Low cost compact omini-directional printed antenna

A compact printed slot antenna comprising:

• a printed circuit board;
• a ground plane patterned on one surface of the circuit board;
• a first wound slot element patterned in the ground plane to have a general curved configuration and having a first resonant frequency;
• a first microstrip antenna feed patterned on a surface of the circuit board opposite from the ground plane, said first antenna feed including a first shorting via extending through the circuit board and being shorted to the ground plane proximate an outer end of the first slot element;
• a second wound slot element patterned in the ground plane to have a general curved configuration following the general contour of the first slot element, said second slot element having a second resonant frequency;
• and
• a second microstrip antenna feed patterned on the surface of the printed circuit opposite to the ground plane, said second feed including a second shorting via extending through the circuit board and being shorted to the ground plane proximate an outer end of the second slot element, wherein the resonant frequencies of the first and second slot elements are different and are coupled together to provide a wider bandwidth than the first and second slot elements alone.

A compact integrated multi-function printed slot antenna for providing simultaneous satellite and terrestrial operations, said antenna comprising:

• a printed circuit board;
• a ground plane patterned on one surface of the printed circuit board;
• a first wound slot element patterned in the ground plane to have a general curved configuration;
• a second wound slot element patterned in the ground plane to have a general curved configuration following the general contour of the first slot element;
• a first antenna feed connected to the ground plane proximate the first and second slot elements;
• a circularly polarized spiral slot antenna element patterned in the ground plane adjacent to the first and second wound slot elements;
• and
• a second antenna feed connected to the ground plane an appropriate distance and having a relative orientation to the first and second slot elements to minimize interference and maximize signal isolation between the elements.

A compact printed slot antenna comprising:

• a printed circuit board;
• a ground plane patterned on one surface of the circuit board;
• a first wound slot element patterned in the ground plane to have a general curved configuration and having a first resonant frequency;
• a first co-planar waveguide network for feeding the first wound slot element, said first co-planar waveguide network being patterned on the same surface of the circuit board as the ground plane;
• a second wound slot element patterned in the ground plane to have a general curved configuration following the general contour of the first slot element, said second slot element having a second resonant frequency;
• and
• a second co-planar waveguide network for feeding the second would slot element, said second co-planar waveguide network being patterned on the same surface of the circuit board as the ground plane, wherein the resonant frequencies of the first and second slot elements are different and are coupled together to provide a wider bandwidth than the first and second slot elements alone.