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
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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