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This paper presents a design approach for a broadband and high efficiency harmonic-tuned power amplifier (PA) based on a low-pass filtering (LPF) matching network (MN). The MN is composed of quasi-lumped open stubs (λg/8<l< λg/4). Compared with widely used conventional Chebyshev LPF matching networks, the proposed output matching network provides a good approximation of desired lumped elements...
A novel approach to design a miniaturized frequency selective surface (FSS) is proposed. The miniaturization is achieved by enhancing the inductance of the proposed stepped-impedance array element. This enhancement is done by using a micro-wire and controlling the path of the current which passes through the metallic surface of the element. As a result, the dimensions of the miniaturized element are...
This paper presents a novel compact dual-band printed quadrifilar helix antenna (PQHA) for application in Compass Navigation Satellite System (CNSS) of China. This antenna is consisted of two quadrifilar helix elements that are arranged at inner and outer cylinder. It works at the B1 (1.561GHz) and S (2.492GHz) bands. Each four spiral arms is excited by a series feed network in equal magnitude and...
The planar inverted-F antenna (PIFA) is widely used in mobile and portable radio systems due to its excellent features. However, it is not yet employed as an ultra wide band antenna because it was considered a narrowband antenna. This paper introduces an ultra wideband planar inverted-F antenna based on three techniques, which are (a) changes in the widths of feed and shorting plates, (b) addition...
The ultra wide band (UWB) systems require antennas having a very broad impedance bandwidth. The planar inverted-F antenna (PIFA) is widely used in mobile and portable devices due to its excellent performance. But it is not used as an ultra wide band antenna as it is assumed to be a narrow band antenna. This paper is aimed at addressing this problem by introducing a PIFA antenna having a parasitic...
This paper represents a simulated and experimental study of the planar inverted-F antenna (PIFA). It involves the changes in different parameters to observe their effects on the antenna characteristics such as the resonant frequency, impedance bandwidth and radiation pattern. It is found that the characteristics are affected by a number of parameters which include dimensions of ground plane, length,...
We demonstrate two high-performance photonic-transmitters based on uni-traveling-carrier-photodiode (UTC-PD) and separated-transport-recombination-photodiode (STR-PD). Thanks to recombination center, STR-PD exhibits comparable maximum-peak-power and electrical pulse-width with much smaller photocurrents and less serious device-heating to those of UTC-PD.
This paper represents a simulated and experimental study of the planar inverted-F antenna (PIFA) involving the changes in the widths of shorting and feeding plates and feeding position under the radiating top plate to observe their effects on the characteristics of PIFA, which includes such as the resonant frequency, impedance bandwidth and radiation pattern. It is found that feeding plate width plays...
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