Skip to content


  • Research Article
  • Open Access

Flexible Frequency Discrimination Subsystems for Reconfigurable Radio Front Ends

  • 1Email author,
  • 1,
  • 1,
  • 1 and
  • 1
EURASIP Journal on Wireless Communications and Networking20052005:372196

  • Received: 8 October 2004
  • Published:


The required flexibility of the software-defined radio front end may currently be met with better overall performance by employing tunable narrowband circuits rather than pursuing a truly wideband approach. A key component of narrowband transceivers is appropriate filtering to reduce spurious spectral content in the transmitter and limit out-of-band interference in the receiver. In this paper, recent advances in flexible, frequency-selective, circuit components applicable to reconfigurable SDR front ends are reviewed. The paper contains discussion regarding the filtering requirements in the SDR context and the use of intelligent, adaptive control to provide environment-aware frequency discrimination. Wide tuning-range frequency-selective circuit elements are surveyed including bandpass and bandstop filters and narrowband tunable antennas. The suitability of these elements to the mobile wireless SDR environment is discussed.


  • software-defined radio
  • tunable antenna
  • reconfigurable front end
  • MEMS
  • tunable bandpass filter
  • tunable bandstop filter

Authors’ Affiliations

Centre for Communications Research, University of Bristol, Bristol, BS8 1UB, UK


© Bruce E. Carey-Smith et al. 2005

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.