# US 8,542,150 B2 · Planar broadband antenna

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- Number: US 8,542,150 B2
- Document ID: US8542150B2
- Status: Granted
- Kind: B2
- Application number: 12/808,581
- Filed: 2007-12-17
- Published: 2011-03-10
- Granted: 2013-09-24
- Earliest claimed: 2007-12-17
- Assignees: Siemens Aktiengesellschaft
- Applicants: Gerhard Rötter
- Inventors: Gerhard Rötter
- Web page: https://patentgrep.com/patent/US8542150B2

## CPC

- H01Q 1/2225: {used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal}
- H01Q 13/106: {Microstrip slot antennas (patch antenna elements H01Q9/0407)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

A planar antenna comprising a planarly configured inner radiation element that is surrounded by an outer radiation element, wherein the inner and outer radiation elements each have a feed point. A continuous or discontinuous modification of the distance, which is equal in relation to a symmetrical axis of the inner radiation element, exists between the inner radiation element and the outer radiation element. The distance between the outer and the inner radiation element is different in the area of the two feed points from that in the area facing away from the feed points.

## Claims

### Claim 1

A planar antenna, comprising:
an inner antenna element configured as an isosceles triangle; and
an outer antenna element surrounding the inner antenna element, the inner antenna element and the outer antenna element each having a feed point;
wherein a continuous or discontinuous change is provided in a distance between the inner antenna element and the outer antenna element, the continuous or discontinuous change being identical with respect to an axis of symmetry of the inner antenna element;
wherein the distance between the outer antenna element and the inner antenna element in a region of the feed points of the inner and outer antenna elements being different than in a region remote from the feed points of the inner and outer antenna elements; and
wherein each feed point of the inner and outer antenna elements is arranged in a vicinity of the axis of symmetry of the inner antenna element.

### Claim 2 (depends on 1)

The planar antenna as claimed in claim 1, wherein the inner antenna element and the outer antenna element are disposed in a same plane.

### Claim 3 (depends on 1)

The planar antenna as claimed in claim 1, wherein the inner antenna element and the outer antenna element are disposed in a same plane.

### Claim 4 (depends on 1)

The planar antenna as claimed in claim 1, wherein the inner antenna element includes a cutout.

### Claim 5 (depends on 4)

The planar antenna as claimed in claim 4, wherein the cutout is configured as a slot.

### Claim 6 (depends on 1)

The planar antenna as claimed in claim 1, wherein a longitudinal extent of the inner antenna element is approximately one quarter of a wavelength of an operational frequency of the planar antenna.

### Claim 7 (depends on 1)

The planar antenna as claimed in claim 1, wherein the planar antenna is implemented in a radio frequency identification (RFID) transponder.

### Claim 8 (depends on 1)

The planar antenna as claimed in claim 1, wherein the outer antenna element is arranged in a loop.

### Claim 9 (depends on 1)

The planar antenna as claimed in claim 1, wherein the outer antenna element provides a return conductor system.

### Claim 10 (depends on 1)

The planar antenna as claimed in claim 1, wherein the inner antenna element is planar.