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2020-12-14

CPW-Fed Dual-Band Compact Yagi-Type Pattern Diversity Antenna for LTE and WiFi

By Naveen Kumar Maurya and Rajarshi Bhattacharya
Progress In Electromagnetics Research C, Vol. 107, 183-201, 2021
doi:10.2528/PIERC20090905

Abstract

This paper presents a compact generalized T-shaped printed pseudo-monopole antenna (GeT-PPMA) driven dual-band Yagi-type pattern diversity antenna. In contrary to the common practice, here impedance matching at the lower band is attained by increasing the quality factor (Q) through folding a monopole strip. Afterwards, a GeT-PPMA having relatively lower Q than that of the T-PPMA is proposed. Compared to the simple T-PPMA, the GeT-PPMA has 1.5 times more bandwidth (BW) at the lower band. The dual-band GeT-PPMA is 15.11% more compact than the corresponding straight PPMA(S-PPMA). A highly compact dual-band Yagi-type pattern diversity antenna of size 45.5×63 mm2 i.e. 0.35λ0 x 0.48λ0, where λ0 is the free space wavelength at the lowest frequency of operation, is designed by using a novel arrangement of two directors and two common folded reflectors. The compactness owes to the folding of the reflectors. The length of the reflector is optimized for providing good front-to-back-ratio (FBR) in the lower band. The length of the two directors is optimized to improve the FBR at the upper band. Usage of the folded reflector is found to degrade the isolation level in the lower band. Near-field analysis is carried out to investigate the mechanism of mutual coupling. Being guided by the near-field study, a λg/2 isolator, where λg is the guided wavelength at the lower band, is placed in the gap of the folded reflectors, and the mutual coupling is reduced by about 5 dB.

Citation


Naveen Kumar Maurya and Rajarshi Bhattacharya, "CPW-Fed Dual-Band Compact Yagi-Type Pattern Diversity Antenna for LTE and WiFi ," Progress In Electromagnetics Research C, Vol. 107, 183-201, 2021.
doi:10.2528/PIERC20090905
http://jpier.org/PIERC/pier.php?paper=20090905

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