GB581173A - Improvements in band pass filters for ultra-high frequencies - Google Patents
Improvements in band pass filters for ultra-high frequenciesInfo
- Publication number
- GB581173A GB581173A GB1210942A GB1210942A GB581173A GB 581173 A GB581173 A GB 581173A GB 1210942 A GB1210942 A GB 1210942A GB 1210942 A GB1210942 A GB 1210942A GB 581173 A GB581173 A GB 581173A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coupled
- band
- conical
- arrangement
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
- H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
- H01J23/48—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Geophysics And Detection Of Objects (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
581,173. Resonator circuits. STANDARD TELEPHONES & CABLES, Ltd., and WILLOUGHBY, E. O. Aug. 27, 1942, No. 12109. [Classes 39 (i), 40 (iii), and 40 (v)] Two coil-less resonators resonant at the same frequency are coupled together inductively at current anti-nodal points and are designed so that the equivalent series impedances at the coupling point have the same ratio of reactance to resistance so as to give a band-pass effect. In one of the applications described, Fig. 2, one of the resonators 1, 2 forms part of a velocity modulation tube of the kind described in Specification 537,490 for generating oscillations having wave lengths less than 20 cms. and the other 8, 9 terminates in a conical autenna, each being of constant characteristic impedance and a quarter wave-length long, the coupling being by means of radial portions 23, 34 as shown in Fig. 3. With this arrangement, which presents a constant impedance over the pass-band to the energy-extracting gap of the tube, the generated frequency can be varied simply by varying the accelerating voltage without modifying the dimensions of the resonator and the device can thus be used in an altimeter system of the reflection type operating on the known frequency-sweep principle. The invention may also be employed on the receiving circuit of such a system. In one such arrangement, Fig. 5 (not shown), a conical aerial is coupled to a length of coaxial line having a piezo-electric crystal connected at a current antinode. Where a straight aerial is used, the line coupled to it is stepped as shown in Fig. 6 and dimensioned in accordance with Z Z1 the relation -=- where these terms are the Z<1> Z1<SP>1> characteristic impedances of the portions indicated on the drawing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR957839D FR957839A (en) | 1942-08-27 | ||
| GB1210942A GB581173A (en) | 1942-08-27 | 1942-08-27 | Improvements in band pass filters for ultra-high frequencies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1210942A GB581173A (en) | 1942-08-27 | 1942-08-27 | Improvements in band pass filters for ultra-high frequencies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB581173A true GB581173A (en) | 1946-10-03 |
Family
ID=9998545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1210942A Expired GB581173A (en) | 1942-08-27 | 1942-08-27 | Improvements in band pass filters for ultra-high frequencies |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR957839A (en) |
| GB (1) | GB581173A (en) |
-
0
- FR FR957839D patent/FR957839A/fr not_active Expired
-
1942
- 1942-08-27 GB GB1210942A patent/GB581173A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR957839A (en) | 1950-02-25 |
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