Antenna assistant device and electronic device including the same

1. An antenna assistant device comprising:

a capacitor structure comprising stacked capacitor substrates, wherein at least first sides of the stacked capacitor substrates are configured to be electrically connected to an antenna, and at least second sides opposite the first sides of the stacked capacitor substrates are connected to a feeder;

an inductor structure-disposed at a lower or upper portion of the capacitor structure, wherein one side of the inductor structure is configured to be connected to the feeder and another side of the inductor structure opposite the one side is configured to be connected to a ground; and

a floating metal layer disposed between the capacitor structure and the inductor structure,

wherein at least one of the capacitor structure, the inductor structure, and the floating metal layer comprises a dielectric layer of a printed circuit board;

wherein the antenna assistant, including the capacitor structure, the inductor structure, and the floating metal layer, is configured to provide a bandwidth expanding effect.

2. The antenna assistant device of claim 1 , wherein the capacitor structure comprises:

a first capacitor stack comprising a plurality of capacitor substrates electrically connected to each other, each of the plurality of capacitor substrates having a surface, the plurality of capacitor substrates being vertically arranged to be spaced apart from each other at a specific gap;

a second capacitor stack comprising a plurality of capacitor substrates, spaced apart from the plurality of capacitor substrates of the first capacitor stack and electrically connected to each other, each of the plurality of capacitor substrates of the second capacitor stack having a surface, the plurality of capacitor substrates of the second capacitor stack being arranged between the plurality of capacitor substrates of the first capacitor stack;

a plurality of insulation layers that are arranged between the capacitor substrates; and

a via hole that electrically connects at least some of the capacitor substrates.

3. The antenna assistant device of claim 2 , wherein each of the first capacitor stack and the second capacitor stack comprises:

a column formed in a via hole that vertically passes through the plurality of capacitor substrates to electrically connect the plurality of capacitor substrates.

4. The antenna assistant device of claim 2 , wherein the floating metal layer comprises a metallic substrate, an upper insulation layer disposed on the substrate, and a lower insulation layer disposed under the substrate.

5. The antenna assistant device of claim 1 , further comprising one or more of:

at least one of a variable inductor electrically connected to the inductor structure or an auxiliary inductor having an inductance of a specific magnitude;

at least one of a variable capacitor electrically connected to the capacitor structure or an auxiliary capacitor having a specific capacitance;

a first feeding line that electrically connects the capacitor structure to the feeder;

a second feeding line that electrically connects the inductor structure to the feeder;

a ground line that electrically connects the inductor structure to a ground; and

an antenna connection line that electrically connects one side of the capacitor structure to the antenna.

6. An electronic device comprising:

a housing;

a communication circuit disposed on one side of the housing;

a multi-layered printed circuit board PCB disposed on one side of the housing and electrically connected to the communication circuit; and

an antenna radiator disposed on one side of the housing or defining at least a portion of an outer surface of the housing, and electrically connected to the communication circuit and the multi-layered printed circuit board,

wherein the multi-layered printed circuit board comprises:

a first conductive pattern comprising stacked capacitor substrates, wherein at least first sides of the stacked capacitor substrates are configured to be electrically connected to an antenna, and at least second sides opposite the first sides of the stacked capacitor substrates are connected to a feeder;

a second conductive pattern disposed at a lower or upper portion of the first conductive pattern, wherein one side of the second conductive pattern is configured to be connected to the feeder and another side of the second conductive pattern opposite the one side is configured to be connected to a ground; and

a conductive plate disposed between the first conductive pattern and the second conductive pattern,

wherein at least one of the first conductive pattern, the second conductive pattern, and the conductive plate comprises a dielectric layer of the multi-layered printed circuit board;

wherein the first conductive pattern, the second conductive pattern, and the conductive plate are configured to provide a bandwidth expanding effect.

7. The electronic device of claim 6 , further comprising:

a first insulation layer disposed between the first conductive pattern and the conductive plate; and

a second insulation layer disposed between the second conductive pattern and the conductive plate.

8. The electronic device of claim 6 , wherein the conductive plate is electrically floated from another conductor in the electronic device; or

wherein the conductive plate electrically or magnetically shields the first conductive pattern and the second conductive pattern.

9. The electronic device of claim 6 , wherein the first conductive pattern comprises a plurality of planar conductive members disposed in a plurality of layers of the multi-layered printed circuit board.

10. The antenna assistant device of claim 1 , wherein the inductor structure comprises a plurality of bent patterns.

11. The antenna assistant device of claim 10 , wherein the plurality of bent patterns comprise:

meandering patterns.

12. The electronic device of claim 6 , further comprising at least one of:

a connector disposed between the antenna radiator and the multi-layered printed circuit board;

a conductive pad electrically connected to the first conductive pattern; or

a flexible conductive connector that is electrically connected to the antenna radiator and contacts the conductive pad.

13. The electronic device of claim 6 , further comprising:

at least one ground disposed in the interior of the housing,

wherein the first conductive pattern and/or the second conductive pattern is electrically connected to the at least one ground.

14. The electronic device of claim 6 , wherein the multi-layered printed circuit board comprises:

a rigid printed circuit board; and

a flexible printed circuit board attached to the rigid printed circuit board;

wherein any one of the first conductive pattern and the second conductive pattern is disposed in the rigid printed circuit board, and the other of the first conductive pattern and the second conductive pattern is disposed in the flexible printed circuit board.