A5050987825- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Ear and Head Tumors
- Antenna Design and Optimization
- Head and Neck Cancer Studies
- Photonic and Optical Devices
- Salivary Gland Tumors Diagnosis and Treatment
- Full-Duplex Wireless Communications
- Radio Frequency Integrated Circuit Design
- Energy Harvesting in Wireless Networks
- Electromagnetic Compatibility and Noise Suppression
- Spectroscopy and Laser Applications
- Electromagnetic wave absorption materials
- Graphene research and applications
- Photonic Crystals and Applications
- Gyrotron and Vacuum Electronics Research
- Acoustic Wave Resonator Technologies
- Laser Design and Applications
- Microwave and Dielectric Measurement Techniques
- RFID technology advancements
- Atmospheric and Environmental Gas Dynamics
- Electromagnetic Simulation and Numerical Methods
Xidian University
2016-2025
Hefei Institutes of Physical Science
2021-2025
Chinese Academy of Sciences
2012-2025
Anhui Institute of Optics and Fine Mechanics
2005-2025
Yan'an Hospital Affiliated To Kunming Medical University
2025
Kunming Medical University
2025
Radar (United States)
2024
First People's Hospital of Yunnan Province
2024
South China Normal University
2022-2024
Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area
2024
Abstract The development of transparent radio-frequency electronics has been limited, until recently, by the lack suitable materials. Naturally thin and graphene may lead to disruptive innovations in such applications. Here, we realize optically broadband absorbers operating millimetre wave regime achieved stacking bearing quartz substrates on a ground plate. Broadband absorption is result mutually coupled Fabry-Perot resonators represented each graphene-quartz substrate. An analytical model...
Numerous studies have been made to design switchable terahertz absorber for the application of amplitude modulator. However, it is still a challenge achieve large modulation range while maintaining broad bandwidth. Here, we propose broadband absorber/reflector in low-terahertz regime. By utilizing hybrid graphene-gold metasurface on SiO2/pSi/PDMS substrate with an aluminum back, excellent absorption across 0.53-1.05 THz wide incident angles both TE and TM polarizations achieved. controlling...
A tri-band bandpass filter using stub loaded resonator (SLR) and defected ground structure (DGS) is proposed in this letter. The DGS on the lower plane constructs first pass-band, SLR upper forms second third pass-bands, which a loop properly used to provide coupling between SLRs. three pass-bands are combined together with common T-shaped feed line, reasonable tuning method adopted tune smooth responses. compact centered at 2.45, 3.5, 5.25 GHz designed fabricated. measurement results agree...
Radar-absorbing materials are used in stealth technologies for concealment of an object from radar detection. Resistive and/or magnetic composite to reduce the backscattered microwave signals. However, nontunable characteristics or required complex structure hampered application these materials. Here, multilayer graphene-based frequency selective surfaces (MLGFSS), which reach a size 150 mm × mm, designed and fabricated. By properly changing growth temperature MLG using chemical vapor...
This paper presents a substrate integrated waveguide Butler matrix with modified hybrid coupler, operating from 28 to 32 GHz. The coupler is realized by using 90° followed -45° compensating phase shifter. Thus, 45°/135° output differences can be obtained this type of coupler. Compared the equal-length unequal-width shifter, shifter exhibits better characteristics, only 3° error over 28-32 Because not taking introduced crossover as reference, it gives great flexibility design Adopting...
In this communication, a millimeter-wave (MMW) pattern reconfigurable Vivaldi antenna utilizing graphene-based tunable resistor is proposed. First, modified with high front-to-back ratio achieved by equal proportion slotting on the ground patch. Then, consisting of pair back-to-back antennas two graphene nanoplate pads symmetrically loaded feed line proposed to realize dynamical manipulation gain. By applying bias voltage from 0 4 V, resistance pad can be gradually reduced 200 20Ω. Two slots...
A low-profile circularly polarized wearable antenna with flexible performance and reduced specific absorption rate (SAR) based on graphene is presented. The adopts highly conductive film polydimethylsiloxane substrate, which have good flexibility, mechanical stability, light weight. operating at 5.8 GHz a profile of 0.05 λ designed fabricated, retains reflection coefficient less than -10 dB when loaded the human body. measured results indicate axial-ratio (AR) bandwidth for AR<; 3 covers...
This paper presents a novel approach for designing dual-mode dual-band bandpass filters using capacitance loaded square loop resonators (CLSLR). The CLSLR features compactness and spurious response suppression because of the capacitance. A is obtained via an extremely large perturbation in single resonator second-order are realized by new cascading principle. Coupling coefficients between two both bands can be controlled independently external quality factors also particularly-designed...
A double-layer wideband transmitarray antenna using two degrees of freedom (TDF) elements is presented. The composed 441 elements. Each element includes four metal vias and patches with TDF printed on both sides the dielectric substrate. Four are used to achieve maximum transmission magnitude adopted obtain a sufficiently large variation range phase shift. square transmittarray designed, fabricated, measured validate proposed design. simulation measurement results have good agreement....
Here we experimentally study the microwave absorption and near-field radiation behavior of monolayer few-layer, large-area CVD graphene in C X bands. Artificial stacking reduces sheet resistance, as verified by non-contact cavity measurements four-probe DC resistivity. The multilayer stacked exhibits increased determined total resistance. underlying mechanism could enable us to apply nanoscale sheets optically transparent radar absorbers. Near-field show that our present few-layer patches...
In this letter, X/Ku dual-band single-layer reflectarray antenna is presented. The proposed operates in two separated bands with separate feeds. element composed of a split ring phase delay lines and phoenix patch. patch are designed for operation at X- Ku-bands, respectively. selected as the lower frequency because large enough internal space. shift these elements does not depend on variation external size, which provides feasible method designing elements. band obtained by changing...
The risk of adverse events from ascending thoracic aorta aneurysm (TAA) is poorly understood but drives clinical decision-making.To evaluate the association TAA size with outcomes in nonsyndromic patients a large non-referral-based health care delivery system.The Kaiser Permanente Thoracic Aortic Aneurysm (KP-TAA) cohort study was retrospective at Northern California, fully integrated system insuring and providing for more than 4.5 million persons. Nonsyndromic regional safety net tracking...
Atomic heterodyne dressed by a local oscillator resonant with Rydberg transitions allows high sensitivity and robust phase measurement of microwave electric field, but it is typically limited to detection discrete frequencies within the narrow bandwidth transitions. Here we demonstrate an atomic scheme for continuous-frequency field based on multilevel atoms in room-temperature vapor cell. Driven two off-resonant microwaves acting as tunable receiver can retrieve amplitude, phase, frequency...
This letter presents a novel stub-loaded quad-mode resonator. Due to the structure geometry, even-odd-mode analysis is applied twice explain modal characteristics. Each of four modes equivalent circuits quarter-wavelength resonator, so resonator has compact size. The stub-to-stub coupling introduced split two identical odd-modes. Meanwhile, these stubs are folded inward, and new transmission zero produced, which separates into parts corresponding passbands: first one formed by even-modes,...
Reduced graphene oxide (rGO) has been studied as a resistive ammonia gas sensor at room temperature. The sensitive hybrid material composed of rGO and nano-silver ink (Ag-ink) was loaded on microstrip patch antenna to realize high-performance wireless sensors. investigated using scanning electron microscopy (SEM) X-ray photoelectron spectroscopy (XPS). Firstly, interdigital electrodes (IDEs) printed the polyethylene terephthalate (PET) by direct printing were employed measure variation...
In this article, a dynamically tunable graphene-based absorber in Ku-band is proposed for the first time, center frequency of which can be continuously tuned while maintaining an excellent absorption performance. It consists periodically patterned graphene sandwich structure (GSS) and periodic patches printed on substrate backed with ground. The GSS directly deposited top surface patches. By using external bias voltage, provide operating from 13.9 to 16.4 GHz, absorptions remain above 0.92....
In this communication, a high-gain substrate-integrated waveguide (SIW) filtering patch antenna with low H-plane cross-polarization (cross-pol) and controllable radiation nulls is proposed. The composed of integrated three pairs shorting pins single layer SIW cavity two transverse slots. loaded on the can improve gain reduce cross-pol antenna. long slot middle not only split TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">110</sub> -mode...
A novel dual-polarized frequency-selective rasorber (FSR) using an omnidirectional planar resistor based on graphene flake is presented in this article. The FSR exhibits a low-loss transmission window above absorption band. It consists of lossy layer and lossless bandpass surface (FSS). In the layer, central symmetric graphene-metal hybrid structure formed by connecting four metal strip-based resonant circuits with square flake. low insertion loss band obtained removing resistance out...
In this letter, a novel tunable grounded coplanar waveguide (GCPW) attenuator based on graphene nanoplates is proposed. The consists of 50-Ω GCPW transmission line and three pairs nanoplate pads periodically located in the gap between signal upper metal ground. resistance pad can be tuned from high to low by increasing bias voltage, thus changing attenuation level. Particularly, distance two adjusted achieve good impedance matching different working bands. principle analyzed theory. Two...
A wideband fourth-order filtering antenna consists of two substrate integrated waveguide (SIW) dual-mode cavities is presented in this letter. The first SIW cavity creates resonant nodes and one radiation null (RN) located on the upper stopband. second with a slot cannot only achieve function but also realize resonance, which can produce another lower out-of-band RN. These RNs be controlled to improve frequency selectivity design flexibility. coupling matrix theory adopted guide antenna,...
In this article, we present a via-based hybrid metal–graphene metamaterial absorber with miniaturized periodicity, broad absorption band, and large-angle radar cross Section (RCS) reduction. The unit cell of the is composed cross-shaped graphene film, four metal arrow-shaped patterns, cylindrical vias. By extending length vias folding shape pattern on top, size proposed reduced greatly, while its performance maintains. Furthermore, adopted structure avoids loading multiple lumped elements,...
In this work, an ultra-wideband flexible radar absorber with low infrared emissivity for a radar-infrared bi-stealth application utilizing multilayer patterned graphene is proposed. The proposed consists of three layers films different patterns, substrates, lightweight foam, and ground layer. films, rather than the conventional lumped resistors, are adopted as omnidirectional resistors to achieve dual polarization flexibility. On top absorber, shielding layer (IRSL) Indium tin oxide (ITO)...
In this article, a multilayer reflective polarization conversion metasurface with both high-frequency selectivity and low profile is proposed. The frequency selective (FSPCM) composed of four metal layers separated by three substrates. cross-shaped patch on the top layer connected to folded microstrip line bottom two via holes through circle slots inside ground layers, which converts linearly polarized electromagnetic incident wave into cross-polarized after reflection. second-order response...