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This paper presents a novel sub-harmonic self-oscillating mixer (SOM) topology that makes use of the orthogonality of two operating modes in a substrate integrated waveguide (SIW) cavity. The SOM circuit consists of a dual-mode SIW band-pass filter (BPF), a common source hetero-junction FET (HJFET) and a low-pass filter. The fundamental mode (H101) of the SIW cavity is used for RF mode operation while...
A method based on equivalent circuit is presented to design a class of compacted millimeter wave bandpass filters in standard 0.18-mum CMOS process. Thin film microstrip is properly constructed on the lossy silicon substrate to realize small insertion loss. Using broadside-coupled scheme, thin film microstrip bandpass filters are designed and fabricated. Equivalent circuit model and theoretical network...
This paper presents a novel tunable bandpass filter design with independent control of both the centre frequency and the bandwidth by means of analogue-series and digital-shunt MEMS capacitors. The filter is designed for operation in X and Ku bands with 4 pre-selected centre frequencies (from 10 GHz to 14 GHz) and with a bandwidth tunability of 70% (variable between 500 MHz and 1 GHz). The filter...
In this paper, a 5.8-GHz amplifier with novel RF electrostatic discharge (ESD) protection is proposed in GaAs 2-mum HBT process. The amplifier incorporates with the ESD devices to form a band pass filter (BPF) structure with good impedance matching for RF ESD protection. In the mean while, an amplifier without ESD protection and another with conventional ESD protection are fabricated in parallel for...
A unique design approach for narrowband tunable bandpass filters is presented which focuses on engineering the tuned center-frequency dependence of the coupling coefficient between adjacent resonators. New architectures are presented, and equations for the coupling coefficient are derived from energy expressions. A microstrip prototype with independently-tunable center frequency and bandwidth was...
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