Co-Site Interference Mitigation in Phased Arrays
Navy SBIR FY2010.1


Sol No.: Navy SBIR FY2010.1
Topic No.: N101-104
Topic Title: Co-Site Interference Mitigation in Phased Arrays
Proposal No.: N101-104-0451
Firm: Toyon Research Corp.
6800 Cortona Drive
Goleta, California 93117-3021
Contact: Michael Gilbert
Phone: (805) 968-6787
Web Site: www.toyon.com
Abstract: The available space for antennas within a submarine sail is extremely limited. To achieve the desired multi-frequency capability for future submarine communications systems, phased array apertures will need to be collocated within a single housing. The resulting close proximity of transmit and receive antennas and the requirement for full duplex communication lead to a challenging electromagnetic interference (EMI) problem. The EMI is especially severe at X-band frequencies where the X-band transmit array and the X-K-band receive array both operate simultaneously. Fortunately, there is some room to physically separate the X-band transmit array from the X-K-band receive array. A choke structure and/or patterned absorber inserted into the space between these two arrays can reduce the X-band EMI while passing through signals from the higher frequency transmit arrays (Ka-band and Q-band) that share the same space. Toyon has extensive experience designing chokes and patterned absorbers tailored to mitigate EMI with a minimal thickness and weight. Toyon proposes to use this experience to investigate the use of an X-band choke/absorber structure that is transparent to signals in the Ka-Q bands.
Benefits: The proposed project will improve the state of the art in collocated antenna arrays. For the U.S. defense community, this provides a means for better utilizing the limited space on military platforms. For the commercial sector, it provides a means to incorporate full duplex communication while utilizing closely spaced transmit and receive antennas.

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