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This paper presents the design of a wideband (50–350 MHz) low noise amplifier (LNA), employing a bandwidth constrained noise figure optimization technique targeted for a low frequency band Square Kilometer Array radio telescope. In this application, noise figure and power consumption optimization is crucial. In fact, the LNA optimization and analysis considers the effect of the induced gate noise...
A design of conjugated resistive frequency selective surfaces with capacitively coupled phased Fractal Octagonal Rings Array (FR-ORA) has been proposed for low-frequency aperture array radio astronomy. The presence of the resistive loading has expanded the bandwidth of the array to a ratio of 8:1, but at the expense of its radiation efficiency performance (at the high end of its operating frequency)...
This paper presents the radiation pattern of a low-frequency FR-ORA array based on the low-cost planar surface near-field to far-field measurement system. The far-field pattern was obtained from near-field measurements and by using a Fast Fourier Transformation (FFT) algorithm. This technique was used to characterize the radiation pattern of a prototype 4 × 4 fractal octagonal ring antenna array (FR-ORA)...
Ultra-wideband capacitively coupled phased array antennas for low and mid frequency radio astronomy are presented. Two distinct and novel broadband techniques are employed for the candidate current sheet models. One of the arrays is designed to operate from 250 MHz to 1.3 GHz while the other functions from 50 MHz to 400 MHz. The radiating arrays comprise synthetic periodic aperture of fractal plates,...
This paper presents a low profile ultrawideband tightly coupled phased array antenna with integrated feedlines. The aperture array consists of planar element pairs with fractal geometry. In each element these pairs are set orthogonal to each other for dual polarisation. The design is an array of closely capacitively coupled pairs of fractal octagonal rings. The adjustment of the capacitive load at...
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