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Miniature 1.9GHz Printed Monopole Antenna with Integrated Transformer

The required form factor only allowed for a low impedance antenna. To provide for a wideband match to the system impedance, a printed transformer was made part of the design (on the inner layers).

5.8GHz Printed Monopole Antenna

This is an example printed monopole antenna

The folded end provides for a smaller form factor (due to the physical folding and due to the additional capacitance created by having the end closer and more parallel to the ground plane).