GB1444540A - Electrical filters - Google Patents
Electrical filtersInfo
- Publication number
- GB1444540A GB1444540A GB4241472A GB4241472A GB1444540A GB 1444540 A GB1444540 A GB 1444540A GB 4241472 A GB4241472 A GB 4241472A GB 4241472 A GB4241472 A GB 4241472A GB 1444540 A GB1444540 A GB 1444540A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stubs
- filter
- pair
- pairs
- slider
- 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
- H01P1/201—Filters for transverse electromagnetic waves
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
1444540 Filters PLESSEY CO Ltd 28 Aug 1973 [13 Sept 1972] 42414/72 Heading H1W Filters are formed by connecting shortcircuited stubs in pairs to spaced common points on a main transmission line. Each pair of stubs forms a complete loop which is shortcircuited at an intermediate point. The connection points are spaced apart by an odd number of quarter-wavelengths at the centre frequency of the filter and the aggregate length of the stubs forming each pair is equal to a multiple of one wavelength at this frequency. Each stub, however, varies from a half-wavelength (or appropriate multiple) by a small amount which determines the band-width of the filter. Thus a filter consists of successive pair of stubs of lengths # 0 /2 Œ# r where r is different for each pair and runs through 1 to n where n is order of the filter. In the 2nd order filter of Fig. 3, the pairs of stubs 1, 2 and 3, 4 (shown as single lines) are each constituted by a loop having a short-circuit realized in the form of a slider which is common to both loops. As shown in Fig. 4a, a rotary slider 15 adjustably connects tracks 10, 11 to a conductive disc 14 to which the earth conductors of all the stubs are connected in common. The "live" conductors of lines 1, 2 are connected respectively to terminals 12 and those of lines 3, 4 to terminals 13. The loops shown in Fig. B are thus completed by the tracks 10, 11. Where there are more than two pairs of stubs, a slider using a number of concentric tracks may be used.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4241472A GB1444540A (en) | 1972-09-13 | 1972-09-13 | Electrical filters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4241472A GB1444540A (en) | 1972-09-13 | 1972-09-13 | Electrical filters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1444540A true GB1444540A (en) | 1976-08-04 |
Family
ID=10424309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4241472A Expired GB1444540A (en) | 1972-09-13 | 1972-09-13 | Electrical filters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1444540A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5376888A (en) * | 1993-06-09 | 1994-12-27 | Hook; William R. | Timing markers in time domain reflectometry systems |
-
1972
- 1972-09-13 GB GB4241472A patent/GB1444540A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5376888A (en) * | 1993-06-09 | 1994-12-27 | Hook; William R. | Timing markers in time domain reflectometry systems |
US5726578A (en) * | 1993-06-09 | 1998-03-10 | Precision Moisture Instruments, Inc. | Apparatus and methods for time domain reflectometry |
US6104200A (en) * | 1993-06-09 | 2000-08-15 | Precision Moisture Instruments, Inc. | Apparatus and methods for generating unambiguous large amplitude timing makers in time domain reflectometry systems for measuring propagation velocities of RF pulses to determine material liquid contents moisture |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |