Showing papers on "Front-to-back ratio published in 2001"
TL;DR: In this paper, a dual-polarized microstrip antenna capable of achieving a wide bandwidth, high isolation, low crosspolarisation levels and low backward radiation levels is presented.
Abstract: A dual-polarised microstrip antenna capable of achieving a wide bandwidth, a high isolation, low cross-polarisation levels and low backward radiation levels is presented The H-shaped coupling aperture is used For wide bandwidth and easy integration with active circuits, it uses the aperture-coupled stacked microstrip square patches Measured return loss exhibits a bandwidth of over 209% and isolation is better than 36 dB over the bandwidth Cross-polarisation levels and the front-to-back ratio are better than –22 and 21 dB, respectively
29 citations
03 Dec 2001
TL;DR: In this article, two singly-fed circularly polarised microstrip radiating elements that use multilayer substrates were designed to operate in S-band with a center frequency of 2.45 GHz and measured impedance bandwidths (VSWR/spl les/2) are 23% and 14% while the computed 3dB axial-ratio bandwidths are 7% and 2% respectively.
Abstract: This paper presents two novel types of singly-fed circularly polarised microstrip radiating elements that use multilayer substrates. The antenna elements are designed to operate in S-band with a centre frequency of 2.45 GHz. The measured impedance bandwidths (VSWR/spl les/2) are 23% and 14% while the computed 3-dB axial-ratio bandwidths are 7% and 2% respectively. Important radiation characteristics such as gain bandwidth, cross polarisation and front-to-back ratio of these elements have also been examined and compared.
1 citations
TL;DR: In this article, the effect of radius of dipoles on the directivity, front to back ratio, and VSWR has been investigated, and the optimum design has been proposed.
Abstract: The Log Periodic Dipole Array (LPDA) antenna is extensively used for applications, which require broad bandwidth with moderate gain The analysis of LPDA using Method of Moments (MOM) has been carried out by modeling the array of dipoles and the feeder network separately The effect of radius of dipoles on the directivity, front to back ratio, and VSWR has been investigated, and optimum design has been proposed The performance has been improved by additing extra elements on either side of the array