Abstract
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.
Highlights
Circular microstrip antenna (CMA) on dielectric substrate is well known tiny antenna and the most popular genre of printed antennas it suffers from poor gain, low efficiency and poor polarization purity (PP)
Another major but less investigated shortcoming of such CMA is a strong radiation fields along horizontal direction i.e., along ground plane. This radiation is undeniably undesirable for many applications like 5G MIMO, array [2]-[4] configuration or in vector sensors [5],[6]
All these reported works do not deal with the said significant issue like suppression of horizontal radiation of patch antenna at its E plane which is usually only 8-10 dB down than peak co-polar gain
Summary
Circular microstrip antenna (CMA) on dielectric substrate is well known tiny antenna and the most popular genre of printed antennas it suffers from poor gain, low efficiency and poor polarization purity (PP). Efforts to achieve high polarization purity have been reported by modifying the patch geometry [15], [16], use of shorting metal patch [17] or using of DGS [18] in which maximum CP-XP isolation of approximately 22 dB to 23 dB is achieved but with no improvement in gain profile All these reported works do not deal with the said significant issue like suppression of horizontal radiation of patch antenna at its E plane which is usually only 8-10 dB down than peak co-polar gain. The novelties of the present antenna may be listed as: (i) Judicious choice of modification in circular patch geometry along with few shorting vias make the structure simple but can yield the improvement in complete radiation performances such as high co-polar broadside gain and efficiency, excellent PP along with reduction in horizontal radiation. Around 22% reduction in patch area is observed in comparison to surface wave eliminated antenna. (iii) To the best of authors knowledge, this is the first report where, all the radiation parameters have been improved concurrently along with reduction in horizontal radiation. (iv) The antenna has been thoroughly analyzed to provide readers a clear physical insight
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