Fabrication of high-efficiency dielectric patch antennas from temperature-stable Sr3−xCaxV2O8 microwave dielectric ceramic

Sintering behavior, crystal structure, and microwave dielectric properties of a novel NaY9Si6O26 ceramic

“…Over the entire sintering temperature range spanning 1415–1515°C, the FWHM undergoes a characteristic trajectory of diminishing, followed by amplification. Remarkably, this trend contrasts with the behavior observed for the Q × f value of the sample 43,44 . Typically, the FWHM of a prominent band in the Raman spectrum exhibits an inverse relationship with the Q × f value.…”

“…Remarkably, this trend contrasts with the behavior observed for the Q × f value of the sample. 43,44 Typically, the FWHM of a prominent band in the Raman spectrum exhibits an inverse relationship with the Q × f value. At the zenith of the Q × f value, TA B L E 3 Microwave properties of various microwave dielectric ceramics including Na and Si systems with similar relative permittivity.…”

Effects of oxygen vacancy on bond ionicity and microwave dielectric properties of YxCe1−xO2−0.5x (x = 0–0.7) ceramics

“…The microwave dielectric properties of the sintered ceramics were assessed via by the Hakki-Coleman method, by using a microwave network analyzer (N5234A, Agilent Co.). 12,13 The temperature coefficients of resonant frequency were calculated at approximately 25-85 • C in TE 01𝛿 mode using the following formula (Equation 1) 14,15 :…”

“…The microwave dielectric properties of the sintered ceramics were assessed via by the Hakki–Coleman method, by using a microwave network analyzer (N5234A, Agilent Co.) 12,13 . The temperature coefficients of resonant frequency were calculated at approximately 25–85°C in $${\mathrm{T}}{{\mathrm{E}}_{01{{\delta}}}}$$ mode using the following formula (Equation ) 14,15 : $$$$\begin{equation}{\mathrm{\;}}{\tau _f} = \frac{1}{{f\left( {{T_0}} \right)}}\;\frac{{\left[ {f\left( {{T_1}} \right) - f\left( {{T_0}} \right)} \right]}}{{{T_1} - {T_0}}},\end{equation}$$$$where $$f( {{T_1}} )$$ and $$f( {{T_0}} )$$ represented the resonant frequency at $${T_1}$$(85°C) and $${T_0}$$(25°C), respectively.…”

Effects of oxygen vacancy on bond ionicity, lattice energy, and microwave dielectric properties of CeO 2 ceramics with Yb 3+ substitution

“…The content of oxygen vacancies and different valence ions in ceramics was characterized by X-ray photoelectron spectroscopy (XPS). Also, the microwave dielectric properties of the sintered ceramics were conducted by Hakki-Coleman method using a microwave network analyzer (N5234A, Agilent Co., USA) [11,12]. The temperature coefficients of resonant frequency were calculated at 25-85 ℃ in mode by Eq.…”