Phase-engineered MgAl3/2[Li1/3Ti2/3]1/2O4-MgO ceramics: Synergistic optimization of microwave dielectric and mechanical properties for high-gain C-band dielectric resonator antenna

Enhanced microwave dielectric properties and low-temperature sintering of W6+-doped La2Mo2O9 ceramics

Effect of Sr2+ substitution on the sintering behavior and microwave dielectric properties of CaNd2(MoO4)4 ceramics

Abstract This study pioneers the cross‐disciplinary application of garnet‐type solid‐state electrolyte Li 7 La 3 Zr 2 O 12 (LLZO) in microwave dielectric ceramics. LLZO was synthesized via solid‐state reaction, achieving optimized microwave dielectric properties at 900°C: ε r = 8.13, Q × f = 31 735 GHz, τ f = −44.3 ppm/°C. Direct cofiring experiments with Ag electrodes validated its compatibility with low‐temperature cofired ceramic (LTCC). X‐ray diffractometer (XRD)/scanning electron microscope (SEM)–energy‐dispersive X‐ray spectroscopy (EDS) confirmed interfacial stability and chemical inertness, overriding standalone thermal expansion parameter considerations. A Beidou antenna prototype on LLZO substrates demonstrated 59.2 MHz bandwidth at 1.57 GHz with 4.33 dBi gain and >97% radiation efficiency. By synergizing low‐loss microwave response with inherent Li⁺ conductivity and thermal robustness, LLZO emerges as a multifunctional platform for integrated energy‐communication systems. It enables future designs of LTCC based self‐powered modules and real‐time structural health monitoring devices. This work bridges solid‐state electrolytes and microwave ceramics, offering a paradigm for material innovation in fifth‐generation (5G)/sixth‐generation (6G) networks and intelligent electronics.

High-performance LTCC: Structural and microwave dielectric properties of NaLn(MoO4)2 (Ln = Pr, Sm)

Improved microwave dielectric properties of BaSm2O4 achieved by a modified reaction sintering method

MRI is widely used for breast cancer screening for women at a high risk including those with dense breasts. Gadolinium-based contrast agents provide excellent sensitivity for tumor detection; however, some reports suggest that significant health risks may be associated with gadolinium use. Alternative techniques to improve breast MRI specificity that do not reply on gadolinium injection are needed. Microwave dielectric properties provide excellent endogenous contrast between malignant and normal breast tissue. While standalone microwave imaging (MI) methods are available, they typically suffer from poor spatial resolution. Integrating concurrent MI with MRI would allow high resolution from MRI to be combined with high specificity from MI. We have developed a MI system that operates inside the bore of an MR scanner without disruption to image acquisition from either modality. Results are presented from the first set of experiments in anthropomorphic breast phantoms conducted with the integrated imaging configuration. MRI and microwave data were acquired simultaneously with a system which met size, materials, and operational constraints imposed by the MRI scanner bore and associated electromagnetic environment. Functionality included coaxial antenna feedlines mounted to a plate underneath an imaging tank with integrated breast imaging coils, which was moved vertically to provide multiples planar views of the imaging region of interest. The MI technique imported MR spatial information directly into a soft prior-based algorithm for 3D image reconstruction. The method did not utilize any prior information other than the MRI structural data. MI recovered spherical fibroglandular and tumor equivalent tissue inclusions within a predominant adipose tissue. Data were presented at three frequencies-900, 1100, and 1300MHz, respectively-with comparable results. Microwave property distributions were relatively homogeneous across each tissue zone with steep gradients at their associated interfaces. Permittivity images recovered properties well for all three tissue types, while conductivity images maintained fidelity for adipose and tumor tissues but became inaccurate in the fibroglandular tissue equivalent zones. To the best of our knowledge, these microwave images are the first to be reconstructed from 3D data acquired inside a MRI scanner bore where MRI data were incorporated as spatial priors within the resultant microwave images. MR-MI system logistical challenges were overcome sufficiently to recover accurate images of phantoms making the multi-modality approach ready for actual patient examinations in the future.

Milling duration strongly affects the microstructure, phase purity, and dielectric performance of NdMg0.5Ti0.5O3 (NMT) ceramics synthesized via solid-state reaction. Milling times from 2 to 12 h were examined for their influence on phase composition, sinterability, and microwave dielectric properties. Excessive milling caused the formation of a secondary MgSiO3 phase from the agate media, degrading the Q·f value. The optimal milling time of 6 hours provided the best performance with Q·f = 55,000, εr = 26.4, τf = −35 ppm/°C, sintering temperature of 1540 °C, and strong microwave absorption (40 dB at ∼10 GHz).

Microwave dielectric properties and antenna simulation of Li2MoO4-BaV2O6 ceramics with low sintering temperature

Manipulating microwave dielectric properties of Li2TiO3-based ceramics through chemical doping-controlled phase modulation engineering

ZnO-doped MnMoO4 ceramics with modulated structure and enhanced microwave dielectric properties for λ/2 microstrip bandpass filters

Microwave dielectric properties of Ca2⁺-substituted Li₂SrSiO₄ ceramics: investigation via Raman, SEM, and P–V–L theory

Room-temperature densified Al2O3-H3BO3 ceramics with excellent microwave dielectric properties and thermal conductivity for chip packaging

Structural characteristics and microwave dielectric properties of low-loss spinel type Li2M2Ga2Ti3O12 (M = Mg, Zn) ceramics for dielectric resonant antenna applications

Synergistic enhancement of microwave dielectric properties in Li0.2Zn0.9TiO3-ZnMg2TiO5 ceramics via a four-phase solid solution approach

Simultaneous optimization of microwave dielectric properties and energy storage performance in low loss CaTiO3-MgTiO3-based linear composite ceramic

Low-cost preparation and microwave dielectric properties of a novel talc-based Li2-MgSiO4 (x = 0–0.4) ceramic

Crystal structures and microwave dielectric properties of Zn1-Mg MoO4 solid solution ceramics

Influence of microwave annealing on the structural, optical, and microwave dielectric properties of NBT thin films

Abstract The microwave dielectric properties of CaMoO 4 were significantly enhanced by partial strontium substitution using a solid‐state synthesis method. Sr substitution effectively reduced the sintering temperature. The lattice mismatch‐induced local stress fields and distortions may extend to the macroscopic scale, ultimately resulting in residual strain. The temperature coefficient of the resonant frequency can be enhanced by moderate strain fields and lattice distortions. Ionic transport was suppressed, and dielectric loss was further reduced owing to the mitigation of oxygen vacancies, blockage of diffusion pathways, and the increase in the migration energy barrier induced by Sr incorporation. Ultimately, (Ca 0.5 Sr 0.5 )MoO 4 ceramics sintered at 950°C exhibited excellent dielectric performance ( ε r = 10.15, Q × f = 99 928 GHz, τ f = ‒8.55 ppm/°C).