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This paper focuses on antenna for harvesting energy from a dedicated transmitter. The potential novel quasi-Yagi antenna with semi-bowtie driven element can be used as part of rectenna due to its characteristic of having directional properties and considerably wide bandwidth covering the Industrial, Scientific, and Medical (ISM) band consists of 863-870 MHz band and 902-928 MHz band. The modified quasi-Yagi is designed on a low-cost FR4 substrate with a physical size of 130 x 100 mm2 equivalent to 0.35λo x 0.27λo. The antenna has a peak directivity of 2.7 dBi and peak gain of 2.2 dBi in the targeted unlicensed bands with bandwidth of 14.4% for the range between 0.820-0.944 GHz. The shift in the resonant frequency is achieved by varying the phase shifter length and maintaining the same width for consistency. The antenna's operating frequency range varies between 0.8 GHz until 1 GHz which is less than 1 GHz by using semi-bowtie as driven element with a specific 7.22⸰ flare angle. The phase shift arm length of the antenna has been studied and simulated by using Computer Simulation Technology (CST) software and verified by using analytical equations. The simulated results are in accordance with the results obtained using analytical method. The same antenna geometry except variation in phase shifter arm length has been used throughout the study for consistency. The proposed antenna is promising to be used as part of rectenna for powering power management chip such as BQ25570 in a smart house environment operating at the indicated ISM bands.

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