- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Electronically controlled beam steering leaky wave antenna in nematic liquid crystal technology
摘要： A novel nematic liquid crystal (LC) technology-based electronically controlled leaky wave antenna (LWA) with microstrip-waveguide conversion working mechanism and wide beam steering range is presented in this article. The LWA is a combination of an inverted microstrip structure and rectangular waveguide. According to the characteristics of LC materials in microwave band, a broadband microstrip-waveguide conversion device is proposed. The gradient slot leaky wave structure is combined with the microstrip-waveguide conversion device to form an electronically controlled LWA with continuous tunable beam. Simulation and experiment results show that the LWA proposed in this article has a 32° beam scanning range at 12 GHz and good impedance matching and stable gain, suggesting the great potential of nematic LC materials for extensive applications in microwave band in the future.
关键词： leaky wave antenna (LWA),microstrip-waveguide conversion,beam steering,nematic,liquid crystal (LC)
更新于2025-09-23 15:19:57
-
Liquid crystal-based aptasensor for the detection of interferon-γ and its application in the diagnosis of tuberculosis using human blood
摘要： We report the development of a liquid crystal (LC)-based aptasensor for the detection of interferon-γ (IFN-γ) in human blood as well as the diagnosis of tuberculosis (TB). In this system, the binding of IFN-γ to an aptamer immobilized on a surface disrupts the orientation of LCs, inducing a transition from a homeotropic orientation to a random one. This change in the orientation of the LCs can easily be converted and observed as a shift from a dark optical LC image to a bright one under a polarized light microscope. Through this sensing mechanism, IFN-γ levels as low as 1 pM (17 pg/ml) could be detected. This LC-based aptasensor was employed for the diagnosis of TB using blood samples from patients with latent TB. With this LC-based approach, not only could IFN-γ readily be detected, but also latent TB could be diagnosed using human blood simply and effectively without any intricate processes or instrumentation. Therefore, our present research provides a promising IFN-γ sensor with applications in clinical diagnosis of various infectious diseases, and in immunological research.
关键词： Tuberculosis (TB),Interferon-γ (IFN-γ),4-cyano-4′-pentylbiphenyl (5CB),Liquid crystal (LC),Aptamer,Human blood sample
更新于2025-09-09 09:28:46