Deformed folded dipole antenna, method of controlling impedance of the same, and antenna device including the same

A method of controlling an impedance of a deformed folded dipole antenna, the deformed folded dipole antenna including

• a first parallel section and a second parallel section made of a conductive material, the first parallel section arranged along a first plane and the second parallel section arranged along a second plane parallel with the first plane, a width of the first parallel section is within the first plane and is greater than a thickness of the first parallel section which is within a plane perpendicular to the first plane, and a width of the second parallel section is within the second plane and is greater than a thickness of the second parallel section which is within a plane perpendicular to the second plane, and
• two short sections made of a conductive material, each of the short sections being shorter than the first parallel section and the second parallel section, each of the short sections coupling an end of the first parallel section with a corresponding end of the second parallel section, wherein:
• the second parallel section has a U-shape including a first opposing side portion, a second opposing side portion, and a connecting side portion;
• the first opposing side portion and the second opposing side portion are opposed to each other and the connecting side portion couples an end of the first opposing side portion with an end of the second opposing side portion;
• the first parallel section has a cut U-shape including a first L-shape section and a second L-shape section;
• the first L-shape section includes a portion arranged in parallel with the first opposing side portion and a portion arranged in parallel with a part of the connecting side portion;
• the second L-shape section includes a portion arranged in parallel with the second opposing side portion and a portion arranged in parallel with another part of the connecting side portion;
• the first L-shape section has a feeding point at an end of the portion arranged in parallel with the connecting side portion;
• the second L-shape section has a feeding point at an end of the portion arranged in parallel with the connecting side portion;
• the portion of the first L-shape section arranged in parallel with the connecting side portion is arranged in a same straight line with the portion of the second L-shape section arranged in parallel with the connecting side portion;
• the end of the first L-shape section is opposed to the end of the second L-shape section at a distance;
• the portion of the first L-shape section arranged in parallel with the first opposing side portion and the portion of the second L-shape section arranged in parallel with the second opposing side portion with a width W1 in a first direction along the first plane;
• the portion of the first L-shape section arranged in parallel with the connecting side portion and the portion of the second L-shape section arranged in parallel with the connecting side portion have a width W2 in a second direction along the first plane;
• the first opposing side portion and the second opposing side portion have a width W3 in the first direction along the second plane;
• and
• the connecting side portion has a width W4 in the second direction along the second plane,
• the method of controlling the impedance comprising setting the width W4 to be larger than the widths W1-W3, wherein when the width W4 is greater than the width W2, the impedance is lower than when the width W4 is less than or equal to the width W2.

A method of controlling an impedance of a deformed folded dipole antenna, the deformed folded dipole antenna including

• a first parallel section and a second parallel section made of a conductive material, the first parallel section arranged along a first plane and the second parallel section arranged along a second plane parallel with the first plane, a width of the first parallel section is within the first plane and is greater than a thickness of the first parallel section which is within a plane perpendicular to the first plane, and a width of the second parallel section is within the second plane and is greater than a thickness of the second parallel section which is within a plane perpendicular to the second plane, and
• two short sections made of a conductive material, each of the short sections being shorter than the first parallel section and the second parallel section, each of the short sections coupling an end of the first parallel section with a corresponding end of the second parallel section, wherein:
• the second parallel section has a U-shape including a first opposing side portion, a second opposing side portion, and a connecting side portion;
• the first opposing side portion and the second opposing side portion are opposed to each other and the connecting side portion couples an end of the first opposing side portion with an end of the second opposing side portion;
• the first parallel section has a cut U-shape including a first L-shape section and a second L-shape section;
• the first L-shape section includes a portion arranged in parallel with the first opposing side portion and a portion arranged in parallel with a part of the connecting side portion;
• the second L-shape section includes a portion arranged in parallel with the second opposing side portion and a portion arranged in parallel with another part of the connecting side portion;
• the first L-shape section has a feeding point at an end of the portion arranged in parallel with the connecting side portion;
• the second L-shape section has a feeding point at an end of the portion arranged in parallel with the connecting side portion;
• the portion of the first L-shape section arranged in parallel with the connecting side portion is arranged in a same straight line with the portion of the second L-shape section arranged in parallel with the connecting side portion;
• the end of the first L-shape section is opposed to the end of the second L-shape section at a distance;
• the portion of the first L-shape section arranged in parallel with the first opposing side portion and the portion of the second L-shape section arranged in parallel with the second opposing side portion have a width W1 in a first direction along the first plane;
• the portion of the first L-shape section arranged in parallel with the connecting side portion and the portion of the second L-shape section arranged in parallel with the connecting side portion have a width W2 in a second direction along the first plane;
• the first opposing side portion and the second opposing side portion have a width W3 in the first direction along the second plane;
• and
• the connecting side portion has a width W4 in the second direction along the second plane,
• the method of controlling the impedance comprising controlling a ratio of the width W2 with respect to the width W4 in a state where the width W1 and the width W3 are fixed, wherein when the ratio of the width W2 with respect to the width W4 is greater than one, the impedance is higher than when the ratio of the width W2 with respect to the width W4 is less than or equal to one.

A deformed folded dipole antenna comprising

• a first parallel section and a second parallel section made of a conductive material, the first parallel section arranged along a first plane and the second parallel section arranged along a second plane parallel with the first plane, a width of the first parallel section is within the first plane and is greater than a thickness of the first parallel section which is within a plane perpendicular to the first plane, and a width of the second parallel section is within the second plane and is greater than a thickness of the second parallel section which is within a plane perpendicular to the second plane, and
• two short sections made of a conductive material, each of the short sections being shorter than the first parallel section and the second parallel section, each of the short sections coupling an end of the first parallel section with a corresponding end of the second parallel section, wherein:
• the second parallel section has a U-shape including a first opposing side portion, a second opposing side portion, and a connecting side portion;
• the first opposing side portion and the second opposing side portion are opposed to each other and the connecting side portion couples an end of the first opposing side portion with an end of the second opposing side portion;
• the first parallel section has a cut U-shape including a first L-shape section and a second L-shape section;
• the first L-shape section includes a portion arranged in parallel with the first opposing side portion and a portion arranged in parallel with a part of the connecting side portion;
• the second L-shape section includes a portion arranged in parallel with the second opposing side portion and a portion arranged in parallel with another part of the connecting side portion;
• the first L-shape section has a feeding point at an end of the portion arranged in parallel with the connecting side portion;
• the second L-shape section has a feeding point at an end of the portion arranged in parallel with the connecting side portion;
• the portion of the first L-shape section arranged in parallel with the connecting side portion is arranged in a same straight line with the portion of the second L-shape section arranged in parallel with the connecting side portion;
• the end of the first L-shape section is opposed to the end of the second L-shape section at a distance;
• the portion of the first L-shape section arranged in parallel with the first opposing side portion and the portion of the second L-shape section arranged in parallel with the second opposing side portion have a width W1 in a first direction along the first plane;
• the portion of the first L-shape section arranged in parallel with the connecting side portion and the portion of the second L-shape section arranged in parallel with the connecting side portion have a width W2 in a second direction along the first plane;
• the first opposing side portion and the second opposing side portion have a width W3 in the first direction along the second plane;
• the connecting side portion has a width W4 in the second direction along the second plane;
• and
• the width W2 is larger than the widths W1, W3, and W4, such that the impedance is higher than when the width W2 is less than or equal to the width W4.

A deformed folded dipole antenna comprising

• a first parallel section and a second parallel section made of a conductive material, the first parallel section arranged along a first plane and the second parallel section arranged along a second plane parallel with the first plane, a width of the first parallel section is within the first plane and is greater than a thickness of the first parallel section which is within a plane perpendicular to the first plane, and a width of the second parallel section is within the second plane and is greater than a thickness of the second parallel section which is within a plane perpendicular to the second plane, and
• two short sections made of a conductive material, each of the short sections being shorter than the first parallel section and the second parallel section, each of the short sections coupling an end of the first parallel section with a corresponding end of the second parallel section, wherein:
• the second parallel section has a U-shape including a first opposing side portion, a second opposing side portion, and a connecting side portion;
• the first opposing side portion and the second opposing side portion are opposed to each other and the connecting side portion couples an end of the first opposing side portion with an end of the second opposing side portion;
• the first parallel section has a cut U-shape including a first L-shape section and a second L-shape section;
• the first L-shape section includes a portion arranged in parallel with the first opposing side portion and a portion arranged in parallel with a part of the connecting side portion;
• the second L-shape section includes a portion arranged in parallel with the second opposing side portion and a portion arranged in parallel with another part of the connecting side portion;
• the first L-shape section has a feeding point at an end of the portion arranged in parallel with the connecting side portion;
• the second L-shape section has a feeding point at an end of the portion arranged in parallel with the connecting side portion;
• the portion of the first L-shape section arranged in parallel with the connecting side portion is arranged in a same straight line with the portion of the second L-shape section arranged in parallel with the connecting side portion;
• the end of the first L-shape section is opposed to the end of the second L-shape section at a distance;
• the portion of the first L-shape section arranged in parallel with the first opposing side portion and the portion of the second L-shape section arranged in parallel with the second opposing side portion have a width W1 in a first direction along the first plane;
• the portion of the first L-shape section arranged in parallel with the connecting side portion and the portion of the second L-shape section arranged in parallel with the connecting side portion have a width W2 in a second direction along the first plane;
• the first opposing side portion and the second opposing side portion have a width W3 in the first direction along the second plane;
• the connecting side portion has a width W4 in the second direction along the second plane;
• and
• the width W4 is larger than the widths W1-W3, such that the impedance is lower than when the width W4 is less than or equal to the width W2.