Relationship Between Co-Axial Probe Feed and Inset Feed in Rectangular Microstrip Patch

Relationship Between Co-Axial Probe Feed and Inset Feed in Rectangular Microstrip Patch

Ravi Kant Prasad (Bundelkhand Institute of Engineering and Technology Jhansi, India), D. K. Srivastava (Bundelkhand Institute of Engineering and Technology Jhansi, India), Rishabh Kumar Baudh (Bundelkhand Institute of Engineering and Technology Jhansi, India) and J. P. Saini (Bundelkhand Institute of Engineering and Technology Jhansi, India)
DOI: 10.4018/978-1-5225-9683-7.ch013

Abstract

In this chapter, an equation is obtained using curve fit formula that shows the relationship between the simulated co-axial probe feed distance and theoretically inset feed distance in rectangular microstrip patch antenna. The simulation process is performed using IE3D simulation software tool and theoretical calculation performed by the cavity model. Using this equation, one can avoid hit and trial for getting simulated co-axial feed distance by knowing theoretically inset feed distance. A ratio also has been developed between co-axial probe feed and inset probe feed.
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Measurement Techniques

In rectangular patch antenna the co-axial probe feed and the microstrip line inset feed has been used for impedance matching and measurements. The glass epoxy FR4 substrate having thickness, dielectric constant and loss tangent of 1.6 mm, 4.4 and 0.01respectively has been used.

The range of frequency for which relationship between both feed positions has been developed lies between 2 to 6 GHz. The rectangular patch length and width, for particular frequency can be calculated. The length and width are the two primary parameters that are needed in design of the rectangular patch antenna. The width (W) of rectangular patch antenna is calculated as follows (Constantine and Balanis, 2005)

978-1-5225-9683-7.ch013.m01
Where C = Light’s speed (3x1011 mm/s), ƒ = Antenna design frequency, εr = Dielectric constant of substrate

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