L-Band MMICs for Space-based SAR system

The design and performance of an L-Band GaAs chip-set is presented.The chip-set consists of a 6-bit attenuator circuit,a Low-Noise Amplifier (LNA)and a Multi Function Chip that is the combination of a 6-bit attenuator and 6-bit Phase shifter circuit.The chip-set is developed for the pre-flight engineering T/R (Transmit and Receive)modules currently in development with Astrium in a space-based SAR (Synthetic Aperture Radar)system.The MMICs are realised in the 0.25 µm PHEMT (PH25)technology of UMS.Only one iteration was needed for the MMICs in order to be fully compliant with the specifications

A multi-channel S-band FMCW radar front-end

This paper describes the design and performance of a low-cost synthesized FMCW radar module, operating in S band. The bi-layer PCB contains a frequency-agile low phase-noise synthesizer and three identical coherent receive-channels. The transmit channel has an automatic power control system that reduces the output power when a large reflection causes the receiver input level to exceed the linear input range. Standard surface-mount components from commercial WLAN applications have been used to create a versatile programmable radar module. The DDS-based PLL synthesizer achieves a SSB phase-noise level of -101 dBc/Hz · 10 kHz offset from a 2.4 GHz carrier. A basic serial PC interface enables control of the FMCW radar parameters that can be stored in the on-board non-volatile memory. The complete front-end operates from a single 3.6-5.5 Volts supply, drawing 220 mA and measures only 55 × 100 m

A low-noise X-band microstrip VCO with 2.5 GHz tuning range using a GaN-on-SiC p-HEMT

A low-noise X-band microstrip hybrid VCO has been designed and realised using a 2 x 50 µm GaN-on-SiC pseudo-morphic HEMT as the active device. The transistor has been manufactured by TIGER and features a gate-length of 0.15 µm, an fT of 22 GHz, a break-down voltage of 42 Volts and an Idss close to 1 A/mm. The VCO has been assembled with standard SMD reflow and chip-on-board technology on Rogers 4003 substrate material. The circuit is biased at +15 Volts and 38 mA and has a measured tuning range from 8.1 to 10.6 GHz, an output power level of +19 dBm and an average phase-noise level of -114 dBc/Hz @ 1 MHz offset

Binding Features of Molecular Clips Derived from Diphenylglycoluril

Contains fulltext : 10114.pdf (publisher's version ) (Open Access

Multi-Mode FMCW Radar Array with Independent Digital Beam Steering for Transmit and Receive

A phased-array FMCW radar has been design and built from COTS components. The generation of the frequency sweep is done by mixing a central local oscillator signal with a baseband sweep of a direct digital synthesizer (DDS). To ensure maximum flexibility the receive side has been equipped with it's own swept signal. The transmit frequency generation and receive frequency generation are derived from the same local oscillator signal and clock to ensure coherent operation. This architecture makes a very flexible platform as the waveforms can be changed, transmit and receive and be independently programmed and the system is scalable, also by the mechanical outline of the system and antenna

Real time indoor presence detection with a novel radar on a chip

A novel FMCW radar on a chip operating in the 24 GHz band has been used for presence detection in an office environment. Real time detection of small movements (i.e. typing) has been demonstrated. A comparison of the performances of the radar sensor and of the traditional intelligent lighting PIR sensor has been carried out. While the radar is able to detect a movement of 1 cm along the radial direction, the PIR sensor can detect mainly larger movements along the tangential direction, showing the complementarity of these two sensors. Both sensors have a reaction time of less than 200 ms. © 2014 IEEE

Industrial wind turbine noise:the association with human health

Climate targets will provide the Netherlands with more and higher industrial wind turbines that produce various 'side effects', including noise pollution and annoyance. Especially low-frequency noise and infrasonic vibrations can be detected more than 10 km away. In neighbouring residential areas, long-term exposure, especially at night, leads to sleep disturbances, with secondary symptoms, that may be associated with, for example, delay in cognitive development of children. More research is needed.</p