The effects of highly out-of-band electromagnetic interference (EMI) on an RF front-end are experimentally evaluated. Irradiation at 60GHz with a moderate power is produced in the near-field owing to an open-ended WR15 waveguide fed by a Gunn diode. Surprisingly, we easily obtain the remote extinction of either the transmitter or the receiver of the front-end subject to EMI. The paper proposes ...

This paper presents a microwave reflectometer using self-mixing oscillator antennas. A unique characteristic of the proposed reflectometer is its simple structure without a circulator and a directional coupler. Each self-mixing oscillator antenna utilizes a Gunn diode as an active device and a rectangular waveguide as a resonator and a radiator. The determination of dielectric properties of mat...

A low-cost, high-performance -band Gunn diode oscillator for educational and research purposes has been developed. The cavities have been manufactured on a standard WR90 rectangular waveguide with UBR100 flange in order to make it compatible with the waveguide circuitry usually available in a basic microwave laboratory. The capability of sweeping the whole band at constant output power and low ...

We present experimental evidence and physics-based simulations of the lock-on effect in high-voltage GaAs avalanche diodes . The triggering is initiated by steep voltage ramp applied to diode in-series 50 ? load. After subnanosecond switching reversely biased remains conducting state for whole duration pulse (dozens nanoseconds). There no indication p-n junction recovery that commonly expected ...

In this work, Monte Carlo simulation is performed for InP Gunn diode with a notch-d-doped structure. It found that the presence of d-doped layer has improved performance significantly as compared to conventional notch The effect caused an increment in fundamental operating frequency and current harmonic amplitude diodes by modifying electric field profile within device. An device length 800 nm ...

Marcus-gunn phenomenon is a congenital and sometimes hereditary anomaly, in which a ptotic eyelid retracts momentarily when the mouth is open, or the jaw is moved. These associated movements attributed to abnormal connections between the central mechanisms innervating the pterygoid and elevator muscles. Sometimes this anomaly is associated with dual,s retraction syndrome, duplex kindneys and ur...

Materials exhibiting negative differential resistance have important applications in technologies involving microwave generation, which range from motion sensing to radio astronomy. Despite their usefulness, there has been few physical mechanisms giving rise to materials with such properties, i.e. GaAs employed in the Gunn diode. In this work, we show that negative differential resistance also ...