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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... July 2009 [Communications] TD-SCDMA Receiver Captures Multiple Channels Wireless systems operators must adapt their networks to increasing data rates to meet customer demands. Next-generation wireless systems are adopting such techniques as receive diversity and multicarrier architectures to cope with the increasing data needs. In China, the use of time-division synchronous code-division-multiple-access (TD-SCDMA)1 as an alternative to wideband CDMA (WCDMA) attempts to provide improved coverage in a wide range of... 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... June 2007 [Systems & Subsystems] Optimized Transceiver Aids Broadband Wireless Access Broadband-wireless-access (BWA) technology promises high-speed Internet connections by means of reliable wireless devices. But, in order to achieve cost-effective products in a competitive marketplace, the RF hardware in broadband-wireless-access products must be compact and reproducible. Fortunately, the authors have developed an RF/microwave module for broadband wireless access applications that provides excellent performance in a compact size. The module consists of an antenna... |
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