This document proposes a switchable directional antenna system for ultra-wideband Internet of Things (IoT) applications. It consists of a DW1000 RF transceiver, ARM processor, RF switching network, and four directional antennas arranged to cover 360 degrees. By enabling control of the antenna direction, this system aims to reduce channel contention, increase communication range and throughput, and improve energy efficiency for low-power wireless networks. Measurements of the prototype show antenna gains between 2.7-3.4 dB and beamwidths of 88-108 degrees for each sector. This switchable directional antenna approach could provide advantages over narrowband IoT systems by mitigating multipath fading and cross-technology interference through UWB's

1. Switchable directional antenna
system for uwb-based iOt
applications
By,
M.KARNAKAR
Reg.17304016

2. INDEX
 Introduction
 Advantages of directional antenna
 Internet of things(IoT)
 Applications
 Problems in narrow band systems
 Advantages of UWB
 Switchable directional antenna for UWB-IOT applications
 prototype
 Low-cost planner antenna
 Antenna patterns, measurements
 RF switching network
 conclusion
 Next steps
 References

3. INTRODUCTION
By enabling control of direction of power radiation of directional antenna,
 Reduce channel contention
 Increase the communication range of nodes
Consequently ,
 Increase the throughput
 Energy efficiency of low power wire less networks

4. IOT APPLICATIONS
 Operated in narrow band
 Operate in globally available 2.4GHz Band
 Moved to sub-1GHz
 LoRA
 SIGFOX

5. IOT APPLICATIONS

6. PROBLEMS IN IOT APPLICATIONS WITH NB
 Multipath fading
 Cross –technology interference

7.  higher immunity to multi path fading
 An improved interference mitigation
 Very good time domain resolution for accurate localization and tracking
ADVANTAGES OF UWB

8. SWITCHABLE DIRECTIONAL ANTENNA
FOR UWB-IOT APPLICATIONS

9. PROTOTYPE SYSTEM
Consist of
 DW1000 RF transceiver
 ARM Cortex M3 Host processor
 RF switching network
 4 directional antenna

10. DW1000 TRANSCEIVER

12. RF SWITCHING NETWORK
 Ultra CMOS RF switch from peregrine semiconductor
 High speed switching 5 micro sec
 Consumes lower current 90 micro amp
 No insertion loss at 4.5-8GHz
 1-2dB loss

13. RF SWITCHES

14. PLANER ANTENNA
 Four antennas arranged in 4directions
 Angular shift 90 degrees
 Covers 360 degrees

15. ANTENNA PATTERNS, MEASUREMENTS
Gain[dB] HPBW[degree]
Sector(blue) 3.068dB 88
Sector(purple) 3.380 dB 100
Sector(orange) 2.742 dB 98
Sector(yellow) 2.922 dB 108

16. ANTENNA PATTERNS

17. NEXT STEPS

18. REFERENCES
 [1] deca wave ltd.DW1000 datasheet
 [2] low cost directional antenna in 2.4GHz IEEE 802.15.4
 [3]RF switching technologies