
2/17

Content

Introduction

IMT-Advanced and its Features

Technologies consideration for IMT-Advanced

Reconfigurable Bandpass Filter

Reconfigurable circuit concept

Designing of reconfigurable Filter

Simulation Results

Future Works

References


3/17

INTRODUCTION

International Mobile Telecommunications - Advanced(IMT-Advanced)

4G Radio Access Technology.

Defined by ITU for mobile communication systems Capabilities which go further than that of IMT-2000.

IMT-2000 support data rate around 30 Mbps. We need higherdata rate.


4/17

Features of IMT-Advanced

100 Mbit/s for high mobility

1 Gbit/s for low mobility

Interoperability with existing wireless standards

Scalable channel bandwidth 520 MHz, optionally up to 40 MHz

Peak link spectral efficiency of 15 bit/s/Hz in the downlink,

6.75 bit/s/Hz in the uplink

Offer high quality of service for multimedia support

Spectrum bands

2.32.4 GHz band 3.44.2GHz band

4.44.99GHz band.


5/17

Technologies Considered

Wider-band transmission and spectrum sharing Using Carrier Aggregation

Coordinated multi-point transmission A. The terminals are not aware of the transmission originating from multiple, geographically separated

points.

B. terminals provide channel-status feedback to

the network for all downlink channels visibleto a particular terminal

C. The channel-status reporting is the same as in approach B. However, unlike approach B, theterminals are provided with knowledge about the exact coordinated transmission.

Multi-antenna solutions

Spatial multiplexing Beam-forming

Relays and RepeatersSimply amplify and forward the received analog signals

The intermediate node may also decode and re-encode any received data prior to forwarding


6/17

Filter

Reconfigurable

Behavior can be changed by reconfiguration.

Capacity to change

An individual radiator fundamental operating characteristic

Operating frequency

Impedance Bandwidth

Needs of reconfigurable filter Support multiple system standards.

Multiple filters occupy large surface area so it is highly integrated

Low-Power

Low Cost

Low insertion loss


7/17

Bandpass Filter

A band-pass filter is a device that passes frequencies within a certainrange and rejects (attenuates) frequencies outside that range.


8/17

Reconfigurable Circuit concept

A network prototype suitable for reconfigurable filters

ABCD-parameter for above prototype is as follow


9/17

After applying the s=1/s transformation to preceding equation

According to Richards transformation

S= j tan ( (/2) *(f/fr) )

where,

f= Real frequency variablefr= Commensurate frequency = 2.75 * lower frequency.


10/17

Circuit concept


11/17

Designing

50 50

Open circuit structure

All impedance values are in .


12/17

Designing

50 50

Short circuit structure

All impedance values are in .


13/17

Simulation Results

666.666

MHz

1333.333

MHz

Centre Frequency

1 GHz

Result for open circuit structure


14/17

Simulation Results

1416.667

MHz

2083.334 MHz

Centre frequency

1.75 GHz

Result for short circuit structure


15/17

Future Works

Implementation for IMT-Advanced Band.

Implementation of RF switches.

Fabrication.


16/17

References

1. Wael M. Fathelbab, Senior Member, IEEE, A New Class of Recongurable Microwave

Bandpass Filters IEEE Trans. on circuits and systemsii: Express brief, vol. 55, no. 3,

March 2008.

2. I.C. Hunter and J. D. Rhodes, Electronically tunable microwave band-pass lters, IEEE

Trans. Microw. Theory Tech. , vol. MTT-30, no. 9,pp. 13541360, Sep. 1982.

3. H. J. Orchard and G. C. Temes, Filter design using transformed vari-able, IEEE Trans.Circuit Theory , vol. CT-15, no. 4, pp. 385408, Dec.1968.

4. J. A. G. Malherbe, Microwave Transmission Line Filters . Natick,MA: Artech House, 1979.

5. Stefan Parkvall, Erik Dahlman, Anders Furuskr, Ylva Jading, Magnus Olsson, Stefan

Wnstedt, Kambiz Zangi, LTE-Advanced Evolving LTE towards IMT-Advanced-

Ericsson Research 16480 Stockholm, Sweden [email protected]

6. www.3gpp.com/LTE-Advanced.7. Ian F. Akyildiz, David M. Gutierrez-Estevez, Elias Chavarria Reyes ,The evolution to 4G

cellular systems: LTE-Advanced.-Broadband Wireless Networking Laboratory, School of

Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA30332,

United States


17/17

Thank You

Documents

Filter for IMT-Advanced Network