A Novel U-Shaped Tri-Band Antenna on High Permittivity Multilayer Substrate for Wireless Communications

In this paper, a detailed study of a new proposed rectangular dielectric u-shaped tri-band antenna is presented. A meticulous study considering the high permittivity material effect is introduced and discussed. All the design procedures are performed by using CST MS software. Moreover, the modified shaped patch antenna by introducing a slot on the rectangular radiated patch, offers improved bandwidth and allows an important miniaturization in size. Note that the proposed antenna can be used for several wireless technologies, especially for the GSM, Bluetooth, Wi-Fi, WLAN, WiMAX, all bands GPS frequencies, ISM band and ultra wide band applications. Detailed design steps, parametric studies and the simulation results for the proposed antenna are investigated under specific scenarios. Finally some concluding remarks will be drawn

Study and Design of a Compact Parallel Coupled Microstrip Band-Pass Filter for a 5 GHz Unlicensed Mobile WiMAX Networks

In this paper, a compact parallel coupled microstrip band-pass filter (BPF) is used to design a wideband third order of the Tschebyshev elements for an unlicensed WiMAX technology. Some techniques based on the parametrical study are proposed to obtain the desired 10 % operating bandwidth filter response. The new filter is implemented on Arlon AR 1000 substrate having a relative permittivity of 10 and substrate thickness 1.1938 mm respectively. The results based on the transmission line theory approach and the commercial electromagnetic Agilent ADS and CST-MS simulators show a good agreement

Design and Characterization of a Compact Single Layer Modified S-Shaped Tag Antenna for UHF-RFID Applications

In this paper, we report the design of a new compact single layer modified S-shaped tag antenna for UHF-RFID applications. To achieve a compact size of 51×34 mm2 for this tag antenna, the technique of using S shaped strip is applied, and by further adding a pair of equilateral triangular stubs into this structure, good impedance matching can be obtained at 915 MHz, which is the center frequency of the North-American UHF-RFID band (902 to 928 MHz). Besides exhibiting acceptable 5m read range in free space at 915 MHz, the proposed design shows a read range of about 4.5 when mounted on a metallic object (200 ×30 cm2) separated by spacer foam of thickness 1 cm. Furthermore, the proposed design shows a reasonable read ranges when it is mounted on different dielectrics with low permittivity. The proposed design has a simple configuration, low cost, acceptable read range, and can work on various background materials. &nbsp

Study, Modeling and Characterization of Dual- Band LNA Amplifiers Receivers Radio- Communication

The current design is especially suitable for use in multi-standard wireless receiver, in recent years; there has been a growing market for dual band transceivers for various wireless standards. IT is therefore the study of modeling and characterization of a dual LNA in radio communications receivers for their improvements. The LNA with constant bias circuit allows very interesting performance of the process. Dual-band Low Noise Amplifier (LNA) operates in the 3.9 GHz and 4.48 GHz frequency bands. RF circuit designs take two parallel LNAs with a single transistor ATF10136, and bandpass filter (BPF) networks are usually used match both the input and output ports at two different bands, are matched to 50Ω without external elements. A conventional source degeneration inductor is eliminated for higher signal gain while providing reasonable input impedance. The LNA using a constant-gm bias circuit achieves competitive and robust performances over process, voltage and temperature variation. Simulation results indicate a Noise Figure below 1.5dB and S21 above 11 dB in all frequency bands and also input and output return loss are below -11 dB for all desired frequency band while drawing 2.5mA current from a 5V power supply

Design of High Gain Novel Dielectric Resonator Antenna Array for 24 GHz Short Range Radar Systems

in this work we present a 16x1 array’ elements of a high gain Novel shape designed Dielectric Resonator Antenna (NDRA), having a low dielectric constant value of 18, for wide band (WB) and narow band (NB) 24 GHz automotive Short Range Radar (SRR) applications. The proposed NDRA array is feed by an efficient microstrip network feeding mechanism and presents wide impedance bandwidth (426 MHz), high gain (20.9 dBi), high efficiency (96%) and directional radiation pattern at 24 GHz with narrow angular beam-width of 6.4°. Computed NDRA array results allow the proposed design to be practical for the next automotive radar generations. Parametric studies have been analyzed using the Finite Difference Time Domain (FDTD) method of the CST-MW time domain solver and results, of the optimal structure, have been validated by the Finite Element Method (FEM) used in HFSS electromagnetic (EM) simulator

Efficient modeling of chiral media using SCN-TLM method

An efficient approach allowing to include linear bi-isotropic chiral materials in time-domain transmission line matrix (TLM) calculations by employing recursive evaluation of the convolution of the electric and magnetic fields and susceptibility functions is presented. The new technique consists to add both voltage and current sources in supplementary stubs of the symmetrical condensed node (SCN) of the TLM method. In this article, the details and the complete description of this approach are given. A comparison of the obtained numerical results with those of the literature reflects its validity and efficiency

Global modeling of microwave three terminal active devices using the FDTD method

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Uniaxial bi-anisotropic dielectric ring resonators analysis using the mode matching method

In this paper, dielectric bi-anisotropic effects on the resonant frequencies of dielectric ring resonators (DRR) are studied in depth. The resulting electromagnetic boundary problem is solved numerically using the mode matching method (MM). In order to validate this numerical model, the obtained results are compared with those of the literature for a uniaxial electric anisotropic dielectric ring resonator