Cavity Field Modulation With Modulating Circular Patch Antenna Surface: A Key to Realize Reduced Horizontal Radiation and Omni-Present Improvement in Radiation Performance

Although, the circular microstrip antennas are the most popular tiny planar antennas, increased horizontal radiation in the E plane imposes a severe limitation in case of modern applications such as array or 5G MIMO configurations. Further, low broadside gain, high H plane cross polar radiation reduces the efficiency of antenna for different wireless applications. Therefore, in order to cope up with the ubiquitous development of tiny and efficient wireless communication devices, antenna structure is to be judiciously modified. Symmetrical modification on patch structure by loading a pair of thin strip on circular patch with shorting posts germinates a modified circular patch with excellent radiation performances. High gain of around 9.2 dBi with excellent polarization purity of 27 dB has been achieved with such structure. Further, an excellent radiation characteristic of reduced horizontal radiation (21 dB down than peak co-polar gain) with 92% efficiency has been revealed from the present antenna. A clear physical insight in to the observed characteristics has been thoroughly documented. The antenna is simple, easy to manufacture and measured results are in close agreement with simulated results.