Low-profile and low-cost transmitarray antenna at 122 GHz based on unit-cells with 1-bit phase resolution

Publikationstyp
Journal Article
Date Issued
2020-11-26
Sprache
English
Author(s)
Frank, Martin  
Lurz, Fabian  
Weigel, Robert  
Kölpin, Alexander  orcid-logo
Institut
Hochfrequenztechnik E-3  
TORE-URI
http://hdl.handle.net/11420/8239
Journal
Electronics letters  
Volume
56
Issue
24
Start Page
1293
End Page
1295
Citation
Electronics Letters 24 (56): 1293-1295 (2020-11-26)
Publisher DOI
10.1049/el.2020.2088
Scopus ID
2-s2.0-85097289091
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.