Integrated antennas for millimetre-wave asset tracking

Abstract

A soft board-board millimetre wave subarrayed Van Atta antenna has been designed fabricated and measured for asset tracking applications at 62GHz. Soft-board, 254 µm thickness and 2.19 relative permittivity, single and array patch antennas were designed and characterised. The elements and arrays are designed to be connected via microstrip to WR-15 waveguide transitions. Measurements of insertion loss for the transition have been performed and the transition used to allow patch array and subarray absolute gain values to be computed. The performance of the Van Atta Array is also given and peculiarities of its performance at mm-wave frequencies described. The characteristics of a millimetre wave integrated Silicon antenna are discussed also. The frequencies chosen for this work are 62.5 and 65.5 GHz. These are transmit and receive frequencies allocated for broadband Mobile wireless applications [1].

60 GHz Microstrip Van Atta Arrays for Millimeter Wave Identification and Localization

“…To overcome the limitations related to narrow interrogation angle and low reflection coefficient, Van Atta arrays were proposed [5]- [7] which re-radiate incident waves back in the direction of their arrival independently of the angle of incidence. For this reason a high level of RCS with small variations in a wide angle of interrogation can be obtained.…”

“…Both aforementioned types of Van Atta arrays can be used in chipless RFID systems yet the literature lacks any comparison of their characteristics, especially in the 60 GHz band proposed for MMID systems. Passive co-polarized Van Atta array designed for this band was presented in [7] but no comparable simulation or measurement results were provided and to the best of the authors' knowledge the concept of crosspolarized microstrip Van Atta arrays was not investigated in this band before. Therefore, in this paper we present comparison of the design and performance of co-polarized and crosspolarized one-dimensional microstrip Van Atta arrays with different spectral signatures in the 60 GHz band.…”