Abstract
In this paper a compact and wideband ridged substrate integrated waveguide (RSIW) horn antenna is proposed. Unlike the previous works, the ridge structure in the proposed antenna is tapered only along the width allowing the antenna to be designed on just two-layer dielectric substrate. The tapered ridge is created by simple, different diameter size vias just in one layer. The antenna designed has dimension of 14 × 33 × 3 mm3 (1.4λo × 3.3λo × 0.3λo, where λo is the free space wavelength at 30 GHz) and a has a bandwidth of 41.32% covering 24 - 36.5 GHz with the reflection coefficient, S11, under -10 dB. The antenna is simulated through two software packages CST and HFSS and results are compared.
Highlights
One of the simplest and widely used directive microwave antennas is the horn
Due to the use of printed circuit technology, substrate integrated waveguide (SIW) antennas are light in weight, compact in size, low profile, easy to integrate with other elements and are easy to fabricate
We present a compact wideband dielectric loaded H-plane sectoral ridged SIW horn antenna
Summary
One of the simplest and widely used directive microwave antennas is the horn. Horn antennas in their usual form are bulky, expensive and take time to fabricate, especially at higher frequencies [1,2,3,4]. Rather than using ridge to provide a higher bandwidth, [14] uses an extended air-via perforated (different hole diameters) dielectric section in front of the SIW horn antenna. The structure is based on two-layer dielectric substrate and uses a width tapered ridge horn antenna. To improve the impedance bandwidth of the overall structure one can extend both the first and second substrates in the cross section and create the dielectric slab section, Fig. 2. For a given waveguide aperture, it is found that to have maximum gain and have a good S11 (< -10dB) for the proposed antenna the dielectric substrates used for the SIW horn section can be extended by Ls = 15 mm
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