The invention provides a novel method of transmit beamforming, which allows compact analog implementation of complex digital algorithms without compromising their features. A standard die design procedure is stored as \u201cmaster die data\u201d in advance using a function of a CAD system or the like. Further, the unit defines axially aligned top and bottom openings and one or more side openings. The water bottle 15 is connected to the pump 24 by means of a wand 54 and intake line 38 which includes an accordion pump 36 to prime the line and protect against air lock. The output of the equalized is provided to a adder to combine the equalized signal with the error signal produced by the phase detector. The sheet-metal layer surface area in the partial volume is reduced by 10 to 80% by the holes as compared to a sheet-metal layer without holes.