Granted Patent B2

US 10,090,585 · App. 15/244,869 · Granted Oct 2, 2018

Inventors: Tolga Dinc (New York, NY); Harish Krishnaswamy (New York, NY)

Assignee: The Trustees of Columbia University in the City of New York

H01Q1/38H01Q1/525H01Q5/314H01Q21/06H04B1/06H04W16/14

Abstract

Claims (11)

1. A circuit for antenna-based self-interference cancellation, comprising:

a transmit antenna having a transmit port that receives a transmit signal;

a receive antenna having a receive port that is cross-polarized with respect to the transmit port and having an auxiliary port that is co-polarized with respect to the transmit port; and

a termination connected to the auxiliary port that reflects a signal received at the auxiliary port as a reflected signal, wherein the reflected signal counters interference caused by the transmit signal at the receive port.

2. The circuit of claim 1 , wherein the termination is formed from a parallel combination of a resistance, an inductance, and a capacitance.

3. The circuit of claim 2 , wherein the inductance is fixed.

4. The circuit of claim 3 , wherein the inductance is implemented using a transmission line.

5. The circuit of claim 2 , wherein the resistance is implemented using a voltage controlled attenuator.

6. The circuit of claim 2 , wherein the capacitance is implemented using a varactor diode.

7. The circuit of claim 1 , wherein the transmit port, the receive port, and the auxiliary port each have non-zero feed line length.

8. The circuit of claim 1 , wherein a slope of conductance synthesized by the termination over a frequency range is substantially zero.

Assignments (2)

Continuity (2)

Cited By (10)

US 12,237,811 US 12,332,376 US 12,386,029 US 12,386,030 US 12,429,555 US 12,461,219 US 12,498,452 US 12,650,503 US 12,674,865 US 12,681,135