Abstract
This paper presents an ultralow profile, low passive intermodulation (PIM), and super-wideband in-building ceiling mount antenna that covers both the cellular and public safety ultra high frequency (UHF) band for distributed antenna system (DAS) applications. The proposed antenna design utilizes a modified 2-D planar discone design concept that is miniaturized to fit into a small disc-shaped radome. The 2-D planar discone has an elliptical-shaped disc monopole and a bell-shaped ground plane, a stub at the shorting path, with asymmetrical structure and an additional proximity coupling patch to maximize the available electrical path to support the 350 MHz band range. The proposed design maximizes the radome area with a reduction of about 62% compared to similar concept type antennas. Besides, the proposed design exhibits an improved radiation pattern with null reduction compared to a typical dipole/monopole when lies at the horizontal plane. A prototype was manufactured to demonstrate the antenna performance. The VSWR and radiation pattern results agreed with the simulated results. The proposed antenna achieves a band ratio of 28.57:1 while covering a frequency range of 350–10000 MHz. The measured passive intermodulation levels are better than −150 dBc (2 × 20 Watts) for 350, 700 and 1920 MHz bands.
Highlights
The evolution of mobile wireless communication systems has shifted its focus from voice to mobile broadband applications that seamlessly support high data streaming, high quality of experience, ultra-low latency and high throughput anywhere and anytime
In [13,31], an asymmetrical dipole is with reduced null azimuth radiation pattern compared to a typical dipole but only supports the standard frequency range for long term evolution (LTE) band of 698–3800 MHz
The ground coupling patch outline partially follows the shape of the ground plane, especially near to the transition between the top radiating element and the ground plane to ensure the impact on the impedance of the high band is minimum
Summary
The evolution of mobile wireless communication systems has shifted its focus from voice to mobile broadband applications that seamlessly support high data streaming, high quality of experience, ultra-low latency and high throughput anywhere and anytime. These antennas still have limitations in terms of frequency range coverage that not able to fulfil the additional mobile LTE band. In [13,31], an asymmetrical dipole is with reduced null azimuth radiation pattern compared to a typical dipole but only supports the standard frequency range for long term evolution (LTE) band of 698–3800 MHz. In this paper, a novel modified 2D planar discone-like antenna that meets the ULP requirement for indoor DAS is presented. Several iterations of high-quality prototypes were produced and experimentally tested for performance verification
Sign-in/Register to view highlights & summary 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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
