研究目的
To test the ability of LTCC materials at frequencies from 100 GHz up to 300 GHz, focusing on the use of LTCC system in package devices and characterizing LTCC material as mm-wave circuit substrates at the frequency band of 220-320 GHz.
研究成果
The study successfully demonstrated a novel manufacturing process for digital printed transmission lines on LTCC substrates using Aerosol Jet printing. The printed coplanar waveguides showed promising electrical properties, with attenuation per unit length less than 0.8 dB/mm at 280 GHz for Ferro A6M. The effective dielectric constant and loss tangent were characterized, providing valuable data for future applications in high-frequency electronics.
研究不足
The study highlights the challenges of fabrication tolerances and the need for precise printing techniques to minimize differences between simulation and measurement. The reliability of LCP substrates under temperature stress and the inability to hermetically encapsulate MMICs on LCP are noted as limitations.
1：Experimental Design and Method Selection:
The study utilized LTCC materials (DuPont 9k7 and Ferro A6M-E) for manufacturing grounded coplanar waveguides (GCPW) on 35-60 μm thick substrates using high-resolution Aerosol Jet printing technique. The electrical properties of these materials were measured from 1-320 GHz for Ferro A6M-E and 1-220 GHz for DuPont 9k
2：Sample Selection and Data Sources:
Samples were prepared using LTCC materials with specific thicknesses and properties. Data were obtained using Vector Network Analyzer across specified frequency bands.
3：List of Experimental Equipment and Materials:
Equipment included Anritsu MS4647B VNA, Keysight N5245A PNA-X, and Keysight N5224A PNA for measurements. Materials included DuPont 9k7 and Ferro A6M-E LTCC substrates, silver paste, and nanoparticle silver ink.
4：Experimental Procedures and Operational Workflow:
The process involved UV laser drilling, screen printing, isostatic lamination, sintering, and Aerosol Jet printing to create GCPWs on LTCC substrates.
5：Data Analysis Methods:
S-parameters were measured and analyzed to determine the attenuation per unit length, effective dielectric constant, and loss tangent of the materials.
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