The Log-Periodic Antenna is designed to familiarize students with the principles of frequency independent antennas. Although the nominal frequency range of the Log-Periodic Antenna is 700 to 4350 MHz, it can be operated from 700 to 1200 MHz when used with the ATMS (by tuning the frequency of the ATMS 1-GHz RF Generator). The antenna can be mounted to the ATMS Antenna Positioner for either vertical or horizontal polarization. For full flexibility in experimenting with this antenna, it is recommended that two be used, one to transmit and one to receive.
Multi-Beam Array Antenna
(Phased Array intro')
The Multi-Beam Array Antenna (MBAA) is designed to operate in the X frequency band (8 to 12.5 GHz) and provides students with training in phased array antenna theory. It allows hands-on experimentation in advanced antenna principles used in the fields of radar imagery as well as satellite and space-diversity communication systems.
The MBAA uses a microstrip Rotman lens to modify the phase shifts to a linear array of radiating elements. The antenna beam can be steered to various discrete directions by manually switching the connection to one of the MBAA RF port connectors. The MBAA can also be operated with multiple beams (2) by using the included power combiner. The MBAA is mechanically designed to provide easy installation on the ATMS Antenna Positioner. The student manual included with the MBAA deals with the multi-beam array antenna theory and design, antenna beam characteristics, and beam combination effects.
Two Element Phasing Kit
The Two Element Phasing Kit enables students to observe the effects of antenna phasing on the resulting antenna radiation pattern (combined radiation pattern). Different combined radiation patterns such as end-fire, broadside, and cardioid can be obtained. These can be measured, stored, and analyzed using the ATMS.
The Two Element Phasing Kit consists of an additional drooping monopole antenna (one is already included in the ATMS), an additional antenna mast with vertical mounting clips (one is already included in the ATMS), a power splitter/combiner, and a set of RF cables of different lengths. Phase shifts of 0, 90, and 180 degrees can be produced with the supplied RF cables. Other phase shifts can be produced by using RF cables having lengths that differ from those of the supplied RF cables.
Radar Cross Section (RCS)
The Radar Cross Section (RSC) Demonstration Add-On is used in conjunction with the Antenna Training and Measurement System (Model 8092) to allow observation of the near-field and far-field relative radar cross-section of targets. The RCS kit can be used for both quasi-monostatic and bistatic RCS measurements.
The system is comprised of a modified Lab-Volt Antenna Positioner, an additional 2-meter RF cable, a 20 x 20 cm flat plate and a metallic prism target.
RCS patterns of different targets are acquired, displayed, and stored using LVDAM-ANT software. Trainees can observe the RCS of different target forms such as flat plates, cylinders, and complex objects.