Devices for absorbing waves radiated from an aerial; Combinations of such devices with active aerial elements or systems
19
/
00
Combinations of primary active aerial elements and units with secondary devices, e.g. with quasi-optical devices, for giving the aerial a desired directional characteristic
19
/
02
•
Details
19
/
04
•
•
Means for collapsing H-aerials or Yagi aerials
19
/
06
•
using refracting or diffracting devices, e.g. lens
19
/
08
•
•
for modifying the radiation pattern of a radiating horn in which it is located
19
/
09
•
•
wherein the primary active element is coated with or embedded in a dielectric or magnetic material (protective material H 01 Q 1/40; with variable characteristics H 01 Q 3/44) [3]
19
/
10
•
using reflecting surfaces
19
/
12
•
•
wherein the surfaces are concave (H 01 Q 19/18 takes precedence) [3]
19
/
13
•
•
•
the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination (H 01 Q 19/15 takes precedence) [3]
19
/
15
•
•
•
the primary radiating source being a line source, e.g. leaky waveguide aerials [3]
19
/
17
•
•
•
the primary radiating source comprising two or more radiating elements (H 01 Q 19/15, H 01 Q 25/00 take precedence) [3]
19
/
18
•
•
having two or more spaced reflecting surfaces (producing pencil beam by two cylindrical reflectors with their focal lines orthogonally disposed H 01 Q 19/20)
19
/
185
•
•
•
wherein the surfaces are plane [3]
19
/
19
•
•
•
comprising one main concave reflecting surface associated with an auxiliary reflecting surface [3]
19
/
195
•
•
•
•
wherein a reflecting surface acts also as a polarisation filter or a polarising device [3]
19
/
20
•
Producing pencil beam by two cylindrical focusing devices with their focal lines orthogonally disposed
19
/
22
•
using a secondary device in the form of a single substantially straight conductive element
19
/
24
•
•
the primary active element being centre-fed and substantially straight, e.g. H-aerial
19
/
26
•
•
the primary active element being end-fed and elongated
19
/
28
•
using a secondary device in the form of two or more substantially straight conductive elements (log-periodic aerials H 01 Q 11/10; constituting a reflecting surface H 01 Q 19/10)
19
/
30
•
•
the primary active element being centre-fed and substantially straight, e.g. Yagi aerial
19
/
32
•
•
the primary active element being end-fed and elongated
21
/
00
Aerial arrays or systems (producing a beam the orientation or the shape of the directional pattern of which can be changed or varied H 01 Q 3/00; electrically-long aerials H 01 Q 11/00)
21
/
06
•
Arrays of individually energised aerial units similarly polarised and spaced apart
21
/
08
•
•
the units being spaced along, or adjacent to, a rectilinear path
21
/
10
•
•
•
Collinear arrangements of substantially straight elongated conductive units
21
/
12
•
•
•
Parallel arrangements of substantially straight elongated conductive units (travelling-wave aerials comprising transmission line loaded with transverse elements, e.g. "fishbone" aerial,
H 01 Q 11/04)
21
/
14
•
•
•
•
Adcock aerials
21
/
16
•
•
•
•
•
U-type
21
/
18
•
•
•
•
•
H-type
21
/
20
•
•
the units being spaced along, or adjacent to, a curvilinear path
21
/
22
•
•
Aerial units of the array energised non-uniformly in amplitude or phase, e.g. tapered array, binomial array
21
/
24
•
Combinations of aerial units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
21
/
26
•
•
Turnstile or like aerials comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
21
/
28
•
Combinations of substantially independent non-interacting aerial units or systems
21
/
29
•
Combinations of different interacting aerial units for giving a desired directional characteristic (H 01 Q 25/00 takes precedence) [3]
21
/
30
•
Combinations of separate aerial units operating in different wavebands and connected to a common feeder system
23
/
00
Aerials with active circuits or circuit elements integrated within them or attached to them [3]
Notes
(1)
This group covers only such combinations in which the type of aerial or aerial element is immaterial. [3]
(2)
Combinations with a particular type of aerial are classified in the group appropriate to that type. [3]
25
/
00
Aerials or aerial systems providing at least two radiating patterns (arrangements for changing or varying the orientation or the shape of the directional pattern H 01 Q 3/00) [3]
25
/
02
•
providing sum and difference patterns (multimode aerials H 01 Q 25/04) [3]
