Surface-mounted antenna, method for adjusting and setting dual-resonance frequency thereof, and communication device including the surface-mounted type antenna

A surface-mounted type antenna comprising:

• a dielectric substrate;
• a first radiation electrode to which power is supplied disposed of + on a top surface of said dielectric substrate;
• a second radiation electrode to which power is not directly supplied which is disposed adjacent to said first radiation electrode on said dielectric substrate with a space therebetween;
• strong electric-field regions of said first radiation electrode and the second radiation electrode wherein electric fields of these radiation electrodes are each the strongest, being disposed adjacent to each other with a spacing therebetween;
• high current regions of said first radiation electrode and said second radiation electrode wherein currents of these radiation electrodes are each the highest, being disposed adjacent to each other with a spacing therebetween;
• and
• said space between said first radiation electrode and said second radiation electrode diverging from said high current regions to said strong electric-field regions.

A communication device comprising:

• a surface-mounted type antenna produced by adjusting and setting a dual-resonance frequency in accordance with a method for adjusting and setting a dual-resonance frequency of a surface-mounted type antenna, the surface-mounted type antenna comprising:
• a dielectric substrate;
• a first radiation electrode to which power is supplied disposed on a top surface of said dielectric substrate;
• a second radiation electrode to which power is not directly supplied which is disposed adjacent to said first radiation electrode on said dielectric substrate with a space therebetween;
• strong electric-field regions of said first radiation electrode and the second radiation electrode wherein electric fields of these radiation electrodes are each the strongest, being disposed adjacent to each other with a spacing therebetween;
• high current regions of said first radiation electrode and said second radiation electrode wherein currents of these radiation electrodes are each the highest, being disposed adjacent to each other with a spacing therebetween;
• and
• said space between said first radiation electrode and said second radiation electrode diverging from said high current regions to said strong electric-field regions;
• the method comprising:
• arranging said first radiation electrode and said second radiation electrode so that strong electric-field regions of said first radiation electrode and said second radiation electrode wherein electric fields of these radiation electrodes are each the strongest, are adjacent to each other, and so that the strong electric-field regions of these radiation electrodes thereby come into an electric-field coupling;
• simultaneously arranging said first radiation electrode and said second radiation electrode so that high current regions of said first radiation electrode and said second radiation electrode wherein the currents of these radiation electrodes are each the highest, are adjacent to each other, and so that the high current regions of these radiation electrodes thereby come into a magnetic-field coupling;
• variably adjusting each of the electric-field coupling between the strong electric-field regions of said first radiation electrode and said second radiation electrode, and the magnetic-field coupling between the high current regions of said first radiation electrode and said second radiation electrode;
• and
• setting a reflection loss in the dual resonance of said first radiation electrode and said second radiation electrode to a value not higher than a predetermined value within the range of a set frequency, by adjusting both the electric-field coupling and the magnetic-field coupling.