Characteristics of materials for microwave devices

Murthy, V. R. K.; Raju, K. C. James; Viswanathan, B.

doi:10.1007/bf02927499

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…These class of materials have been the subject of extensive studies by physicists and chemists alike. A whole range of distribution of cations is possible in spinels which can be represented generally by the formula where the ions inside the brackets are said to occupy octahedral sites (B) and the ions outside the bracket occupy the tetrahedral sites (A) [2]. In the above formula when "1, it is called normal spinel.…”

Section: Introductionmentioning

confidence: 99%

On the magnetic properties of ultra-fine zinc ferrites

Anantharaman

Jagatheesan

Malini

et al. 1998

Journal of Magnetism and Magnetic Materials

120

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Section: Introductionmentioning

confidence: 99%

On the magnetic properties of ultra-fine zinc ferrites

Anantharaman

Jagatheesan

Malini

et al. 1998

Journal of Magnetism and Magnetic Materials

120

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“…A stripline [16] combline band pass filter was designed to have fractional bandwidth of 27% or FBW=0.27 at the midband frequency of 11 GHz. Tschebyshev low pass prototype filter of order n = 3 with pass band ripple of 0.1 dB was chosen.…”

Section: Fiter Design Processmentioning

confidence: 99%

“…The band pass filter topology is shown in Figure 5 and analyzed using the ADS software of Agilent Technologies relying on the S-parameters. A dielectric substrate [16] with a relative dielectric constant of 4.32 and a thickness of 1.6 mm was chosen for the filter design. The dimensions w [j] and s [j] of the lines and capacitances C j between each line and ground are represented.…”

Section: Fiter Design Processmentioning

confidence: 99%

Performance Analysis of Low noise amplifier using Combline Bandpass Filter for X Band Applications

Lahsaini

Islam

Zenkouar

2019

IJEEI

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This paper describes a procedure for designing broadband low noise amplifier for X-Band applications. The design and implementation are based on HEMT transistors AFP02N2-00 of Alpha Industries®. The matching circuit used for modeling the microwave amplifier is the quarter-wave transformers impedance matching technique associated to combline bandpass filter. The proposed amplifier is implemented on a substrate of epoxy FR4 with a central frequency of 11GHz and a fractional bandwidth of 0.18% and is designed to be used in radar reception systems. The results show that the proposed LNA is unconditionally stable with a simulated gain of 20dB over the working frequency range of [9.5−12.5] GHz.

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“…(3) The temperatures corresponding to reactions (2) and (3) are significantly different depending on the author [14,15]. The values given vary from 600 to 900C for reaction (2) and from 800 to 1200C for reaction (3) when it is annealed for longer duration such as 10 hours.…”

Section: Reaction Mechanismmentioning

confidence: 99%

Synthesis and Spectroscopic Analysis of Ferrimagnetic Yttrium Iron Garnet for Tunable Filter Applications

Goldwin¹,

Aravindhan

Senthil³

et al. 2017

NHC

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Yttrium iron garnet (YIG) powdered ceramic powders were synthesized as bulk quantity by traditional solid state synthesis method by the use of yttrium oxide and iron oxide powders. Finely grinded powders were then calcinated for various temperatures such as 900, 1200 oC for 3 hours and 1400oC for 6 hours respectively after making multiple grindings to obtain homogeneity. The calcinated powders were then subjected to phase purity by the use of powder X-ray analysis. As it is clear evident from the samples that the powdered samples were of single phase in nature and that it is clear evident from the nature of the sample which transforms to green in colour from the traditional red iron based oxides. The bonding nature was further ascertained by the used of Fourier transform infrared spectrometer (FTIR) analysis. Thermal stability and phase formation was confirmed through thermal analysis. The thermo-magnetization curve reveals the curie temperature of the sample which is in good agreemement with that of the reported values. Magnetization versus magnetic field curve was obtained which showed increase in magnetization due to the pure phase formation. These preliminary results suggest that the YIG powders could be made in to ceramic pellets for the use of tunable filters in the areas of microwave oscillators.

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Characteristics of materials for microwave devices

Abstract: Abstriet. The characteristics of materials like ferrites, garnets, ferroeleetrfes, temperaturecompensated dielectrics and copper-coated PTFE-based composites, extensively used in microwave devices are discussed.

Cited by 8 publications

References 10 publications

On the magnetic properties of ultra-fine zinc ferrites

On the magnetic properties of ultra-fine zinc ferrites

Performance Analysis of Low noise amplifier using Combline Bandpass Filter for X Band Applications

Synthesis and Spectroscopic Analysis of Ferrimagnetic Yttrium Iron Garnet for Tunable Filter Applications

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