Selecting The Best Ultra Wideband Antennas For Particular Military Applications-queer as folk

Satellite-TV Ultra wideband antennas are an increasingly important part of military tactical .munications and information warfare. Time non-dispersive ultra wideband antennas can transmit and receive ultra wideband (impulse type) signals. This makes ultra wideband antennas future-proof against emerging signal technologies. Furthermore, ultra wideband antennas can transmit or receive across the full spectrum of narrowband frequencies of interest, such that the entire frequency range can be covered via a single antenna. The latter (the ability to transmit or receive throughout the entire frequency range, via a single ultra wideband antenna ) is highly advantageous for military operations. It enables minimizing the space and weight required on the platform, simplifies system integration/upgrade/maintenance, and reduces the platforms visual and radar signature. Ultra wideband antennas which are also very lightweight can be highly advantageous for weight sensitive platforms and applications, such as man-portable, team-transportable and unmanned aerial vehicles (UAVs). Although in the past antennas have been a limiting factor for system performance, that is no longer the case with todays ultra wideband antennas, which enable high-performance transmit and receive of a wide variety of signals. Selecting Ultra Wideband Antennas for Information Warfare Applications Information warfare is based on 3 primary activities: signals intelligence (SIGINT), direction-finding (DF) and electronic attack (EA). Ultra wideband antennas can be used for each of these applications. In the case of signals intelligence (SIGINT), which is monitoring the environment for signals of interest and collecting the signal information, ultra wideband time non-dispersive antennas enable the end user to cover all frequencies and all bandwidths. Covering (transmitting and receiving signals over) all azimuth angles all the time would require omnidirectional ultra wideband time non-dispersive antennas, while covering only a particular sector would require directional ultra wideband time non-dispersive antennas. In the case of direction-finding (DF), which is determining the direction that the signal of interest is .ing from, an ultra wideband time non-dispersive antenna enables the end user to cover all frequencies and all bandwidths. Transmitting and receiving over all azimuth angles all the time requires circular arrays of time non-dispersive ultra wideband antennas. Transmitting and receiving over one sector at a time requires scanning directional time non-dispersive ultra wideband antennas. In the case of electronic attack (EA), which is jamming the adversary signal, an ultra wideband time non-dispersive antenna enables the end user to cover all frequencies and all bandwidths. Transmitting and receiving over all azimuth angles all the time requires circular arrays of time non-dispersive ultra wideband antennas. Transmitting and receiving over one sector at a time requires directional time non-dispersive ultra wideband antennas. Ultra Wideband Antenna Selection for Tactical .munications Selecting an ultra wideband antenna for tactical .munications is primarily based on the available space (height and diameter) and maximum weight. A well designed ultra wideband antenna can achieve the maximum possible frequency range coverage within a given volume and weight. The low end of the frequency range is typically determined by the antenna height and the high end is typically determined by the connector type. The antennas frequency range is defined by the voltage standing wave ratio (VSWR) being < 3. With an ultra wideband antenna, the ratio of the high end frequency to the low end frequency is 10:1 or greater. Other areas to select are the polarization type (vertical linear polarization is typical for military antennas, particularly ultra wideband antennas for tactical .munications) and the radiation pattern type (omnidirectional or directional). Further information that may be of relevance in selecting an ultra wideband antenna includes the boresite gain at the minimum or maximum frequency, the minimum and/or maximum beamwidth, and the maximum VSWR requirement (if any). It may also be helpful to determine whether the antenna can be customized towards particular mounting/install requirements. About the Author: 相关的主题文章: