A Novel Design of Folded Dipole for Broadband Printed Yagi-Uda Antenna

Abstract

Abstract-In this paper, a printed wideband Yagi-Uda antenna with a novel folded dipole driver is proposed. The folded dipole driver is comprised of a folded dipole and a microstrip feedline which functions as an internal balun to mainly determine its wide impedance bandwidth. With the optimized parameters, an operating band of 1.69 GHz ∼ 2.72 GHz can be obtained. Besides the folded dipole driver, the broadband printed Yagi-Uda antenna also consists of three directors and a reflector. Its wideband performance is mainly determined by the folded dipole driver, while the reflector and directors improve its performance slightly. By optimizing the geometrical parameters of the folded dipole driver, a bandwidth of 61.8% (1.53 GHz ∼ 2.93 GHz) for return loss being higher than 10 dB is achieved. The proposed printed Yagi-Uda antenna is realized on FR4 substrate with a measured operating bandwidth of 62% (1.51 GHz ∼ 2.94 GHz), a flat gain (5.6 dB ∼ 7.3 dB), more than 10 dB front-to-back ratio and lower than −15 dB cross-polarization level.

Design and fabrication of triple‐band folded dipole antenna for GPS/DCS/WLAN/WiMAX applications

“…An antenna operating at 1.65‐2.85 GHz has been designed for 2G/3G/LTE systems . Wang et al proposed an antenna applicable to PCS/WCDMA/WLAN/LTE applications by generating a resonance at 1.69‐2.72 GHz with a folded antenna . In addition, in References , resonances occurred at 1.82‐2.65, 5.07‐6.16, and 1.15‐4.07 GHz, respectively.…”

Wideband Quasi-Yagi Antenna Design and Its Usage in Mimo/Diversity Applications

“…On the other hand, much attention have been drawn to avoid the bottleneck brought by the drivers. The bandwidth of quasi-Yagi antennas could be broadened by using folded dipole drivers [5,6], tapered driver [7] or bowtie driver [8]. In addition, wideband quasi-Yagi antenna also could be achieved with the dual-resonant driver [9], though the use of capacitors and inductors could bring additional loss of energy.…”

“…With the rapid development of wireless communication systems, there are urgent demands for wideband quasi-Yagi antennas. Various technologies have been developed to broaden the bandwidth of quasi-Yagi antennas [1][2][3][4][5][6][7][8][9]. Coplanar waveguide (CPW)-to-slotline transitions [1,2] are convenient to be used to improve the bandwidth of quasi-Yagi antennas.…”

Design of a Wideband Planar Microstrip-Fed Quasi-Yagi Antenna

“…A microstrip-to-slotline transition (MS-to-ST) was proposed in [6], and a measured bandwidth approximately 46% was achieved. Other feeding structures such as artificial transmission line based MS-to-CPS transition balun or tapered line, MS-fed, CPW-fed were proposed in [7][8][9][10][11]. However, those complex feeding structures would not only increase design complexity but also increase the size of the antenna.…”