Open AccessCircularly polarised filtering monopole antenna based on miniaturised coupled filter
Author(s) -
Cheng Wenbin,
Li Dagang
Publication year - 2017
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2017.1094
Subject(s) - return loss , optics , bandwidth (computing) , physics , antenna (radio) , bent molecular geometry , radiation pattern , monopole antenna , filter (signal processing) , impedance matching , acoustics , electrical impedance , computer science , electrical engineering , telecommunications , engineering , structural engineering , quantum mechanics
This Letter proposes a circularly polarised (CP) monopole antenna with filtering function, which is achieved by integrating a miniaturised coupled filter based on the bent‐loop resonators. The circular‐polarisation is obtained by using the falcate‐shaped patch as the radiation part, and the existence of the coupled filter in the feeding line would not affect the CP radiation performances. Both numerical simulation and experimental demonstration are performed for the designed CP filtering antenna, and good agreements are obtained. The designed antenna with dimension of 70 × 75 mm 2 exhibits good frequency selective performances for the return loss, gain and axial ratio at 2.45 GHz with measured impedance matching bandwidth (| S 11 | < 10 dB) of 0.23 GHz. Such CP filtering antenna is a good candidate for the emerging application area, e.g. wearable biotelemetric devices.