Open AccessCompact four bands hybrid filtering antenna using step impedance resonators and tuning stub transition structures
Author(s) -
Chen KengHsien,
Lo YuChen,
Lee YiShi,
Wu SungJung,
Tarng JennHwan
Publication year - 2018
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.2017.0830
Subject(s) - stub (electronics) , resonator , electrical impedance , electronic engineering , materials science , impedance matching , acoustics , optoelectronics , physics , engineering , electrical engineering
A novel compact four bands hybrid filtering antenna composed of a hybrid radiator and a four bands bandpass filter is presented. The hybrid radiator is constructed using the micro‐strip line fed, the square‐ring and the T‐stub near the ground plane. The proposed four bands bandpass filter is composed of two parts, one is two‐step impedance resonators (SIRs) and the other is the tuning stub transition structure. With tuning stub transition structure, two SIRs effectively match to 50 Ω hybrid radiator. Furthermore, the geometry of the proposed filter is U‐shaped with the micro‐strip fed around the hybrid radiator. The evolution of the hybrid radiator and the construction of the four bands bandpass filter using the two SIRs and the transitions are discussed in detail. The proposed filtering antenna not only possesses numerous operation bands with good band edge gain selectivity but also reduces the occupied size in the modern communication device. The overall size of the proposed filtering antenna is 33 mm × 36.4 mm × 0.508 mm, and the operation frequencies are 1.8/2.45/3.5/5.2 GHz bands for GSM1800/WLAN/WiMAX applications. The measured results agree with simulated outcomes.