Year-end Sale % OFF 
Abstract
A compact pattern reconfigurable antenna with four radiation patterns is proposed for sub-GHz IoT applications. The antenna has two functional modes; Mode I has three uncorrelated patterns, while Mode II has electric and magnetic omnidirectional patterns. The resonant frequency of the antenna is 868 MHz with measured overlapped −6 dB impedance-bandwidths of 22 MHz and 20 MHz for Mode I and Mode II, respectively. The antenna is integrated in an $80\times 55$ mm2 terminal. The radiating elements consist of two meandered slots and one meandered monopole. Four pattern configurations are obtained with an average peak gain of 0 dBi, and an average radiation efficiency of 43.3%. Two of the patterns are with 5 dB directivity, and the other two are omnidirectional patterns. Pattern reconfigurability is achieved using four PIN diodes. The antenna is fabricated on a low-cost FR-4 substrate. By removing FR-4 material inside the slots, slots’ radiation efficiencies were improved by 2.25 dB.
Highlights
T HE NUMBER of devices connected to the Internet is increasing rapidly [1]
It is important to design antennas working for Internet of Things (IoT) applications to serve this huge number of connected devices to the network
Comparing IoT with mobile phone technology, the wireless link robustness must be enforced in IoT applications, as it may not be possible for the object to move to improve its network level connection
Summary
T HE NUMBER of devices connected to the Internet is increasing rapidly [1]. These devices will be controlled or monitored wirelessly using the Internet of Things (IoT) technology. This proposed antenna in [3] has nine different radiation patterns with gains around 5 dB and with good efficiencies It uses 8 PIN diodes, the frequency of operation is relatively high, only one linear polarization is achieved, and the antenna size is bulky. The proposed antenna in this article achieved four different radiation patterns with good radiation gains, two linear polarizations and a very compact size at 868 MHz. The proposed antenna uses only four PIN diodes, and one lossy substrate FR4. The simulated and measured |S11| results for the four pattern configurations are shown, where it can be seen that the resonant frequency is at 0.87 GHz for TABLE 2.
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.
