|  | H |
SECTION H — ELECTRICITY

|  | H01 |
BASIC ELECTRIC ELEMENTS

|  | H01 |
Note(s) Processes involving only a single technical art, e.g. drying, coating, for which provision exists elsewhere are classified in the relevant class for that art.

|  | H01P |
WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies Fulltext... Hierarchy... Expanded...G02B; aerials Fulltext... Hierarchy... Expanded...H01Q; networks comprising lumped impedance elements Fulltext... Hierarchy... Expanded...H03H)

|  | H01P |
Note(s) In this sub-class, the term "waveguide type" as applied to transmission lines includes only high-frequency coaxial cables or Lecher lines, and as applied to resonators, delay lines, or other devices includes all devices having distributed inductance and capacitance.

|  | H01P 1/00 |
Auxiliary devices (coupling devices of the waveguide type Fulltext... Hierarchy... Expanded...H01P 5/00)

|  | H01P 1/02 |
· | Bends; Corners; Twists

|  | H01P 1/04 |
· | Fixed joints (line connectors Fulltext... Hierarchy... Expanded...H01R; cable fittings Fulltext... Hierarchy... Expanded...H02G 15/00)

|  | H01P 1/06 |
· | Movable joints, e.g. rotating joints

|  | H01P 1/08 |
· | Dielectric windows (coupling devices for transit-time tubes Fulltext... Hierarchy... Expanded...H01J 23/32)

|  | H01P 1/10 |
· | for switching or interrupting

|  | H01P 1/11 |
· · | by ferromagnetic devices [3]

|  | H01P 1/12 |
· · | by mechanical chopper

|  | H01P 1/14 |
· · | by electric discharge devices (discharge devices Fulltext... Hierarchy... Expanded...H01J 17/64)

|  | H01P 1/15 |
· · | by semiconductor devices [2]

|  | H01P 1/16 |
· | for mode selection, e.g. mode suppression or mode promotion; for mode conversion (linking dissimilar lines or devices Fulltext... Hierarchy... Expanded...H01P 5/08)

|  | H01P 1/161 |
· · | sustaining two independent orthogonal modes, e.g. orthomode transducer [3]

|  | H01P 1/162 |
· · | absorbing spurious or unwanted modes of propagation [3]

|  | H01P 1/163 |
· · | specifically adapted for selection or promotion of the TE01 circular-electric mode [3]

|  | H01P 1/165 |
· | for rotating the plane of polarisation [2]

|  | H01P 1/17 |
· · | for producing a continuously rotating polarisation, e.g. circular polarisation [2]

|  | H01P 1/175 |
· · | using Faraday rotators [3]

|  | H01P 1/18 |
· | Phase-shifters (Fulltext... Hierarchy... Expanded...H01P 1/165 takes precedence; coupling devices with variable coupling factor Fulltext... Hierarchy... Expanded...H01P 5/04) [2]

|  | H01P 1/185 |
· · | using a diode or a gas filled discharge tube [3]

|  | H01P 1/19 |
· · | using a ferromagnetic device [3]

|  | H01P 1/195 |
· · · | having a toroidal shape [3]

|  | H01P 1/20 |
· | Frequency-selective devices, e.g. filters (resonators Fulltext... Hierarchy... Expanded...H01P 7/00)

|  | H01P 1/201 |
· · | Transverse electromagnetic filters (Fulltext... Hierarchy... Expanded...H01P 1/212, Fulltext... Hierarchy... Expanded...H01P 1/213, Fulltext... Hierarchy... Expanded...H01P 1/215, Fulltext... Hierarchy... Expanded...H01P 1/219 take precedence) [3]

|  | H01P 1/202 |
· · · | Coaxial filters (cascaded coaxial cavities Fulltext... Hierarchy... Expanded...H01P 1/205) [3]

|  | H01P 1/203 |
· · · | Strip line filters [3]

|  | H01P 1/205 |
· · · | Comb or interdigital filters; Cascaded coaxial cavities (Fulltext... Hierarchy... Expanded...H01P 1/203 takes precedence) [3]

|  | H01P 1/207 |
· · | Hollow waveguide filters (Fulltext... Hierarchy... Expanded...H01P 1/212, Fulltext... Hierarchy... Expanded...H01P 1/213, Fulltext... Hierarchy... Expanded...H01P 1/215, Fulltext... Hierarchy... Expanded...H01P 1/219 take precedence) [3]

|  | H01P 1/208 |
· · · | Cascaded cavities; Cascaded resonators inside a hollow waveguide structure (Fulltext... Hierarchy... Expanded...H01P 1/205 takes precedence) [3]

|  | H01P 1/209 |
· · · | comprising one or more branching arms or cavities wholly outside the main waveguide [3]

|  | H01P 1/211 |
· · · | Waffle-iron filters; Corrugated structures [3]

|  | H01P 1/212 |
· · | suppressing or attenuating harmonic frequencies (Fulltext... Hierarchy... Expanded...H01P 1/215 takes precedence) [3]

|  | H01P 1/213 |
· · | combining or separating two or more different frequencies (Fulltext... Hierarchy... Expanded...H01P 1/215 takes precedence) [3]

|  | H01P 1/215 |
· · | using ferromagnetic material [3]

|  | H01P 1/217 |
· · · | the ferromagnetic material acting as a tuning element in resonators [3]

|  | H01P 1/218 |
· · · | the ferromagnetic material acting as a frequency selective coupling element, e.g. YIG-filters [3]

|  | H01P 1/219 |
· · | Evanescent mode filters [3]

|  | H01P 1/22 |
· | Attenuating devices (dissipative terminating devices Fulltext... Hierarchy... Expanded...H01P 1/26)

|  | H01P 1/23 |
· · | using ferromagnetic material [3]

|  | H01P 1/24 |
· | Terminating devices

|  | H01P 1/26 |
· · | Dissipative terminations

|  | H01P 1/28 |
· · | Short-circuiting plungers (coupling devices with variable coupling factor Fulltext... Hierarchy... Expanded...H01P 5/04)

|  | H01P 1/30 |
· | for compensation of, or protection against, temperature or moisture effects

|  | H01P 1/32 |
· | Non-reciprocal transmission devices (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01P 1/02-H01P 1/30 take precedence)

|  | H01P 1/34 |
( transferred to Fulltext... Hierarchy... Expanded...H01P 1/10, Fulltext... Hierarchy... Expanded...H01P 1/175, Fulltext... Hierarchy... Expanded...H01P 1/20, Fulltext... Hierarchy... Expanded...H01P 1/22 )

|  | H01P 1/36 |
· · | Isolators [2]

|  | H01P 1/365 |
· · · | Resonance absorption isolators [3]

|  | H01P 1/37 |
· · · | Field displacement isolators [3]

|  | H01P 1/375 |
· · · | using Faraday rotators [3]

|  | H01P 1/38 |
· · | Circulators [2]

|  | H01P 1/383 |
· · · | Junction circulators, e.g. Y-circulators [3]

|  | H01P 1/387 |
· · · · | Strip line circulators [3]

|  | H01P 1/39 |
· · · · | Hollow waveguide circulators [3]

|  | H01P 1/393 |
· · · | using Faraday rotators [3]

|  | H01P 1/397 |
· · · | using non-reciprocal phase shifters (Fulltext... Hierarchy... Expanded...H01P 1/393 takes precedence) [3]

|  | H01P 1/40 |
( transferred to Fulltext... Hierarchy... Expanded...H01P 1/175 )

|  | H01P 3/00 |
Waveguides; Transmission lines of the waveguide type

|  | H01P 3/02 |
· | with two longitudinal conductors

|  | H01P 3/04 |
· · | Lines formed as Lecher wire pairs

|  | H01P 3/06 |
· · | Coaxial lines (not suitable for handling frequencies considerably beyond the audio range Fulltext... Hierarchy... Expanded...H01B 11/18)

|  | H01P 3/08 |
· · | Microstrips; Strip lines

|  | H01P 3/10 |
· | Wire waveguides, i.e. with a single solid longitudinal conductor

|  | H01P 3/12 |
· | Hollow waveguides (Fulltext... Hierarchy... Expanded...H01P 3/20 takes precedence)

|  | H01P 3/123 |
· · | with a complex or stepped cross-section, e.g. ridged or grooved waveguides (Fulltext... Hierarchy... Expanded...H01P 3/14 takes precedence) [3]

|  | H01P 3/127 |
· · | with a circular, elliptic, or parabolic cross-section [3]

|  | H01P 3/13 |
· · | specially adapted for transmission of the TE01 circular-electric mode [2]

|  | H01P 3/14 |
· · | Flexible

|  | H01P 3/16 |
· | Dielectric waveguides, i.e. without a longitudinal conductor

|  | H01P 3/18 |
· | built-up from several layers to increase operating surface, i. e. alternately conductive and dielectric layers

|  | H01P 3/20 |
· | Quasi-optical arrangements for guiding a wave, e.g. focusing by dielectric lenses (quasi-optical devices per se Fulltext... Hierarchy... Expanded...H01Q 15/00)

|  | H01P 5/00 |
Coupling devices of the waveguide type (non-reciprocal devices Fulltext... Hierarchy... Expanded...H01P 1/32; for introducing or removing wave energy to or from the discharge in transit-time tubes Fulltext... Hierarchy... Expanded...H01J 23/32)

|  | H01P 5/02 |
· | with invariable factor of coupling (Fulltext... Hierarchy... Expanded...H01P 5/12 takes precedence)

|  | H01P 5/04 |
· | with variable factor of coupling

|  | H01P 5/08 |
· | for linking dissimilar lines or devices (Fulltext... Hierarchy... Expanded...H01P 1/16, Fulltext... Hierarchy... Expanded...H01P 5/04 take precedence; linking lines of the same kind but with different dimensions Fulltext... Hierarchy... Expanded...H01P 5/02)

|  | H01P 5/10 |
· · | for coupling balanced with unbalanced lines or devices

|  | H01P 5/103 |
· · · | Hollow-waveguide/coaxial-line transitions [3]

|  | H01P 5/107 |
· · · | Hollow-waveguide/strip-line transitions [3]

|  | H01P 5/12 |
· | Coupling devices having more than two ports (Fulltext... Hierarchy... Expanded...H01P 5/04 takes precedence)

|  | H01P 5/16 |
· · | Conjugate devices, i.e. devices having at least one port decoupled from one other port [2]

|  | H01P 5/18 |
· · · | consisting of two coupled guides, e.g. directional couplers [2]

|  | H01P 5/19 |
· · · | of the junction type [3]

|  | H01P 5/20 |
· · · · | Magic-T junctions [2]

|  | H01P 5/22 |
· · · · | Hybrid ring junctions [2]

|  | H01P 7/00 |
Resonators of the waveguide type (structurally associated with transit-time tubes and interacting with the discharge therein Fulltext... Hierarchy... Expanded...H01J 23/18; microwave heating devices Fulltext... Hierarchy... Expanded...H05B 6/64)

|  | H01P 7/02 |
· | Lecher resonators

|  | H01P 7/04 |
· | Coaxial resonators

|  | H01P 7/06 |
· | Cavity resonators

|  | H01P 7/08 |
· | Strip line resonators [3]

|  | H01P 7/10 |
· | Dielectric resonators [3]

|  | H01P 9/00 |
Delay lines of the waveguide type (structurally associated with transit-time tubes and interacting with the discharge therein Fulltext... Hierarchy... Expanded...H01J 23/24)

|  | H01P 9/02 |
· | Helical lines

|  | H01P 9/04 |
· | Interdigital lines

|  | H01P 11/00 |
Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type (manufacture of coaxial cables Fulltext... Hierarchy... Expanded...H01B 13/00)