Issue 4 • Date Dec. 2000
Author IndexPage(s): 116 - 117| | PDF (82 KB)
Subject indexPage(s): 117 - 120| | PDF (127 KB)
It is well known that an active phased array (APA) payload has the potential to overcome the flexibility limitations associated with conventional communications satellites. This article discusses the benefits and design drivers associated with APAs and features a deployed APA antenna architecture for multiple-beam applications that is modular in construction and programmable in performance. This architecture applies to both receive and transmit arrays. Some of the critical hardware that has been developed in support of this architecture is described. The article focuses on transmit APAs, as they tend to be more technologically challenging than receive APAs. Transmit APAs also tend to drive the spacecraft design more heavily than receive APAs View full abstract»
Microstrip conductor loss exhibits complicated behavior that is not generally recognized. Specifically, there are three frequency ranges of interest. At low frequency, current is uniform through the entire cross-section of the line, and the line behaves like a resistor. At medium frequency, the edge singularity forms. In this case, current concentrates on the edge of the line, increasing the resistance. At high frequency, the current splits into two sheets of current, one on top of the line, the other on the bottom of the line. Since microstrip dispersion causes the edge singularity to become larger and current to concentrate on the bottom side as frequency increases, the total resistance increases faster than the normally expected square root of frequency View full abstract»
This article surveys recent progress in the development of high-power microwave and millimeter-wave solid-state sources using spatial power-combining techniques. Several promising topologies are discussed, and four technology demonstrations are presented that have emerged from recent research in academia and industry. We also include a brief discussion of potential applications and systems insertion issues View full abstract»
Aims & Scope
IEEE Microwave Magazine is intended to serve primarily as a source of information of interest to professionals in the field of microwave theory and techniques.
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