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Achieving ultrahigh Q Mg3(PO4)2 solid solution through structural optimization for broadband antenna applications
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DOI：10.1111/jace.70246.png)
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Abstract
En 中文
The rapid advancement of high-frequency wireless communication systems has significantly increased the demand for microwave dielectric ceramics with low εr and ultra-high Q·f. To address the demand, a novel solid solution ceramic was developed by substituting Zn2+ for Mg2+ in β-Mg3(PO4)2. The incorporation of Zn2+ effectively mitigated intergranular cracking and significantly enhanced ceramic densification. Therefore, the (Mg1−xZnx)3(PO4)2 ceramics exhibit optimal microwave dielectric properties at x = 0.3, with εr ≈ 5, Q·f = 138 084 GHz, and τf = −33.74 ppm/°C, achieving a substantial enhancement in Q·f compared with the matrix. To explore the intrinsic mechanism enhancing the Q·f, the structural evolution was conducted. Refinement analysis indicated that Zn2+ incorporation led to an expansion in unit cell volume. Based on this, a structure–properties relationship was established using the P–V–L theory, which revealed that the observed improvement in Q·f originates primarily from enhanced bond covalency and lattice energy. Furthermore, terahertz time-domain spectroscopy confirmed the excellent sub-millimeter wave performances (εr = 5.15, Q·f = 161 205 GHz). Leveraging these outstanding properties, a broadband cylindrical DRA was designed and fabricated, achieving a 30.2% bandwidth and a peak gain of 7.22 dBi, demonstrating significant potential for radar and satellite communication applications.
Keywords:
(Mg1−xZnx)3(PO4)2 ceramics
dielectric resonator antennas
microwave dielectric properties
P–V–L theory
THz-TDS
Journal
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3.8
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1.7W
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5.4W