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In this paper, a circuit synthesis approach based on an extended Foster canonical expansion for representation of distributed passive lossy electromagnetic structures is described. Compact lumped element model is extracted from data provided by numerical TLM method in the time-domain and then embedded into a conventional circuit simulator. The equivalent circuit synthesis procedure is applied to the...
Faced with the challenges of increasing operational frequencies and switching rates of modern electronics devices used in electrical systems, there is an extensive need for high frequency models (up to a few gigahertz) for electrical components like bandpass filters, couplers and power distributors. This paper presents the application of partial element equivalent circuit (PEEC) theory for the creation...
A vertical distribution low temperature cofired-ceramic (LTCC) duplexer is presented in this paper. It is constructed using two band pass filters based on lump-element components. In order to reduce the size, we use vertical structure to arrange the two band pass filters. The two band pass filters are both true third-order topology and T type. Their center frequencies are individually 1.61GHz and...
One type of E-shape microstrip structure is composed of λg/2 hairpin resonator loaded by a grounded stub at its middle. For the first time, using an equivalent circuit for this structure, high-order UWB bandpass filter design technique is presented based on cascading E-shape microstrip structures. Two third-order UWB bandpass filters are designed, simulated, fabricated and measured. These filters...
A compact ultra-wideband (UWB) bandpass filter (BPF) with well matched characteristics is proposed in this paper. The BPF consists of weakly-coupled stepped impedance resonators (SIRs) and parallel-coupled lines. Firstly, the performances of the coupled SIRs were examined, and their results show the broad bandpass characteristics with sharp attenuation slope. Next the bandpass performances of the...
Recently the E-shape microstrip structure was proposed in order to develop miniaturized ultra-wide band (UWB) bandpass filters. In spite of its attractive features, no thorough analysis of this structure is available in the literature. In this paper, the E-shape microstrip structure with grounded center conductor is analyzed and, for the first time, an approximate equivalent circuit is proposed for...
In this paper, we propose a novel design of embedded filter for the noise decoupling between power and ground planes. At its isolation band, this compact filter provides a short path for the return current of the signal. Therefore, it prevents the propagation of the digital switching noise along the power distribution network, and improves the power integrity. This embedded filter provides the noise...
In this paper, we design and fabricate a coplanar waveguide (CPW) bandpass filter operating at 60 GHz. A new DGS pattern is proposed and serves as the unit cell. We cascade two unit cells to construct a second-order bandpass filter. The equivalent lumped element circuit model was extracted form the full-wave electromagnetic simulation. Moreover, we obtain good agreement between circuit model analysis...
A new technique for design low profile FSS with high order band-pass performance is presented. By choosing the hybrid resonator properly, single band with third order performance or dual band with second order behavior at upper band and first order behavior at lower band can be realized.
This paper introduces a generalized methodology to design low profile Nth-order bandpass frequency selective surfaces. The generalized methodology is based on coupled resonators filter theory. The design procedure is validated by design examples of second and third-order frequency selective surface with band-pass response.
In this paper, a new technique for designing low-profile dual-band frequency selective surfaces, with second-order band pass responses, is presented. Using this technique, a dual-band response with a small separation between the two bands and high out-of-band rejection can be achieved. Similar to the structure reported in [6], the constituting elements composed of resonant elements and sub-wave length...
This paper investigates about the main properties of metamaterials and proposes an application of these structures as high band pass filter in the frequency range 0 - 10 Ghz. The equivalent circuit is extracted: some electrical parameters are carried out by the finite element method, other by the analytical solution and other by the finite difference method. The ohmic losses are neglected and the...
This paper presents a band-pass tunable filter (BPF) within frequency ranges of 13-20GHz and it shows good stop rejection and sharp roll off frequency. It used a novel design to turn the resonant frequency by micro-electromechanical systems (MEMS) switch and coplanar-waveguide (CPW) structures. The DC voltage is utilized to load RF-MEMS switch as source of the tunable cell's power. The simulation...
This paper presents a novel approach for designing microstrip triple-mode wideband bandpass filter with good selectivity. The triple-mode resonator is composed of an open-ended microstrip line with length of half-wavelength (λ/2) and two center loaded radial-line stubs. The mode characteristics of the resonator are discussed. Also, an equivalent lumped circuit is proposed, including the parameters...
A novel method for notch implementation in ultra-wideband (UWB) bandpass filter using open circuited metal lines embedded in a defected ground structure (DGS) is proposed. Distinct from traditional notch implementation, the proposed method uses the additional metal lines with half waveguide length embedded in defected ground structure to produce additional notch band behavior based on the DGS bandpass...
In this paper, quasi-lumped design of a BPF using the suspended stripline (SSL) is demonstrated. The proposed SSL BPF has achieved the benefits of size compactness, extremely low insertion losses, low dispersion, high operation frequency, and sometimes the wide stopband bandwidth. A cross-coupling structure is introduced in filter between the I/O to create transmission zeros by the passband for the...
A compact ultra wide-band bandpass filter is proposed in this paper. The BPF consists of a hairpin-type LPF with a chip capacitor and a HPF using parallel-coupled lines. Firstly, the circuit model of LPF is investigated. Next, the characteristics of the HPF is also examined, and the results show the broad bandpass characteristics. Then the performances of UWB BPF composed of the LPF and the HPF are...
This paper presents the design of a microstrip switchable band pass-stopband filter based on periodically loaded transmission lines. The proposed design, takes advantage of the structure symmetry of the left handed periodically loaded based filter and the extra degrees of freedom introduced by the metamaterial structure to switch between stop-band and bandpass behavior. It is shown that the relations...
A new topology of balanced NL CRLH TL has been designed and then analysed, using hyperabrupt Schottky-varactor diodes as nonlinear element. The parallel resonators of the CRLH structures have been modelled by open-ended transmission lines, to overcome the biasing problems of the diodes. For a NL CRLH TL consisting of three identical cascaded cells, the numerical put into evidence the possibility the...
In this paper, the new dual frequency DGS unit cell and its equivalent circuit model have been proposed. Model parameters extracting process was detailed and has been demonstrated its validity by experiment circuits. A significant improvement in effective capacitances is also illustrated. According to dual frequency DGS characteristics discussed in this paper, this newly proposed structure can be...
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