Wideband 400-Element Electronically Reconfigurable Transmitarray in X Band

Abstract

A fully electronically reconfigurable 400-element transmitarray is studied numerically and experimentally in Xband. The array operates in linear polarization and consists of 20×20 unit-cells. A 1-bit phase resolution has been selected for the unit-cell in order to reduce the complexity of the biasing network and steering logic, the insertion loss and the overall cost of the antenna system. The unit-cell stack-up is simple and is made of four metal layers: active side, biasing lines, ground plane and passive side. Two p-i-n diodes are integrated on the active side of each cell in order to control its transmission phase. The active array contains 800 diodes in total. It demonstrates experimentally pencil beam scanning over a 140×80-degree window over a 15.8% fractional bandwidth, with a maximum gain of 22.7 dBi at broadside. We also show that the same antenna array can be used for beam shaping applications (flattop beam). The experimental results presented between 8 and 12 GHz are in good agreement with the theoretical performance calculated using full-wave electromagnetic simulations and an inhouse CAD tool based on analytical modeling.

Multipath estimation technique for wideband mm-wave backscattering channels

“…The considered multi-antenna systems are composed of a focal source illuminating a planar array constituted of blocks called unit-cells. To achieve high directivity for personal radar applications, it has been shown that TAs with 400 elements are a good choice [5], [14], [16]. Consequently, we considered 20 × 20 unit-cells each with size of 2.5 × 2.5 mm 2 (i.e.…”

Environment Mapping with Millimeter-Wave Massive Arrays: System Design and Performance

“…Nowadays, several studies are focusing towards the miniaturization and the adoption of large scale arrays [1] for several ranging and localization applications, such as mobile communication [2], simultaneous localization and mapping (SLAM) [3], [4] or personal radars [5], thanks to the possibility to achieve a precise and high-scanning resolution given by the large number of adopted antennas [6]- [9].…”

A Wideband Transmitarray Using Double-Petal Loop Elements

“…A triple-layer transmitarray antenna is designed in [6], which achieves high gain of 28.9 dB at 11.3 GHz and bandwidths of 9% for 1-dB gain. Another approach is receiver-transmitter designs [10][11][12][13]. In this approach, a transmitarray antenna typically consists of two planar arrays of printed-type elements.…”