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An X-band VCO is designed by employing a compact tunable high-Q negative-resistance resonator. The implemented active resonator not only provides a high degree of frequency-selectivity, but also initiates and sustains the oscillations. The loaded-quality-factor of the resonator is 510. As a result, a simple and compact VCO has been designed by eliminating the need for the parallel feedback amplifier...
Thin-film resistor loaded resonator is quite suitable to equalizer designing which can make the gain character of the TWTA linear. In order to match the given attenuation curve respectively, it's attenuation and quality factor should be adjustable besides the frequency is adjustable. So resistor loaded resonator is chosen. Good results were obtained in the experiment and simulation. Resonator is the...
A new SlW-based circular cavity resonator is proposed which is excited by a microstrip line and a via probe. This SIW cavity component is evaluated as a resonator (for usage in electronic circuits like a VCO) and as a cavity-backed antenna, due to the slot created on the top surface of the cavity for the feed line. The resonator has a simulated gain of over 5dB at 16.13GHz when used as an antenna...
Loading of microstrip antennas provides dual frequency, tenability and compactness. In this paper a theoretical method is developed to calculate various parameters of loaded annular ring antenna via. Shorting pins. The pins are located symmetrically i.e. equispaced along the circumference of the annular ring. Various parameters such as input impedance, bandwidth, return loss, quality factor and radiation...
The proposed nondestructive method is used for the accurate detection of complex permittivity and adulteration in petroleum liquid. The microstrip straight resonator is used to record the resonant frequency shift and Quality factor change for different percentages of ethanol in gasoline. The instrument prototype with the necessary GPIB interface and the network analyzer is used for the efficient and...
A basic rectangular microstrip patch antenna can be miniaturized by inserting a number of slits parallel to the radiating edges. A frequency reduction of up to 80% and an area reduction up to 97% can be observed, depending on the length of the slit. For all the above cases, the resultant antennas can be characterized as ldquosmall antennasrdquo since the Chu and Wheeler limit is satisfied. Nevertheless,...
This paper presents a novel miniaturized microstrip hairpin resonator and applies it to the design of an X-band oscillator. The measurement of the resonator itself shows that the suggested resonator provides a higher loaded quality factor with reduced circuit area compared to the conventional hairpin resonator. The oscillators are designed to operate at 9.2 GHz using the conventional and novel hairpin...
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