Abstract: An amplifier, suitable for use in a limited band at microwave frequencies, incorporates a single lossless feedback coupling element between the input port and output port of the gain circuitry. The feedback element is formed of two coextending conductors of a length on the order of a quarter wavelength of the center frequency of the band. An input signal is coupled to the gain element through one of the feedback conductors. An output signal is coupled from the output port of the gain element through the other of the conductors of the feedback element. Relatively low closed loop gain, on the order of 10 dB, is achievable over the specified band at center frequencies on the order of 800-1000 MHz.