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A conventional planar two-arm balanced-mode Archimedean spiral antenna has an impedance close to 170 Ω (theoretically 188 Ω) and needs a balun to be fed with a 50 Ω line. The proposed novel modified Archimedean spiral antenna achieves a simple feed without balun by maintaining the antenna input impedance close to 50 Ω over 10∶1 frequency band. It shows excellent impedance matching, higher peak gain...
It has previously been shown that radiation efficiency and input reflection coefficient S11fs of small antennas in free space can be obtained from measurements in reverberation chamber. The S11fs is obtained by so-called complex stirring of the S11 measured when the antenna is in the chamber. In the present paper it is shown that the accuracy of S11fs can be very good even for larger directive...
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