GB535078A - Tunable selector of uniform band width - Google Patents

Tunable selector of uniform band width

Info

Publication number
GB535078A
GB535078A GB27766/39A GB2776639A GB535078A GB 535078 A GB535078 A GB 535078A GB 27766/39 A GB27766/39 A GB 27766/39A GB 2776639 A GB2776639 A GB 2776639A GB 535078 A GB535078 A GB 535078A
Authority
GB
United Kingdom
Prior art keywords
inductance
coupling
capacity
circuits
filter
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
Application number
GB27766/39A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems Aerospace Inc
Original Assignee
Hazeltine Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hazeltine Corp filed Critical Hazeltine Corp
Publication of GB535078A publication Critical patent/GB535078A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1708—Comprising bridging elements, i.e. elements in a series path without own reference to ground and spanning branching nodes of another series path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1716—Comprising foot-point elements
    • H03H7/1725—Element to ground being common to different shunt paths, i.e. Y-structure
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1758—Series LC in shunt or branch path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1766—Parallel LC in series path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2/00—Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00
    • H03H2/005—Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0138—Electrical filters or coupling circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1775—Parallel LC in shunt or branch path

Abstract

535,078. Filter circuits ; wireless receivers ; valve circuits for receiving high-frequency signals. HAZELTINE CORPORATION. Oct. 12, 1939, No. 27766. Convention date, Oct. 29, 1938. [Classes 40 (iii) and 40 (v)] A filter, e.g. for the input stage of a television receiver, comprises a pair of circuits tunable by means of inductance and capacity respectively and coupled by means such that the co-efficient of coupling varies inversely as the frequency. In one arrangement, Fig. 1, the filter takes the form of a constant-k network terminated by resistances equal to its image impedance which resistances may be the inherent resistances of parts of the circuit. In a modification, Fig. 5, similar circuits are coupled by a capacity Cc. The unwanted inductance L<SP>1</SP>C<SP>1</SP> of the coupling branch in this arrangement or the unwanted capacity of the inductance L1 may be compensated by a condenser Cc<SP>11</SP> and the unwanted capacity of L 2 may be compensated by a condenser in series with the coupling condenser, Fig. 8, (not shown). In another arrangement, Fig. 6, in which anti-resonant circuits are connected in parallel through a coupling inductance LC, the unwanted capacity Cc<SP>1</SP> of the inductance may be compensated by a common inductance L<SP>11</SP>c. Formulae are given for obtaining the sizes of the coupling and compensating elements. In the application to a wireless receiver shown in Fig. 9 the aerial is coupled by a symmetrical transformer arrangement and the filter is tuned in steps by switches. To reduce the input conductance of the first amplifier tube, negative feed back is provided by an inductance 42 in the screen circuit coacting with the inherent capacity between the screen and signal grids, or by a transformer coupling between the cathode and grid circuits.
GB27766/39A 1938-10-29 1939-10-12 Tunable selector of uniform band width Expired GB535078A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US535078XA 1938-10-29 1938-10-29

Publications (1)

Publication Number Publication Date
GB535078A true GB535078A (en) 1941-03-27

Family

ID=21984762

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27766/39A Expired GB535078A (en) 1938-10-29 1939-10-12 Tunable selector of uniform band width

Country Status (1)

Country Link
GB (1) GB535078A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1221376B (en) * 1958-10-16 1966-07-21 Wandel & Goltermann Adjustable band pass

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1221376B (en) * 1958-10-16 1966-07-21 Wandel & Goltermann Adjustable band pass

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