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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...
In this paper, a fixed-frequency filter and two RF MEMS based frequency-agile filtfiltersers at Ku-band are demonstrated. All filters are designed in a so-called Substrate Integrated Cavity (SIC) topology, and they are processed in LTCC (Low Temperature Co-fired Ceramics) DuPont 943 substrate. The tunable filters are steered over frequency by means of coplanar stubs, whose electrical length is adjustable...
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...
To cope with the economical and technical demands of the market and to compete with terrestrial networks, satellite operators and manufacturers will need to upgrade their satellites and services. Nowadays, most of commercial satellite payloads are designed for a predetermined service and lack flexibility. Future communication satellites have to become more flexible and shall provide capacity at the...
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...
This paper presents an RF MEMS tunable filter implemented in waveguide. A compact waveguide topology was chosen to make use of high-Q cavity resonators for the creation of a low-loss, two-pole filter. The filter results in an insertion loss of 4.7-5.8 dB over the tuning range 10.12-10.33 GHz with a relative bandwidth of 0.42-0.67%. This design demonstrates an unloaded quality factor of 169-319 over...
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