Multi-band or wide-band antenna including driven and parasitic top-loading elements

An antenna for multi- or wide-band use to transmit or receive radio frequency electromagnetic energy, comprising:

• feed point means for receiving the energy into the antenna or to provide the energy from the antenna;
• driven radiating means including:
• first top-loading means for producing a first resonance mode, and feed conducting means for electrically connecting said feed point means to said first top-loading means, wherein said driven radiating means is not electrically connected to a grounding means;
• and
• a parasitic radiating means including:
• second top-loading means for producing a second resonance mode, and bridge conductive means for electrically connecting said second top-loading means to said grounding means, wherein:
• said second top-loading means includes a flat plate defining a slot:
• and
• said first top-loading means is positioned within said slot.

An antenna for multi- or wide-band use to transmit or receive radio frequency electromagnetic energy, comprising:

• a feed point operational to receive energy into the antenna or to transmit the energy from the antenna;
• a driven radiating section including a first flat plate a feed conductor that electrically connects said feed point to said first flat plate, wherein said driven radiating section is not electrically connected to a grounding surface;
• and
• a parasitic radiating section including a second flat plate that is coplanar with respect to the first flat plate, the parasitic radiating section having a notch sized to receive the first flat plate and a conductor that electrically connects said second flat plate to said grounding surface.