shorting post

EFFECT OF DIMENSIONS OF RMSA WITH A SINGLE SHORTING POST & EFFECT OF THE POSITION OF THE

SINGLE SHORTING POSTSWAPNIL BANGERA

ADVANCED ANTENNA & ARRAYSME-EXTC

OVERVIEW

• MICROSTRIP ANTENNA (MSA)• SHORTING• EFFECT OF DIMENSIONS• EFFECT OF POSITION• CONCLUSION

MICROSTRIP ANTENNA

• IN WIRELESS COMMUNICATION, ANTENNAS ARE KEY COMPONENTS.• THEY MUST BE SMALL, LOW PROFILE WITH MINIMAL PROCESSING COSTS.• LOW EFFICIENCY AND NARROW BANDWIDTH.• THE FLEXIBILITY AFFORDED BY MICROSTRIP ANTENNA TECHNOLOGY HAS LED

TO A WIDE VARIETY OF DESIGN AND TECHNIQUES.• THE BANDWIDTH OF THE MICROSTRIP ANTENNA CAN BE INCREASED USING

VARIOUS TECHNIQUES.

SHORTING

• THE OPERATING FREQUENCY OF MSA IS HIGHLY DEPENDENT ON ITS DIMENSIONS.

• FOR LOWER FREQUENCIES THE SIZE OF THE CONVENTIONAL MSA’S IS LARGE.

• A COMMON TECHNIQUE TO REDUCE THE OVERALL SIZE OF A MICROSTRIP PATCH ANTENNA IS SHORTING.

• SHORTING IS DONE BY TERMINATING ONE OF THE RADIATING EDGES WITH A SHORT CIRCUIT.

• THE SHORT CIRCUIT CAN BE IN THE FORM OF A METAL CLAMP OR A PIN.

SHORTING

EFFECT OF DIMENSION

• CONSIDER A RECTANGULAR RMSA WITH A SINGLE SHORTING POST IN THE MIDDLE OF THE EDGE ALONG THE WIDTH.

• THE LENGTH (L=3.3) IS FIXED AND THE WIDTH (W) IS VARIED.• THE DIAMETER OF THE SHORTING POST IS 0.06.

Width(cm) X(cm) f(Ghz) VSWR BW %0.5 0.40 2.178 1.14 2.11.0 0.20 1.688 1.29 1.21.5 0.13 1.392 1.22 0.92.0 0.10 1.196 1.08 0.82.5 0.10 1.054 1.34 0.73.0 0.08 0.946 1.21 0.63.5 0.08 0.860 1.25 0.64 0.08 0.790 1.35 0.5

𝑓 =3

4 (𝐿𝑒+𝑊 𝑒

2)√𝜖𝑟

EFFECT OF POSITION

• WHEN THE SINGLE SHORTED RMSA IS FABRICATED ON A HIGHER DIELECTRIC CONSTANT SUBSTRATE, ITS RESONANCE FREQUENCY REDUCES.

• THE RESONANCE FREQUENCY REDUCES FURTHER WHEN THE SHORTING POST IS PLACED AT ONE CORNER OF THE RMSA.

• VOLTAGE DISTRIBUTION VARIES FROM ZERO AT THE SHORT LOCATION TO A MAXIMUM VALUE AT THE DIAGONALLY OPPOSITE CORNER.

W(cm) L(cm) x(cm) f(Mhz) BW %3.0 6.5 0.16 434 1.154.0 6.0 0.16 427 1.215.0 5.5 0.16 423 1.236.0 5.0 0.23 423 1.237.0 4.5 0.26 423 1.248.0 4.0 0.33 423 1.26

A SINGLE SHORT AT THE CORNER OF THE RMSA RESULTS IN A MOST COMPACT CONFIGURATION

CONCLUSION

• A REVIEW OF SHORTING POST LOADED MICROSTRIP ANTENNA AS WELL AS NEED OF THE SHORTING POST LOADED MICROSTRIP ANTENNA IS PRESENTED.

• THE SIZE OF THE MICROSTRIP PATCH CAN BE REDUCED SIGNIFICANTLY BY SHORTING POST.

• THE SIZE CAN BE REDUCED FURTHER BY POSITIONING THE SHORTING POST AT THE CORNER OF THE EDGE OF MICROSTRIP ANTENNA.

THANK YOU!PRESENTED BY:

SWAPNIL BANGERAME-EXTC