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The experimental set
up is shown above, where a limited ground size is simulated with a brass
block measuring 20 x 20 x 6 mm (i.e. length, width and depth). The gain
of this antenna was measured at -15dBi. To investigate the gain improvement
of this antenna system, a tuned parasitic radiator measuring 22 x 22 mm
is placed above the feed antenna at distance of 0.5 to 8 mm. The parasite
is truncated at 2 vertex point with d = 5 mm.
Circular parasitic polarisation can also be achieved from the truncation of the parasite antenna. A small credit card size RF link consisting of a transmitter unit with a 6GHz oscillator and a receiver unit was built using this concept.
