Results 41 to 50 of about 152,070 (212)
Varactor diode assembly with low parasitic reactances [PDF]
, 1975 Development of varactor diode assembly overcomes parasitic reactances of conventional varactor packages. In specially constructed assembly very high idler-frequency to signal-frequency ratios are used to obtain low-noise operation over maximum ...
Dickens, L. E.
core
A tunable metamaterial absorber using varactor diodes
New Journal of Physics, 2013 We present the design, analysis and measurements of a polarization-insensitive tunable metamaterial absorber with varactor diodes embedded between metamaterial units.
Jie Zhao +5 more
doaj +1 more source
Recent Advances in Programmable Metasurfaces and Meta‐Devices
Advanced Electronic Materials, EarlyView.Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao +4 more
wiley +1 more source
Frequency reconfigurable antenna based on epsilon negative transmission lines
Electronics Letters, 2023 A novel coplanar waveguide (CPW)‐fed frequency reconfigurable antenna based on epsilon negative transmission line (ENG‐TL) is presented in this letter.
Hao‐nan Luo, Xiao‐lin Yang
doaj +1 more source
Applied Sciences, 2021 In this study, a new concept for a Ka-band 5G communication tunable reflector metasurface (MS) for beam steering at 28 GHz is proposed. Varactor diodes are used as the tunability component of each unit cell of this MS.
Efi Rahamim +2 more
doaj +1 more source
Advanced Electronic Materials, EarlyView.A compact passive engineered surface converts changes in microwave frequency into many distinct illumination patterns, allowing nearby objects to be imaged without mechanical scanning, active tuning, or a large antenna array. Operating from 18 to 28 GHz, the single‐port system uses measured field patterns to reconstruct metallic targets and distinguish
Mohammed H. Arif +6 more
wiley +1 more source
Device for diode tuning in a stripline varactor harmonic multiplier [PDF]
, 1969 Stripline varactor harmonic multiplier uses a device for positioning the varactor diode with respect to the stripline circuit to obtain series resonance.
Steele, K. P.
core
A Reconfigurable MIMO/UWB MIMO Antenna for Cognitive Radio Applications
IEEE Access, 2019 A novel multi-mode frequency reconfigurable MIMO and an ultrawideband (UWB) MIMO antenna design for cognitive radio applications is proposed in this paper.
Xiongwen Zhao +2 more
doaj +1 more source
Toward Sub‐Terahertz: Space‐Time Coding Metasurface Transmitter for Wideband Wireless Communications
Advanced Science, 2023 A space‐time coding metasurface (STCM) operating in the sub‐terahertz band to construct new‐architecture wireless communication systems is proposed. Specifically, a programmable STCM is designed with varactor‐diode‐tuned metasurface elements, enabling ...
Yujie Liu +12 more
doaj +1 more source
Physical Unclonable Functions From Microwave Metasurface Fingerprints
Advanced Electronic Materials, EarlyView.Nominally identical metasurfaces fabricated through standard PCB processes inevitably contain microscopic fabrication imperfections. This work demonstrates that these unavoidable electromagnetic deviations can serve as unique physical unclonable fingerprints for wireless authentication.
Guanxiong Shen +4 more
wiley +1 more source