This new waveguide feed method which is used to excite the microstrip patch antenna. Traditional techniques for feeding microstrip antennas are by coaxial transmission line or by microstrip lines but at high frequency operations they are not give the satisfactory performance because at high frequency wavelength is very low so small small objects will also cause interference, thereby increasing attenuation. Waveguides have several advantages over two-wire and coaxial transmission lines. For example, the large surface area of waveguides greatly reduces copper (I2R) losses. At microwave frequencies, the losses due to skin effect is very low because waveguide is having four walls so the current carrying area is greater compared to wire. Waveguide also shows better results if we consider the concept of dielectric losses in comparison with coaxial cable. The power handling capability of waveguide is an added advantage. Hence in this report by new proposed method we have tried to overcome the disadvantages of traditional antenna feeding techniques though there are disadvantage of size, limitations at lower frequency operation that we face in this method. So in this way we can take advantage of microstrip patch antenna and waveguide both.
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