Accession Number : ADD013399

Title :   Active Matching Transmit/Receive Module.

Descriptive Note : Patent, Filed 12 Mar 86, patented 21 Jul 87,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Jones, Edward J

Report Date : 21 Jul 1987

Pagination or Media Count : 9

Abstract : A transmit/receive module is disclosed that provides selectable impedance matching between: a power amplifier and the antenna of a phased array when the radar is transmitting, and selectable impedance matching between the antenna and a low noise amplifier when the radar is receiving. The transmit/receive module replaces the conventional fixed impedance matching system with a microprocessor, a plurality of switches and sets of pairs of electrical capacitors, resistors, and inductors. Since the antenna impedance characteristics change with changes of beam angles, the microprocessor directs the switches to configure the electrical components into any one of a number of impedance matching circuits. The microprocessor selects an optimum impedance matching circuit for the power amplifier to maintain maximum power transfer for radar transmission and another optimum impedance matching circuit for the low noise amplifier to minimum noise upon radar signal reception.

Descriptors :   *ANTENNAS, *IMPEDANCE, *IMPEDANCE MATCHING, *LOW NOISE AMPLIFIERS, *PHASED ARRAYS, *POWER AMPLIFIERS, *RADAR, *RADAR RECEIVERS, *RADAR TRANSMITTERS, *PATENTS, ANGLES, CAPACITORS, CIRCUITS, ELECTRICAL EQUIPMENT, ELECTRICAL PROPERTIES, INDUCTORS, MATCHING, MICROPROCESSORS, OPTIMIZATION, POWER, RADAR SIGNALS, TRANSFER

Subject Categories : Active & Passive Radar Detection & Equipment
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE