RF power output has been a major planning aspect for engineers since the start of radio transmission. Undoubtedly important, RF Power level is only one of many factors that determine a successful wireless network. To effectively evaluate and differentiate between various microwave systems and link performance, operators should be able to examine several key aspects of RF power output. Propagati...

a power divider (pd)/ power combiner (pc) with high quality factor and enhanced output ports isolation using substrate integrated waveguide (siw) technology is proposed. an siw cavity is designed to provide a high quality factor filtering response and an smd resistor is attached between two output ports to realize the high isolation. the value of the applied resistor is calculated by using the ...

The design of high power microwave amplifier involves three main components; namely the two port network, input matching and output matching circuits. All the components are formed by establishing the scattering parameters, followed by selecting appropriate reflection coefficient for the matched circuits. The characteristics of the design are based on Wireless Power Transmission prototype for t...

drying characteristics of green pea (pisum satium) with an initial moisture content of 76% (db) was studied in a fluidized bed dryer assisted by microwave heating. four drying air temperatures (30, 40, 50 and 60ºc) and five microwave powers (180, 360, 540, 720 and 900w) were adopted. several experiments were conducted to obtain data for sample moisture content versus drying time. the results sh...

Abstract: Class-F microwave monolithic integrated circuit (MMIC) power amplifiers (PA) fabricated in a GaN technology are reported. Field-plated GaN HEMT devices are used for highpower performance. Two MMICs are reported. The first class-F MMIC PA operating at 2.0GHz achieved a power-added efficiency (PAE) of 50% with 38dBm output power and 6.2W/mm power density. A second class-F PA operating a...

A low-temperature-grown GaAs interdigitated-electrode photomixer is used to generate coherent power at microwave frequencies. An output power of 200 PW ( 7 dBm) is generated by pumping the photomixer with two 70-mW modes of a Ti:Al,Qs laser, separated in frequency by 200 MHz. This represents an optical-to-microwave conversibn efficiency of 0.14%, which is within 50% of a prediction based on opt...

A four-device broadband solid-state power amplifier, which is based on radial waveguide power-dividing/combining circuit, has been investigated in this work. The fabricated power amplifier combining four monolithic microwave integrated circuit power amplifiers shows a 12–16.6 dB small-signal gain over a broadband from 6 to 14 GHz. The measured maximum output power at 1 dB compression is 25.6 dB...

in this study, green pepper was dried by a laboratory scale microwave-convective dryer. the effects of microwave power on drying rate, effective moisture diffusivity, and energy consumption of green pepper were studied at four different microwave powers of 180, 360, 540, and 720w. the drying data were fitted to the four thin-layer drying models. the moisture reduction of the green pepper sample...

In this paper, we present a “smart” high-peak power microwave tube, by implementing iterative learning control methodologies to control a repetitively-pulsed, high-power, backward wave oscillator. The learning control algorithm is used to drive the error between the actual output and its desired value to zero. The desired output may be a given power level, a given frequency, or a combination of...

The work presented describes the characteristics of single stage and severed high-efficiency, high-power traveling-wave tube amplifiers operating in X band at 8.76 GHz. Average amplified output powers of 210 MW have been achieved at 24% efficiency. At high output power levels ( > 100 MW) sidebands develop increasing the average radiated power to over 400 MW with a microwave conversion efficienc...