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This paper presents a series-fed two-dipole antenna, fabricated on a liquid crystal polymer (LCP) substrate using inkjet-printing technology. The radio frequency characteristics of inkjet-printing silver film onto an LCP substrate are studied using the microstrip line. The proposed antenna consists of two modified dipole elements of distinct lengths: a modified ground plane and a balun filter yielding a wide bandwidth with bandpass responses. The proposed antenna can be used at frequency band of 26-33 GHz. The bending behaviors of the microstrip line and antenna are also measured. Inkjet printing on LCP substrates provides a low-cost, compact, and flexible packaging solution that can be used in future communication technology. Index Terms-Antenna, balun filter, bending, inkjet printing, liquid crystal polymer (LCP).

Inkjet-printing technology is utilized to fabricate a bandpass filter on a Liquid Crystal Polymer (LCP) substrates. Silver nanoparticle colloidal solution is used as the printing ink. The conductivity and thickness of silver film are 1~2×10 7 Siemens/m and 3.6 μm, respectively. The hairpin bandpass filter has been developed using inkjet printing technology. Bending effect causes frequency shift and insertion loss reduction due to material deformation while bending the LCP substrate.

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