Abstract
This paper proposes a printed log-periodic dipole antenna (LPDA) for ultra wide bandwidth (UWB) applications. The antenna comprises of cascading four U shaped elements of different line lengths with balun circuit to improve the antenna impedance matching. The proposed antenna dimensions are 50 × 50 mm2 with FR4 substrate thickness 0.8 mm. Full-wave EM solver HFSS (High Frequency Structure Simulator) is used for modeling the proposed antenna. The pulse distortion is verified by the measured the proposed antenna performance with virtually steady group delay. The simulation and experimental results show that the proposed antenna exhibits good impedance matching, stable radiation patterns throughout the whole operating frequency bands, acceptable gain and stable group delay over the entire operating band. An UWB extended from 1.85 GHz to 11 GHz is obtained, and the average antenna gain is about 5.5 dBi over the operating band with peak gain around 6.5 dBi and 70% average radiation efficiency.
Highlights
Much progress has been made in ultra-wideband (UWB) applications with high data rate communications in short distances with low fabrication cost
This paper proposes a printed log-periodic dipole antenna (LPDA) for ultra wide bandwidth (UWB) applications
The simulation and experimental results show that the proposed antenna exhibits good impedance matching, stable radiation patterns throughout the whole operating frequency bands, acceptable gain and stable group delay over the entire operating band
Summary
Much progress has been made in ultra-wideband (UWB) applications with high data rate communications in short distances with low fabrication cost. UWB system antennas demand serious challenges to achieve wide impedance bandwidth, compact size, high gain, linear group delay, stable radiation patterns. In this paper a new proposed ultra wideband antenna, is presented which consists of a combined structure of different lengths of printed U-shaped LPDA fed by CPW and balun circuit to improve the impedance matching. These bands are used for different wireless communications applications and for UWB applications. The proposed USLPDA antenna introduces USUWB with the multiple resonant property and compact size compared to earlier designs where ultra wide bandwidth was realized using a rectangular slot [9].
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