THE DUAL BAND 5G ANTENNA

Introduction

5G uses low, mid and high frequency bands for high data rates

Mid band of 1-6 GHz chosen for good propagation compared to

mmWave

Compact microstrip antennas suitable for 5G mobile devices

Antenna Design

Compact square slot patch antenna with partial ground plane

Meander line inside slot for dual band response

Bar along meander line introduces notch in undesired band

Results

Dual band from 3.34-4.25 GHz and 4.65-7.07 GHz

Covers n77, n78, n79 mid bands allocated for 5G

Stable gain of 2-3 dBi across bands

High radiation efficiency >80%

Analysis

Square patch provides base resonance

Meander line generates additional resonance

Bar filters out unwanted frequencies

Compact size due to slot, partial ground, meander line

Conclusion

Proposed antenna covers all key 5G mid bands

Compact size and low profile suitable for mobile devices

Stable gain and high efficiency achieved

Meander line technique enables miniaturization

Key Highlights

Dual band resonance realized in compact planar geometry

Meander line and slotting techniques used for size reduction

Notch introduction filters unwanted bands from wide response

Covers all important 5G frequency allocations in sub-6 GHz

DISTRIBUTED RAMAN AMPLIFIERS

Introduction

Distributed Raman amplifiers (DRAs) enable long-haul fiber optic

transmission

Provides high capacity using dense wavelength division multiplexing

Operates over low-loss bands like O, E, S, C, L

Raman Scattering

Pump photons excite fiber molecules to higher vibration state

Excited molecules emit lower energy Stokes photons

Results in Raman gain for signals at lower frequencies than pump

DRA Modeling

Based on coupled equations for pump and signal power variations

Considers Raman gain coefficient, attenuation, effective length

Used to analyze gain and output power in different bands

Results

Highest gain variation in O-band due to amorphous fiber

characteristics

Good gain flattening in C and L bands around 1550nm

Peak gain in E-band at 1384nm aligning pump and Stokes

frequencies

Overall, C and L bands give best performance for DRA

Conclusion

DRA provides distributed amplification over fiber length

Gain spectrum depends on fiber composition and pump parameters

C and L bands most suitable for flattened gain

Further research needed on nonlinear effects in multi-channel DRA

Key Highlights

Raman scattering enables distributed amplification in optical fibers

Mathematical modeling gives insights into gain characteristics

Low loss C and L bands exhibit good flat gain with DRA

Essential for expanding capacity of optical communication systems

Students also viewed