The microstrip patch is one of the most preferred antenna structures for ofordable and compact design for wireless system and RF applications. This paper compares the rectangular patch antenna and equilateral triangular microstrip antenna in terms of their return losses and radiation pattern. For the comparative study the Ansoft HFSS V11 is used. Keywords— rectangular micro strip antenna, retur...

This paper describes the cross-talk analysis of high-speed PCB design. Some models using multiple PCB traces above a ground plane having guard traces and vias are taken and the results are obtained from modeling and simulation using Ansoft HFSS software tool and are compared with the experimental results. Reduction techniques of crosstalk are highlighted.

In this work, two electromagnetic models are used for the characterization of a planar structure including a flat, thick copper conductor. Indeed the first model is consisted by modeling two metal ribbons without bulkiness, placed one above the other at a distance of h2 equal to the thickness of the thick conductor. This approach has been implemented and tested by the iterative method. The resu...

In microstrip patch antenna array, the mutual coupling is very critical due to surface wave excitation. It leads to degradation in radiation pattern and reduction in gain. In this paper, a method to mitigate mutual coupling effect in an antenna array using Slotted Ground Structure (SGS) at 900MHz and dielectric constant 2.2 is simulated and analyzed using Ansoft HFSS 13. Simulated results show ...

BUILDING A NEW MODEL It is possible to incorporate the temperature and bias dependency of power HBTs in a model by using a thermal network to represent the self-heating and thermal coupling. Such an improved multi-finger HBT model was developed and implemented in a nonlinear circuit simulator, Serenade, from Ansoft Corp. When increasing the collector-emitter voltage of a unit finger HBT, an inc...

This paper investigate some methods for converting single band antennas to multiband antennas so that all single band antennas convert in multiband antennas and gives multiband facility without increasing the cost of manufacturing. Simulation is performing on Ansoft HFSS and corresponding result are shown by figures. Impedance bandwidth, VSWR and Return loss are observed for the proposed antenn...

This paper deals with theoretical investigation on a compact frequency selective surface with multiple resonant frequencies. In this paper the FSS is designed by modifying square patch nearly similar as ‘H’ shaped patch and then cutting hexagon shaped slot within it. 94.93% size reduction is achieved in this design. Three resonant frequencies have been obtained in this design. Theoretical inves...

A modified printed Yagi antenna with a simplified feed mechanism is proposed. In the new design, the driver dipole is fed by a transmission line formed by two parallel strips printed on opposite sides of the dielectric substrate. This simplified feed structure results in the reduction of the transmission line length, and, consequently, the radiation losses. The analysis of the modified Yagi ant...