KRISHNA ENGINEERING COLLEGE

SUBMITTED BY :

VIKAS YADAV(1116131179)SIDDHARTHA SHARMA(1116131188)Mohd . ZEESHAN SIDDIQUI(1116131097)

MAJOR PROJECT NAME

PROJECT GUIDE :

Mrs. RENU DUBEY

“A new aperture coupled microstrip slot antenna”

CONTENTS

The HFSS desktop Analysis Flow Design Flow Triangular Microstrip Antenna HFSS Model 1 HFSS Model 2 Applications References

The HFSS Desktop

ANALYSIS FLOW

It is instructive to examine antenna analysis using HFSS as a process and examine its “flow”.

The following steps comprise such a flow (a) Design capture (b) Analysis (c) Post processing In more detail:- (a) Create a parametric solid model for the geometry (b) Specify the material properties (c) Specify boundary conditions and excitations (d) Specify analysis and frequency sweep setup information (e) Perform the analysis (f) Examine the results (g) Examine the fields

DESIGN FLOW Portion of this analysis flow may be repeated in an iterative loop

as the antenna is modified to achieve desired performance specification. Let’s term this as “design flow”.

This is accomplished conveniently with automation provide HFSS in the form of:-

(a) Parametric sweeps(b) Optimization(c) Sensitivity analysis(d) Statistical analysis HFSS supports these capabilities.(a) An inherently parametric design environment.(b) Management of parametric solution results.(c) Display of parametric geometry, fields and results. (d) Export of parametric results for use in circuit analysis.

TRIANGULAR MICROSTRIP ANTENNA

HFSS Model

HFSS Model

APPLICATIONS

Extensively used in military.

Government security systems.

Direct broadcast television.

Wireless LANs.

GPS system.

Mobile satellite communication.

Missiles and telemetry.

REFERENCES

C. A. Balanis , Antenna Theory Analysis and Design , 3rd ed. New York: Wiley, 1997.

X . H. Yang and L. Shafai, Characteristics of micro strip antennas with various radiation patches and coupling apertures, IEEE Trans. Antennas Propagation, vol. 43,no. 1, pp. 72-78, Jan. 1995.

IEEE Transaction on antennas and propagation ,vol. 53, no. 9, Sept, 2005.

L. Sullivan and D. H. Schauber,” Analysis of an aperture coupled antenna,” IEEE Trans. Antennas propagation, vol. AP-34, NO. 8,PP. 977-984, Aug,1986.

Y. Yashimura, “ A micro strip slot antenna” IEEE Trans. Antennas propagation, vol. AP-29,pp.2—24, Jan 1981.

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APERTURE COUPLED DESIGN

Proposed for microstrip slot antennas to improve their radiation performance.

Increases the bandwidth of the antenna.

Couples the patch antenna with micro strip line through an aperture.

The coupling between two or more micro strip antenna elements can be taken into account easily using full-wave analyses.

MICROSTRIP SLOT ANTENNA

Microstrip antenna received considerable attention starting in 1970’s.

Low profile antenna.

Simple and inexpensive to manufacture.

Versatile in terms of resonant frequency ,polarization ,pattern and impedance.

Similar to planar and non-planar surfaces.

Major operational disadvantages of micro strip antennas are their low efficiency, Low power ,high quality factor.

However, there are methods by which efficiency and bandwidth can increase upto 90 % and 35% respectively.

STRUCTURE OF MICROSTRIP ANTENNA

In its most basic form , a microstrip antenna consists of a radiating patch on one.

Side of a dielectric substrate which has a ground plane on the other side.

It consists of a very thin metallic strip above a ground plane.

Thin substrates with higher dielectric constants are desirable for microwave circuitry.

Since, microstrip antennas are often integrated with other microwave circuitry.

Radiating patch may be square,rectangular,dipole, circular,triangular,elliptical or any other configuration.

Square, rectangular, dipole(strip) and circular are the most common because of ease of analysis.

Microstrip dipoles are attractive because they inherently posses a large bandwidth and occupy less space.

ADVANTAGES

Low fabrication cost.

High Performance.

Light weight and low volume.

Capable of dual and triple frequency operations.

Supports both, linear as well as circular polarization.

Mechanically robust when mounted on rigid surfaces.

DISADVANTAGES

Low efficiency.

Lower gain.

Spurious feed radiation.

Low power handling capacity.

Excitation of surface waves.

Inheretenly low impedance bandwidth.