveguides bandwidth with dielectrical layer. We decided that outer dielectrical layer changed waveguide working frequency range. We draw conclusion that it can be used for made microwave devices for example phase shifters or other devices.

Ferrite Properties and Technology Issues for Improved Microwave Systems

2004 ◽  
Vol 833 ◽  
Author(s):  
Gerald F. Dionne ◽  
Daniel E. Oates
Keyword(s):  
High Speed ◽  
Uniaxial Anisotropy ◽  
Phase Shifters ◽  
Microwave Device ◽  
Low Loss ◽  
High Q ◽  
Magnetic Components ◽  
Ferrite Material ◽  
Tunable Resonators ◽  
Propagation Properties

ABSTRACTMicrowave device engineers continually seek materials advances to improve performance of magnetic components at reduced size and cost. Wherever possible, microstrip or stripline device configurations are adopted in preference to bulky waveguide structures. In radar and communications applications, the nonreciprocal propagation properties of ferrites are essential for realizing phase shifters, circulators, isolators, and power limiters. The introduction of superconductor circuits has led to the development of very low-loss phase shifters and circulators. Recent demonstrations of tuning reciprocal rf permeability by varying the state of magnetization at very low magnetic fields has led to the development of high-speed, high-Q tunable filters. In this paper, design issues of four classes of microwave device are reviewed from the standpoint of their ferrite material requirements: (1) low-loss microstrip phase shifters (2) microstrip tunable resonators, (3) self-biased microstrip circulators with normal or in-plane uniaxial anisotropy, and (4) high-power quasi-optical circulators.

scholarly journals Modeling of magnetoelectric microwave devices

2017 ◽  
Vol 30 (3) ◽  
pp. 285-293 ◽  
Author(s):  
Alexander Tatarenko ◽  
Darya Snisarenko ◽  
Mirza Bichurin
Keyword(s):  
Computer Modeling ◽  
Microstrip Line ◽  
Coplanar Waveguide ◽  
Microwave Devices ◽  
Slot Line ◽  
Piezoelectric Structure ◽  
Insertion Losses

The possibility of computer modeling implementation of electrically controlled magnetoelectric (ME) microwave devices is considered. The computer modeling results of different structures of ME microwave devices based on layered ferrite-piezoelectric structure formed on the slot line, microstrip line and coplanar waveguide are offered. Results are reported as frequency dependencies of insertion losses of ME devices.

scholarly journals Design of a Broadband Coplanar Waveguide-Fed Antenna Incorporating Organic Solar Cells with 100% Insolation for Ku Band Satellite Communication

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 142 ◽  
Author(s):  
Yadgar I. Abdulkarim ◽  
Lianwen Deng ◽  
Halgurd N. Awl ◽  
Fahmi F. Muhammadsharif ◽  
Olcay Altintas ◽  
...  
Keyword(s):  
Organic Solar Cells ◽  
Satellite Communication ◽  
Printed Circuit Board ◽  
Coplanar Waveguide ◽  
Circuit Board ◽  
Device Structure ◽  
International Telecommunication Union ◽  
International Telecommunication ◽  
Good Agreement ◽  
Ku Band

A broadband coplanar waveguide (CPW)-fed monopole antenna based on conventional CPW-fed integration with an organic solar cell (OSC) of 100% insolation is suggested for Ku band satellite communication. The proposed configuration was designed to allow for 100% insolation of the OSC, thereby improving the performance of the antenna. The device structure was fabricated using a Leiterplatten-Kopierfrasen (LPKF) prototyping Printed circuit board (PCB) machine, while a vector network analyzer was utilized to measure the return loss. The simulated results demonstrated that the proposed antenna was able to cover an interesting operating frequency band from 11.7 to 12.22 GHz, which is in compliance with the International Telecommunication Union (ITU). Consequently, a 3 GHz broadband in the Ku band was achieved, along with an enhancement in the realized gain of about 6.30 dB. The simulation and experimental results showed good agreement, whereby the proposed structure could be specifically useful for fixed-satellite-services (FSS) operating over the frequency range from the 11.7 to 12.22 GHz (downlink) band.

Design and Characterization of Novel Millimeter-Wave MEMS CPW Transmission Lines

2011 ◽  
Vol 204-210 ◽  
pp. 577-582
Author(s):  
Jian Ming Huang ◽  
Y. L. Zhou ◽  
H. Guo
Keyword(s):  
Transmission Lines ◽  
Microelectromechanical Systems ◽  
Coplanar Waveguide ◽  
Characteristic Impedance ◽  
Effective Permittivity ◽  
Phase Shifters ◽  
Mapping Technique ◽  
60 Ghz ◽  
Loss Reduction ◽  
Propagation Properties

The design and development of novel microelectromechanical systems’ (MEMS) coplanar waveguide (CPW) transmission lines, using microshield and groove, are presented in the paper to operate between 5–60 GHz. The quasi-static capacitances of CPW are calculated using the conformal mapping technique to express the propagation properties, i.e., the characteristic impedance and effective permittivity. Simulation results have shown a considerable loss reduction to levels that compare favorably with the conventional CPW. These transmission lines can be widely used in the development of phase shifters, filters, and antennas, because of their advantages in loss reduction and improvement in the performance.

Towards 76-81 GHz Scalable Phase Shifting by Folded Dual-strip Shielded Coplanar Waveguide with Liquid Crystals

2021 ◽  
Vol 5 (4) ◽  
pp. 14-22
Author(s):  
Jinfeng Li
Keyword(s):  
Liquid Crystals ◽  
Phased Array ◽  
Coplanar Waveguide ◽  
Phase Shifters ◽  
Phase Shifting ◽  
The Novel ◽  
Loss Reduction ◽  
Proof Of Concept ◽  
Tunable Dielectrics

Unconventional folded shielded coplanar waveguide (FS-CPW) has yet to be fully investigated for tunable dielectrics-based applications. This work formulates designs of FS-CPW based on liquid crystals (LC) for electrically controlled 0-360˚ phase shifters, featuring a minimally redundant approach for reducing the LC volume and hence the costs for mass production. The design exhibits a few conceptual features that make it stand apart from others, noteworthy, the dual-strip structure with a simplified enclosure engraved that enables LC volume sharing between adjacent core lines. Insertion loss reduction by 0.77 dB and LC volume reduction by 1.62% per device are reported at 77 GHz, as compared with those of the conventional single-strip configuration. Based on the proof-of-concept results obtained for the novel dual-strip FS-CPW proposed, this work provides a springboard for follow-up investible propositions that will underpin the development of a phased array demonstrator.

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