Miniaturized UWB Log-Periodic Square Fractal Antenna

Abstract

In this paper the log-periodic square fractal geometry is presented for the design of a miniaturized patch antenna for the UWB services (3.1-10.6 GHz). A miniaturization factor of 23 percent is achieved with a constant and stable gain in the desired band. The radiation pattern is broadside, which finds suitable applications in the UWB radars and medical imaging. Furthermore, the time-domain performance of the proposed antenna is investigated. A prototype model of the proposed antenna is fabricated and measured as a proof of concept.Index Terms-Fractal antenna, log-periodic antenna, microstrip antenna, UWB antenna.

Miniaturization of a Microstrip Patch Antenna with a Koch Fractal Contour Using a Social Spider Algorithm to Optimize Shorting Post Position and Inset Feeding

“…Several techniques have been used in the miniaturization of microstrip patch antennas [7], such as material loading [8,9], shorting and folding [10][11][12][13][14], reshaping [15][16][17][18][19][20], modifying the ground plane [21,22], using metamaterials [23][24][25], and using fractal contours [26][27][28][29][30].…”

“…The most frequently used are neural networks [33,34], genetic algorithms [34][35][36], and particle swarm optimization [37,38]. This paper proposes the use of a Koch fractal geometry [16][17][18][19][20][26][27][28][29][30] combined with a shorting post [10][11][12][13] to provide a very significant reduction of the resonant frequency enabling the miniaturization of a microstrip patch antenna. The approach is focused on the optimization of the shorting post (position and radius) and inset feeding line (width and length) using a social spider optimization (SSO) algorithm, based on the collective behavior of spiders [39,40].…”

A half cut design of low profile UWB planar antenna for DCS/PCS/WLAN applications

“…Moreover, an inverted cone slotted planar antenna for wireless body area network (WBAN) application is presented which operate in the range 3 to 18 GHz . The miniaturization of UWB antenna is achieved by using square fractal in log periodic antenna, the multiple band antenna can also be achieved, in UWB range by creating fractal structure in the ground plane, suitable for WLAN, WiMAX, and X band applications …”

Semi-circular Slotted Monopole Antenna for Future Ultra-Wideband Applications

“…For future UWB system at higher frequency beyond 11 GHz [11], there is a necessity of an ultra-compact antenna which can cover present as well as future UWB systems. From [12][13][14], it is evident that the antenna structure offers wide bandwidth performance.…”