Abstract
<title>Abstract</title> <p> The researcher focuses on low temperature cofirable ceramic because LTCC technology, with its advantages in compact design, low transmitting loss, excellent integrated capability, and compliance with low-melting-point electrode materials, plays an important role in advanced microwave communication systems. However, the low temperature cofirable ceramic (LTCC) simultaneously possessing low permittivity, low sintering temperature, high quality factor and near zero τ <sub>f</sub> value is still a tremendous challenge for microwave applications. In this study Ba <sub>1−x</sub> Ca <sub>x</sub> Mg₁.₉₈Zn₀.₀₂V₂O₈–yLi₂CO₃ (x = 0.05, 0.10, 0.15, 0.20, y = 0.005, 0.0075, 0.010, 0.0125) ceramics were prepared via the use of solid state reaction method. The incorporation of Ca and Li <sub>2</sub> CO <sub>3</sub> simultaneously successfully overcome the LTCC challenge of obtaining low sintering temperature without significant reduction in microwave dielectric properties. Out of all the investigated samples in this study, the composition with x = 0.20 and y = 0.0125 exhibit encouraging (ε <sub>r</sub> ~ 8.5), (Q <sub>u</sub> f <sub>o</sub> ~38500 GHz), and temperature coefficient of resonance frequency (τ <sub>f</sub> ∼ −2.6 ppm/◦C) after sintering at 900°C for 4 h. The results of this study suggest that this ceramics are feasible alternatives for antenna applications and LTCC-based dielectric substrates utilized in modern microwave communication systems. </p>