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A novel GaAs monolithic microwave integrated circuit (MMIC) active filter structure based on the lumped and transversal technique is proposed for operation in the X-band. This new structure includes a tuned amplifier as transversal element of the filter in order to improve the band-edge rejection. A design example of a bandpass filter centered @7.5 GHz with 2-dB passband ripple and 30-dB rejection @1 GHz apart from passband edges is presented in terms of computer simulations and layout. The simulated results demonstrate its superior performance when compared with the traditional lumped and transversal technique.Index Terms-MMIC, microwave active filter, transversal filter.

A new design method of the dual‐band balanced bandpass filter (BPF) using multilayer packaging dual‐mode substrate integrated waveguide (SIW) cavities is proposed. Split‐type coupling topology based on dual‐mode resonators is developed for the design. Firstly, a single‐band balanced filter with perturbed metal vias is designed. The TE201 mode and the TE202 mode perturbed by the metal vias can form a passband. Secondly, an additional metal vias perturbed SIW cavity with the same dual‐mode is placed in the lower layer for the bandstop function. A dual‐band balanced BPF with split‐type coupling topology is successfully realised. Compared with the traditional cascaded single‐mode form, the proposed dual‐mode split‐type design has more compact size and can be more easily extended to multi‐passbands. To verify the proposed method, a dual‐band balanced filter operating at 13.3 and 14.2 GHz is designed, fabricated and measured. The designed dual‐band balanced filter has good filtering performance including differential mode passband transmission and common mode rejection. Measured results show good agreements with simulated ones.

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A novel compact microstrip lowpass filter using N‐turn meander line structure is proposed. This low pass filter provides a transmission zero near the passband edge and low passband insertion loss. Both the cutoff frequency and transmission zero can be easily controlled by changing the meander line dimensions to ease the filter design. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1339–1341, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21619

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