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Bending Limit Tests for Ultra-Thin Liquid Crystal Polymer Substrate Based on Flexible Microwave Components.
Yu Lan1, Yuehang Xu2
1School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu 611731, China. Lanyu136482942@163.com.
Micromachines
|November 15, 2018
Summary
This study tested the bending limits of ultra-thin liquid crystal polymer (LCP) microwave components. Copper laminate fracture limits flexibility, with failure occurring at bending radii as small as 0.75 mm.
Area of Science:
- Electrical Engineering
- Materials Science
- Microwave Engineering
Background:
- Flexible microwave components require robust substrates capable of withstanding mechanical stress.
- Ultra-thin liquid crystal polymer (LCP) substrates offer potential for compact and conformable microwave devices.
Purpose of the Study:
- To investigate the bending limit characteristics of ultra-thin LCP substrates for microwave applications.
- To identify failure mechanisms in flexible microwave microstrip components under bending stress.
Main Methods:
- Design and fabrication of X-band microstrip lines, band-pass filters, and stepped impedance filters on 50 μm LCP substrates with 18 μm copper.
- Performance of bending limit tests to determine the minimum allowable bending radius.
- Microscopic analysis to identify the cause of component failure.
Main Results:
- Flexible LCP microwave components were successfully fabricated using conventional photolithography.
- Bending limit tests revealed component failure at radii between 1 mm and 0.75 mm.
- Failure was attributed to the fracture of the 18 μm copper laminate.
Conclusions:
- The mechanical integrity of the copper layer is critical for the flexibility of LCP-based microwave components.
- Understanding these bending limits is essential for designing reliable and high-performance flexible microwave systems.
- Further research can optimize substrate and conductor design for enhanced flexibility and durability.
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