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In this article, a compact multiservice antenna (MSA) is presented for sensing and communication using a reconfigurable complementary spiral resonator. A three turns complementary spiral resonator (3-CSR) is inserted in the ground plane of a modified patch antenna to create a miniaturized structure. Two positive-intrinsic-negative (p-i-n) diodes (D1 and D2) are also integrated with the 3-CSR to achieve frequency reconfiguration. The proposed structure operates in three different modes, i.e., dual-band joint communication and sensing antenna (JCASA), dual-band antenna, and single-band antenna. The required mode can be selected by changing the state of the p-i-n diodes. In mode-1, the first band (0.95–0.97 GHz) of the antenna is dedicated to sensing by using frequency-domain reflectometry (FDR), while the second band (1.53–1.56 GHz) is allocated to communication. The sensing ability of the proposed …