The metamaterial elements and structures have been noticed for obtaining circular polarization (CP) while developing various procedures. In this paper, we have mentioned some of these cases and compared the metamaterial loads effect on antenna current distribution. We have classified them into four categories. The first case covers patch antenna based on composite right/left‐handed method, where the metamaterial has been used for changing the current distribution in the loop form. The second case has been achieved by radome and metasurface. In the third model, the interaction between feed and metamaterial load has been considered and the last case has been made by the metamaterial load with truncated structure. The metamaterial loading has been modeled based on Nicolson‐Ross or transmission/reflection techniques for extracting the permittivity and permeability. While the microstrip slot antennas are attractive for wider bandwidth, the truncated structure can change the current for achieving CP. Here, we have studied the antenna for wireless and WiMAX applications.
A compact multi-band multi-input multi-output (MIMO) antenna with high isolation is proposed for C and X bands applications. The antenna consists of two trapezoidal-shaped patches printed on FR-4 substrate with a thickness of 1.6 mm and compact size of 17 × 42 mm 2. Defected ground structure (DGS) is wisely embedded in antenna body to reduce the mutual coupling between the antenna elements. This modification suitably enhances the isolation by 30 dB in C-band extended from 6.6 GHz to 7.6 GHz and by 17 dB in X-band between 8.3 GHz to 10 GHz. Moreover, five meander line rectangular patches are properly included to further improve the mutual coupling and eliminate the antenna size increment, simultaneously. The aforementioned meander lines also improve impedance bandwidth of the antenna as well as impedance matching over the entire frequency band. Close agreement of simulated and measured results confirms the antenna outperformance. Design, simulation, and performance analysis of the proposed antenna is discussed in detail.
A small multiband antenna with circularly polarization is presented in order to apply in WWAN/WIMAX/WLAN bands. This antenna consists of a rectangular patch with 2 L-Shaped stubs and 3 slots over a ground which are separated by a substrate. Moreover, the dimensions of the proposed antenna are 21 3 213 0.8 mm 3 . As a result, the simple design enables the antenna to operate in such frequencies of 1.9, 2.4, 3.5, 5.2, and 7.6 GHz which are across the WWAN/WIMAX\WLAN bands. Furthermore, 3 dB axial ratio bandwidth is 16.5% within the WWAN band. The simulation and measurement results of the antenna illustrate a good impedance bandwidth and radiation characteristics cover the whole required band for WWAN/WIMAX/WLAN application. K E Y W O R D S multiband antenna, circularly polarization, small size, Wireless communication system, mobile communication system
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.