Cancellation circuit for transmit-receive isolation
Loading...
Authors
Cheng, Wei-Han
Subjects
Advisors
Jenn, David C.
Date of Issue
2010-09
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
This wireless distributed digital phase array (WDDPA) has been proposed for several military applications in the sensor and communication areas. The idea of WDDPA is to use a wireless network for transmitting and receiving data between a master controller and modules in an active phased array instead of using a conventional wired beamforming network. The WDDPA provides several advantages over conventional networks such as battlefield survivability, digital architecture and flexibility of system installation on platforms. A phase synchronization circuit has been developed in the WDDPA application, allowing coherent processing of the data from all elements. There are limitations encountered due to non-ideal hardware, and the performance of the circuit is limited. One of the major problems is the leakage from the circulator. The leakage disrupts the power distributed from the T/R modules. A cancellation circuit has been developed to cancel out the leakage. The performance of the cancellation circuit was investigated by a series of simulations using Agilent ADS (Agilent Advanced Design System), and hardware tests were conducted to characterize the behavior of the circuit. The performance is limited by the accuracy of the attenuator and phase shifter in the cancelation branch. A method for cancelling the residual leakage signal digitally is discussed.
Type
Thesis
Description
Series/Report No
Department
Electronic Warfare Systems Engineering
Electrical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funding
Format
xviii, 63 p. : ill.(chiefly col.) ;
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.