Low profile small antenna and constructing method therefor
First Claim
1. A method for forming a small low-posture antenna which is tuned near a wavelength λ
- , wherein an antenna pattern which resonates at λ
/4 is formed on a surface of a substrate, wherein the substrate is made to oppose and is supported with respect to a planar portion of a metallic frame, wherein a helical coil which resonates at λ
/4 is supported by the metallic frame, wherein one end of the antenna pattern is connected to and is brought into electrical conduction with the metallic frame, and wherein one end of the helical coil and one end of the antenna pattern are made to oppose each other in order to provide capacitance and the other end of the helical coil is connected to an output end of a high-frequency circuit in order to make the helical coil act as an antenna exciter.
1 Assignment
0 Petitions
Accused Products
Abstract
A built-in antenna applied to sending and reception of radio waves of a few giga cycles is improved and made smaller, and is made suitable for industrial production and has its tuning bandwidth widened. “An antenna pattern (6) which resonates at λ/4” is formed on a substrate (5) and a zigzag portion (6a) is provided on a portion of the antenna pattern (6) which resonates at λ/4. On the other hand, the substrate (5) and a bobbin (8) are supported by a metallic frame (7), and “a helical coil (9) which resonates at λ/4” is wound and formed upon the bobbin (8). Capacitance (c) is provided between the antenna pattern (6) which resonates at λ/4 and the helical coil (9) to electrically couple them.
9 Citations
17 Claims
-
1. A method for forming a small low-posture antenna which is tuned near a wavelength λ
- , wherein an antenna pattern which resonates at λ
/4 is formed on a surface of a substrate, wherein the substrate is made to oppose and is supported with respect to a planar portion of a metallic frame, wherein a helical coil which resonates at λ
/4 is supported by the metallic frame, wherein one end of the antenna pattern is connected to and is brought into electrical conduction with the metallic frame, and wherein one end of the helical coil and one end of the antenna pattern are made to oppose each other in order to provide capacitance and the other end of the helical coil is connected to an output end of a high-frequency circuit in order to make the helical coil act as an antenna exciter. - View Dependent Claims (2, 5, 6, 7, 8)
- , wherein an antenna pattern which resonates at λ
-
3. A method for forming a small low-posture antenna which is tuned near a wavelength λ
- , wherein an antenna pattern which resonates at λ
/4 is formed at one end of a surface of a substrate, wherein an exciter pattern which resonates at λ
/4 is formed near the other end of the substrate, wherein the antenna pattern and the exciter pattern are made to oppose each other and to be spaced from each other in order to provide capacitance therebetween, wherein the substrate is supported by a metallic frame having a planar portion that opposes the substrate, and wherein one end of the exciter pattern is connected to an output end of a high-frequency circuit. - View Dependent Claims (4)
- , wherein an antenna pattern which resonates at λ
-
9. A small low-posture antenna which is tuned near a wavelength λ
- comprising a substrate having an antenna pattern which resonates at λ
/4 formed thereon, a metallic frame mounted to one end of the substrate to support the substrate and connected to and brought into electrical conduction with the antenna pattern, a coil bobbin mounted to the metallic frame, a helical coil which is wound and formed upon the bobbin and which resonates at λ
/4, and a coaxial cable which has a core wire connected to and brought into electrical conduction with one end of the helical coil and which has an external conductor connected to and brought into electrical conduction with the metallic frame, wherein the metallic frame is such as to be capable of being mounted to a bottom plate, and the other end of the helical coil and the antenna pattern oppose each other and are spaced from each other in order to provide capacitance therebetween. - View Dependent Claims (10, 16)
- comprising a substrate having an antenna pattern which resonates at λ
-
11. A small low-posture antenna which is tuned near wavelength λ
- , wherein an antenna pattern which resonates at λ
/4 is formed at one end of a surface of a substrate, wherein an exciter pattern which resonates at λ
/4 is formed near the other end of the substrate and both of the patterns are made to oppose each other and to be spaced from each other in order to provide capacitance therebetween, wherein the substrate is supported by the metallic frame and the antenna pattern is connected to and brought into electrical conduction with the metallic frame, wherein an external conductor of a coaxial cable is connected to and brought into electrical conduction with the metallic frame and a core wire of the coaxial cable is connected to and brought into electrical conduction with “
a portion near an end portion situated at the opposite side of a portion where the exciter pattern opposes the antenna pattern,” and
wherein the metallic frame is such as to be capable of being mounted to a bottom plate that is formed on a high-frequency circuit board. - View Dependent Claims (12, 13, 14, 15)
- , wherein an antenna pattern which resonates at λ
-
17. A small low-posture antenna which is tuned near a wavelength λ
- comprising a substrate which generally has a strip shape and which has a plate-shaped antenna pattern having a zigzag portion and resonating at λ
/4 formed thereat;
a metallic frame which supports the substrate by being mounted to one end in a longitudinal direction of the substrate, the metallic frame being connected and brought into electrical conduction near the zigzag portion of the plate-shaped antenna pattern;
a coil bobbin mounted to the metallic frame;
a helical coil which is wound and formed upon the bobbin and which resonates at λ
/4; and
a coaxial cable having a core wire connected to and brought into electrical conduction with one end of the helical coil and having an external conductor connected to and brought into electrical conduction with the metallic frame;
wherein the metallic frame comprises;a. a planar portion having substantially the same shape and size as the strip-shaped substrate and opposing the substrate so as to be substantially parallel thereto;
b. an extending portion which is adjacent to a long side of the strip-shaped planar portion and which extends along the same plane in a widthwise direction thereof;
c. a reinforcement edge formed by bending most of a peripheral portion of a rectangular plate-shaped portion, where the planar portion and the extending portion are integrally consecutively formed, in a direction opposite to the substrate; and
d. a bottom plate mounting screw through hole formed in the extending portion;
wherein the other end of the helical coil and the plate-shaped antenna pattern are made to oppose each other and to be spaced from each other in order to provide capacitance therebetween.
- comprising a substrate which generally has a strip shape and which has a plate-shaped antenna pattern having a zigzag portion and resonating at λ
Specification