Open AccessCompact filtering antenna using CRLH resonator and defected ground structure
Author(s) -
Chen L.,
Luo Y.L.
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2014.2703
Subject(s) - passband , band pass filter , physics , resonator , bandwidth (computing) , antenna (radio) , acoustics , computer science , telecommunications , optics
A compact ltering antenna with high band‐edge gain selectivity using a composite right‐/left‐handed (CRLH) resonator and a defected ground structure is presented. The CRLH resonator resonates at the zeroth‐order mode and acts as the first stage of the corresponding filter; an octagonal patch acts as a radiator as well as the last stage of the lter. The design procedure follows the circuit approach – synthesis of bandpass lters. The ltering antenna has two poles in the passband and two radiation nulls (zeros) at the band edges. Compared to the conventional patch antenna, the proposed filtering antenna, with little extra circuit area, has flat gain response within the passband, good selectivity at the passband edge and wider bandwidth. Measurement results show that the ltering antenna can operate at 5.29 GHz, has a 430 MHz bandwidth and a 2.5 dBi antenna gain in the broadside (+ Z ) direction within the passband.