Graphical experimental data in the form of passive receiving scanning beam patterns is presented for several high resolution acoustic lens–acoustic filter plate combinations. They show the comparative properties of various types of flat and curved filter plates when used in such acoustic antennas. Experimental data relating the achieved frequency‐independent constant beamwidth of the several lens–filter plate combinations to the governing parameters of the filter plates are summarized for empirical design purposes. The basic experiments reported were conducted over the frequency range from 25 to 1000 kHz but the results can be scaled to any frequency range of the corresponding scaled width. As a receiving antenna, the acoustic lens–acoustic filter plate device eliminates the distortion imposed on the spectral content of a received multifrequency signal as a function of angle‐off‐boresight which is inherent in the use of conventional variable beamwidth directional receiving antennas.