Preparation of ZnAl2O4-based microwave dielectric ceramics and GPS antenna by aqueous gelcasting

Wu, Jiamin; Lu, Wen‐Zhong; Lei, Wen; Wang, Xiaochuan

doi:10.1016/j.materresbull.2011.04.026

Cited by 39 publications

(22 citation statements)

References 17 publications

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“…The developed composite have better thermal conductivity as compared to other LTCC materials. The improved thermal conductivity of the composite may be due to the presence of ZnAl 2 O 4 which has a high thermal conductivity and is in agreement with earlier reports [30][31][32]. Fig.…”

Section: Resultssupporting

confidence: 91%

LTCC tapes based on Al2O3–BBSZ glass with improved thermal conductivity

Induja

Abhilash

Arun

et al. 2015

Ceramics International

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Section: Resultssupporting

confidence: 91%

LTCC tapes based on Al2O3–BBSZ glass with improved thermal conductivity

Induja

Abhilash

Arun

et al. 2015

Ceramics International

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“…Many researchers have tried to study the dielectric properties of ZnAl 2 O 4 ceramics such as Wang et al [3], Surendran et al [4], Wu et al [5], and Lei et al [6][7][8][9]. They have found that the ZnAl 2 O 4 -based microwave dielectric ceramics have a very extensive prospect research for millimetre-wave applications and GPS antenna in the future with various dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

“…The values of the ZnAl 2 O 4 were found in the range of 8.3 [6] to 9.01 [10], while their unloaded quality factor ( ) for ZnAl 2 O 4 was around 4,590. These ceramics were prepared by conventional solid state [3] and aqueous gel casting [5] methods, which involved the high sintering temperature (above 1400 ∘ C). The sintering temperature above 1400 ∘ C cannot satisfy the requirements for the preparation of modern functional ceramics.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zn Site for Ca Substitution on Optical and Microwave Dielectric Properties of ZnAl₂O₄Thin Films by Sol Gel Method

Jalal

Abdullah

Zulfakar

2014

Advances in Materials Science and Engineering

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CaxZn(1-x)Al2O4(x= 0.00, 0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) thin films were prepared by a sol gel method. The XRD patterns displayed the characteristic peaks of (Ca/Zn)Al2O4with the standard pattern of face-centred cubic (fcc). The addition of Ca decreased the lattice constant from 14.6 nm to 23.2 nm. The optical bandgap of undoped thin film was found to be at 3.84 eV while for doped Ca was observed at 3.50 to 3.73 eV. The substitution of Zn2+by Ca2+in ZnAl2O4thin films was found to increase the crystallite size, grain size, and surface morphology which evidently affect the density and dielectric constant. TheCaxZn1-xAl2O4thin films were characterized at 20 to 1 MHZ frequency to determine the dielectric constantεrand unloaded quality factorQuusing LCR spectrometer. It can be observed that specimen using Ca0.25Zn0.75Al2O4possessesεr~10.41andQu~5770which is suggested as a candidate material for millimetre-wave applications. Therefore, this ceramic is suggested as a candidate material for GPS patch antennas.

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“…This could lead to more effective interface effects that could lead to a higher dielectric constant at a specific composite concentration . Such giant dielectric composites may be suitable candidates for emerging size reduction of GPS antennas by 263 times instead of ZnAl 2 O 4 ceramic which has dielectric constant of 12.45 and 404 times that of Zn (1– X ) Mg X Al 2 O 4 , (1‐X)ZnAl 2 O 4 ‐XSiO 2 , Zn (1– X ) Ca X Al 2 O 4 , Ti X Zn (1– X ) Al 2 O 4 and Ca X Zn (1– X ) Al 2 O 4 . Based on these observations, BTO‐CCTO composite based GPS patch antennas are fabricated for the first time with cost‐effective technique.…”

Section: Resultsmentioning

confidence: 99%

Development of performance‐improved global positioning system (GPS) patch antenna based on sol‐gel‐synthesized dual‐phase (Bi₄Ti₃O₁₂)_X – (CaCu₃Ti₄O₁₂)_1–_X composites

Thiruramanathan¹,

Marikani²,

Durairaj³

et al. 2016

Crystal Research and Technology

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.0) is synthesized by a sol-gel combustion method. The phase changes, including their formation and evolution during the gradual substitution of BTO into CCTO are analyzed from the X-ray diffraction pattern. The Jana2006 refinement plotting method proves that formation of an ideal dualphase composite system with separate orthorhombic and cubic phases occurs. A surface morphological study revealed that the BTO X -CCTO 1-X composites are composed of small CCTO grains embedded in large BTO grains and both coexisted with a bimodal distribution. The possible vibrational modes of interactions between the constituent phases are determined from Raman spectra. Our inexpensive, combustion method for BTO 0.2 -CCTO 0.8 gives a high dielectric constant (ε = 3232) at 100 Hz at room temperature. The nature behind these data is revealed that the BTO-CCTO composite can be applicable for the fabrication of miniaturized global positioning system (GPS) patch antennas. The fabricated GPS patch antenna shows optimum results of small size (2.37 mm × 1.18 mm), return loss (-14.419) and wide bandwidth (350 MHz) to be operated at 1.57 GHz.

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Preparation of ZnAl2O4-based microwave dielectric ceramics and GPS antenna by aqueous gelcasting

Cited by 39 publications

References 17 publications

LTCC tapes based on Al2O3–BBSZ glass with improved thermal conductivity

LTCC tapes based on Al2O3–BBSZ glass with improved thermal conductivity

Effect of Zn Site for Ca Substitution on Optical and Microwave Dielectric Properties of ZnAl₂O₄Thin Films by Sol Gel Method

Development of performance‐improved global positioning system (GPS) patch antenna based on sol‐gel‐synthesized dual‐phase (Bi₄Ti₃O₁₂)_X – (CaCu₃Ti₄O₁₂)_1–_X composites

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Preparation of ZnAl2O4-based microwave dielectric ceramics and GPS antenna by aqueous gelcasting

Cited by 39 publications

References 17 publications

LTCC tapes based on Al2O3–BBSZ glass with improved thermal conductivity

LTCC tapes based on Al2O3–BBSZ glass with improved thermal conductivity

Effect of Zn Site for Ca Substitution on Optical and Microwave Dielectric Properties of ZnAl2O4Thin Films by Sol Gel Method

Development of performance‐improved global positioning system (GPS) patch antenna based on sol‐gel‐synthesized dual‐phase (Bi4Ti3O12)X – (CaCu3Ti4O12)1–X composites

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Effect of Zn Site for Ca Substitution on Optical and Microwave Dielectric Properties of ZnAl₂O₄Thin Films by Sol Gel Method

Development of performance‐improved global positioning system (GPS) patch antenna based on sol‐gel‐synthesized dual‐phase (Bi₄Ti₃O₁₂)_X – (CaCu₃Ti₄O₁₂)_1–_X composites