Open AccessPolarisation reconfigurable dual‐band circularly polarised patch antenna with defected ground plane for C‐band wireless applications
Author(s) -
Jhajharia Tejpal,
Tiwari Vivekanand,
Bhatnagar Deepak
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.6214
Subject(s) - pin diode , ground plane , patch antenna , axial ratio , multi band device , optics , physics , microstrip antenna , antenna (radio) , reconfigurable antenna , diode , optoelectronics , electrical engineering , circular polarization , coaxial antenna , microstrip , engineering
Here, a novel geometry of dual‐band polarisation reconfigurable patch antenna is presented. The proposed prototype design consists of two orthogonal arms as a patch, an inclined slotted asymmetric pentagonal‐shaped ground plane and a PIN diode with a biasing circuit. The polarisation reconfiguration is controlled via ON/OFF states of the PIN diode. The unique feature of the proposed antenna design is that it provides polarisation reconfiguration without considerable deviation in −10 dB impedance bandwidth (IBW) frequency response. The proposed antenna has a measured −10 dB IBW of 49.28% (3.96–6.55 GHz) and 41.47% (4.3–6.55 GHz) in the ON‐state and OFF‐states of the PIN diode, respectively. In the ON‐state of the PIN diode, the antenna exhibits a dual‐band circular polarisation. The first 3 dB axial ratio (AR) band is 4.5% (4.3–4.5 GHz) and the second 3 dB AR band is 17.69% (5.1–6.09 GHz). The proposed antenna exhibits almost uniform gain over the entire operating axial‐ratio bandwidth, with peak CP gain of 2.8 dBic. The suggested antenna has a wide −10 dB IBW, and it is suitable for C‐band wireless applications.