If a voltage is applied to the terminals of an antenna A and the current is measured at the terminals of another antenna B, then an equal current (in both amplitude and phase) will appear at the terminals of A if the same voltage is applied to B.
Ref:http://www.cv.nrao.edu/course/astr534/AntennaTheory.html
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The various forms of the reciprocity theorem find application in electric circuits, network and system analysis.
an antenna that is able to be formed, or bent
You can replace an XM radio antenna with a CB antenna, a ham 40-meter mobile antenna, a cellphone antenna, a GPS antenna, a TV antenna, a wire coat hanger, a 6 GHz microwave antenna, or a chain of paperclips. However, since none of them is optimized to operate at the frequencies of XM radio, like the XM antenna is, none of the others will work as well. Most of them will likely be so inefficient at the satellite radio frequencies that when you use one of those, you hear nothing at all on your radio.
microstip patch array antenna is basically ,thecollection of antenna that give the double directive gain
yes
thevenins theorem is applicable to network which is linear ,bilateral