A coplanar waveguide (CPW) fed ultra-wideband antenna is proposed for UWB applications. The proposed antenna consists of circular monopole with single complementary split ring resonator (CSRR) slot and reduced ground plane. The overall size of an antenna is 20 3 25 3 1.6 mm 3 . The prototype antenna is designed, fabricated and tested. It provides good return loss characteristics and radiation pattern. The measured 210 dB impedance bandwidths are 1.06 GHz (3.9-4.96 GHz) and 4.5 GHz (6.7-11.2 GHz) with resonance frequencies at 4.4 and 9 GHz, respectively. An appropriate dimension of CSRR slot has been etched on patch to notch 5-6 GHz band to avoid interference with WLAN and WiMAX devices which is one of the crucial issues to be solved in UWB antenna. Parametric studies on width of ground plane and dimension of CSRR slot are done to investigate the effect of various geometrical values on antenna characteristics. The simulated and measured results of the antenna are in close agreement with each other which will confirm the applicability of the proposed antenna.

A parasitic fed ultra‐wideband antenna is proposed for WLAN and UWB applications. The proposed antenna consists of parasitic hexagonal patch surrounded by hexagonal slot and ground plane in same side of the substrate. Microstrip line present on the other side of the substrate excites the patch parasitically. The overall size of an antenna is 25 × 25 × 1.6 mm3. The prototype antenna is designed, fabricated and tested. It provides good return loss characteristics and radiation pattern. The measured −10 dB impedance bandwidth are 2.12 GHz (3.71 GHz to 5.83 GHz) and 6.1 GHz (6.05 GHz to 12.15 GHz) with resonance frequencies at 5.25 GHz and 6.73 GHz respectively. Since, this antenna provides good resonance at 5.25 GHz having impedance bandwidth more than 1 GHz, this can be used for WLAN applications. This antenna also provides notch band from 5.83 GHz to 6.05 GHz where vehicular ad hoc network (VANET) devices operate. Hence, this antenna does not cause interference to VANET devices. Parametric studies on patch, slot dimension, feed length are done to validate the results. The simulated and measured results of the antenna are in close agreement with each another. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2996–3000, 2016

This letter presents metamaterial (MTM) based dual band antenna. Two resonances are obtained by making use of square ELC (Electric‐inductive‐capacitive) resonator and CR (Closed Ring) resonator. This research evolves an antenna having dimension only of 21 × 30 × 1.6 mm3 which operates at two bands from 3.28 GHz to 4.52 GHz and from 5.20 GHz to 5.87 GHz. This antenna can be useful for WiMAX and WLAN transceiver at 3.5 GHz and 5 GHz band respectively. It can also be used in RFID applications at 3.9 GHz band. This paper includes the parametric investigations as well as measurement details. Simulation and measurement data have shown good equivalence which emphasis the practicability of the proposed antenna. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:304–307, 2017

This research article presents a novel design of printed antenna for 24 GHz ultra‐wideband (UWB) applications. This research develops an antenna having dimension of 5 × 6 × 0.8 mm3 which operates from 24 to 30 GHz. This is achieved using techniques such as truncation of patch edges and inclusion of complementary split ring resonator metamaterial (MTM). This antenna can be used for short range RADAR application at 24 GHz UWB for automotive appliances. This article includes the detailed investigations such as surface current distribution on antenna, far field patterns, gain, group delay and radiation efficiency over frequency, as well as measurement details. Simulation and measurement data on return loss have shown good equality which proves the feasibility of the proposed antenna.

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