In this study, a Koch snowflake frequency reconfigurable antenna for wideband applications is presented including experimental verification. The frequency reconfigurable approach is obtained for UHF band using RF PIN diodes, lumped capacitor and inductors. Proposed antenna is compact, therefore, it can be used as an array element. It has three measured frequency bands. These bands are: case I, 3.34– 4.52 GHz (30%); case II, 2.2–3.4 GHz (43%); and case III, 1.45–4.1 GHz (95.49%). In cases I and II, two different bands are obtained and case III covers almost the frequency band of case I and case II. Thus, the impedance bandwidth of the proposed antenna provides continuous wideband frequency coverage from 1.45 to 4.52 GHz (103%). In addition, the measurements are carried out to validate the performance of the antenna. The proposed antenna has good agreement between simulated and measured results with reasonably low cross polarisation.
A microstrip line feed modified Sierpinski square fractal antenna for ultra-wide band (UWB) with band notch characteristics is presented. UWB operation (3.1-10.6 GHz) is achieved by increasing the numbers of iteration and rectangular grooved ground plane. The band rejection characteristic is realised by a ∩ -slot in the feed line. The proposed antenna has a volume 34 × 34 × 1.6 mm 3 with a square shape structure and shows omnidirectional radiation patterns. The measurement results indicate that the antenna offers UWB operation and a notch at 5.5 GHz (5-6 GHz) for a reflection coefficient below −10 dB which covers the wireless local area network band. Acceptable agreement is obtained between the simulated and measured antenna performance parameters. These characteristics demonstrate that the proposed antenna is an attractive candidate for UWB applications.
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.