II. Experimental Investigation
Our reported structure is shown in the Fig.1. At the first, we
attempt to design a coaxial feed square patch antenna and
optimized it for desired performance. After that, we have tried
to optimize the size of the conical horn and its placement
with respect to the microstrip patch antenna in order to
achieve maximum possible gain. A coaxial feed microstrip
patch antenna, with dimensions 7mmx7mm is designed on
the substrate of size, 30mmx30mmx1mm. A conical horn of
slant length 3 mm is selected for this purpose. We know that
the practical waveguide have larger dimension greater than a
half wavelength, to allow wave propagation, but smaller than
a wavelength, to suppress higher order modes which can
interfere with low loss transmission. For more gain a larger
aperture is desirable, but a larger waveguide is not. However,
if the waveguide size is slowly expended, or tapered in to a
larger aperture, than more gain is achieved while preventing
undesired modes from reaching the waveguide.
In this structure we used patch antenna as a radiator and also a
feed to the conical horn improves the electric fields distribution
over the aperture along the H-plane thus becomes relatively
uniform which improves the directivity
II. Experimental Investigation
Our reported structure is shown in the Fig.1. At the first, we
attempt to design a coaxial feed square patch antenna and
optimized it for desired performance. After that, we have tried
to optimize the size of the conical horn and its placement
with respect to the microstrip patch antenna in order to
achieve maximum possible gain. A coaxial feed microstrip
patch antenna, with dimensions 7mmx7mm is designed on
the substrate of size, 30mmx30mmx1mm. A conical horn of
slant length 3 mm is selected for this purpose. We know that
the practical waveguide have larger dimension greater than a
half wavelength, to allow wave propagation, but smaller than
a wavelength, to suppress higher order modes which can
interfere with low loss transmission. For more gain a larger
aperture is desirable, but a larger waveguide is not. However,
if the waveguide size is slowly expended, or tapered in to a
larger aperture, than more gain is achieved while preventing
undesired modes from reaching the waveguide.
In this structure we used patch antenna as a radiator and also a
feed to the conical horn improves the electric fields distribution
over the aperture along the H-plane thus becomes relatively
uniform which improves the directivity
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