Antenna device, manufacturing method therefor, and electronic device having antenna device

1. An antenna device comprising:

an insulating substrate;

a first helical antenna pattern formed on one surface of the insulating substrate, the first helical antenna pattern being formed of a first conductive thin film and having a first start end placed inner side of the first helical antenna pattern and a first terminal end protruding from the first helical antenna pattern; and

a second helical antenna pattern formed on the other surface of the insulating substrate the second helical antenna pattern being formed of a second conductive thin film and having a second start end placed inner side of the second helical antenna pattern and a second terminal end protruding from the second helical pattern,

wherein the first start end and the second start end are connected to each other by a conductive member through a via hole formed in the insulating substrate so that the first helical antenna pattern and the second helical antenna pattern form a single antenna pattern, and the first terminal end and the second terminal end function as a terminal of the single antenna pattern to input and output a wireless power signal, and

wherein the first helical antenna pattern and the second helical antenna pattern have a same thickness.

2. The antenna device of claim 1 , wherein the insulating substrate is a rigid substrate or a flexible substrate.

3. The antenna device of claim 1 , wherein the insulating substrate is made of one selected from the group consisting of polyethylene terephthalate (PET), polyimide (PI), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), acrylic resin, heat-resistant epoxy, ethylene vinyl acetate (EVA), butyl rubber resin, polyarylate, silicone, ferrite, ceramic, and FR-4.

4. The antenna device of claim 1 , wherein the first conductive thin film and the second conductive thin film comprise one selected from the group consisting of Fe, Cu, Ni, Zn, Sn, Au, Ag, Pt, Rh (rhodium), Pd (palladium), and an alloy of at least two thereof.

5. The antenna device of claim 4 , wherein the single antenna pattern forms an antenna for wirelessly transmitting and receiving power by a magnetic resonance method or a magnetic induction method.

6. An electronic apparatus incorporating the antenna device of claim 1 .

7. A method of manufacturing an antenna device, the method comprising:

forming an insulating substrate;

forming a first conductive thin film on one surface of the insulating substrate;

forming a second conductive thin film on the other surface of the insulating substrate, wherein the first conductive thin film and the second conductive thin film have a same thickness;

forming a mask pattern on the first conductive thin film and the second conductive thin film;

simultaneously wet-etching the first conductive thin film and the second conductive thin film to form a first helical antenna pattern having a first start end placed inner side of the first helical antenna pattern and a first terminal end protruding from the first helical antenna pattern, and a second helical antenna pattern having a second start end placed inner side of the second helical antenna pattern and a second terminal end protruding from the second helical pattern;

removing the mask pattern; and

connecting the first start end and the second start end for the first helical antenna pattern and the second helical antenna pattern to form a single antenna pattern.