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A new design of a compact ultra‐wide band (UWB) monopole antenna with triple‐band, triple‐sense circular polarisation (CP) is presented here. It is composed of a compact quad‐circular monopole, a fractal parasitic ring resonator, a triangular ring resonator, rectangular ring resonator, and modified ‘T’ and ‘I’ shaped slots on the ground plane along with a rectangular stub with ‘E’‐shaped slot on the right side of the monopole. The proposed antenna radiates left‐hand circularly polarised (LHCP) wave at lower and mid‐frequency bands, while right‐hand circularly polarised (RHCP) wave at upper frequency band. The results show that the antenna covers an ultra‐wide bandwidth from 3.1 to 11 GHz (112%). Moreover, the proposed antenna achieves good CP characteristics at Citizens Broadband Radio Services in USA (3.55–3.72 GHz), artificial magnetic conductors and WLAN upper frequency spectrum (4.81–5.61 GHz), VSAT services & Satellite Communication and Ground Surveillance RADAR (9.29–10.95 GHz), respectively. Novelty of this article lies in designing a compact printed UWB monopole antenna with combined triple band CP characteristics controllable by adjusting the antenna design parameters. The simulated and measured results of the antenna have been compared and seen to be in reasonable agreement.

A new design of a compact dielectric resonator (DR) wideband antenna, catering the ultra‐wideband (UWB) spectrum and beyond, along with dual‐band circular polarization characteristics is presented in this literature. The antenna is realized by placing a pair of orthogonally placed DRs over a planar “I”‐shaped monopole. Fundamental modes of TE10δ (0.25emTE10δx and TE10δyfalse) and TE11δ (0.25emTE11δx and TE11δyfalse) are excited at 3.8 and 6 GHz by incorporating a pair of orthogonally placed DRs that generate the lower and upper band of circular polarization, from 3.7 to 4.4 GHz (17.28%) covering downlink and from 5.8 to 6.2 GHz (11.56%) for uplink C‐band communication satellites. The antenna provides an overall impedance bandwidth of 2.1 to 13 GHz (146.33%), thus covering UWB and lower end of the Ku‐band. Novelty of this work lies in achieving UWB and dual‐band circular polarization characteristics in a single antenna system.

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In this communication, a compact Dielectric Resonator (DR) based multiple-input-multipleoutput (MIMO) antenna is presented for wideband applications. The antenna consists of two modified kite-shaped monopoles where four DRs have been placed on the patch. Corners of four DRs have been etched to implement the orthogonal phase, which leads to circular polarization characteristics. Implementation of DRs also helps in bandwidth enhancement purpose. Two L-shaped parasitic strips along with a Y-shaped stub have been used in the ground plane so as to obtain high isolation, which leads to a decrease of mutual coupling between the antenna elements. The proposed antenna achieves a wide impedance bandwidth of 7.1-22 GHz (106%) along with low mutual coupling of less than −15 dB within the entire frequency range as well as circular polarization characteristics, which covers the frequency range (−3 dB) of 7.1-7.9 GHz (10.6%). Thus the antenna can be considered as a potential candidate for modern wireless communication systems.