Ultra-Wideband Bandpass Filter Using U-Slotted Substrate Integrated Waveguide (SIW) Cavities At 12 Ghz For X-Ku Band Radar Application

Edward, Syahirah (2019) Ultra-Wideband Bandpass Filter Using U-Slotted Substrate Integrated Waveguide (SIW) Cavities At 12 Ghz For X-Ku Band Radar Application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

An Ultra-wideband (UWB) Substrate Integrated Waveguide (SIW) bandpass filter is proposed and designed using U shape slot Substrate Integrated Waveguide (SIW) cavities and additional via hole for X-Ku band radar application. In order to achieved an Ultra-wideband (UWB), the U shape slots at the top copper layer are used to form a new multiple-mode resonator (MMR) while keeping the size of the filter to be small. For the effect of feed line h and w, as the value of h increase, the frequency response shift to the right. While for w, as the value of w increase, the bandwidth is still the same but the value of the resonance frequency and the return loss will be different. For the length between U shape slots (g), as the value of g decreases, the bandwidth will be decrease and the upper-cut-off frequency shift to small frequency value. Besides, as the length of U shape slots (k) increase, the frequency response shift to the left and the bandwidth became smaller. Other than that, the additional via hole is used to shift the center frequency to a higher frequency. In this proposed filter design, the substrate used is Rogers 4350 with a dielectric constant of 3.66 and thickness of 0.508mm. The simulation results show that the filter achieved insertion loss bigger than -0.405dB, return loss smaller than -10.5dB, and 3dB fractional bandwidth of 60.8%.

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