# US 2013/0278481 A1 · Wideband Antenna Using Electromagnetic Bandgap Structures

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- Number: US 2013/0278481 A1
- Document ID: US20130278481A1
- Status: Published application
- Kind: A1
- Application number: 13/654,412
- Filed: 2012-10-17
- Published: 2013-10-24
- Earliest claimed: 2011-10-17
- Inventors: David R. Voltmer; Eric R. Wandel; Edward Dean Wheeler
- Web page: https://patentgrep.com/patent/US20130278481A1

## CPC

- H01Q 15/0006: {Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices (H01Q15/12, H01Q15/22, H01Q15/24 take precedence)}
- H01Q 1/22: by structural association with other equipment or articles
- H01Q 15/006: {Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces}
- H01Q 15/008: {said selective devices having Sievenpipers' mushroom elements}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

The present invention relates to the field of antennas and specifically to broadband antennas. Planar low-profile antennas over high-impedance surfaces show improved performance compared to that over metal ground planes, but these high-impedance surfaces often operate over narrow bandwidths because current approaches to the design of high-impedance substrates typically employ identical unit cells with the same resonant frequency to produce high-impedance behavior over a relatively narrow frequency range. The present invention provides improved antenna performance over a broader bandwidth through the use of electromagnetic bandgap cells having a size and related resonant frequency that varies with position to the antenna radiating element in order to match the resonance of the element.

## Claims

### Claim 1

An electromagnetic backplane for a radiating antenna element comprising:
electromagnetic bandgap structures having lateral and radial dimensions,
where the lateral and radial dimensions of the electromagnetic bandgap structures increase in size with increasing radius from the center of the radiating antenna element.

### Claim 2 (depends on 1)

The electromagnetic backplane for a radiating antenna element of claim 1, where the shape of the electromagnetic backplane structures is rectangular.

### Claim 3 (depends on 1)

The electromagnetic backplane for a radiating antenna element of claim 1, where the shape of the electromagnetic backplane structures is circular.

### Claim 4 (depends on 1)

The electromagnetic backplane for a radiating antenna element of claim 1, where the shape of the electromagnetic backplane structures is elliptical.

### Claim 5

A broadband antenna comprising:
a radiating antenna element, where the radiating antenna element has a resonance dimension that varies with frequency;
an electromagnetic bandgap structures having lateral and radial dimensions,
where the lateral and radial dimensions of the electromagnetic bandgap structures increase in size with increasing radius from the center of the radiating antenna element, and
where the lateral and radial dimensions of the electromagnetic bandgap structures are selected so that they are resonant at the same frequency as the antenna resonance dimension at a given radius.