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For the past fifty years the Antenna Applications Symposium at Allerton has provided a podium for engineers to discuss all aspects of antenna engineering . This paper addresses the subject of phased array development, and catalogs some of the papers presented at Allerton that have contributed to this development.The Antenna Applications Symposium at Allerton has played a significant role in phased array development. From the time of its beginnings as the Air Force Antenna Symposium, Allerton has always offered two venues for communication, one is from the podium, and a second one takes place throughout the grounds and in the hallways and the dining area. To some this second venue may be the more valuable, but it has gone unrecorded. There is a fairly complete record of the presented papers and I have tried to highlight some of those that seem more relevant to phased array developments. This paper looks at the role played by the symposium in fostering those developments in array technology. Table 1 gives a chronology of some representative array systems or major testbeds, along with component developments that support these systems. The various items of technology highlighted are array elements, control devices and array architectures. These major topics and subtopics are referenced against specific Allerton paper references in the Appendix, which lists the principle author and a few words to describe the subject.There are some interesting trends revealed in the system applications and the items of technology. Throughout the 60's and 70's all array system applications used dipole and waveguide elements. Ferrite phase shifters controlled radars at Sband and above. Included are AWACS and AEGIS at S-band and the Patriot ground radar at C-band, the TPN-25 PAR antenna and GPN-22 at x-band. Array ElementsDuring the 60's and 70's most of the basic new array elements now in use were

Abstrucr-Past and present technological developments in microstrip antenna arrays are summarized. Emphasis is on exploring the potential of such arrays for satisfying the requirements of advanced military and commercial applications.

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This paper presents new results showing the application of polyomino-based subarrays to limited field of view and wideband, wide-angle scanning. This technology can reduce the number of phase controls in arrays used for limited sector coverage or the number of time delay devices for wideband radar or communications, and so can reduce the cost of space-based active arrays. We concentrate on the wideband application. Results are presented by comparing the gain and peak sidelobe results of irregular polyomino subarray-based arrays with those of rectangular subarrays. It is shown that using irregular polyomino subarrays can result in a major decrease in sidelobes while presenting, in most cases, only a few tenths of a dB gain reduction compared to rectangular subarrays.

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