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- Circularly polarized microstrip antenna array for the Ka-bandPublication . Varum, Tiago; Matos, Joao; Duarte, Vanessa; Pinho, PedroThe growing needs of higher transmission rates lead to the use of the Ka frequency bands and multi-beam technology, in the satellite communications, allowing more coverage. This fact leads to the need for the use of directive antennas and beamforming techniques to achieve a precise control of radiation pattern. This paper presents the design of a circularly polarized microstrip antenna array, at 29 GHz, suitable to satellite communications. The array will be a module part to develop an ample antenna array suitable to fulfill the satellite requirements, and feed with an electronic beamforming network.
- Non-uniform microstrip antenna array for tolling using a single access lanePublication . Varum, Tiago; Matos, Joao; Pinho, PedroOver the last few years we have seen the progress of vehicular communications, as a way of development of the entire highway infrastructure, offering a set of new applications and functionalities to the users. The electronic collection for parking, tolls, gas stations, are some outcome of this technological development. This paper presents an antenna array according with the dedicated short range communications standards that rules the tolling applications, with the specific application in the access roads to highways. The radiation pattern with an innovative shape, combined with good wide operating band opens good perspectives for the application of this antenna in vehicular communications.