Transponder having high phase stability, particularly for...

Details Transponder having high phase stability, particularly for... Transponder having high phase stability, particularly for...

2005-03-01

2005-03-01

Gregory, Bernarr E. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

C342S02500R, C342S042000, C342S043000, C342S051000, C342S175000, C342S176000, C342S179000, C342S188000, C342S190000, C342S191000, C342S195000

Reexamination Certificate

active

06861971

ABSTRACT:
A transceiver or transponder particularly for synthetic aperture radar, or SAR, systems, operating in a frequency band having a central frequency, the transponder comprising a receiver (1) and a transmitter (2) both thermally stable and made by microstrip technology, the receiver (1) and the transmitter (2) being adapted to receive and to transmit, respectively, an electromagnetic wave provided with at least one linear polarisation, the receiver (1) being connected to the transmitter (2) by amplifier means comprising an amplifier unit (5) for each linear polarisation of the wave received by the receiver (1), each amplifier unit (5) including at least two amplifier stages (7, 9, 11) cascade arranged along a single microstrip and interconnected to one another and to an input and to an output of the corresponding amplifier unit (5) by means of coupling or matching stages (6, 8, 10, 12), the output signal of each amplifier unit (5) having substantially the same frequency as the input signal thereto, the amplifier units (5) having substantially the same gain, the gain being no lower than 25 dB, the transponder being phase stable so that each linear polarisation of the transmitted electromagnetic wave has phase variations in time no higher than 20°, the transponder further comprising electromagnetic decoupling means (4, 14) between the transmitter (2) and the receiver (1).

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