CST – Computer Simulation Technology

A Fully Dielectric Lightweight Antenna Array Using a Multimode Interference Power Divider at W-Band
Roland Reese ,, Matthias Jost,, Matthias Nickel, Ersin Polat, Rolf Jakoby and Holger Maune
IEEE ANtenna and Wireless Propagation Letters
Vol. 16, 2018, 1st January 0001
Antenna arrays, dielectric waveguides (DWs), millimeter-wave antennas, multimode interference
In this letter, we present a fully dielectric antenna array for the first time, including a single multimode interference power divider as feeding network. This allows a lightweight and compact antenna design in single dielectric waveguide technology since a cascading of multiple power dividers is avoided. Furthermore, the use of a single power divider instead of several cascaded ones reduces parasitic radiation, which occurs at discontinuities, such as bends or curvatures of dielectric waveguides. As demonstrator, we present a 1 × 4 antenna array fed by a single, four-port, multimode interference power divider, operating in the frequency range from 85 to 105 GHz. It ismade froma single sheet of cross-linked polystyrene Rexolite. Each antenna element of the array consists of a tapered dielectric rod antenna of rectangular shape. In the measurements, the antenna array exhibits a halfpower beamwidth of 12° in the H-plane and a gain of 16.9 dBi at 95 GHz accompanied by a sidelobe level of around −11 dB. The antenna array shows a good matching with a return loss higher than 15 dB in the desired frequency range.

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