Low-Return-Loss Printed Log-Periodic Dipole Antenna

Abstract

International audienceIn this letter, a low-return-loss printed log-periodic dipole antenna (PLPDA) fed by a coaxial cable is presented. The widths of dipole elements are optimized to increase the bandwidth. A study of coaxial cable position is included in order to improve the antenna behavior. The measured return loss is lower than -15 dB from 2.1 to 4.3 GHz. The measured gain varies between 6 and 7 dBi. The measurements, including input impedance, gain and radiation patterns, and simulations are in agreement

An optimal design of printed log-periodic antenna for L-band EMC applications

“…The PLPDA is designed by printing on both the sides of dielectric substrate. In order to achieve a phase reversal between two consecutive dipoles in a PLPDA, every consecutive dipole needs to be printed on opposite sides of the dielectric PCB substrate [10]. The feeding system used in the antenna has a significant impact on the input impedance of the PLPDA.…”

“…A unique design of a two-layered PLPDA with feeding through stripline conductor has been proposed by Campbell et al in [11]. Another way of feeding the antenna through coaxial cable is demonstrated in [10], where both the conducting booms of the PLPDA are connected together simply by drilling a hole into the substrate and connecting it using a conducting wire. This approach enables the antenna to act as its own balun and to achieve wide bandwidth characteristics.…”

Subsectional Tapered Fed Printed LPDA Antenna With a Feeding Point Patch

“…In regard to antenna feeding, two very well-known structures, coaxial cable and standard microstrip lines with constant widths including the coplanar one, are used. In fact coaxial feeding is not very suitable for printed structures since it requires additional realization efforts and deforms the planar form [3], [7]- [9]. It is also seen that the standard microstrip feedings do not improve the bandwidth when compared with the coaxial one [5], [8].…”

“…Moreover, patches or short tapers at the input that are between the feed point and the array might be used as impedance transitions. However, they do not make significant contributions in terms of bandwidth ratio [2], [3], [8], [13], [14]. In [14], the antenna with the dimensions of a standard PLPDA, consisting of 12 elements and a short taper transition at the input, only covers the frequency range between 1536-1225 © 2015 IEEE.…”

Construction and Characterization of Dipole Antenna to be Used in SAR Measurements

“…Dipol antene verilen işaretin gerçekten ne kadarının ortama aktarıldığını gösteren önemli parametrelerden bir tanesi yansıma kaybıdır. Bir dipol antenin yansıma kaybı ne kadar büyük ise ortama aktardığı işaret o kadar fazladır [8]. Uluslararası standartlara uygun bir SAR doğrulama ölçümü gerçekleştirebilmek için dipol antenin sahip olması gereken en küçük yansıma kaybı 20 dB olmalıdır [1], [2].…”