Second- and Third-Harmonic Backscatter Through a Bandstop Filter Using Defected Ground Structure

TL;DR

This paper introduces a novel harmonic-backscatter-rectifier that enables low-power, simultaneous rectification and harmonic-based communication using a defected ground structure filter, demonstrated at 1.85 GHz with high data rates.

Contribution

It presents a new harmonic-backscatter-rectifier with a dual-band reconfigurable filter for efficient harmonic modulation in backscatter communication systems.

Findings

Achieved 8 Mbps uplink data rate at -10 dBm RF power.

Demonstrated low energy consumption of less than 27.7 pJ/bit.

Implemented a passive harmonic tag with 12 kbps uplink at -6 dBm.

Abstract

In this brief, a novel harmonic-backscatter-rectifier (HBR) is introduced for simultaneous rectification and harmonic-based uplink. The proposed (HBR) employs a rectifier to generate both DC power and the harmonic carriers for backscattering communication, and a dual-band reconfigurable band-stop filter using defected ground structure(DGS) to modulate the second and third harmonics with low-power consumption and same input impedance at f0 all the time. As a proof of concept, an HBR prototype operating at 1.85 GHz was designed and experimented. An uplink data rate of 8Mbps (4Mbps x 2 ) was achieved when the HBR was fed with -10 dBm RF power, and the data modulation consumed less than 27.7pJ/bit. In addition, a passive harmonic tag was implemented with the proposed HBR and a low-power binary sequence generator, which demonstrated a continuous uplink of 12 kbps at -6 dBm RF power.