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A novel graded index (GRIN) based substrate integrated waveguide (SIW) directional coupler is proposed for bandwidth enhancement. The suppression of higher order modes in the coupling region of the directional coupler is achieved by reduction in the permittivity in the coupling region by the utilization of GRIN substrate. An enhancement in the fractional bandwidth of 7% is achieved by proposed directional...
This study presents an electronically tunable low-voltage mixed-mode universal biquad filter. The proposed filter employs only three current controlled current conveyor trans-conductance amplifiers (CCCCTAs) and two grounded capacitors. The proposed filter can realise low pass, band pass and high pass responses in all the four possible modes, that is, voltage-mode, current-mode, trans-admittance-mode...
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