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Antenna Theory - Analysis and Design by C. Balanis [SOLUTIONS] [non-OCR]

By C. Balanis [SOLUTIONS] [non-OCR]

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D.... '" .... E3 '" [±) ttl . [] .. .. [ 9 [J (f] 01 C1 . [±J .. 21 Land pattern principal dimensions. g. TAB. Consequently, fully understanding and adequately defining and determining the thermal requirements of the TAB package are essential, [21,26-27,37-38,40,84,125-127,137,179,201, 295, 301-302]. 1 Thermoelastlcity for electronics packaging. 22 Fan-out on level. [238-242] material) subjected to heating and external forces. We assume that the package is stress-free at a uniform temperature To when all external forces are removed.

LAU ET AL ~L::7~~L::7L:::7:~ I. 6 million gates. [301-302] interfaces. Care must be taken during chip processing to eliminate contaminants and other causes of poor adhesion. * Beam-to-Bump Separation: Control of beam-to-bump separation requires clean Au/Au or Au/Sn interfaces and the use of suitable ILB parameters such as those previously noted. * Beam-to-Substrate Separation: This can occur at the beam-tofilm interface, at an intrafilm (Au-Pd or Pd-Ti) interface, or at the film-to-ceramic interface.

Before the solder reaches this temperature, the pulse is removed, the solder has reflowed and the thermode begins to cool back down to 1S0'C and is lifted from the component. 24 [125-127]. It can be seen that precision feed mechanisms advance both tape and lead frame (A). During the punch and bond sequence (B) an accurately fitted punch with a spring-loaded pressure pad cuts the device and its leads from the tape and carries it up through the die plate until it contacts the lead frame. The thermode simultaneously drops and applies heat and pressure to form the bond J.

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