# US 4,400,702 A · Shortened antenna having coaxial lines as its elements

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- Number: US 4,400,702 A
- Document ID: US4400702A
- Status: Granted
- Kind: A
- Application number: 06/253,195
- Filed: 1981-04-13
- Granted: 1983-08-23
- Earliest claimed: 1980-05-13
- Inventors: Hiroki Tanaka
- Web page: https://patentgrep.com/patent/US4400702A

## CPC

- H01Q 21/08: the units being spaced along or adjacent to a rectilinear path {(waveguide fed H01Q21/0037)}
- H01Q 9/16: with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole (H01Q9/44 takes precedence)
- H01Q 9/42: with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
- H01Q 11/04: with parts bent, folded, shaped, screened or electrically loaded to obtain desired phase relation of radiation from selected sections of the antenna (H01Q11/06 – H01Q11/10 take precedence)
- H01Q 11/08: Helical antennas
- H01Q 11/10: Logperiodic antennas (H01Q11/08 takes precedence)
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

A modified line antenna, having reduced length and space of occupancy, each element of which is divided into a plurality of segments which are made of coaxial lines connected in series with a novel inventive technique and folded into a short and compact structure at the points of connection without any loss of overall efficiency.

## Claims

### Claim 1

An antenna comprising at least one fundamental antenna element composed of a coaxial line having a length corresponding to one-half or one-quarter wavelength of utilization waves and divided into a plurality of discrete segments, means connecting said segments in series with the inner conductor of one of the adjoining segments being connected to the outer conductor of the other of said adjoining segments and the outer conductor of said one adjoining segment being connected to the inner conductor of said other adjoining segment, said connecting means forming joints between successive segments and said antenna segments being folded at said joints between successive segments, whereby in-phase unbalanced currents flow in the adjoining segments.

### Claim 2 (depends on 1)

An antenna, according to claim 1, wherein each of said segments is straight in shape and said segments are arranged in parallel.

### Claim 3 (depends on 2)

An antenna, according to claim 2, wherein said segments are arranged in a plane.