Title :
A Small and Bandwidth-Extended Dipole Antenna With Nonperiodic Left-Handed Transmission Line Loading
Author :
Wei-Ping Cao ; Shafai, L. ; Bing-Zhong Wang ; Si-Min Li ; Bei-Bei Li
Author_Institution :
Key Lab. of Cognitive Radio & Inf. Process., Guilin Univ. of Electron. Technol., Guilin, China
Abstract :
A miniaturized and bandwidth-extended dipole antenna using a nonperiodic left-handed (LH) transmission line is proposed. The LH transmission-line structure is composed of a ladder network of unit cells having different series capacitors and shunt inductors. The radiation performance of a four-cell nonperiodic LH dipole antenna is compared to the periodically loaded antenna with the same size. Simulated and measured results show that, when the length of the antenna is about 0.2λ0, a 4.8% impedance bandwidth for | S11 | ≤ - 10 dB can be obtained through appropriately nonperiodic LC loading without any additional matching network, and well-behaved radiation patterns have been displayed.
Keywords :
antenna radiation patterns; dipole antennas; transmission lines; LH transmission-line structure; antenna radiation patterns; bandwidth-extended dipole antenna; four-cell antenna; ladder network; nonperiodic LC loading; nonperiodic left-handed transmission line loading; periodically loaded antenna; series capacitors; shunt inductors; unit cells; Antenna measurements; Antenna radiation patterns; Bandwidth; Dipole antennas; Loaded antennas; Power transmission lines; Resonant frequency; Impedance bandwidth; left-handed dipole; nonperiodic loading;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2014.2326433
