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Fast tuning of a new evanescent-mode cavity tuner is demonstrated to optimize amplifier device power-added efficiency in simulations. The tuning is accomplished by adjusting the two resonant frequencies of the two-element tuner network with a modified interval halving approach. The tuner model is used to adjust the load impedance presented to a power amplifier device. Simulation results show that...
A new approach is introduced for wireless detection of electromagnetic signals generated at low frequencies on macula by light pulses. The signal detection is based on a resonant condition created externally and no part of the device touches the patient. Since most biological signals are excited at low frequencies, the proposed method will be applicable to other wireless detection systems including...
This work presents the study of a 5 GHz synthesized Chebyshev combline filter and its potential use in a self-structuring filter prototype. The self-structuring filter prototype will be a system where the center frequency and bandwidth can be controlled by an algorithm to produce the desired bandpass filter response. The impact of tuning capacitances on the insertion loss, 3 dB bandwidth and percent...
In this paper, we present two microwave devices at 1 GHz for next-generation wireless communication systems. The first device is a magnet-less circulator that consists of three resonant branches connected in a delta topology and spatio-temporally modulated with 120 deg phase difference between each other. The proposed circulator is fully compatible with standard CMOS technologies and holds the promise...
Low-profile, power-efficient antennas are required for body-worn devices applicable for long-term healthcare monitoring. The paper is focused on the fabrication of fold cylindrical helix (FCH) antennas, and measurement of their performance on the human body. The study considers one-element and two-element FCH arrays. It is found that the fabricated FCH antenna can excite the same on-body propagation...
This paper presents a coplanar waveguide (CPW) based tunable transmission line (TTL) for broadband operation in mm-wave band such as the 5G generation of communication systems. The design consists of a conventional CPW on the top aluminum layer with inductance and limited capacitance tuning mechanisms using MOS switches. The 3D electromagnetic (EM) simulation of a sample TTL of size 500×1000 μm indicate...
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