No abstract

No abstract

A low-cost inkjet printing method for antenna fabrication on a polyethylene terephthalate (PET) substrate is presented in this paper. An office inkjet printer is used to have desired patterns of silver nanoparticle ink on the PET substrate without any postprocessing. Silver nanoparticle ink cures instantly as soon as it is ejected from the printer on a chemically treated PET substrate. The thickness of the silver nanoparticle layer was measured to be 300 nm with a sheet resistance of as low as 0.3 Ω/sq and a conductivity around 1.11 × 10 7 S/m with single layer deposition. A coplanar waveguide-(CPW-) fed Z-shape planar antenna on the PET substrate achieved the measured radiation efficiency of 62% and the IEEE gain of 1.44 dBi at 2.45 GHz. The printed antenna is also tested in bending conditions to ascertain its performance for the Internet of things (IoT) conformal applications for the future 5G network.

No abstract

In this paper, a broadband, low profile, hybrid water antenna is proposed. The hybrid structure combines the resonance of the dielectric resonator (DR) and the resonance of the monopole together to cover the required frequency band. The unique features of the water DR are transparency, reconfigurability, and liquidity which allows complex structures (including the antenna feeding line) to be placed and tuned inside water easily. Both the computer simulations and measurements are conducted to validate the antenna performance. The proposed antenna has a -6 dB impedance bandwidth from 430 to 900 MHz (a fractional bandwidth of 70%). Compared with other antennas for this band, this new antenna has a wider bandwidth, more compact size and simpler structure. It is therefore a very promising candidate for hand-portable applications such as DVB-H (470 to 862 MHz). Index Terms-water antenna, broadband antenna, liquid dielectric, DVB-H.