We present the characterization of commercial tunnel diode low-level microwave power detectors at room and cryogenic temperatures. The sensitivity as well as the output voltage noise of the tunnel diodes is measured as functions of the applied microwave power. We highlight strong variations of the diode characteristics when the applied microwave power is higher than a few microwatts. For a diod...

This paper proposes a rate adaptation scheme (RAS) for a wireless local area network (WLAN) station powered with microwave power transmission (MPT). A WLAN station attempting to transmit data frames when exposed to microwave radiation for MPT, experiences a reduction in the physical (PHY) layer data rate because frames are lost even when the carrier sense mechanism is used. The key idea of the ...

We investigated microwave-stimulated fixation of tissues for transmission electron microscopy using a domestic microwave oven operating at a frequency of 2.45 GHz with an output power of 500W. Microwave-stimulated fixation, in 4% glutaraldehyde, of fresh rat kidney, liver, heart and brain tissues was compared to conventional fixation. Human renal biopsies were similarly studied. Electron micros...

High Power microwave vacuum windows are an essential component in developing 1 MW/CW gyrotrons. The thesis focuses on thermal and mechanical analysis of three different microwave window designs. These include the present double disk window, a distributed window being developed by General Atomics and a single-disk diamond window design. The output microwave window is currently the limiting facto...

Semiconductor lasers are known to undergo significant changes in their output characteristics when subjected to external optical perturbations such as near-resonant injection from an external source or optical feedback. Over a range of operating conditions, the perturbations can induce a periodic pulsating output where the pulsation frequency can be controlled by the bias point of the laser(s),...

RF and microwave power measurement is critical at every stage of the radar system lifecycle, helping to ensure the basic performance of the system is met. Today’s test engineers are challenged to deliver comprehensive test results within the tightest schedule. Moreover, test coverage is not allowed to be compromised with the reduction in scheduled test time. These factors now force engineers to...

In this paper, a novel 3D model is proposed to describe the temperature distribution of the thermoelectric microwave power sensor. In this 3D model, the heat flux density decreases from the upper surface to the lower surface of the GaAs substrate while it was supposed to be a constant in the 2D model. The power sensor is fabricated by a GaAs monolithic microwave integrated circuit (MMIC) proces...

A new approach of utilizing microwave to pattern gradient concentric silver nanoparticle ring structures has been presented. The width and height of a single ring and the space between adjacent rings can be adjusted by changing the silver colloidal concentration and the microwave output power. By simply enhancing the ambient vapour pressure to the saturated value during microwave-assisted evapo...

Nowadays, microwave technology is critical in the areas of high RF power for microwave radar and communication transmitter applications. In these applications, microwave device is adopted to produce high RF power levels at high frequency and to operate at high temperature for designing the front-end high power amplifier (HPA) of the transmitter. In addition to the high RF output power, power ad...