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There are two other ways to create and load DVB project files: Type VBAIDE at the AutoCAD command prompt or press Alt+F11 to open or create a DVB project file. Type VBALOAD at the AutoCAD command prompt to open the Open VBA Project dialog box so you can choose a project to load. To save your project, choose File Save or press Ctrl+S. If you have not previously saved your project, the standard Save As dialog box appears, as shown in Figure 1-16.

Further details will be found at www.ansoft.com/news/articles/ ICEAA2001.pdf. 6.21 Array Switching Switching of the phasing elements in the antenna arrays is usually carried out digitally. (There are analog phase shifters, some employing ferrite materials, which offer continuously variable phase change, but

Geometry of a basic microstrip reflectarray er, d Example of a 28 GHz microstrip reflectarray (using variable size patches)

30 40 30 20 10

28 GHz, 6" square aperture, 784 elements (variable size patches), 25 degree scan angle, corrugated conical horn feed, G = 31 dB, 51% aperture efficiency

Figure 6.38 An 784 element reflectarray. (Courtesy of D.M. Pozar. Source: www.ecs. umass.edu/ece/pozar/jina.ppt)

It also needs to import huge quantities of petroleum In addition, there are many commodities that the US could produce domestically but only at a relatively higher cost than the costs of some foreign countries Thus, trade is very important to the welfare of the US Solved Problem 102 a Cite some of the speci c arguments advanced in favor of trade protection b Evaluate these arguments Solution: a Protection is often advocated to protect domestic labor against cheap foreign labor That is, since wages are generally higher in the US than in other nations, without protection foreign nations can undersell the US because of the lower wages Another argument for protection is that it reduces domestic unemployment By restricting imports, domestic production is stimulated and unemployment is reduced A third argument in favor of protection is the infant industry argument.

Figure 6.39 A 2832 element 19 GHz ferroelectric reflectarray concept. The callout shows a 16 element subarray patterned on a 3.1 3.1 cm, 0.25 mm thick MgO substrate. The array diameter is 48.5 cm. The unit cell area is 0.604 cm2 and the estimated boresight gain is 39 dB. (Courtesy of Robert R. Romanofsky, NASA Glenn Research Center, Cleveland Ohio. Source: gltrs.grc.nasa.gov/reports/2000/TM-2000-210063.pdf)

CHAPTER 1 THE VBA INTEGRATED DEVELOPMENT ENVIRONMENT (VBAIDE)

these are not considered here). The digitally switched delay line type offers faster switching speed which is an important consideration where beam scanning is employed. The phase shift increments are determined by successive division by 2 of 360 . These would follow the pattern 180 , 90 , 45 , 22.5 , 12.25 , and so on. Thus a 4-bit phase shifter would have 24 16 states, providing increments of 180 , 90 , 45 , 22.5 . This is another limitation of digitally switched phase shifters, the resolution that can be achieved. One manufacturer (KDI Triangle Corp. states that 5.63 is the practical limit for digital, compared to 0.088 for analog types). The arrangement for a 4-bit phase shifter is shown in Fig. 6.41a. It is seen that four control lines are required, one for each logical bit. The most significant bit (MSB) switches in the 180 phase shift, and the least significant bit (LSB) the 22.5 , and if all four lines

W (top view)

+ (side view)

0.58l

Phase shift using varactor diodes. (Courtesy of L. Boccia. Source: www.ansoft.com/news/articles/ICEAA2001.pdf )

This states that a newly established industry requires protection until it can grow in size and ef ciency so as to be able to face foreign competition Finally, protection is advocated in order to protect such industries as shipyards that are important for national defense b The argument for protection against cheap foreign labor is generally invalid because it incorrectly implies that higher wages necessarily mean higher labor costs This is not true if the higher US wages are based on even higher labor productivity Restrictions on US imports to reduce US unemployment is a beggar-thy-neighbor policy because it leads to higher unemployment in those nations whose exports to the US have.