US2735073A - Bandpass - Google Patents

Bandpass Download PDF

Info

Publication number
US2735073A
US2735073A US2735073DA US2735073A US 2735073 A US2735073 A US 2735073A US 2735073D A US2735073D A US 2735073DA US 2735073 A US2735073 A US 2735073A
Authority
US
United States
Prior art keywords
conductor
filter
shorting
probes
bypass
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 - Lifetime
Application number
Other languages
English (en)
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.)
Publication date
Application granted granted Critical
Publication of US2735073A publication Critical patent/US2735073A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • 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

Definitions

  • ATTORNEY probe system including probes 7 and 8 extending through layer 14 and openings 10 and 10a in wall 13 to couple signal energy from filter 9, establishing the desired bypass communication whereby easy tuning of the circuitry associated with said filter in a'microwave system may be achieved.
  • This small variation in the width of the line conductor may produce variations in the characteristic impedance of transmission line 11 as desired, but the field distribution with respect to the ground conductor is not materially disturbed, or if disturbed it quickly stabilizes itself to provide the desired by-pass communication under the new line conductor conditions.
  • the means to control the bypass communication shown in Figs. 2 and 3 comprises a pivoted segment 17 substantially identical to the line conductor 12, the segment being pivoted as indicated bypin 18 which may comprise conductive metal or dielectric material.
  • the pin 18 is of conductive material it is made short so as not to extend to the wall 13. By keeping such a pin small in diameter and spaced from wall 13 it has substantially no eifect on the flow of high frequency energy along the line.
  • switches may be made to the aforementioned copending application, Serial No. 280,106.
  • switch 17 in relation to the coupling probes 7 and 8 is important herein to provide proper impedance terminations for the probes when the switch is in open position. To assure in effect a shortcircuit condition at the probes it is necessary that the open terminals of the switch be located a distance from each of the probes 7 and 8, where N is equal to an odd integer.
  • the opening in conductor 12 caused by switch 17 occurs one quarter wavelength from either one of the probes while the remaining probe may be located any odd number of quarter wavelengths from the switch.
  • the probes 7 and 8 remain in the path of signal propagation at all times with the bypass communication being controlled by means of switch 17, which when opened produces an effective short at the probes.
  • switch 17 By leaving the coupling probes in the path of signal energy during opening of the switch 17 does not disturbappreciably any alignment and tuning accomplished during by-pass communication.
  • a shorting means 19 shown herein to be a screw, may replace switch 17 of Figs. 2 and 3 to provide means for controlling the bypass communica tion.
  • Line conductor 12:: and dielectric material 1% are provided with an aperture 20 which may be threaded for reception of shorting means 19.
  • a stiffening member 21 is also provided contiguous to conductor 12a to reduce possible stresses set up in conductor 12a upon transverse movement of shorting means 19. To interrupt by-pass communication shorting means 19 is moved transversely into contact with ground conductor 13a, thereby shorting line conductor 12a.
  • the shorting means 19 is located a distance from each of probes 7a and 8a, where N is equal to an integer, thus providing proper impedance termination for each probe when the shorting means is in the interruption position to introduce the selectivity characteristics of the filter to the system.
  • the location of shorting means from the probes as outlined hereinabove assures an effective short circuit at the probes.
  • a shorting screw may comprise a key slidable in a keyway formed in the dielectric transversely of the line conductor whereby the key may be moved to a shorting position between the conductors.
  • Fig. 5 illustrates an attenuator which may replace switch 17 of Figs. 2 and 3 to provide means to control the by-pass communication.
  • Line conductor 12b will be continuous from one coupling probe to the other in this embodiment.
  • Pivoted segment 22 comprises a lossy conductive material, the segment being pivoted by means of pin 23.
  • To disrupt the by-pass communication attenuator portion 22 is pivoted to the position shown by the dotted lines such that the by-pass energy will be absorbed by said attenuator.
  • the coupling probes extend into the path of the signal energy just sufficient to by-pass the minimum amount of energy required to align and tune preliminarily the circuitry as sociated with a given preselector filter in a microwave system.
  • a microwave bandpass filter system comprising a filter which includes a section of a waveguide, signal input means and signal output means for said filter, and a transmission line to provide a filter bypass communication between said signal input means and said signal output means to bypass a portion of the signal energy about said filter to reduce the selectivity of said filter during tuning adjustments, and means to interrupt the bypass communication after tuning to introduce the selectivity characteristics of said filter, said transmission line including first and second conductors disposed in spaced substantially parallel relation 21 small fraction of a quarter wavelength apart wherein the second of said conductors comprises a wall of said waveguide section.
  • a filter according to claim 1, wherein said interrupting means comprises a segment of said first conductor movable between line opening and closing positions.
  • a filter according to claim 1, wherein said interrupting means comprises a portion of said first conducto pivoted at one end thereof.
  • a filter according to claim 3, wherein said interrupting means is located an odd number of quarter wavelengths away from each of said input means and said output means.
  • said interrupting means comprises an attenuator including a body of lossy material with at least a section of said body being adapted to be disposed in the electromagnetic path of said transmission line.
  • said interrupting means comprises a body of lossy material and means pivotally supporting said body on said wall for movement relative said first conductor.
  • a filter according to claim 1, wherein said interrupting means comprises a line shorting element and means for moving said element into conductive relation with respect to both said conductors.
  • a combination filter and bypass system comprising a filter having a housing of conductive material, said housing having a signal input at one end thereof and a signal output at the other end thereof, a wall of said housing having an opening therethrough adjacent the input end of said housing and another opening adjacent the output end of said housing, a conductor disposed in spaced parallel relation to said wall and extending between said openings, and means coupling said conductor through said openings to the interior of said housing to form a bypass communication directly between the input and output ends of said filter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
US2735073D 1952-08-02 Bandpass Expired - Lifetime US2735073A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US334108XA 1952-08-02 1952-08-02

Publications (1)

Publication Number Publication Date
US2735073A true US2735073A (en) 1956-02-14

Family

ID=21870252

Family Applications (1)

Application Number Title Priority Date Filing Date
US2735073D Expired - Lifetime US2735073A (en) 1952-08-02 Bandpass

Country Status (2)

Country Link
US (1) US2735073A (fr)
CH (1) CH334108A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773244A (en) * 1952-08-02 1956-12-04 Itt Band pass filter
US2829348A (en) * 1952-04-02 1958-04-01 Itt Line-above-ground to hollow waveguide coupling
US2863093A (en) * 1952-04-08 1958-12-02 Itt Traveling wave electron discharge devices
US2866167A (en) * 1955-05-26 1958-12-23 Itt Microwave switch
US2877426A (en) * 1953-02-02 1959-03-10 Itt Microwave transmission lines
US2901709A (en) * 1954-12-14 1959-08-25 Gen Electric Wave coupling arrangement
US2937259A (en) * 1957-02-01 1960-05-17 Du Mont Allen B Lab Inc Ultra-high frequency heating apparatus
US3359513A (en) * 1965-08-31 1967-12-19 Douglas J Kelley Strip transmission line having phase trimmer means
EP0154496A3 (en) * 1984-02-27 1988-01-27 Sony Corporation Microstrip circuits

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2272589A (en) * 1938-04-07 1942-02-10 Lorenz C Ag Regenerative wave band filter
US2390768A (en) * 1944-10-07 1945-12-11 Gen Electric Variable selectivity amplifier
US2519524A (en) * 1947-08-13 1950-08-22 Hazeltine Research Inc Multiple-tuned wave-selector system
US2611822A (en) * 1945-02-03 1952-09-23 Bliss William Roderic Coupling device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2272589A (en) * 1938-04-07 1942-02-10 Lorenz C Ag Regenerative wave band filter
US2390768A (en) * 1944-10-07 1945-12-11 Gen Electric Variable selectivity amplifier
US2611822A (en) * 1945-02-03 1952-09-23 Bliss William Roderic Coupling device
US2519524A (en) * 1947-08-13 1950-08-22 Hazeltine Research Inc Multiple-tuned wave-selector system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2829348A (en) * 1952-04-02 1958-04-01 Itt Line-above-ground to hollow waveguide coupling
US2863093A (en) * 1952-04-08 1958-12-02 Itt Traveling wave electron discharge devices
US2773244A (en) * 1952-08-02 1956-12-04 Itt Band pass filter
US2877426A (en) * 1953-02-02 1959-03-10 Itt Microwave transmission lines
US2901709A (en) * 1954-12-14 1959-08-25 Gen Electric Wave coupling arrangement
US2866167A (en) * 1955-05-26 1958-12-23 Itt Microwave switch
US2937259A (en) * 1957-02-01 1960-05-17 Du Mont Allen B Lab Inc Ultra-high frequency heating apparatus
US3359513A (en) * 1965-08-31 1967-12-19 Douglas J Kelley Strip transmission line having phase trimmer means
EP0154496A3 (en) * 1984-02-27 1988-01-27 Sony Corporation Microstrip circuits

Also Published As

Publication number Publication date
CH334108A (fr) 1958-11-15

Similar Documents

Publication Publication Date Title
US3025478A (en) Microwave devices for waveguides of circular cross section
US3462713A (en) Waveguide-stripline transducer
US2749523A (en) Band pass filters
US2740094A (en) Wave-guide impedance elements
GB761762A (en) Microwave transmission systems and impedance matching devices therefor
US2427100A (en) Microwave variable reactances
US2679632A (en) Directional coupler
US2527146A (en) Broad band coaxial line to wave guide coupler
US2916712A (en) Microwave diplexer
US3215955A (en) Waveguide switching by variable tuning of a cavity which shunts a band-pass filter
US2388049A (en) Attenuator
US4023123A (en) Microstrip reverse-phased hybrid ring coupler
US3417351A (en) Digitally tuned microwave filter
US3697902A (en) Slotted microstrip line for impedance matching having two stops to prevent ohmic contact between the movable reactive element and the center strip
US2630492A (en) High-frequency phase shifting apparatus
US2427106A (en) Attenuator for centimeter waves
US2486818A (en) Wave-signal directional coupler
US2510064A (en) Radio-frequency transmission system
US3175218A (en) Variable electronic slot coupler
GB1245788A (en) Improvements in or relating to electromagnetic waveguide circulators
US3516031A (en) Tunable microwave switching
US3384841A (en) Ferrite phase shifter having longitudinal and circular magnetic fields applied to the ferrite
US2866167A (en) Microwave switch
US2773244A (en) Band pass filter
US2395441A (en) Modulator circuit