The company also highlighted its latest antenna offering-- the AT700M12G wideband trapezoidal log-periodic antenna
(Figure 1), which operates from 700 MHz to 11 GHz.
The University wishes to appoint a design company to develop the mechanical design of a log-periodic antenna
sub-system covering 50-650MHz for the low frequency aperture array element of the Square Kilometre Array, SKA, radio telescope.
Chang, "Application of quasi log-periodic antenna
for UHF passive RFID tag design featuring constant power transmission coefficient over broadband operation," Journal of Electromagnetic Waves and Applications, Vol.
The lower frequency band uses a biconical antenna while the higher frequency band uses a log-periodic antenna
(although the range from 30 to 1000 MHz can also be handled with a single broadband antenna).
The company also will highlight its latest antenna offering--the AT700M12G wideband trapezoidal log-periodic antenna
(Figure 2), which operates from 700 MHz to 11 GHz.
And it determines the polarization direction of the log-periodic antenna
composed of the treelike fractal dipole is also in y direction.
The measurements were performed with a generator, broadband amplifier, log-periodic antenna
and electric field meter, as shown in Figure 8.
The log-periodic part of the AC-220 is 37" long x 22" wide, approximately the same size as the company's Model AL-100, a log-periodic antenna
covering 300 MHz to 1 GHz.
The lowest and highest frequency of operation are given by the largest and smallest teeth defined in the log-periodic antenna
The FCC recommends a log-periodic antenna
below 960 MHz although other types of measurement antennas such as biconicals may be used.
The patent-pending Radiant Arrow 80 Log-Periodic Antenna
covers the 80-MHz to 5.
It describes the theory of thin antennas, the integral equation method, folded antennas of metal wires, multi-folded and multi-level antennas, antennas with concentrated loads, the synthesis of directional radiators, the methods of a complex potential for cylindrical problems and three-dimensional problems, the principle of complementarities, problems of compensation and adjustment, arrays, transparent antennas, ship antennas, log-periodic antennas
, and other issues, such as antennas for underground radio communication and observation and magnetic impedance antennas.