In this article, a multiband fractal antenna loaded with parasitic elements for gain enhancement is reported. The proposed radiator has a nested hexagonal loop with an opening at the top. The three hexagonal open loops with a small hexagonal radiator at the center, is fed with a microstrip line. The proposed design composed of parasitic elements to enhance the gain of the antenna. By loading two parasitic elements in the opening of the antenna, gain performance improved by 2 dB at each resonant frequency which are 2.07, 3.73, and 4.96 GHz. The proposed antenna is covering an impedance matching less than −10 dB in the frequency bands of (1.96-2.22) GHz, (3.51-3.91) GHz, and (4.78-5.26) GHz which are supported for LTE, 5G and WLAN applications. An omnidirectional radiation pattern in both E-plane and H-plane at all three resonant frequencies is observed. The overall size of the fabricated antenna has a dimension of 37 mm × 28 mm × 1.6 mm, which is fabricated on FR-4 laminate. A very high correlation is observed between the simulated and measured characteristics.
This document presents a dual band dual polarized coplanar waveguide (CPW) antenna with single port feed. Lower resonating band is circular polarized, while the upper band is linear polarized. A novel concept of realizing dual polarization by suppressing the undesired modes is introduced in this work. Orthogonal Even/Odd modes are excited at lower band and a phase difference of 90° is maintained between them. Hence, circular polarization behavior is realized for lower operating band. For upper band, Odd mode is suppressed by introducing step shaped modifications in the ground plane at left side of the feed line, resulting in linear polarized upper band. Dual band nature of the antenna is confirmed by 10 dB impedance bandwidth extending from 3.91‐5.31 GHz to 7.51‐8.72 GHz. Circular polarized nature of lower band is confirmed by enclosure of lower band by 3 dB axial ratio bandwidth extending from 4.01 to 5.59 GHz. Advantages of proposed antenna involves the use of single port feed for generating dual polarization performance along with compact antenna size.(30 × 30 × 1.6 mm3).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.