An Analog Canceller for Improved COTS Circulator Isolation

Abstract

An analog canceller circuit is added to a commercial off the shelf (COTS) magnetic circulator. Barium-strontium-Titanate (BST) tunable capacitors adjust the return loss at the antenna port to reflect signal back into the circulator with the proper amplitude and phase to cancel transmit leakage at the receive port. The circuit increases the isolation by 20-22dB over a 37.5MHz bandwidth with 0.4dB of additional insertion loss. The 950MHz center frequency can be scaled to other frequencies.

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Document Details

Document Type
Technical Report
Publication Date
Mar 25, 2019
Accession Number
AD1076169

Entities

People

  • Charles F. Campbell
  • Jaber A. Khoja
  • Jon A. Lovseth
  • Paul B. Schmid

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Barium Strontium Titanates
  • Cancellation
  • Capacitance
  • Capacitors
  • Coefficients
  • Control Systems
  • Department Of Defense
  • Detection
  • Detectors
  • Insertion Loss
  • Losses
  • Operational Amplifiers
  • Power Levels
  • Radio Equipment
  • Signal Processing
  • Simultaneous Equations
  • Variable Capacitors

Fields of Study

  • Physics

Readers

  • Microwave Engineering.
  • Phased Array Antenna Design.