Modern era of wireless communication relies on the evolution of adaptive antennas. This
influences the new age antenna designs to adapt themselves to the changing RF …

This paper discusses the fundamental principles of a cognitive-radio RF system. The key
points required to achieve a true cognitive-radio device are outlined. The operation of a …

Reconfigurable antennas, with the ability to radiate more than one pattern at different
frequencies and polarizations, are necessary in modern telecommunication systems. The …

A cognitive radio front end using an optically pumped reconfigurable antenna system
(OPRAS) is investigated. The scheme consists of a ultrawideband antenna and a …

In this paper cognitive radio is described, discussed and compared with software defined
radio (SDR). The two types of cognitive radio are presented and examples on both spectrum …

This paper presents the design of a compact ultra-wideband (UWB) antenna and a
frequency reconfigurable antenna with high isolation for cognitive radio (CR) applications …

In this paper, a cognitive radio (CR) based multiple-input-multiple-output (MIMO) antenna
element comprising of an ultra-wideband (UWB) and narrowband (NB) radiator is proposed …

A novel frequency reconfigurable substrate integrated waveguide-interdigital capacitor (SIW-
IDC) antenna is presented. The antenna is designed based on a composite right/left-handed …

In this study, novel compact filtennas with large tunable frequency band are proposed for
cognitive radio (CR) applications. Tunability is achieved by integrating a tunable T‐shaped …

The paper proffers the procedure to model a PIN diode RF switch using full-wave EM solver,
HFSS and utilizes the switch to built a simple partial ground plane antenna with …