access icon free Compact, wideband-printed quasi-Yagi antenna using spiral metamaterial resonators

A novel structure for size reduction and bandwidth enhancement of quasi-Yagi antenna using spiral resonator (SR) metamaterials is presented. The basic resonance is produced through excitation of simple quasi-Yagi antenna elements through a microstrip feedline while parasitic SR metamaterials augment bandwidth. The antenna is designed on an glass-reinforced epoxy laminate sheets (FR4) substrate with a dielectric constant of 4.4 and a thickness of 1.6 mm. Compared to original printed quasi-Yagi antennas, the size of the proposed quasi-Yagi antenna is reduced by ∼53%. Simulation results show that the proposed antenna has the impedance characteristics with a frequency bandwidth of 1.43–3.97 GHz (94%) for return loss more than 10 dB and a gain of 3.4–5.2 dBi in the corresponding frequency range. The designed antenna presents an end-fire radiation with a front-to-back ratio >10 dB. The antenna is fabricated, and measurement results demonstrate compactness and wide bandwidth of the antenna.

Inspec keywords: antenna feeds; broadband antennas; permittivity; metamaterial antennas; microstrip antenna arrays; Yagi antenna arrays; microstrip resonators; spiral antennas; antenna radiation patterns

Other keywords: impedance characteristics; end-fire radiation; dielectric constant; FR4 substrate; parasitic SR metamaterials; microstrip feedline; spiral metamaterial resonators; return loss; bandwidth enhancement; compact wideband-printed quasiYagi antenna; front-to-back ratio; size reduction

Subjects: Antenna accessories; Antenna arrays; Dielectric materials and properties; Waveguide and microwave transmission line components; Metamaterials and structures (microwave)

References

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      • 6. Ta, S.X., Park, Y., Choo, H., et al: ‘Slot-line-fed quasi-Yagi antenna’. 2010 9th Int. Symp. on Antennas Propagation and EM Theory (ISAPE), Guangzhou, China, 29 Nov – 2 Dec, 2010.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.2149
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