Abstract

Design and rapid prototyping of a tunable and compact microstrip antenna for industrial, scientific and medical (ISM) band applications is presented in this paper. Laser machining is introduced as a fast and accurate method for the antenna fabrication. The antenna, with an overall dimension of 65×46×0.125 mm, was fabricated by sandwiching a flexible Kapton polyimide substrate, with a dielectric constant of 3.5, between two flexible copper tapes, as the radiative patch and ground plane, respectively. The radiative patch was patterned in a meander configuration, with three slots, demonstrating the capability to reduce the resonant frequency of the microstrip antenna from 2.4 GHz to 900 MHz, without increasing the overall dimension of the antenna. Copper tape, with a thickness of 0.03 mm was selected, not only for its ease of use but also for its flexibility in tuning the antenna response to achieve the exact simulated results during the antenna experiment and eliminating the unavoidable differences between simulation and measurement outputs.

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