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A RF-microwave broadband power amplifier using the Si-Bipolar transistor is presented in this work. The power amplifier operates in several frequency ranges 1.70–2.20GHz. Which covers the following bands: DCS (Digital Cellular System) (1710MHz–1880MHz) in Europe, PCS (Personal communication Services/System) (1850MHz–1990MHZ) in the United States, UMTS (Universal Mobile Telecommunication System) (1920MHz–2170MHz)...
A novel 5.8 GHz RF-DC rectifier has been developed for wireless power transmission applications. It's about a voltage multiplier topology including 5 schottky diodes well known by their low threshold (150 mv) implemented using microstrip lines technology on an FR4 substrate with dielectric permittivity constant 4.4, thickness of 1.6mm and loss tangent of 0.025. The rectifier is loaded by a 160Ω resistive...
The microstrip patch antennas are associated with some disadvantages, such as narrow bandwidth and low gain. To meet the demands of long distance communication, is necessary to design antennas with very high gain. The easiest way of gain enhancement can be obtained is from the array models, but the increasing array spacing, the gain of the antenna gets reduced significantly also decreasing array spacing,...
This paper presents a new design of a low cost passive UHF RFID tag antenna using paper substrate. The design is based on a short dipole loaded at both ends with a pair of triangles and four arms in order to reduce the size of the design. By choosing a proper dimension of the short dipole and the T-matching network, a good and broadband impedance matching can be achieved. The simulation results carried...
In this paper, a novel study on the design and analysis of a compact printed antenna for multi-band applications are presented. The structure of the entire area is 45×45.5 mm2 and is printed on an FR-4 epoxy substrate. It is suitable for GSM/GPS/PCS applications by using an M-shaped antenna which is formed of different arms and an L-shaped shorted strip connected between the feeding line and the ground...
In this paper, a compact diplexer based on coupled stepped impedance resonators (SIRs) is designed for Digital Communication System and the industrial, scientific and medical applications. The diplexer is composed from two band-pass filters operated at 1.8 and 2.45 GHz respectively. The size and the position of the SIR and the feed lines are determined through the theoretical design and the simulation...
This paper comes with a new study on the conception of a CPW-Fed multi bands planar antenna. The design takes into account that this structure can be integrated with circuits behind, that why the Fed is a CPW one. The antenna validated is suitable for GSM, DCS and ISM band. The entire area of the antenna is 36×72.5 mm2 and it is printed on an FR4 substrate. The printed U-shaped antenna is formed from...
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