This paper presents a slot-fed dual-ports rectangular patch antenna suitable for harmonic transponders to be employed in logistics. The antenna is fed with two orthogonal H-slot apertures. The two sides of the patch have their first resonance at f(0) and 2f(0), respectively. The developed multi-layer layout is optimized to obtain a compact two-piece tag, where the microstrip circuit components (frequency doubler, microcontrollers, sensors and so forth) and the H-slot apertures can be realized on a thin laminate (possibly a flexible substrate) which can be stuck in the interior of a parcel, while the patch can be easily realized at the exterior of a parcel. A proof-of-concept prototype has been realized using standard laminates in the frequency range 1.22-2.44 GHz. The obtained results confirm the theory, and open the door to a new class of harmonic tags for logistics applications.
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