The design of linearly polarized, flexible, multi-band decagon ring monopole antenna is proposed. The decagon ring monopole antenna incorporates a decagon ring having a thickness of 5 mm encircling a chamfered patch to generate multiband linear polarized waves. These radiators are excited by coplanar waveguide (CPW) fed based technique to induce two resonances at 2.20 GHz and 4.10 GHz covering bandwidth requirement of Global System for Mobile (GSM) 1800, Long Term Evolution (LTE) 2300/2600, Fifth Generation (5G) and WLAN bands. The simulated outcomes confirm the-10 dB impedance bandwidth of 48.84% (1.64-2.70 GHz) and 43.01% (3.65-5.65 GHz) at resonating frequency of 2.20 GHz and 4.10 GHz, respectively. Further, the bending analysis validates that the impedance matching and radiation performance of decagon ring antenna have minimal impact on the operating bands.