No abstract

An experimental analysis of the bulk polymerization of styrene initiated by azobisisobutyronitrile was carried out in a tubular reactor. The experiments performed in a 2.362‐cm I.D., 6‐meter long jacketed reactor showed that: (1) it was feasible for a tubular reactor to produce acceptable quality polystyrene for industrial purposes; (2) the quality of the polymer product was reproducible at any time; (3) it was technically feasible for the tubular reactor to replace the stirred‐batch kettles as the preliminary stage in the polystyrene manufacturing process, and (4) radial temperature gradients were not a problem for reactor operation.

This research proposes the use of a quad-slotted ground plane in enhancing the bandwidth of rectangular patch microstrip antenna. A feeding line is used for exciting the antenna patch. On the ground plane, there are 4 slots which are designed in a rectangular form with the same dimension. Each slot has a height of 22.5 mm and a width of 15.4 mm. The antenna is designed on FR4 epoxy which has a dielectric constant of 4.4 and a thickness of 1.67 mm. The result shows that the return loss of -14.51 dB in the operating frequency of 1,810 MHz in the LTE Band 3 Frequency, VSWR is 2.19 and the gain is 3.2 dBi. The achieved bandwidth of 200 MHz can cover the frequency range of the LTE Band 3.

No abstract