Uwb Antenna Design Thesis

Uwb Antenna Design Thesis-24
In general, 2D and 3D antenna technologies developed for wideband, multiband, and UWB applications can be divided into the following groups: microstrip antennas, monopole antennas over metal plates, printed monopole/dipole antennas, wide-slot antennas, metamaterial antennas, and dielectric resonator antennas (DRAs).These antennas may in some cases meet the demanding requirements of the existing communication systems, while they can be the starting point from which to develop new radiating systems suitable for the future communication requirements.

In general, 2D and 3D antenna technologies developed for wideband, multiband, and UWB applications can be divided into the following groups: microstrip antennas, monopole antennas over metal plates, printed monopole/dipole antennas, wide-slot antennas, metamaterial antennas, and dielectric resonator antennas (DRAs).These antennas may in some cases meet the demanding requirements of the existing communication systems, while they can be the starting point from which to develop new radiating systems suitable for the future communication requirements.

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However, although these antennas exhibit low-profile, small size, limited manufacturing costs, and easy circuital integration, they typically present low fractional bandwidths (FBW = 7%) not compatible with the modern wireless communication systems.

To overcome this drawback, a significant research activity has been performed in the last twenty years to identify new geometries suitable to satisfy those requirements.

The realized measured peak gain ranges between 1.9 d Bi and 6.3 d Bi, while the cross-polarization levels are of about 15 d B and 20 d B in the Figure 1: A monopolar patch antenna with a circular patch, circular ground plane, and two coupled metal rings [7]. Dark gray monopole and light gray dielectric substrate., has been presented in [9].

Two zig-zag slots and two rectangular notches have been inserted in the patch for achieving a wider impedance bandwidth with higher return loss levels.

In Section 7, directional UWB antennas are presented, in Section 8 metamaterial antennas are discussed, and in Section 9 antennas and materials useful to realize wearable antennas are considered, while in Section 10 the most recent advances of DRA antennas are illustrated.

The main techniques adopted to realize UWB antennas with notched bands are highlighted in Section 11.In Section 3, the characteristics of monopole antennas over metal plates are discussed.In Sections 4, 5, and 6, the performances of planar printed monopole, wide-slot, and dipole antennas for wideband and UWB applications are illustrated.As a first structure, a wideband patch antenna having a radiation pattern similar to that of a monopole and consisting of two metal rings coupled to a circular patch radiator, presented in [7] is illustrated.The antenna is printed on a circular grounded dielectric substrate (Di Clad 527), with relative permittivity , while a coaxial probe, located at the center of the circular patch, is used to excite the antenna (see Figure 1).Planar, printed, dielectric, and wearable antennas, achievable on laminate (rigid and flexible), and textile dielectric substrates are taken into account.The performances of small, low-profile, and dielectric resonator antennas are illustrated paying particular attention to the application areas concerning portable devices (mobile phones, tablets, glasses, laptops, wearable computers, etc.) and radio base stations.To excite the antenna, a probe is inserted between the first teeth of the zig-zag slots (see Figure 2).The zig-zag slots extend the current paths on the metal patch making the antenna less longer along the teeth direction reducing in this way the antenna dimensions.The antenna has been analyzed using the full-wave FEM-based HFSS [8].The antenna return loss is principally affected by the distances between the rings, between the first ring and the central radiating element, and by the radius of circular metal strip.

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