In recent years, the application of radio frequency identification (RFID) operating in the ultra-high frequency (UHF) band (860-960MHz) are expanding exponentially, due to the advantages such as long reading distance, high data transfer rate, and small tag size. So the design of a CP tag antenna with broadband characteristic is presently one of the most challenging topics. This project presents...

The broadband microstrip antenna is realized by fabricating the slot cut patch on lower dielectric constant thicker substrate in conjunction with the proximity feeding technique. In this paper, broadband proximity fed pair of rectangular slot cut microstrip antenna in 1000 MHz frequency band is proposed. The analysis to study the effects of slot on the broadband response is presented. The pair ...

Genetic Algorithm combined with Finite Element software is applied to design a single-patch broadband microstrip patch antenna in this paper. The optimization procedure is also included. The broad-band character is realized by taking out some parts of the ordinary patch antenna. The reliability and efficiency of this method are proved by comparing the antenna proposed in this paper to un-optimi...

This paper describes “Variable 0 Z ,” a novel and proprietary approach to antenna design and optimization. The new methodology is illustrated by applying it to the design of a resistively-loaded bowtie antenna and two broadband Yagi-Uda arrays. Variable 0 Z is applicable to any antenna design or optimization methodology. Using it will result in generally better antenna designs across any usersp...

A broadband circularly polarized (CP) slot antenna array fed by an asymmetric coplanar waveguide (CPW) with stepped and inverted T-shaped strips is proposed. Using four square slot antenna elements with sequential rotation oblique feed and a modified sequential-phase (SP) feeding network, broadband CP can be achieved. The measured −10 dB reflection coefficient bandwidth and 3 dB axial ratio (AR...

A broadband zeroth-order resonant (ZOR) antenna based on asymmetric coplanar waveguide (ACPW) is presented. By adopting the epsilon negative transmission line (ENG-TL), a zeroth-order resonance mode can be achieved. We employ an asymmetric coplanar waveguide structure which offers the design freedom to realize the broadband ZOR antenna, where the antenna’s bandwidth is characterized by the equi...

In this paper, we investigate and compare two different antenna types for UHF SATCOM applications; proposed Moxon type (bent dipole) and conventional egg beater (loop) antennas in terms of antenna performance and physical size. Bent dipole and egg beater antennas are simulated using HFSS software. Prototype antenna for Moxon type is also fabricated and measured for its return loss using Agilent...

Microstrip antenna is gathering a lot of interest in communication systems. Genetic algorithm is a popular optimization technique and has been introduced for design optimization of proximity coupled antenna. Patch length, patch width are taken as optimization parameters. Return loss and radiation pattern for the optimized antenna are verified using IE3D software. Accuracy of the results encoura...

The Active Loop Antenna Model ALA100HG is a large aperture antenna designed to provide improved performance compared to traditional active and passive antennas. The ALA100HG has two modes of operation; at Medium and Low Frequencies the antenna is a high efficiency broadband Loop; for High frequencies the antenna has a response similar to a Longwire. The ALA100HG is primarily designed to reduce ...