Design of Yagi‐like printed antennas for WLAN applications

Abstract

The half-moon antenna has been proposed for wideband applications. The half-moon antenna with variable tilt angles has been shown to have variable frequency band characteristics. The bandwidth of the proposed antenna is obtained from 1.5 GHz to more than 5 GHz. In this frequency band, omnidirectional radiation patterns have been observed. The radiation patterns are almost immune to the tilt angles. A description of how the proposed antenna gets the wideband operation in this half-moon structure is provided, and required equations are also derived. All the simulation and measured data agree very well with confirming the validity of our theory and the used models. The concept can be simply adapted to design for other antennas operating at different frequency bands. 2. W.L. Langston and D.R. Jackson, Impedance, axial-ratio, and receivepower bandwidths of microstrip antennas, ABSTRACT: A directive broadband printed Yagi-like antenna design is presented. We have focused on the 2.45 GHz WLAN band, at which some designs have been carried out. For the design and the modelling processes, we made use of FDTD based in-house developed algorithms. Some selected prototypes have then been fabricated onto a low-cost printed circuit board dielectric substrate and tested successfully. Bandwidths higher than 10% and moderate to high (Ͼ7 dBi) gains can be obtained this way. ABSTRACT: The concept of very simple planar high-pass filters using microstrip with short-circuited edge has been extended to filters with passbands beginning in the K and K a bands. Two examples of such filters have been designed using electromagnetic simulator and fabricated on 0.5-mm thick alumina substrate and on 0.254-mm thick low permittivity organic substrate. Theoretical characteristics have been compared with the experimental data demonstrating practical utility of the proposed filter concept at frequencies attaining the millimeter-wave range.

Broadband printed dipole with integrated via‐hole balun for WiMAX applications

“…The impedance matrix associated with 2 ), where N refers to the number of unknowns. Therefore, iterative solvers [3] appear as the only viable alternative as they require only matrix-vector product operations without forming all the entries of the dense matrices. Especially, the multilevel fast multipole algorithm (MLFMA) has been used to speed up the matrix-vector product with O(N log N) floating point operations to tackle huge industrial problems in practice [4].…”

“…We add a director element and a reflector element, as traditionally used in Yagi-Uda 'wired' antennas, and more recently extrapolated to Yagi-like printed antennas [3,4]. The antenna modified configuration is shown in Figure 4.…”

“…Nevertheless, many applications making use of wireless standards do not require mobility (wireless sensor networks, for instance). In these cases, directional antennas with high gain to improve the coverage are preferred [3,4].…”

“…The antenna has been designed with a FDTD algorithm developed by the authors [3,4]. Return losses are calculated by a Fourier Transform of the incident and reflected voltage in the feed line of the antenna.…”

Dual-band printed dipole antenna for Wi-Fi 802.11n applications

“…Antennas with dipoles printed on one side of the dielectric substrate can be easily fabricated, but additional elements (usually a phase-shifter [1], a microwave balun [2] or a coplanar stripline [3]) are required to provide the proper phase-feed in each arm of the dipole. Whether a bi-faced scheme is assumed, the proper feed of the dipole arms can be directly provided by the stripline feed, so reducing the final size of the antenna [4,5].…”