Logarithmically periodic antenna designs

Novel logarithmically periodic planar antennas for broadband polarization diversity reception

“…planar antennas may also adhere to the principle of self-complement as in [14,15] and are therefore well suited for the integration in a wideband transmission system. In contrast to spiral antennas, multi-terminal log.-per.…”

“…Log.-per. antennas based upon the rectangular unit cell were reported in [14,15]. Antenna realizations in terms of triangular-and sinusoid basis functions are given in [23,24].…”

“…Log.-per. structures are suitable representatives concerning the design of antenna modules with theoretically frequency-independent transmission characteristics [14,15]. Providing an adequate geometrical shape, they offer polarization-invariant transmission behavior and are therefore well suited for the integration in a broadband polarization diversity system.…”

A Design of LPDA Antenna with Patch Dipoles for Airbone Communication

“…LPDA(Log Periodic Antenna) is proposed in 1957,it is a kind of directional antenna [1][2][3][4][5][6],LPDA is a FI(frequency independent)antenna, FI is that the antenna is transformed by a proportional factor τ,the performance of antenna operating requency is equal to antenna operating frequency.LPDA has wider bandwith, which can be designed as 10:1(the ratio of the highest frequency to the lowest frequency),obviously,LPDA belongs to UWB(Ultra Wide Band)antenna [7].The profile of traditional LPDA [8]is relatively high,and its flexibility is not very ideal,but we can replace traditional dipoles with patch dipoles to research airborne antenna.Patch-dipoles LPDA is better to keep correspondence with the wing of aircraft,what's more,its electrical properties is less affected by the deformation of the wing.so we design a patch-dipoles LPDA applied to airborne antenna.…”

Design and Simulation of Circular Arrays of Trapezoidal-Tooth Log-Periodic Antennas via Genetic Optimization

“…Although they have been known for about five decades [1][2][3][4][5], logperiodic (LP) antennas are still interesting [6,7] due to their ability to display quasi-frequency-independent characteristics over a wide band of frequencies. The broadband capability of these antennas has attracted the interest of many researchers.…”