# US 5,705,967 A · High-frequency radiating line

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- Number: US 5,705,967 A
- Document ID: US5705967A
- Status: Granted
- Kind: A
- Application number: 08/628,908
- Filed: 1996-04-08
- Granted: 1998-01-06
- Earliest claimed: 1995-04-07
- Assignees: Institut Scientifique de Service Public
- Inventors: Willy Pirard
- Web page: https://patentgrep.com/patent/US5705967A

## CPC

- H01Q 13/203: {Leaky coaxial lines}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

The line comprises a tubular outer conductor including apertures configured to form a periodic pattern (M) repeated along said outer conductor with a predetermined pitch (p). The periodic pattern has a length (L) equal to p/2.+-..DELTA., along a direction parallel to the axial direction of the line. The periodic pattern can be produced in various embodiments.

## Claims

### Claim 1

A high frequency radiating line intended to radiate electromagnetic energy over a defined frequency band, said defined frequency band extending in increasing frequency from a minimum frequency at which the line radiates electromagnetic energy in a radial direction, which line comprises a tubular outer conductor including apertures configured to form a periodic pattern (M) repeated along said outer conductor with a predetermined pitch (p), said pitch being a fraction of a maximium wavelength, said maximum wavelength corresponding to said minimum frequency, said fraction being equal to 1/((.epsilon..sub.r).sup.1/2 +1) where .epsilon..sub.r is the relative dielectric constant of the line, wherein the periodic pattern (M) has a length (L) equal to p/2.+-..DELTA., along a direction parallel to the axial direction of the line.

### Claim 2 (depends on 1)

The line as claimed in claim 1, wherein .DELTA.=10% of p/2 approximately.

### Claim 3 (depends on 1)

The line as claimed in claim 1, wherein the periodic pattern (M) consists of a slot extending along the generatrix of the outer conductor.

### Claim 4 (depends on 1)

The line as claimed in claim 1, wherein the periodic pattern consists of a slot which is oblique with respect to the generatrix of the outer conductor.

### Claim 5 (depends on 1)

The line as claimed in claim 1, wherein the periodic pattern consists of several identical apertures close together, the projections of which onto a plane containing the longitudinal axis of the line are equidistant.

### Claim 6 (depends on 5)

The line as claimed in claim 5, wherein the periodic pattern (M) comprises at least six apertures.