(0)H01Q:1/3:

(0)H01Q:1/3:

IPC6

SECTION H - ELECTRICITY

AERIALS

H01Q

2/4

H01Q003/00 - H01Q009/46

3

/

00

Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an aerial or aerial system

varying the shape of the aerial or aerial system [3]

using mechanical movement of aerial or aerial system as a whole

for varying one co-ordinate of the orientation

over a restricted angle

for varying two co-ordinates of the orientation

to produce a conical or spiral scan

using mechanical relative movement between primary active elements and secondary devices of aerials or aerial systems

for varying the relative position of primary active element and a refracting or diffracting device

for varying relative position of primary active element and a reflecting device

wherein the primary active element is movable and the reflecting device is fixed

wherein the primary active element is fixed and the reflecting device is movable

varying the orientation in accordance with variation of frequency of radiated wave

varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching

varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture (H 01 Q 3/22, H 01 Q 3/24 take precedence)

varying the amplitude [3]

varying the phase [3]

by mechanical means [3]

by electrical means (active lenses or reflecting arrays H 01 Q 3/46) [3]

with variable phase-shifters [3]

the phase-shifters being digital [3]

with phasing matrix [3]

using frequency-mixing [3]

varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element [3]

Active lenses or reflecting arrays [3]

Arrangements for simultaneous operation of aerials on two or more different wavebands (length of elements adjustable H 01 Q 9/14; combinations of separate active aerial units operating in different wavebands and connected to a common feeder system H 01 Q 21/30) [3]

Resonant aerials [3]

for operation of centre-fed aerials which comprise a single, or two or more collinear, substantially straight elongated active elements [3]

Loop aerials with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Collapsible aerials; Retractable aerials

Screened aerials (H 01 Q 7/02, H 01 Q 7/06 take precedence)

with core of ferromagnetic material (H 01 Q 7/02 takes precedence)

Ferrite rod or like elongated core

Electrically-short aerials having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements (loop aerials H 01 Q 7/00; waveguide horns or mouths H 01 Q 13/00; slot aerials H 01 Q 13/00; combinations of active elements with secondary devices to give desired directional characteristic H 01 Q 19/00; combinations of two or more active elements H 01 Q 21/00)

Non-resonant aerials

Resonant aerials

Junction boxes specially adapted for supporting adjacent ends of collinear rigid elements

Junction boxes specially adapted for supporting adjacent ends of divergent elements

adapted for adjustment of angle between elements

Length of element or elements adjustable (telescopic elements H 01 Q 1/10)

with feed intermediate between the extremities of the aerial, e.g. centre-fed dipole (H 01 Q 9/44 takes precedence)

Vertical disposition of the aerial

Two collinear substantially straight active elements; Substantially straight single active elements (H 01 Q 9/28 takes precedence)

Rigid rod or equivalent tubular element or elements

Shunt feed arrangements to single active elements, e.g. for delta matching

with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength (resonant loop aerials H 01 Q 7/00)

Spiral aerials [3]

Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines (biconical horns H 01 Q 13/04)

with feed to end of elongated active element, e.g. unipole (H 01 Q 9/44 takes precedence)

Vertical arrangement of element (H 01 Q 9/40 takes precedence)

Mast, tower, or like self-supporting or stay-supported aerials

with top loading

with counterpoise (with counterpoise comprising elongated elements coplanar with the active element H 01 Q 9/44)

Element having extended radiating surface

with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Scimitar aerials [3]

with plurality of divergent straight elements, e.g. V-dipole, X-aerial; with plurality of elements having mutually inclined substantially straight portions (turnstile aerials H 01 Q 21/26)

with rigid elements diverging from single point

2