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This paper presents details of a self-diplexing dual antenna system and associated antenna interface module. The manufactured demonstrator operates efficiently in 4 GSM bands and 3 UTRA bands with antennas that are just 6 mm high. It is shown that the VSWR can be maintained below approximately 4:1 in all modes no matter how the phone containing the antennas(More)
This paper presents design and investigation of three miniaturized high-performance bandpass filters for wireless applications at 2.45 GHz. The quasi-lumped-element filters with improved insertion loss performance and reduced size, have been designed on a commercial low-temperature co-fired ceramics (LTCC) system, manufactured and experimentally(More)
This paper presents a novel approach to synthesis of bandpass filters, which makes it possible to minimize filter insertion loss. The approach is applicable to any type of resonators and filter configuration. Practical application of the approach is illustrated by a design of bandpass filters based on edge-coupled half-wavelength microstrip resonators.
The design of two compact bandpass filters for Ka-band satellite communication applications (downlink 17-22 GHz) is presented. Both filters are designed with additional transmission zeros at finite frequencies in order to improve the out-of-band selectivity. The filters have been realised as low-cost LTCC modules and the scattering parameters have been(More)
This paper presents an analytical approach that makes it possible to find an ultimate theoretical minimum of insertion loss for the Butterworth and Chebyshev filters. This minimum is achieved, if the filters are designed for the optimum bandwidth. The difference between the minimum of insertion loss for a practical case of the integer number of resonators(More)
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