NOVEL TRANSFORMATION TO DESIGN TRI-BAND FILTERS

A Novel 1.5 Quadruple Antenna for Tri-Band GPS Applications

A new global positioning system (GPS) antenna is proposed to cover the three GPS bands (L1, L2, and L5, namely 1575, 1227, and 1176 MHz) with the L5 band to be added after 2006. The developed antenna size is only 1 5 1 5 in aperture corresponding to 7 7 ( = free space wavelength) and 13 thick. Quadrature feeding is employed to ensure right-hand circular polarized (RHCP) radiation. The final min...

Wideband Tri-band Filter Design using Stepped-impedance Stub Resonators

This letter presents a wideband tri-passband filter in which tri-section stepped-impedance shunt-stubs are used as tri-mode resonators, connected by transmission lines. Developed from the topology of quarter-wavelength stub filters, these filters have much wider passbands compared to many other designs published. The stepped-impedance stubs also contribute transmission zeros between the passban...

Design of Unequal Wilkinson Power Divider for Tri-band Operation

Abstract—This paper presents a novel tri-band unequal Wilkinson power divider. The proposed structure is derived from the conventional unequal Wilkinson power divider by replacing the quarter-wavelength branch lines and quarter-wavelength transformers with the extended T-shaped short stubs and three-section transformers respectively. The first and third operating frequencies of the proposed Wil...

Design of 2-D Half-Band Filters and Fan Filters Using 1-D One-Band Filters by GA Approach

This paper reveals that there exists a closed relationship between 2-D half-band filters and fan filters. It is also found that the complex conventional 2-D design methods can be replaced by the design of 1D filters only for design both filters. Furthermore, an effective GA approach is proposed for designing FIR digital filters. By minimizing a quadratic measure of the error in the frequency ba...

High-performance variable band-pass/band-stop state-space digital filters using Gramian-preserving frequency transformation