access icon free Miniaturised wideband filtering antenna by employing CRLH-TL and simplified feeding structure

A miniaturised three-order wideband filtering antenna by employing a composite right/left handed transmission line (CRLH-TL) and a simplified asymmetric coplanar strip feeding structure is presented. The CRLH-TL resonator resonates at zeroth-order mode and first-positive-order mode, and the meander-line antenna performs not only as a radiator but also as the last resonator of the corresponding bandpass filter. The proposed filtering antenna has four poles in the passband and two radiation nulls at the band edges. Compared with conventional antennas, the proposed filtering antenna shows flat gain responses and flat radiated powers within the passband, and displays good frequency skirt selectivity. Measurement results show that the filtering antenna can operate at from 4.03- to 7.11 GHz, has a 3.08 GHz bandwidth, a 2.5 dBi average gain in the broadside (+Z) direction and nearly 30 dBm average radiated power within the passband.

Inspec keywords: transmission lines; broadband antennas; band-pass filters; antenna feeds; antenna radiation patterns

Other keywords: antenna radiation; composite right-left handed transmission line; zeroth-order mode; CRLH-TL resonator; first-positive-order mode; bandwidth 3.08 GHz; three-order antenna; ACS feeding; bandpass filter; simplified asymmetric coplanar strip feeding structure; frequency skirt selectivity; meander-line antenna; flat radiated powers; flat gains response; frequency 4.03 GHz to 7.11 GHz; miniaturised wideband filtering antenna

Subjects: Single antennas; Filtering methods in signal processing; Antenna accessories

References

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      • 2. Lin, C.-K., Chung, S.-J.: ‘A compact edge-fed filtering microstrip antenna with 0.2 dB equal-ripple response’. Proc. 39th European Microwave Conf., Rome, Italy, October 2009, Vol. 9, pp. 378380.
    5. 5)
      • 1. Chuang, C.-T., Chung, S.-J.: ‘New printed filtering antenna with selectivity enhancement’. Proc. 39th European Microwave Conf. Rome, Italy, October 2009, Vol. 9, pp. 747750.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.0329
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