Novel monolithic phase shifter combining ferroelectrics and high temperature superconductors

Jackson, Charles M.; Kobayashi, June H.; Lee, Alfred; Pettiette-Hall, C.L.; Burch, J.F.; Hu, R.; Hilton, Rick; McDade, Jim

doi:10.1002/mop.4650051406

Cited by 19 publications

(4 citation statements)

References 15 publications

(7 reference statements)

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“…Some materials which have shown a variable permittivity with electric field are SrTiO 3 , (Ba, Sr)TiO 3 , (Pb, Sr)TiO 3 , (Pb, Ca)TiO 3 , Ba (Ti, Sn)O 3 , Ba (Ti, Zr)O 3 and KTaO 3 . Dopants are introduced into pure STO to attempt to improve the microwave properties, and there has been some success at reducing the loss tangent [8][9][10].…”

Section: Methodsmentioning

confidence: 99%

Thin-film ferroelectric microwave devices

Lancaster

Powell

Porch

1998

Supercond. Sci. Technol.

218

113

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When an electric field is applied to a ferroelectric material, the microwave permittivity undergoes a substantial change. This change in permittivity can be utilized in microwave devices to produce frequency-agile functions. This paper is a comprehensive review of the work on ferroelectric materials; this includes models of the ferroelectric permittivity and loss tangent, as well as methods of measurement of these properties. New measurements are presented on thin-film strontium titanate and single-crystal strontium barium titanate substrates. These results are compared with the model. A brief discussion is given of the applications of ferroelectric material in microwave devices.

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Section: Methodsmentioning

confidence: 99%

Thin-film ferroelectric microwave devices

Lancaster

Powell

Porch

1998

Supercond. Sci. Technol.

218

113

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“…For example, 0.96K 0.5 Na 0.5 NbO 3 -0.04BiScO 3 139 and 0.82(0.94Bi 1/2 Na 1/2 TiO 3 -0.06BaTiO 3 )-0.18K 0.5 Na 0.5 NbO 3 175 relaxor ceramics were shown to have permittivity values of over 2000 with variation of De/e less than 10% in the temperature range from 100°C to 300°C (Fig. [265][266][267] Usually the materials have to show a large dielectric tunabilty, =100%·[e(0)Àe(E)]/e(0), and low dielectric loss. A large, temperature stable dielectric constant combined with high electrical resistivity is necessary for the development of high-energy density capacitors, which are used in power electronic applications, such as filtering, voltage smoothing, dc blocking, power conditioning, electromagnetic interference suppression, commutation in power electronic circuits, etc.…”

Section: Technological Perspectivesmentioning

confidence: 99%

“…51 The dc electric-field tuned dielectric materials are candidates for microwave applications, including voltage-controlled oscillators, tunable filters, phase shifters, etc. [265][266][267] Usually the materials have to show a large dielectric tunabilty, =100%·[e(0)Àe(E)]/e(0), and low dielectric loss. Among the most studied compounds are presently ferroelectric (Ba, Sr)TiO 3 268 and (Pb,Sr)TiO 3 266 .…”

Section: Technological Perspectivesmentioning

confidence: 99%

Lead‐Free Relaxor Ferroelectrics

2011

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Feature size is a natural determinant of material properties. Its design offers the technological perspectives for material improvement. Grain size, crystallite size, domain width, and structural defects of different nature constitute the classical design elements. Common ferroelectric ceramics contain micrometer grain sizes and submicrometer domain widths. Domain wall mobility is a major contribution to their macroscopic material properties providing approximately half of the macroscopic output in optimized materials. The extension into the dynamic nanoworld is provided by relaxor ferroelectrics. Ionic and nanoscale field disorders form the base to a state with natural nanometer‐size polar structures even in bulk materials. These polar structures are highly mobile and can dynamically change over several orders of magnitude in time and space being extremely sensitive to external stimuli. This yields among the largest dielectric and piezoelectric constants known. In this feature article, we want to outline how lead‐free relaxors will offer a route to an environmentally safer option in this outstanding material class. Properties of uniaxial, planar, and volumetric relaxor compositions will be discussed. They provide a broader and more interesting scope of physical properties and features than the classical lead‐containing relaxor compositions.

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“…Several materials have shown a variable permittivity with the electric field, such as Strontium titanate (SrTiO3), Barium titanate (Ba, Sr. TiO3), (Pb, Sr)TiO3, (Pb, Ca)TiO3, Ba(Ti, Sn)O3, Ba(Ti, Zr)O3 and KTaO3 dopants [16][17][18].…”

Section: Charcterisitics Of the Ferroelectric Materialsmentioning

confidence: 99%

Tunable Zeroth-Order Resonator Based on Ferroelectric Materials

Mansour¹,

Kanaya²

2021

Multifunctional Ferroelectric Materials

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Tunable microwave devices have the benefits of added functionality, smaller form factor, lower cost, and lightweight, and are in great demand for future communications and radar applications as they can extend the operation over a wide dynamic range. Current tunable technologies include several schemes such as ferrites, semiconductors, microelectromechanical systems (MEMS), and ferroelectric thin films. While each technology has its own pros and cons, ferroelectric thin film-based technology has proved itself as the potential candidate for tunable devices due to its simple processes, low power consumption, high power handling, small size, and fast tuning. A tunable Composite Right Left-Handed Zeroth Order Resonator (CRLH ZOR) is introduced in this chapter and it relies mainly on the latest advancement in the ferroelectric materials. It is common that for achieving optimum performance for the resonant structure, this involves the incorporation of an additional tuning by either mechanical means (i.e. with tuning screws) or other coupling mechanisms. The integration between electronic tuning and High-Temperature Superconducting (HTS) components yields a high system performance without degradation of efficiency. This leads not only low-loss microwave components that could be fine-tuned for maximum efficiency but will provide a tunable device over a broadband frequency spectrum as well. The dielectric properties of the ferroelectric thin film, and the thickness of the ferroelectric film, play a fundamental role in the frequency or phase tunability and the overall insertion loss of the circuit. The key advantages of using ferroelectric are the potential for significant size-reduction of the microwave components and systems and the cabibility for integration with microelectronic circuits due to the utilization of thin and thick ferroelectric film technology. In this chapter, ZOR is discussed and the conceptual operation is introduced. The ZOR is designed and simulated by the full-wave analysis software. The response is studied using electromagnetic characteristics with the applied electric field, ferroelectric thickness, and the operating temperature.

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Novel monolithic phase shifter combining ferroelectrics and high temperature superconductors

Cited by 19 publications

References 15 publications

Thin-film ferroelectric microwave devices

Thin-film ferroelectric microwave devices

Lead‐Free Relaxor Ferroelectrics

Tunable Zeroth-Order Resonator Based on Ferroelectric Materials

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