Full Wave Transverse Transmission Line Research Articles

Dynamic analysis of superconductor at high temperature for antennas array

The analysis and new results of the resonance frequency and radiation pattern of antennas array, for glass fiber FR-4 substrate using superconductor and copper patch, are presented. The linear superconducting rectangular antennas array uses the new materials SnBaCaCuOy at temperature of 160 K with conductivity equal 1.5 x 10(5) S/m. The concise full wave Transverse Transmission Line (TTL) method is used in the analysis and to obtain some results. The HFSS is also used and new results for the reflection coefficient (S11), return loss as functions of the resonant frequency, and pattern radiation of antennas array, are presented.

Multilayer Antenna with Metamaterial and Arbitrary Substrate

This paper presents a study and development of equations consisting metamate- rials of negative refraction index. The equations developed for this structure are based in full wave Transverse Transmission Line (TTL) method. This method possibility a signiflcant alge- braic simpliflcation of the equations involved in the process. In order to analyze this structure the complex resonant frequency were determined. The results obtained for this application are presented. Microstrip antennas are widely used due to its various advantages such as reducing size, weight, and cost and in addition because it interfaces easily with other microwave circuits, compatibility with integrated hybrid circuits and the possibility of acting with dual frequency (1). They can be used in several systems, such as: radars, wireless, mobile telephony and communication by satellites. This paper presents an application of multilayer antenna with metamaterial. The analysis is made using the concise full wave TTL method. However, most of the designs are still in the stage of theory and there is a big challenge to integrate antennas with dielectric multilayer has advantages, such as, the ∞exibility in the operation frequency band and a smaller physical size. The TTL | Transverse Transmission Line method is used in the determination of the electro- magnetic fleld components in the Fourier transform domain (FTD), for the three regions of the structures shown in the Fig. 1. The moment method is applied and adequate basis functions are used to expand the current densities in the metallic strip.

Microstrip Array with PBG Substrate

The phased array formed by microstrip antennas is analyzed using the full wave Transverse Transmission Line (TTL) method. For the microstrip patch resonator a set of equations that represents the electromagnetic fields in the x and z directions as function of the fields in the y direction are obtained applying the TTL method. The structure PBG (Photonic Band Gap) is analyzed using the homogenization theory, the objective is obtain the equivalent permittivity of structure. Numerical results of the radiation pattern for some phase excitation in a phased array are shown.

Analysis of Antennas with PBG Substrate

The use of photonic materials has been used in the theory of optical waves. The PBG (Photonic Band Gap) theory and material, was developed recently for optical frequencies and can be easily applied to millimeter waves, microwaves and planar antenna frequencies. The presence of photonic materials as substrate in antennas has some good characteristics such as, supression of light spontaneous emission and suppression of surface waves, allowing the application in planar antenna array. In this work an elaborate analysis using the full wave Transverse Transmission Line - TTL method, that provides efficient and concise results is applied to the planar antennas array with PBG substrate.