A multi-beam antenna with a dual band operation in the 28 GHz and 31 GHz millimeter wave band is presented. The antenna has a gain of around 15 dBi in each of the three ports. The spatial footprint of the antenna is 166 mm x 123 mm x 34 mm. A waveguide lens-based approach is used to attain this gain. Cylindrical to planar wavefront transformation by a phase extraction and compensation method drives the design of the antenna. The dual band operation of the antenna aids in transmitting and receiving at two independent frequencies. Three beams originating from a shared aperture are designed to target directions of -60°, 0° and 60°. These features make the antenna a potential candidate for 5G millimeter wave applications.
A low profile scanning antenna for reception of S-DMB is under development in the frame of the ESA funded project "Cost-Optimised High Performance Active Receive Phase Array Antenna for Mobile Terminals (CORPA)". The aforementioned project objectives are the design, prototyping and testing of a complete antenna based on digital beam forming (DBF) providing multimedia reception within the S-DMB system. The antenna is able to electronically scan a circularly polarised beam in the range 8 to 72 degrees, covering DMB satellites and including some margin for vehicle tilt. A conformal, phased array antenna based on DBF has been selected providing an attractive solution for such medium gain antenna. Moreover, DBF allows avoiding a complex phase calibration and provides a good auto-tracking performance in a harsh environment in terms of multipath and interference.
Mobile satellite terminals for data applications at the L-, S-, or C frequency band, respectively, face the problem of minimum antenna size requirements due to limited satellite transmit power and shape constraints of the antenna, e.g., for low drag for aeronautical application. However, mechanical steering makes the antenna platform bulky and obtrusive, and thus little attractive for a larger market. Conformal array antennas utilising digital beam forming (DBF) can provide an attractive solution for medium gain antennas. This paper discusses design and implementation of an S-band DBF conformal receive antenna for land mobile terminals.Index Terms-Mobile satellite terminal, digital beam forming, conformal array
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