This paper presents a quasi-conformal transformation optics (QCTO) based three-
dimensional (3D) retroreflective flattened Luneburg lens for wide-angle millimeter-wave …

This article introduces retroreflective lenses for millimeter-wave radio-frequency indoor
localization. A three-dimensional (3D) gradient-index Luneburg lens is employed to …

The paper describes the development of passive, chipless tags for a novel indoor self-
localization system operating at high mm-wave frequencies. One tag concept is based on …

In this paper, we propose a Photonic Crystal (PhC) resonator based corner reflector for
sensing the Angle-of-Arrival (AoA) of the incident wave from an interrogator. The sensor is …

For a novel indoor‐localization system, chipless tags with high retro‐directive radar cross‐
section (RCS) under wide‐angle incidence are required as fixed landmarks. Tags based on …

An earlier version of this paper was presented at the 2021 15th European Conference on
Antennas and Propagation (EuCAP) and was published in its Proceedings. This paper …

Depolarizing mm-wave chipless radio frequency identification (RFID) tags based on
grounded dipole resonators characterized by an extremely thin profile are proposed. The …

A frequency selective surface (FSS) based chipless RFID tag is designed at mm-Wave
range. It is shown that the proposed design methodology can provide a multiresonant cross …

Innovating passive and chipless coded landmarks have recently emerged for high accuracy
self-localization systems. Existing landmarks make use of the combination of retro-directive …

Frequency-coded corner reflectors (CR) have been proposed as an essential component of
chipless indoor localization systems at sub-terahertz frequencies. These tags operate by …