Shared Antenna Interface for Simultaneous Transmit and Receive

Technology Description


This technology describes a shared antenna interface for rejecting or passing transmitter and receiver signals. The interface can function up to RF frequencies of interest to cellular and WiFi wireless communications. The architecture is made using discrete or integrated circuits and builds upon N-class circuits where multiple switches are connected to the input enabling very selective filtering at high frequencies. The control signals applied to the switches are such that a certain impedance is presented at the thru and coupled ports for signals that have a certain differences and/or modulation at the thru and coupled ports. For example, the control signals can be configured such that the thru and coupled port present a short impedance for the transmitter signals at the thru and coupled ports while simultaneously ensuring no loss between the antenna and the receiver port.


Features & Benefits


  • Efficient spectrum use
  • Reduced size
  • Rejection of multiple interferers




  • Wireless networks
  • WiFi
  • Radar


Background of Invention


Wireless spectrum is very crowded. In order to increase overall network capacity, spectrum is reused among many users. Also, often it is desirable to have the transmitter and receiver operating at the same time at the same or different frequency (duplex links). In all these cases, the receiver sees strong undesirable signals (either from the transmitter or from other users) along with weak desired signals. Therefore, there remains a need to provide a way to filter multiple undesirable signals enabling recovery of weak signal in the presence of strong interferer.




Provisional patent application filed; available




Patent Information:
Tech ID:
John Sweet
IP & Licensing Manager
Oregon State University
Abhishek Agrawal
Arun Natarajan
Sanket Jain
Wireless communication
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