This paper presents a comprehensive review of symmetrically shaped antennas in terms of antenna size, dielectric materials, resonating band, peak gain, radiation pattern, simulating tools, and their applications. In this article, flower shape, leaf shape, tree shape, fan shape, Pi shape, butterfly shape, bat shape, wearable, multiband, monopole, and fractal antennas are discussed. Further, a survey of previously reported bandwidth enhancement techniques of microstrip patch antenna like introduction of thick and lower permittivity substrate, multilayer substrate, parasitic elements, slots and notches, shorting wall, shorting pin, defected ground structure, metamaterial-based split ring resonator structure, fractal geometry, and composite right-hand/left-handed transmission line approach is presented. The physics of these techniques has been discussed in detail which is supported by circuit theory model approach.

本文从天线尺寸、电介质材料、谐振频带、峰值增益、辐射方向图、仿真工具及其应用等方面对对称形状的天线进行了全面回顾。在本文中，讨论了花形、叶子形、树形、扇形、Pi 形、蝴蝶形、蝙蝠形、可穿戴、多频带、单极和分形天线。此外，对先前报道的微带贴片天线带宽增强技术的调查，如引入厚和低介电常数基板、多层基板、寄生元件、槽和槽口、短路壁、短路针、缺陷接地结构、基于超材料的裂环谐振器结构，分形几何和复合右手/左手传输线方法提出。