HTS Filters Undergo Mechanical Tuning

Oct. 11, 2007
HTS filters are known for their low insertion loss and high out-of-band rejection. Yet the performance of these filters may be negatively impacted by the thickness of the HTS film, dielectric-constant variations, and more. Tuning work is therefore ...

HTS filters are known for their low insertion loss and high out-of-band rejection. Yet the performance of these filters may be negatively impacted by the thickness of the HTS film, dielectric-constant variations, and more. Tuning work is therefore required to guarantee high performance in an HTS filter. Such tuning may be mechanical, electrical, or magnetic in its approach. At Tsinghua University in Beijing, China, researchers successfully used a mechanical tuning method to correct the center frequency shifts of HTS filters. This work was carried out by Huili Peng, Xiaoping Zhang, Xubo Guo, Lijuan Mu, Bin Wei, Baoxin Gao, and Bisong Cao. Their mechanicaltuning method uses sapphire and copper rods for high-temperature superconducting filters. A three-pole microstrip filter and two-pole patch filter were fabricated and tuned. Depending on the local electromagnetic-field distribution, the center frequency shifted toward either the lower or higher end in dielectric tuning. See “Mechanism Study of Mechanical Tuning in HTS Filter Application,” Microwave and Optical Technology Letters, July 2007, p. 1565.

About the Author

Nancy Friedrich | RF Product Marketing Manager for Aerospace Defense, Keysight Technologies

Nancy Friedrich is RF Product Marketing Manager for Aerospace Defense at Keysight Technologies. Nancy Friedrich started a career in engineering media about two decades ago with a stint editing copy and writing news for Electronic Design. A few years later, she began writing full time as technology editor at Wireless Systems Design. In 2005, Nancy was named editor-in-chief of Microwaves & RF, a position she held (along with other positions as group content head) until 2018. Nancy then moved to a position at UBM, where she was editor-in-chief of Design News and content director for tradeshows including DesignCon, ESC, and the Smart Manufacturing shows.

Sponsored Recommendations

Forging the Future of Defense

Oct. 11, 2024
Raytheon’s Advanced Technology team incubates capabilities that fuel the future of defense. Together with leading research and development organizations, def...

Phase-Matched Cable Assemblies

Oct. 8, 2024
Phase-matched cable assemblies are ubiquitous, and growing in popularity. Electrical length matching requirements continue to tighten and the mechanical precision of cable construction...

3 New Wideband MMIC LNAs Cover 5.5 to 20 GHz

Oct. 8, 2024
Mini-Circuits’ expanded PMA3-series of wideband, ultra-low NF MMIC amplifiers operates in ranges between 5.5 and 20 GHz.

Wideband Amplifiers Variable and Temperature-Compensated Gain

Oct. 8, 2024
Many types of RF systems and applications that span from the upper end of microwave frequencies to the lower end of mmWave have arisen in recent years. Meeting system requirements...