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This paper presents a new four poles dual-mode of the triangular microstrip filter with asymmetrical input and output filter feed. Cameron theory is applied to synthesize coupling matrix and design the filter. The filter is optimized by using the Cauchy's method, which is used in the S band with 200MHz pass-band filters of orders two and four are successfully designed. The results show that the insertion...
In this paper, a compact bandpass filter with an ultra-wide upper stopband is proposed using novel slow-wave resonators, which consist of one conventional and one tapered coplanar-waveguide (CPW) sections with two identical loaded short-stubs. Such resonator can not only introduce the adjustable fundamental resonance f0, but also shift the spurious to higher frequency bands. Then, based on the proposed...
This paper investigates and compares the via-coupling and gap-coupling mechanisms in end-coupled structures, in which the former is realized by the shared metallic via between two resonators. Comparisons show that the via-coupling provides more design flexibility, owns better tolerance to fabrication errors and requires more ordinary substrate than the traditional gap-coupling. These merits have been...
A novel microstrip bandpass filter with multiple transmission zeros using open/shorted stubs is presented in this paper. By utilizing shorted coupled lines and the open/shorted stubs, eight out-of-band transmission zeros can be realized for the bandpass filter from 0 to 2f0 (f0 is the center frequency of the passband). The eight transmission zeros can be adjusted freely by only changing the electrical...
In this paper, a compact quarter-wavelength stepped-impedance resonator bandpass filter is proposed, two extra transmission zeros are implemented by source-load coupling between the feedlines, a filter with two resonators is designed, each resonator consists of a low-Z section and a high-Z section, good performance is achieved both in passband and stopband. Demonstrator filter is designed on the Rogers...
This paper proposes a design of folded stepped impedance resonator (SIR) filter with cross-coupled structure for size reduction and improved spurious suppression in the stopband. The design concept is demonstrated by using four SIR resonators with the fundamental frequency, f0, of 5.3 GHz. For a comprehensive treatment of the filter with open stubs and embedded slot feeds, the spurious response can...
In this paper, a compact bandpass filter (BPF) with improved stopband characteristics using novel stepped impedance resonators (SIRs) is proposed. The conventional low-impedance stub of SIR is replaced by radial stubs, owing to its intrinsic wide stopband characteristics; the stopband rejection can be widened. A new BPF centered at 1.57 GHz has been designed and fabricated to verify the validity of...
This paper proposes design of a bandpass filter with wide harmonics suppression more than 4f0. Designing uses step-impedance resonators structure for operates the center frequency and uses stub loads for harmonics suppression. This bandpass filter is designed for support WLAN at 2.45 GHz. The measured results of the proposed bandpass filter have the insertion loss 1.00 dB and the return loss 29.26...
In this paper, a compact bandpass filter (BPF) with improved stopband characteristics using novel stepped impedance resonators (SIRs) is proposed. The conventional low-impedance stub of SIR is replaced by radial stubs, owing to its intrinsic wide stopband characteristics; the stopband rejection can be widened. A new BPF centered at 1.57 GHz has been designed and fabricated to verify the validity of...
Dual-mode ring resonator filter is designed to have a relatively wide passband with a miniaturized circuit area. The miniaturization is achieved by folding the ring trace to a spiral configuration. The two degenerate modes are split up by an asymmetric inductive perturbation. As a result, the circuit area is only 29% of that of a conventional ring. The strong I/O coupling required by the wide passband...
A compact bandpass filter (BPF) with enhanced stopband characteristics is presented in this paper. The proposed BPF consists of four improved stepped impedance resonators (SIRs),which implements into a box-section strcture. To improve the frequency selectivity and the stopband characteristics, additional transmission zero (TZ) was introduced by mixed electric and magnetic (EM) coupling. A new filter...
This paper describes the resonator bandpass filter design using the non-uniform parallel coupled “wiggly-line” technique. The proposed resonator is consisted of three sections quarter wavelength coupler and each of sections has perturbation and Z0 connected in the end of each ports. This resonator can reduce the spurious response at 2f0 and 3f0 by its structure. The directivity enhanced parallel-coupler...
A miniaturization technique for microstrip square open loop resonators is presented in this paper. The method is based on the capacitive loading of the resonators. The effect of this technique on the coupling between resonators is studied as well as the effect on the quality factor of each resonator. A 1 GHz bandpass filter is designed, simulated, and built in order to test this technique. The final...
A novel planar dual-mode elliptic-function microstrip bandpass filter with two triangle corner cuts and a square notch is proposed, and the performance of the designed filter is studied in detail. The proposed filter structure uses a single patch without coupling gaps. The center frequency is about 2.13 GHz. The 3 dB fractional bandwidth is 9.86%, and the minimum insertion loss in the passband is...
In this paper, a class of triple-band bandpass filters with two transmission poles in each passband is proposed using three pairs of degenerate modes in a ring resonator. In order to provide a physical insight into the resonance movements, the equivalent lumped circuits are firstly developed, where two transmission poles in the first and third passbands can be distinctly tracked as a function of port...
In this paper, a compact four-poles cross-coupled square open loop resonator diplexer is proposed to develop the microstrip square open loop resonators bandpass filter. The filter is based upon a square open loop resonator consisting of two identical patches which is attached to the inner corner of the square open loop for size reduction. The compact miniaturized four poles square open loop resonators...
This paper presents detailed investigations on resonant-mode behavior of a new three-mode resonator, which consists of a parallel-coupled microstrip line resonator embedded with a slotline resonator. Electric-field distributions and modal resonant frequencies of three modes are analyzed by using an electromagnetic simulator, thereby showing that the three modes are controllable with the ratio of the...
In this paper, determining the resonant frequency for the bandpass filter using single dual-mode resonator is proposed. A coupling coefficient implies the information which is the positions of poles for the filter. Therefore, we can obtain the resonant frequencies (fe, fm) from the above information and the analysis of the equivalent circuit. These resonant frequencies are determined to even-mode...
A novel Nth-order microstrip filter with N+2 transmission zeros using two dual-mode resonators is presented in this paper. Two different coupling schemes are obtained by changing couplings between dual-mode resonators and ports. Then, two fourth- and second-order filter characteristics with three and four transmission zeros are obtained correspondingly. The generation mechanism of transmission zeros...
In this paper, a new novel compact dual-band bandpass filter is proposed. The module consists of two square defected structure in the ground and a dual-line coupling structure are used for coupling enhancement, the transmission zeros are then introduced to avoid being interfered by the WLAN radio signals by properly via holes. The proposed component is fabricated in a planar microstrip configuration...
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