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A Wide Passband Frequency-Selective Surface with a Sharp Roll-Off Band Using the Filtering Antenna-Filtering Antenna Method.
Materials (Basel)
December 2024
Key Laboratory of Near-Range RF Sensing ICs and Microsystems (NJUST), Ministry of Education, School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Frequency-selective surfaces (FSSs) have attracted great attention owing to their unique feature to manipulate transmission performance over the frequency domain. In this work, a filtering antenna-filtering antenna (FA-FA) FSS with a wide passband and double-side sharp roll-off characteristics is presented by inter-using the filtering antenna and receiving-transmitting metasurface methods. First, a dual-polarized filtering antenna element was designed by employing a parasitic band-stop structure with an L-probe feed.
View Article and Find Full Text PDFPredictive Accuracy of Wideband Absorbance under Various Pressure Conditions in Identifying Infants with a Conductive Hearing Loss.
J Am Acad Audiol
July 2024
Department of Audiology, Monash Health Melbourne, Victoria, Australia.
Objective: The objectives of the study were to (i) evaluate the effectiveness of wideband absorbance (WBA) at ambient pressure (WBA), tympanic peak pressure (WBA), and 0 daPa (WBA) to identify conductive hearing loss (CHL) in infants and (ii) compare the sensitivity and specificity of the three WBA tests with that of high-frequency tympanometry (HFT) and transient-evoked otoacoustic emissions (TEOAE).
Method: A total of 31 ears with hearing thresholds no greater than 20 dB HL (reference group from 20 infants [mean age: 3.1 weeks]) and 47 ears with CHL from 31 infants (mean age: 3.
Ultraflexible Neural Electrodes Enabled Synchronized Long-Term Dopamine Detection and Wideband Chronic Recording Deep in Brain.
ACS Nano
December 2024
State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
Ultraflexible neural electrodes have shown superior stability compared with rigid electrodes in long-term recordings, owing to their low mechanical mismatch with brain tissue. It is desirable to detect neurotransmitters as well as electrophysiological signals for months in brain science. This work proposes a stable electronic interface that can simultaneously detect neural electrical activity and dopamine concentration deep in the brain.
View Article and Find Full Text PDFAn experimental system for detection and localization of hemorrhage using ultra-wideband microwaves with deep learning.
Commun Eng
September 2024
Center for Advanced Imaging Innovation and Research (CAI2R), New Yorsity School of Medicine, New York, NY, USA.
Stroke is a leading cause of mortality and disability. Emergent diagnosis and intervention are critical, and predicated upon initial brain imaging; however, existing clinical imaging modalities are generally costly, immobile, and demand highly specialized operation and interpretation. Low-energy microwaves have been explored as a low-cost, small form factor, fast, and safe probe for tissue dielectric properties measurements, with both imaging and diagnostic potential.
View Article and Find Full Text PDFUltra-Wideband Circular Polarized Implantable Patch Antenna for Implantable Blood Glucose Detection System Applications.
Sensors (Basel)
August 2024
The School of Electrical Engineering, Xinjiang University, Huarui Street 777#, Shuimogou District, Urumqi 830047, China.
To address the current demands for antenna miniaturization, ultra-bandwidth, and circular polarization in advanced medical devices, a novel ISM band implantable antenna for blood glucose monitoring has been developed. This antenna achieves miniaturization by incorporating slots in the radiation patch and adding symmetric short-circuit probes, resulting in a compact size of only 0.054λ × 0.
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