Surface mount antenna and antenna module

A surface mount antenna:

• comprising:
• a substrate including a dielectric material or a magnetic material as a main material,
• a feed radiation conductor formed on a surface of the substrate, one end of the feed radiation conductor being formed as a first feed end to be supplied with power, and the other end thereof being formed as a first open end, and
• a parasitic radiation conductor formed on the surface of the substrate at a distance from the feed radiation conductor, one end of the parasitic radiation conductor being formed as a second feed end to be supplied with power from the feed radiation conductor through an action of electromagnetic coupling, and the other end thereof being formed as a second open end,
• wherein
• a region having a dielectric constant lower than that of the main material of the substrate or having a magnetic permeability lower than that of the main material of the substrate is provided between the feed radiation conductor and the parasitic radiation conductor,
• the substrate has a rectangular solid shape with a first surface, a second surface perpendicular to the first surface and a third surface opposed to the first surface,
• the feed radiation conductor and the parasitic radiation conductor are formed in parallel with each other to extend around the substrate along the first, the second and the third surfaces,
• the first open end of the feed radiation conductor and the second open end of the parasitic radiation conductor are located on the third surface of the substrate,
• a width, at least at the first open end, of the feed radiation conductor on the third surface is larger than a width of the feed radiation conductor on the other surfaces, and
• a width, at least at the second open end, of the parasitic radiation conductor on the third surface is larger than a width of the parasitic radiation conductor on the other surfaces.

An antenna module configured by mounting a surface mount antenna on a circuit board:

• wherein
• the surface mount antenna includes
• a substrate including a dielectric material or a magnetic material as a main material,
• a feed radiation conductor formed on a surface of the substrate, one end of the feed radiation conductor being supplied with power, and the other end being formed as an open end, and
• a parasitic radiation conductor formed on the surface of the substrate at a distance from the feed radiation conductor, one end of the parasitic radiation conductor being supplied with power from the feed radiation conductor through an action of electromagnetic coupling, and the other end being formed as an open end,
• wherein
• a region having a dielectric constant lower than that of the main material of the substrate or having a magnetic permeability lower than that of the main material of the substrate is provided between the feed radiation conductor and the parasitic radiation conductor,
• the substrate has a rectangular solid shape with a first surface, a second surface perpendicular to the first surface and a third surface opposed to the first surface,
• the feed radiation conductor and the parasitic radiation conductor are formed in parallel with each other to extend around the substrate along the first, the second and the third surfaces,
• the first open end of the feed radiation conductor and the second open end of the parasitic radiation conductor are located on the third surface of the substrate,
• a width, at least at the first open end, of the feed radiation conductor on the third surface is larger than a width of the feed radiation conductor on the other surfaces, and
• a width, at least at the second open end, of the parasitic radiation conductor on the third surface is larger than a width of the parasitic radiation conductor on the other surfaces.