A new design concept of a multi‐configuration antenna providing both frequency notched ultra‐wideband and multiple narrowband functionality from a coplanar waveguide fed circular monopole antenna is presented in this study. The proposed multiple antenna configurations are achieved by loading the feed section of the antenna with circular split ring resonator pair of varying dimensions and inner ring orientations and shorting copper strips. Fabricated prototypes were measured and compared with simulation and good agreement is obtained for both impedance and radiation characteristics.

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An active reconfigurable ultra-wideband antenna exhibiting complementary frequency notched and narrowband responses is proposed in this paper. The frequency responses are achieved on a CPW fed single element printed monopole antenna loaded with a pair of split ring resonators (SRR) and PIN Diodes. The SRRs and PIN Diodes embedded on the Coplanar Waveguide (CPW) feed works as an inline filter, when activated, exhibits frequency reconfigurability by transforming a frequency notched wideband antenna into a narrowband antenna. Different biasing conditions (reverse and forward) on the loaded PIN diodes toggle between frequency-notched and narrow band response of the antenna. Prototypes are fabricated and the measured impedance and radiation characteristics are presented. This concept offers multi-antenna functionality using a single radiator without any modification or addition to the radiator geometry.

This study investigates the effect of loading a monopole‐fed cylindrical ring dielectric resonator antenna using a metallic cap and metallic sleeve on its top and outer surface, respectively. The proposed design exhibits a considerable shift of its upper cut‐off frequency (from 13.8 to 20.5 GHz for top loading and 8.2 to 15.9 GHz for outer‐surface loading) with varying inner radii (height) of the metallic cap (sleeve), thereby providing the bandwidth (BW) controllability. Fabricated prototypes were measured and compared with simulations and good agreement was obtained. The measured return loss exhibits the desired BW control without affecting the peak gain and radiation pattern of the antenna, which is also confirmed by the measured radiation patterns. The proposed concept can be used to reconfigure the BW of the antenna according to the user's requirements and improve signal‐to‐noise ratio by rejecting unwanted frequency bands without employing any additional filter section.

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The authors present the design and realisation of balanced antipodal tapered slot antenna (BATSA) with frequency notched ultra‐wideband impedance characteristics, very high gain and extremely low cross‐polarised radiation. The proposed antenna comprises a central elliptic conductor sandwiched between two elliptic conductors etched on two dielectric substrates both of which acts as the ground planes and thereby provide an electromagnetic balance for the radiating electric field. The proposed BATSA is fed by a microstrip line. The microstrip section is followed by the radiating flared section of the antenna. The notch frequency is achieved by introducing a quarter wavelength spur line in the feeding microstrip line of the antenna. The fabricated prototype of the antenna was characterised for impedance and radiation performance revealing a very good correspondence with simulation results. Radiation pattern characterisation confirms high gain in the end‐fire direction and very low cross‐polarisation compared to antipodal tapered slot antenna.

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A new design of exponentially tapered slot UWB antenna with frequency notch characteristics is proposed in this letter. The microstrip line feed of the antenna is loaded with a pair of SRRs which controls the notch frequencies. For proof of concept and versatility, two different SRR geometries, square SRR (S‐SRR) and hexagonal SRR (H‐SRR), are used to obtain the frequency notches. Fabricated prototypes are measured and their impedance and radiation characteristics are validated with the simulation results. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1241–1245, 2017