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In this article, a chipless RFID reader antenna based on a modified rectangular‐resonator is presented. The reader antenna is fabricated and measured to validate multiple narrowband resonance behavior. The measurement results show that the reader antenna can detect 11‐bit multi‐frequency coded chipless tag and depict gains of 4.7 and 5.2 dBi at 0.58 and 2.4 GHz, respectively. The cubic interpolation approach as a signal processing technique is applied at the reader end to eliminate the unnecessary drops at the measurement. Further study of Chu and Mclean's fundamental limit demonstrates that the physical dimensions of the proposed antenna and the radiation characteristics fulfilling the limitations. The multiple narrow‐band responses of the reader antenna can be suitable to detect multi‐bit tags which are of high demand because a multibit tag can be used for multiple frequency applications for hassle …