Satellite communication with moving vehicles on earth: Two prototype circular array antennas

Abstract

The performance of two minimal prototype antennas validates a novel design concept for a vehicle‐borne antenna for communications via satellite: the toroidal beam antenna implemented by a ring or rings of microstrip patches. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 14–16, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11112

Omnidirectional Radiation in the Presence of Homogenized Metasurfaces

“…As for the linear array of slots (strips), (25) is accurate for thin slots, i.e., s d, and dense grids, i.e., d λ; furthermore, when the media on the two sides of the array are different, the parameters k and η to be used in (25) are those of an effective medium with relative permittivity equal to the average of those of the two media. We note that the structure described from (25) is spatially dispersive.…”

“…We remind that spatial dispersion is intrinsically taken into account by the TEN and TEN-PO approaches in Sections 2.2 and 2.3, respectively, whereas can be approximately considered by the MoM method in Section 2.4, assuming that the field excited by the elementary source is dominated by a given surface or leaky wave. In the latter case, the radial propagation wavenumber k SW/LW ρ of the relevant surface or leaky wave is used in (25). In Fig.…”

“…In particular, the possibility of producing azimuthally symmetric fields has attracted interest for antenna designs with conical radiation patterns and reconfigurable polarization [19], which may be employed in Local Area Networks [20][21][22][23] as well as in radio links between satellites and moving vehicles [24][25][26]. In this framework, two-dimensional (2-D) leaky-wave antennas (LWAs) provide versatile, low-profile, and lowcost solutions for achieving directive radiation patterns, in the form of conical scanned or broadside pencil beams [27].…”

Effect of uniform and Dolph--Chebyshev excitations on the performance of circular array antennas

“…Circular antenna arrays (CAAs) have many potential applications in wireless technology such as radar and satellite [1,2]. While comparing other planar arrays, like rectangular arrays, CAAs are beneficial as they have flexible and symmetric radiation patterns [3], have full azimuth scan capability [4,5], are nearly omnidirectional [6], and are conformal to the surface.…”

New circularly‐polarised conical‐beam microstrip patch antenna array for short‐range communication systems

“…A method of realizing circularly-polarized conical beam antennas, using an array of radiating elements, was previously discussed in [3][4][5][6]. Four elements of monopole radiators and a slot antenna spherical antenna array were considered in [3,4], whereas in [5] a set of axial-mode helical antennas was used; in both cases the radiating elements occupied an appreciable volume.…”