研究目的
Investigating the design and characterisation of a new liquid crystal (LC) based single-pole double-throw (SPDT) with continuously adjustable power splitting ratio in low temperature co-fired ceramic (LTCC) technology for Ka-band applications.
研究成果
The LC-based SPDT in LTCC technology demonstrates good matching and isolation with continuously adjustable power splitting ratio and centre frequency tuning capability. Despite the high insertion loss, the design shows high potential for embedded feeding networks in satellite applications, especially when connected to low noise or power amplifiers to overcome the losses.
研究不足
The high insertion loss of the SPDT, arising from surface roughness and decreased conductivity of the gold metallisation, limits its performance. The design is system-inherently narrow banded, although it works in a wider frequency range than for a single biasing configuration.
1：Experimental Design and Method Selection:
The SPDT was designed in microstrip line topology, including LC-tuned phase shifters as key components. The design rationale was to achieve continuously adjustable power splitting ratio and tuning of the centre frequency.
2：Sample Selection and Data Sources:
The demonstrator was connected to the VNA (PNA-X from Keysight Technologies) by means of ACP GSGSG 500 probes from Cascade Microtech for characterisation.
3：List of Experimental Equipment and Materials:
The equipment used includes a VNA (PNA-X from Keysight Technologies), ACP GSGSG 500 probes from Cascade Microtech, and a Keyence VHX 5000 digital microscope for surface roughness measurement. The materials include LTCC technology and a commercial microwave LC mixture (GT3-23001 from Merck KGaA).
4：Experimental Procedures and Operational Workflow:
The SPDT was characterised by measuring its matching, insertion loss, and isolation over a bandwidth. The surface roughness was measured to investigate the increased insertion loss.
5：Data Analysis Methods:
The measured results were compared with simulation results obtained from CST Studio Suite to analyse the performance of the SPDT.
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