# US 9,000,993 B2 · Antenna feeding structure and antenna

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,000,993 B2
- Document ID: US9000993B2
- Status: Granted
- Kind: B2
- Application number: 13/645,530
- Filed: 2012-10-05
- Published: 2013-01-31
- Granted: 2015-04-07
- Earliest claimed: 2010-04-06
- Assignees: Radina Co., Ltd
- Applicants: Radina Co., Ltd
- Inventors: Sin-Hyung Jeon; Hyeng-Cheul Choi; Jae-Seok Lee; Oul Cho
- Web page: https://patentgrep.com/patent/US9000993B2

## CPC

- H01Q 5/50: Feeding or matching arrangements for broad-band or multi-band operation
- H01Q 5/371: Branching current paths
- H01Q 7/005: {with variable reactance for tuning the antenna}
- H01Q 9/0421: {with a shorting wall or a shorting pin at one end of the element (H01Q9/0414 takes precedence)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

The disclosure provides an antenna feeding structure having a low frequency loop, an intermediate frequency loop, and a high frequency loop, and generates resonance between the inductance of the intermediate frequency loop itself and a capacitive element in the intermediate frequency loop, wherein the antenna feeding structure is configured to be able to adjust the resonance frequency using the area of the loop and the value of the capacitive element, thereby allowing the antenna to have a broadband characteristic, and further, making it possible to easily design an antenna having a desired band.

## Claims

### Claim 1

An antenna feeding structure for excitation of an antenna radiator, the structure comprising:
a first loop containing a feeding unit and a capacitive element;
a second loop containing the capacitive element and a conducting line directly connecting both ends of the capacitive element; and
a third loop containing the feeding unit and the conducting line, wherein a resonance frequency of the second loop is controlled by an area of the second loop and a capacitance value of the capacitive element, and the area of the second loop and the capacitance value are selected such that the resonance frequency of the second loop is within a desired frequency band.

### Claim 2 (depends on 1)

The structure according to claim 1, wherein an inductance value for forming the resonance frequency is determined depending on the area of the second loop.

### Claim 3 (depends on 1)

The structure according to claim 1, wherein the first loop operates as a high frequency current loop.

### Claim 4 (depends on 1)

The antenna according to claim 1, wherein the third loop operates as a low frequency current loop.

### Claim 5

An antenna feeding structure for excitation of an antenna radiator, the structure comprising:
a first loop containing a feeding unit and a capacitive element;
a second loop containing the capacitive element and an inductive element connected to both ends of the capacitive element; and
a third loop containing the feeding unit and a conducting line, wherein a resonance frequency of the second loop is controlled by an area of the second loop, an inductance value of the inductive element and a capacitance value of the capacitive element, and the area of the second loop, the inductance value, and the capacitance value are selected such that the resonance frequency of the second loop is within a desired frequency band.

### Claim 6 (depends on 5)

The structure according to claim 5, wherein the inductance for resonance in the second loop is determined by the area of the second loop and the inductance value of the inductive element.

### Claim 7 (depends on 5)

The structure according to claim 5, wherein the first loop operates as a high frequency current loop.

### Claim 8 (depends on 5)

The structure according to claim 5, wherein the third loop operates as a low frequency current loop.

### Claim 9

An antenna having an antenna feeding structure for excitation of an antenna radiator, the antenna comprising:
a feeding unit;
the antenna radiator; and
the antenna feeding structure, wherein the antenna feeding structure includes:
a first loop containing the feeding unit and a capacitive element;
a second loop containing the capacitive element and a conducting line directly connecting both ends of the capacitive element; and
a third loop containing the feeding unit and the conducting line, wherein a band of the antenna is controlled by an area of the second loop, wherein the area of the second loop and a capacitance value of the capacitive element are selected such that a resonance frequency of the second loop is within a desired frequency band of the antenna.

### Claim 10 (depends on 9)

The antenna according to claim 9, wherein the band of the antenna is controlled by inductance corresponding to the area of the second loop and a resonance frequency corresponding to a capacitance value of the capacitive element.