Reflective power splitter for redundant receivers

• US 6,466,773 B1
• Filed: 05/15/1997
• Issued: 10/15/2002
• Est. Priority Date: 05/15/1997
• Status: Expired due to Term

• Current Assignee: Harris Stratex Networks, Inc.
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Johnson, Kent K.
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): SOBUTKA, PHILIP
• Application Number:
  US08/856,752
• Time in Patent Office: 1,979 Days
• Field of Search: 370/275, 370/297, 370/339, 370/272, 370/273, 370/315, 333/1.1, 330/295, 330/124.R, 330/148, 455/82, 455/83, 455/84, 455/78, 455/303, 455/338, 455/296, 455/280, 455/311, 455/132, 455/13.3
• US Class Current: 455/132
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H
• CPC Class Codes: H04B 1/3805 with built-in auxiliary receivers

Abstract

A device and method for splitting received signal energy among plural receivers in which received signal energy is provided to a first receiver which uses a primary portion of the received signal energy and reflects a reflected portion of the received signal energy, and in which the reflected portion is directed to an additional receiver(s) for use. Low loss directional circulators Or couplers may be used to direct the signal. The loss of signal energy to the first and subsequent receiver(s) is significantly reduced.

Claims

1. A method of splitting received signal energy among plural receivers, the method comprising the steps of:

receiving signal energy at an antenna;

providing the received signal energy to a first receiver through a directional coupler which is coupled to a balanced pair of active devices in the first receiver having low input return loss wherein the active devices absorb or transmit the primary portion of the signal energy and reflect the secondary portion;

receiving the reflected secondary portion at the reverse coupler port; and

providing the reflected secondary portion to a second receiver.

2. The method of claim 1 wherein the step of providing the reflected portion to a second receiver is repeated for a multitude of receivers.

3. A device for splitting received signal energy among plural receivers, the device comprising:

an antenna for receiving signal energy;

a first receiver including a balanced pair of low noise amplifiers for receiving and amplifying signal energy and for reflecting signal energy as a function of impedance mismatching;

a first directional coupler coupled to said first receiver for directing the received signal energy to said first receiver and for directing at the reverse coupler port a portion of the received signal energy reflected by said first receiver to subsequent receivers for use,

a second receiver having low input return loss and including a balanced pair of low noise amplifiers and,

a second directional coupler, coupled to said first directional coupler and to said balanced pair of low noise amplifiers, for directing the reflected portion from said first coupler to said second receiver.

4. The system of claim 3 wherein each of said low noise receivers includes a single ended amplifier having a single transistor exhibiting a return loss of less than about 6 dB.

5. The system of claim 3 wherein each of said low noise receivers includes a single ended amplifier having a single transistor having a noise figure of less than about 1.5 dB in the X-band.