Patent
Continuous phase shifter for a phased array hyperthermia system
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TLDR
In this article, a continuous microstrip phase shifter suitable for use in a phased array microwave hyperthermia system operating at 915 MHz is provided, which utilizes a three dB quadrature hybrid coupler in conjunction with microstrip lines to change the phase of a transmitted wave.Abstract:
A continuous microstrip phase shifter suitable for use in a phased array microwave hyperthermia system operating at 915 MHz is provided. The phase shifter utilizes a three dB quadrature hybrid coupler in conjunction with microstrip lines to change the phase of a transmitted wave. The phase change is introduced through the reflection ports of the coupler which are loaded with identical parallel resonant circuits. An abrupt junction varactor capacitance in parallel with a distributed inductance forms a voltage-tunable resonant circuit. The resonant element values are chosen to give a specified continuous phase variation with minimum transmission loss. This is accomplished without additional microwave circuit elements.read more
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Patent
Electrically controllable impedance matching device for use in RF amplifier
TL;DR: In this paper, an electrically controllable impedance matching device for matching an impedance of a signal output from a signal generator in an RF (Radio Frequency) amplifier is presented, which includes a 3-dB directional coupler having a coupling terminal, a through terminal, an isolation terminal being an output terminal, and an input terminal connected to the signal generator.
Proceedings ArticleDOI
Low-loss 360 degrees X-band analog phase shifter
J.I. Upshur,Bernard D. Geller +1 more
TL;DR: In this paper, a low-loss reflection-type analog phase shifter circuit is described, and experimental results are presented, which incorporates several design features to produce nearly 360 degrees of phase shift at X-band while achieving an insertion loss of only 4.8 dB with + or 0.5 dB of variation over all phase states.
Patent
Micro electro-mechanical system (mems) phase shifter
TL;DR: In this article, the phase shifter includes a quadrature coupler having an input port, an output port, a first load port and a second load port, each variable reactance has a plurality of reflecting phase shifting elements each having an associated micro electro-mechanical system (MEMS) switching element to individually and selectively couple the reflecting phase shif element to the appropriate load port.
Patent
Reflection-type phase shifter having reflection loads implemented using transmission lines and phased-array receiver/transmitter utilizing the same
Ming-Da Tsai,Arun Natarajan +1 more
TL;DR: In this article, a reflection-type phase shifter with a coupler, a first reflection load, and a second reflection load is provided, where at least one of the first and second reflection loads is equivalent to a transmission line.
Patent
Microwave phase shifter including a reflective phase shift stage and a frequency multiplication stage
TL;DR: In this paper, a phase shifter/modulator which provides linear phase control of a microwave continuous wave carrier signal is presented, where a reference signal, at a subharmonic of the output carrier signal frequency, is injected into a highly linear fractional range reflection type phase shifters and this fractional phase modulated signal is input to a field effect transistor based frequency/phase multiplier.
References
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Patent
Wide range variable phase shifter
TL;DR: A variable phase shifter having a substantially wide phase shift variation range is formed of more or less standard circuit elements such as inductors, capacitors, quadrature hybrids and variable capacitors as mentioned in this paper.