Results 41 to 50 of about 4,418 (227)
Design of an S-Band Diplexer for Telemetry and Telecommand Subsystems in LEO Satellites [PDF]
فصلنامه علوم و فناوری فضاییThis study investigates the design requirements for telemetry and telecommand subsystems in satellites operating in low Earth orbit (LEO) and outlines the specifications for a diplexer suited for the S-band frequency range.
Behzad Ahmadi +2 more
doaj +1 more source
IEEE Photonics Journal, 2021 A high-contrast and compact wavelength diplexer is presented for conventional 1550 nm and emerging 2000 nm based on a subwavelength-grating (SWG) coupler. The SWG silicon waveguide thoroughly blocks the light propagation around 1550 nm but fully supports
Danfeng Zhu +4 more
doaj +1 more source
Redundant RF system for space application [PDF]
, 1979 An S-band radio frequency subsystem is described including two transmitters, two receivers and two antennas. The subsystem is capable of connecting either transmitter or receiver to either antenna while permitting simultaneous operation of a transmitter ...
Rook, C. W.
core +1 more source
Monolithic Terahertz Topological Mach‐Zehnder Interferometer
Advanced Materials, Volume 37, Issue 37, September 18, 2025.A monolithic topological Mach‐Zehnder interferometer (MZI) is presented, integrating the splitter, combiner, and waveguide arms on a single chip. The interferometric fringes exhibiting high on‐off contrast with extinction ratios over 20 dB are achieved by utilizing tailored unit cells that facilitate interface‐dependent out‐of‐plane radiation losses ...
Nikhil Navaratna +3 more
wiley +1 more source
Terahertz hot electron bolometer waveguide mixers for GREAT
, 2012 Supplementing the publications based on the first-light observations with the German Receiver for Astronomy at Terahertz frequencies (GREAT) on SOFIA, we present background information on the underlying heterodyne detector technology.
Bardin +22 more
core +1 more source
W-Band GaAs HEMT MMIC Subharmonically Pumped Diode Mixers with 20 GHz IF Bandwidth [PDF]
, 2002 Two subharmonically pumped (SHP) diode mixers are designed for wideband W-band RF frequencies, fixed LO frequency operation. These mixers are fabricated on a 4-mil substrate using 0.1- µµµµm GaAs MMIC process.
Chu, Tah-Hsiung +2 more
core +1 more source
Design Procedure for Interdigital Waveguide Bandpass Filters Based on Flat Metallic Strips
Radio Science, Volume 60, Issue 3, March 2025.Abstract In this work, we describe a new topology for interdigital bandpass filters implemented in waveguide technology. Compared to classical coaxial resonators, which are typically based on cylindrical metallic posts, the resonators that we propose are based on rectangular boxed cavities loaded with flat metallic strips of a finite thickness.
R. García +6 more
wiley +1 more source
Phase conjugation method and apparatus for an active retrodirective antenna array [PDF]
, 1979 An active retrodirective antenna array wherein a reference array element is used to generate a phase reference which is replicated at succeeding elements of the array.
Chernoff, R. C., Tausworthe, R. C.
core +1 more source
Three‐Way Equal Filtering Power Divider for Modern Communication Systems
Engineering Reports, Volume 7, Issue 1, January 2025.A balanced three‐way filtering power divider that receives input power and delivers equal amount of output to its three output ports is developed and realized using microstrip technology. The design is well‐suited for modern communication systems due to its low insertion and return losses, sharp selectivity, and integrated filtering capability ...
Augustine O. Nwajana, Rose Paul
wiley +1 more source
, 1977 A method and apparatus for the automatic, remote measurement of the internal delay time of a transponder at the time of operation is provided. A small portion of the transmitted signal of the transponder is converted to the receive signal frequency of ...
Anderson, R. E. +2 more
core +1 more source