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A new microstrip ultra-wideband (UWB) bandpass filter (BPF) with dual sharply rejected notched bands based on E-shaped resonator is proposed in this letter. The basic UWB BPF is designed using interdigital coupled lines and rectangular patch multiple-mode resonator (MMR). Then, the resonance properties of the E-shaped resonator are studied. The analyzed results reveal that the dual-mode resonant property...
A compact and novel lowpass filter using three-order corner-cutting TCMRC (T-shaped compact microstrip resonator cells) is presented. Such a structure decreases the unnecessary coupling between the microstrip transmission lines and presents a good impedance matching and less spurious responses. Based on this theory, the proposed filter has been designed, fabricated and measured. From the measurements,...
An in-line feed-line configuration for design microstrip dual-mode triangular patch resonator bandpass filters (BPFs) is presented in this paper. By properly arranging the feed-line positions, it generates two or four transmission zeros adjacent to cutoff frequencies of the passband, which improves the selectivity. The computed current distributions of a pair of degenerate modes show slight difference...
Based on the theoretical formulation of the electromagnetic field distributions within a square patch resonator, an equivalent circuit and corresponding coupling model of the patch resonator for dual-mode filter operations are first constructed. Then, a circular hole (called as a perturbation element) etched on the patch itself with symmetric or antisymmetric to the excitation ports is studied. Further,...
This paper has proposed a frequency divider with high division ratio for Ka-band applications. For demonstration purpose, a 27 to 3 GHz divider has been designed, fabricated and measured. The experimental results indicate that a locking range of 180 MHz has been achieved with high input sensitivity. Meanwhile, the required DC current is only 10.85 mA with power consumption being 12 mW. The studied...
Based on a square patch resonator, a compact dual-mode band-pass filter is studied in this paper. The size reduction of the developed filter is simply achieved by etching a dual-cross slot on the patch. Studies indicate that with this arrangement, the size can be reduced to 26.7% as compared to the conventional patch resonator. Meanwhile, a pair of transmission zeros close to the pass band improves...
In this paper, a novel ultra-wideband (UWB) bandpass filter (BPF) with compact size and improved upper-stopband performance has been studied and designed using multiple-mode resonator (MMR). The MMR is formed by attaching three pairs of ring open stubs in shunt to a high impedance microstrip line. By simply adjusting the radius of the circles of the ring stubs, the resonant modes of the MMR can be...
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