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July 2010 [Communications] Front End Fits SDR Picocells Software-defined-radio (SDR) approaches are being used in compact cellular base stations, including in picocellular systems serving small areas such as onboard commercial aircraft. Wireless communications systems onboard an airplane must provide high-quality audio, video, and data services conveniently but without interference with the aircraft’s navigation systems. As a result, a picocell solution must perform with sufficient suppression of... March 2010 [Components] Tune Out Spurious In Dual-Mode BPFs Miniature filters are essential for wireless communications systems although they often suffer from limited rejection bandwidths. However, through the use of a modified coupling structure for harmonic suppression, it has been possible to design a dual-mode filter capable of wide rejection bandwidth and 20-dB rejection through 8.5 GHz. A number of dual-mode filters1-4 have been developed based on microstrip square loop... December 2008 [Components] Equalize RF Amplifiers With Bandpass Filters Filters and amplifiers can make a powerful combination, especially when the filter is used to equalize the amplifier. What follows is an approach to apply the complementary response characteristics of a bandpass filter to flatten the amplitude response of a transmit amplifier. The filter consists of a pair of asymmetric slow-wave open-loop resonators. It reduced ripple in a transmitter’s passband from 3.3 dB before equalization to 0.5 dB after... |
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