Download PDF by R. C. Majam-Majumdar: Classical Accounts of India: Rome, Greek
By R. C. Majam-Majumdar
ISBN-10: 0836407040
ISBN-13: 9780836407044
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Sample text
Little if any serious articles have been published in the amateur radio literature. Therefore it was decided to write this article including the description of the most interesting microwave cavity antennas, their past experience, present performance 26 Chapter 1: Antennas and expected future developments. 2Mbps packet radio access. Unfortunately, most people select an antenna only according to its directivity or gain. WRO NG! There are many more selectio n paramete rs and all of them need to be considered: width and-shape of the main beam , side lobe levels and directions , frequency bandwidth , sensitivity to environ mental conditions and weather effects, ease of manufacturing etc.
Pl ~rt e SMA The quarter-wave impedance transformer is made from an FR-4 substrate symmetrical microst rip {see footnote 2}. 7D. The upper end of the quarter-wave section is soldered to the feed line. 75mm wide 50D section to the SMA connecto r. The conductor on one side of the 50D section is soldered to the pin of the SMA connector and other side is soldered to the ground. Note that the feed point B is connected to the ground thfough the matching network. c/4 long, so the impedance from B to ground would be infinite if there were no radiation .
An SMA connector is attached to the center of the FR-4 panel and serves as the input for the antenna. We will suppose it is a transmitting antenna but, because of the reciprocity property, most of the conclusions will also apply when the antenna is receiving. " Although the antenna array appears deceptively simple in principle, several practical ' and theoretical problems must be solved before we have an operational antenna. Because "God is in the details", let us briefly examine the theoretical principles of an antenna array.
Classical Accounts of India: Rome, Greek by R. C. Majam-Majumdar
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