Development of Low Profile Substrate Integrated Waveguide Horn Antenna With Improved Gain

In this paper, a new low profile substrate integrated waveguide (siw) probe-fed h-plane horn antennawith improved gain is proposed. it consists of two waveguides, including a rectangular and a taperedone, in which both the first and third modes of the structure are simultaneously excited leading toa uniform field distribution along the radiating aperture of the antenna and in turn, its directivity isimproved. moreover, using a coaxial probe to excite the antenna, spurious radiation due to the feedingnetwork is suppressed. the antenna structure is numerically analyzed using a software package, and aprototype is made using a single thin substrate layer. a good agreement is obtained between simulatedand measured results. the measured results show 10.48 dbi gain which is 4.9 dbi higher than the gainof a conventional siw horn obtained at 27.8 ghz. the introduced antenna is compact and can be usedas a single antenna or as an element of a large antenna array.