A two port UWB‐dual narrowband antenna for cognitive radios

A two port ultra wideband(UWB) and dual narrowband antenna for cognitive radio(CR) applications is reported. In this letter an elliptical patch is used as an UWB sensing antenna which is coplanar waveguide (CPW)-fed transmission line with elliptically tapered ground plane. A rectangular slot is etched from the radiating patch to integrate the narrow band communication antenna where basically the surface current density is effectively low. Within the slot a triangular monopole with meander line LC (inductance–capacitance) resonator in the feed helps to realize dual narrowband (NB) communication antenna. This proposed antenna is a potential candidate for cognitive radio application where the elliptical patch antenna covers the UWB frequency range (3.1–10.6 GHz) with stable radiation patterns for spectrum sensing and the triangular monopole with meander lines LC resonator in the feed behaves as dual band communication antenna with first band operating at WLAN 5.04 GHz (4.48–5.4 GHz) and second band operating at X band satellite communication at 7.6 GHz (7.4–7.76 GHz) with isolation less than −10 dB in the whole operating band between the two antenna ports. The prototype of the proposed antenna has been fabricated and its S-parameters in terms of S11, S22, S21 as well as radiation patterns were measured that shows good agreement with simulated results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1973–1978, 2016