In this communication, we present a coplanar strip (CPS) line-fed series dipole array antenna for high-gain realization. Printed dipoles of the same size are connected using the CPS line, and impedance matching is achieved with an integrated balun. The gain of the designed array antenna is increased by approximately 2.6 dB as the number of dipoles is doubled. Unlike the conventional endfire array, which has no gain increment beyond a certain number of radiation elements, the gain of the proposed array antenna continuously increases in proportion to the number of dipoles. A CPS line-fed series array antenna with 32 dipole elements was fabricated and evaluated. The measured gain of the 32 dipole array antenna at a center frequency of 15 GHz was 17.4 dBi, the measured −10 dB impedance bandwidth was 9.1-21.6 GHz, and the measured 3 dB gain bandwidth was 13.4-17.4 GHz. The dimensions of the designed dipole array antenna are 0.7 λo×13.2 λo×0.0063 λo, where λo is the free space wavelength at the center frequency.
Manuscript received January 4, 2020; revised December 29, 2020; accepted January 12, 2021. Date of publication February 24, 2021; date of current version August 4, 2021. This work was supported in part by the National Research Foundation of Korea (NRF) through the Korean Government (MSIT) under Grant 2018R1D1A1A02086071 and in part by the \u201cHuman Resources Program in Energy Technology\u201d of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade Industry and Energy, South Korea under Project 20184030292220. (Corresponding author: Ikmo Park.) The authors are with the Department of Electrical and Computer Engineering, Ajou University, Suwon 16499, South Korea (e-mail: wanghs90@ gmail.com; ipark@ajou.ac.kr).
