SLOT LINE

• US 3,760,302 A
• Filed: 05/04/1972
• Issued: 09/18/1973
• Est. Priority Date: 05/21/1969
• Status: Expired due to Term

• Current Assignee: Seymour B. Cohn
• Original Assignee: Seymour B. Cohn
• Inventors: Cohn, Seymour B.
• Primary Examiner(s): Rolinec, Rudolph V.
• Assistant Examiner(s): Nussbaum, Marvin
• Application Number:
  US05/250,455
• Time in Patent Office: 502 Days
• Field of Search: 333/84,84M,7S,73S,73R,10,82R,83R
• US Class Current: 333/204
• CPC Class Codes: H01P 1/2016 Slot line filters; Fin line filters
• CPC Class Codes: H01P 3/081 Microstriplines
• CPC Class Codes: H01P 3/085 Triplate lines
• CPC Class Codes: H01P 5/02 with invariable factor of coupling H01P5/12 takes precedence choke joints H01P1/04, H01P1/06
• CPC Class Codes: H01P 5/10 for coupling balanced lines or devices with unbalanced lines or devices
• CPC Class Codes: H01P 5/1007 Microstrip transitions to Slotline or finline

Abstract

This invention relates to a low loss transmission line having a slotted metal deposited or etched on a high permittivity substrate. with various sizes, shapes and configurations of slots, the transmission line may be used as part of components such as hybrid junctions, couplers, filters, mixers, amplifiers, ferrite devices, and resonators. Novel slot/coax and slot/stripline junctions or connections are disclosed as well as novel methods of slot excitation.

Claims

1. A band-stop filter arrangement comprising:

a high permittivity substrate having a first and a second side;

a conductive metal layer in contact with and covering said first side of said substrate, said second side being exposed to air;

a series of elongated resonant slots located in said conductive metal layer and spaced along a preselected line, the first and the last of said series of elongated slots being positioned symmetrically with respect to said preselected line, with the intermediate slots offset from said preselected line; and

input-output coupling means positioned on said second side of said substrate in parallel with said pre-selected line such that the first and last slots of said series of elongated resonant slots are perpendicular to said coupling means for effecting a tight coupling, with said offset slots providing slightly less coupling, such that the combined total coupling effective provides the desired band-stop filtering of a signal introduced into the input-coupling means and extracted from the output thereof.

2. The filter arrangement according to claim 1 and further comprising that:

said coupling means includes a microstrip line.