Abstract
A uniplanar microstrip antenna (MSA) is proposed with a simple feed to achieve the endfire radiation pattern with less size, improved gain, and front-to-back ratio (F/B) at 2.45 GHz. The proposed antenna is realized using the concept of MSA and Yagi–Uda antenna. Effects of various antenna parameters are analyzed on the reflection coefficient and gain. Optimized uniplanar MSA provides 6.7 dBi gain with F/B of 19 dB at 2.45 GHz. The designed antenna is uniplanar with the size of $0.47\lambda _{\mathrm {o}} \times 0.13\lambda _{\mathrm {o}}$ . A director element is added to improve the gain of the antenna to 8.2 dBi with F/B of better than 18 dB. The size of the uniplanar MSA with the director is $0.47\lambda _{\mathrm {o}} \times 0.36\lambda _{\mathrm {o}}$ . The experimental results of the fabricated antenna are in good agreement with the simulated results.
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