文档介绍：1?In certain applications, desired antenna characteristics may be achieved with a single microstrip element. ?However, as in the case of conventional microwave antennas, characteristics such as high gain, beam scanning, or steering capability are possible only when discrete radiators bined to form arrays. ?The elements of an array may be spatially distributed to form a linear, planar, or volume array. Chapter 4 Design and Analysis of Chapter 4 Design and Analysis of MicrostripMicrostripAntenna ArraysAntenna Introduction2The array has a bandwidth of approximately 600 MHz, is capable of high power operation and offers 30 dB of polarization isolation. prises three panels each having 64 elements, mounted in a lightweight frame suitable for use in the radomeof an -band Synthetic Aperture Radar ArrayConformal Array Antenna for Observation Platforms in Low Earth OrbitA conformal array antenna can provide the flexibility that platforms in low Earth-orbit need to download their data to ground stations. It does this by producing multiple beams for various ground ?In general, radiation characteristics of an array can be determined once the aperture distribution is known. The amplitude and phase distribution at each element is usually determined from the intended application, for example, low sidelobe and beam direction. ?The means of excitation of the radiating elements are thus an essential and important factor which must be carefully considered so that the required distribution is Parallel and Series Feed Parallel and Series Feed Systems4?Existing methods that have been employed to feed microstrip arrays can be categorized into parallel and series feeds, which refers to geometries rather than to actual equivalent circuits. ?The parallel or corporate feed has a single input port and multiple feed lines in constituting the output ports. Each of these feed lines is terminated at an individual radiating el