Abstract
This paper presents a low profile dual polarized directional antenna composed of loop and dipole arrays mounted on a ground plane with each loops and dipoles being fed independently. Each loop antenna is paired with a reflector while each dipole antenna is paired with a director and a reflector. The proposed antenna is intended for an indoor base station (BS) with resonance frequency of 2.4 GHz and capable of producing four orthogonal directional pattern with downward elevation angle equals to 30°; and half power bandwidth (HPBW) less than 80°; in both vertical and horizontal polarization. The reflection characteristics of the loop and dipole arrays are less than -10 dB and the mutual coupling between the vertical and horizontal polarization elements is nearly less than -20 dB. In later progress, the dipole antenna was substituted with printed dipole antenna to achieve a better performance. Both the calculated and measured results demonstrated that the desired radiation patterns were achieved, and the measured results agreed well with the calculated ones. Consequently, a low profile antenna with a thickness of 0.16 λ (20 mm) having the expected radiation pattern is successfully designed.
Highlights
The communication systems today is facing an ever-increasing demand on providing a wireless system that is the capable of enabling higher voice and data rates while at the same times supporting higher capacity users
We present a novel low profile directional antenna intended for an indoor base station (BS)
We have evaluated a BS MIMO antenna mounted on the ceiling for downlink transmission and demonstrated that directive radiation patterns with a tilted angle in downward direction are effective for enhancing signal-to-noise ratio (SNR) and channel capacity compared with a sleeve antenna configuration [18]
Summary
The communication systems today is facing an ever-increasing demand on providing a wireless system that is the capable of enabling higher voice and data rates while at the same times supporting higher capacity users. In multi antennas environment, optimizing the radiation pattern and polarization are very effective especially in enhancing the channel capacity. One of the methods to address this issue is by using a matching network [12] This method will cease to unnecessary when we can design an antenna that is small enough in size without reducing the channel capacity by effectively utilizing the polarization [13]-[17]. We have evaluated a BS MIMO antenna mounted on the ceiling for downlink transmission and demonstrated that directive radiation patterns with a tilted angle in downward direction are effective for enhancing signal-to-noise ratio (SNR) and channel capacity compared with a sleeve antenna configuration [18]. In this paper we explain the process and present the summary of the structure, operation principle and antenna characteristic performance of the proposed antenna
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
