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Curtain arrays were originally developed during the 1920s and 1930s when there was a lot of experimentation with long distance shortwave broadcasting. The underlying concept was to achieve improvements in gain and/or directionality over the simple dipole antenna, possibly by folding one or more dipoles into a smaller physical space, or to arrange multiple dipoles such that their radiation ...
RDUs are mobile radio base stations transportable on trucks. Their use is strategic for the rapid expansion of cellular networks. A rapid deployment flanged pole is a mobile radio base station infrastructure transportable on a truck allowing fast and easy installation in restricted spaces. The antenna supporting pole, with a climbing ladder up to the summit, is fixed to the main base frame and i
Small-loop receiving antennas are also almost always resonated using a parallel-plate capacitor, which makes their reception narrow-band, sensitive only to a very specific frequency. This allows the antenna, in conjunction with a (variable) tuning capacitor, to act as a tuned input stage to the receiver's front-end, in lieu of a preselector.
The RP-23 Sapfir (NATO codename: High Lark) was a Soviet look-down/shoot-down radar system. It was developed by Phazotron specifically for the Soviet Air Forces (VVS) new MiG-23 fighter aircraft and used in conjunction with the Vympel R-23 (NATO codename: AA-7 Apex) beyond visual range air-to-air missile.
A 20-meter-long T²FD antenna, covering the 5-30 MHz band. The T ilted T erminated F olded D ipole ( T²FD , T2FD , or TTFD ) or B alanced T ermination, F olded D ipole ( BTFD ) - also known as W3HH antenna - is a general-purpose shortwave antenna developed in the late 1940s by the United States Navy .
30 VTLM + 30 VTLM not armored, for 16.8 million Euros, ordered in 2003; 1,153 VTLM, for 335 million Euros, ordered in 2004, for deliver in July 2011 (81 with Hitrole Light) in 2007 ordered update of 32 VTLM, to transform in Spike missile launcher, for 3.9 million Euros; 35 VTLM tactical ambulance, ordered in 2006/2007, for 19.9 million Euros [118]
This makes computational electromagnetics (CEM) important to the design, and modeling of antenna, radar, satellite and other communication systems, nanophotonic devices and high speed silicon electronics, medical imaging, cell-phone antenna design, among other applications.
An antenna like effect is achieved by periodic swing of electrons from its capacitive element to the ground plane which behaves like an inductor. The authors further argued that the operation of a dielectric antenna resembles the antenna conceived by Marconi, the only difference is that inductive element is replaced by the dielectric material. [5]
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