Single-Layer Dual-Band Slot-Array Antenna in Gap Waveguide Technology

This paper presents a dual-band slot-array antenna for satellite on-the-move applications. The antenna is formed by two kinds of slots working in the K band (Rx slots) and in the Ka band (Tx slots). A corporate feeding network implemented in gap waveguide technology is used to feed the slots. The use of this technology minimizes the losses in the structure and avoids mechanical assembly problems. In order to keep a low profile and a low weight in the structure, the feeding network is designed in one single layer combining adequately the use of ridge-gap and groove-gap waveguides. Dog-bone shaped slots are used in the Rx band to reduce the inter-slot spacing and minimize grating lobes problems. Results show a good return loss level within the two desired passbands, as well as the absence of grating lobes in the radiation pattern at both operating bands.