Reflective array antenna

About: Reflective array antenna is a research topic. Over the lifetime, 4366 publications have been published within this topic receiving 57884 citations.

A zero-index metamaterial unit-cell for antenna gain enhancement

Abstract: A new metamaterial unit-cell with a zero refractive index (n) was developed, characterized and employed for the gain enhancement of a microstrip antenna operating at 5.2 GHz. The unique property of the metamaterial gathers the wave radiated from the antenna and collimates it towards the normal direction when used as a superstrate array. The proposed design provides a gain enhancement of 6.2 dB using a single layer superstrate, when suspended above a microstrip patch at 5.2 GHz.

Tilting antennas to reduce line-of-sight microwave link fading

Abstract: Tilting the antennas up to obtain 2 dB loss (for each antenna) over maximum gain during steady signal conditions is shown to reduce fading over this particular path. The technique should also work on other paths where sufficient angular separation between the direct and reflected rays exists, and where antennas with sufficiently "sharp" main beams are used.

New developments of the wire-patch antenna for ceramic technology and multifunction applications

Abstract: The design of antennas for industrial applications has been an important goal and especially for mobile telecommunications. So many functions at different frequencies must be available on an aircraft, on a boat and even on a car that the number of antennas increases on these mobiles. In the case of cars, there are also problems of aesthetics and vandalism. It is essential to study techniques to reduce the bulk of these systems. The wire-patch antenna structure is useful for reaching this goal and this paper presents how we can use it to improve the integration of antennas for these applications, using ceramic materials and regrouping different functions in multifunction antennas. Some examples of such antennas, which have been theoretically designed using FDTD code (see Reineix, A. and Jecko, B., IEEE Trans. Antennas and Propagation, vol.37 no.11 p.1361-9, 1989), are presented. First, a brief summary of wire-patch technology is given.

Base station device achieving effective use of frequencies by changing structures of antennas

Abstract: A base station device provided with a plurality of antennas has a mode, in which all the antennas are used, and a mode, in which the plurality of antennas are divided into a plurality of groups each including two or more antennas to be used independently. An array antenna pattern is formed selectively in these modes. When the array antenna pattern is to be formed in the mode of using all the antennas, a signal of one synthesizer is applied to transmission/reception circuits of all the antennas. In the mode of using antennas divided into the plurality of groups, signals of different synthesizers are supplied to the transmission/reception circuits of the antennas.

Application of transmitarray antennas for indoor mapping at millimeter-waves

Abstract: Millimeter-waves are expected to play a key role in next 5G scenario due to the availability of a large clean unlicensed bandwidth at 60 GHz and the possibility to realize packed antenna arrays, with a consequent increase of the communication capacity and the introduction of new functionalities, such as high-definition localization and personal radar for automatic environment mapping. In this paper we propose the adoption of millimeter-wave transmitarrays for personal radar applications and we investigate the impact of the radiation pattern characteristics on the map reconstruction accuracy, by analysing how the number of array elements, of quantization bits and the focal distance affect the environment reconstruction performance.