Open AccessLow‐profile and low‐cost transmitarray antenna at 122 GHz based on unit‐cells with 1‐bit phase resolution
Author(s) -
Frank M.,
Lurz F.,
Weigel R.,
Koelpin A.
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2020.2088
Subject(s) - directivity , antenna (radio) , optics , phase (matter) , materials science , wideband , aperture (computer memory) , antenna gain , antenna aperture , resolution (logic) , beam (structure) , layer (electronics) , optoelectronics , physics , acoustics , radiation pattern , electrical engineering , engineering , computer science , quantum mechanics , artificial intelligence , composite material
This Letter presents the design of a low‐profile and low‐cost transmitarray antenna operating at 122 GHz. The transmitarray design is based on unit‐cells with 1‐bit phase resolution. A single RO4350B substrate layer is used to form the unit‐cells resulting in a total thickness of 0.326 mm. A wideband shift in the transmission phase of 180 ° is generated by rotating one metal layer of the unit‐cell by 180 ° . The simulation of the transmitarray with 30 × 30 elements and a feed distance of 35 mm shows a maximum directivity of 28 dBi at 122 GHz. Steering angles of 0 ° and 15 ° are investigated. Measurements of the fabricated transmitarrays are performed with an open waveguide and a package antenna as feed showing similar results but slightly different maximum relative gain values of 11.8 and 9.5 dB for the 0 ° version. The measured main beam directions are in good agreement with the simulations and the design values.