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As a standard measurement instrument, a vector network analyzer (VNA) provides high measurement accuracy of signal reflection and transmission for various applications. For some applications, however, there are limitations of using a VNA in terms of cost and bulkiness. This work presents an alternative low-cost mobile instrument for complex permittivity measurement of liquid samples using resonant...
Radio frequency power amplifiers (RF PA) are widely used for several applications e.g. wireless communication, wireless power transmission (WPT) and radio frequency heating. In general, the choice of power amplifier's operating class is based on requirements regarding linearity and power efficiency. For applications in which linearity is not a critical issue whereas high efficiency is desired, switched-mode...
Microwave heating has a long history since the technique was discovered in 1945. Yet this technology still find new applications in several areas including food manufacturing, acceleration of chemical reactions, agricultural post-harvesting processes, extraction and separation of chemical substances, disinfection, etc‥ In order to design a microwave heating system for a specific industry, two important...
To the our best knowledge, this paper presents combination of a rectangular waveguide cavity and closed-end conical coupling probes for characterizing the permittivity of solid material for the first time. The proposed test configuration was designed based on transmission/reflection method to operate at 2.4–2.5 GHz. The design methodology and simulation results are also provided. In order to calculate...
This paper presents design and implementation of a single mode cylindrical microwave cavity for microwave processing of continuously flowing liquids material. The proposed applicator was designed and fabricated to operate in TM010 mode at 2.45 GHz which is in Industrial Scientific and Medical (ISM) frequency bands. A rectangular waveguide was designed to transfer the electromagnetic energy generated...
A 3 GHz TM010 mode cylindrical cavity resonator was designed for measuring complex permittivity of liquid material. To improve the measurement accuracy of cavity perturbation method which occurs from variable size of the samples, the field analysis of TM0n0 cylindrical cavities with two concentric layers of real dielectric at the axis is used. The field analysis method was proposed for calculation...
The class E power amplifier is a prominent switched-mode power amplifier. It is well known as being a high efficiency amplifier that provides a long operation time for mobile and nomadic devices powered by batteries. Moreover, it reduces the power dissipation of power transistor and cooling system requirement. The switching device that is used in the design is an important factor to provide maximum...
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