Patent ID: 9692133
Date: 2017-06-27
CPC Classifications: H01Q

Claim:
1. An antenna comprising: a feeder including a feeder ground and a power source connected to the feeder ground; a first element connected to the feeder ground and having a predetermined area, the first element being on the same plane as a circuit ground of a wireless circuit and electrically isolated from the circuit ground; a second element having a first end connected to the first element and a second end as an open end, the second element being on the same plane as the circuit ground and having a predetermined electrical length; a third element having a first end connected to the power source of the feeder, the third element located in a region occupied by the first element and substantially perpendicular to the first element in such a manner that the first end connected to the power source faces down, the third element having a predetermined height, and a fourth element having a first end connected to a second end of the third element and a second end as an open end, the fourth element being substantially parallel to the first element and substantially perpendicular to a line connecting the first end of the second element connected to the first element to the second end of the second element; wherein the area of the first element is equal to or greater than an area of a circle whose radius is equal to the height of the third element; and a sum of the electrical lengths of the second element, the third element, and the fourth element is equal to ½ of a wavelength of a radio wave to be transmitted and received.