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The design of more than one antenna system called antenna arrays. Patch antenna arrays are used extensively due to their high directivity and gain, also light weight and low cost. In antenna arrays energy is wasted in backward radiation as well as losses due to mutual coupling. Placing of elements close to each other can minimize the overall size of an array. On the other hand, a major drawback of...
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 new broadband microwave microstrip power limiter is designed and validated into simulation by using ADS (Advanced Design System) from Agilent technologies. The Power Limiter is based on microstrip technology and Zero Bias commercial Schottky diodes HSMS286x associated as a bridge rectifier. The circuit is validated in two steps. The first and basic circuit is formed from one bridge...
This work presents the miniaturization of a single rectangular microstrip antenna at 2.45 GHz in the ISM “Industrial Scientific and Medical” band by using the slots technique. This microstrip antenna has a CPW fed and designed for RFID reader system on FR4 substrate with dielectric constant of 4.4, and simulated performing CST Microwave Studio. The total area of the final circuit is 19 × 31 mm2. The...
This paper presents a new dual-band microstrip slot antenna using two inverted L-shaped slots embedded on the radiating patch, suitable for Radio Frequency Identification (RFID) applications especially designed for RFID readers and it operates at 910 MHz and 2.45 GHz. This antenna is designed with a reasonable gain, low profile and low cost achievement. The simulation results carried out by ADS and...
This work presents the miniaturization of a single rectangular microstrip antenna at 2.45 GHz in the ISM “Industrial Scientific and Medical” band by using the fractal technique. This microstrip antenna has A CPW fed and designed for RFID reader system on FR4 substrate with dielectric constant of 4.4, and simulated performing CST Microwave Studio. The total area of the final circuit is 21.22 × 32.05...
This paper presents a new multiband planar antenna array based on fractal geometry. This structure is validated in ISM band at 2.4 GHz and 5.8 GHz which makes it suitable for wireless power transmission applications. The return loss at the validated bands is around −18 dB. The radiation pattern shows wide aperture angles characteristics of 75° with a gain of 8 dBi at both bands. The antenna is designed...
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...
Interest for Wireless Power Transmission systems (WPTs) is increasing since they allow for power supplied devices involving low power consumption, located in unreachable area or needing expensive maintenance costs. In this paper we will present a rectenna design which is modeled and evaluated for an WPTs at 2.45GHz. The proposed rectenna structure consists of a 3×3 receiving antenna array with circular...
In this paper we have developed and designed a low cost fractal Multi band microstrip antenna structure. This antenna is validated in the ISM (Industrial Scientific and Medical) band at 2.45 GHz and 5.8 GHz. The aim of this work is to develop an antenna which can be associated with an RF-DC rectifier to design a rectenna system for wireless power transmission “WPT”. The technique used to have a multiband...
Wireless power transmission (WPT) is a promising technology to remotely energizing low power electronic devices in wireless communication circuits. In this paper we present an efficient rectenna (rectifier+antenna) design which is the crucial part in a microwave power transmission system. The developed design contains a new 3×3 antenna array having an operating frequency of 2.45 GHz with circular...
In This paper, the design and analysis of a new compact printed antenna for UWB applications are presented. This antenna consists of a pentagon patch with Y-shaped slot and a partial ground plane with a periodic rectangular slot. The effect of various parameters on UWB characteristics has been analyzed by using 3D electromagnetic Simulator CST Microwave Studio and Momentum Software integrated into...
This paper presents the study of two decoder architectures and their VHDL design and implementation on a FPGA circuit. Both decoders are designed for Difference Set Cyclic (DSC) codes. The first one is the Hard In - Hard Out decoder (HIHO), and the second one is the Massey's threshold Soft In - Hard Out (SIHO) decoder. The two architectures are analyzed and discussed for serial and parallel processing...
Breast cancer affects many women. Early detection and timely medical intervention is the key to long term survival and life quality for patients. The algorithm proposed in this paper contains four steps: Image DATA, preprocessing, features extraction and classification. Images samples are acquired with X-ray or new technique Terahertz imaging, noise removal is performed in preprocessing, statistical...
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...
This paper presents the design, simulation, and implementation of band pass filters in rectangular waveguides with radius, having 0.1dB pass band ripple and 6.3% ripple at the center frequency of 14.2 GHz. A Mician microwave wizard software based on the Mode Matching Method (MMM) was used to simulate the structure of the filter. Simulation results are in good agreement with the measured one which...
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