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Designing a filter with harmonic suppression capability without adding any external filtering capacitors or notch filter is a big challenge. The paper presents the design of a compact microstrip bandpass filter having integrated harmonic suppression capability. The filter operates at a center frequency of 900 MHz. The structure chosen is the Hairpin Filter. The conventional hairpin is modified by...
A compact two-pole bandpass filter based on the composite right/left-handed (CRLH) metamaterial transmission line structure is proposed in this paper. In detail, subwavelength resonators are realized through the zeroth order resonance (ZOR), and inverter structures are proposed to control the coupling between neighbouring ZOR resonators. The proposed technique is validated by the EM predictions, the...
The paper presents the design of Interdigital Band Pass Filter (IBPF) for WLAN applications at center frequency 2.45GHz. It was designed using a 3D EM simulation tool and fabricated on substrate Ferro A6S by using in-house process of Low Temperature Co-fired Ceramic (LTCC) technology. Simulated and measured results were presented. The pass band insertion loss of the filter was measured to be -1.66dB...
This paper focuses on the analysis to find suitable locations to place dielectric resonators on microstrip transmission line in order to obtain a high coupling effect. A novel design of an X-Band bandpass filter from a combination of a simple transmission line and three cylindrical dielectric resonators are used in this analysis. The three dielectric resonators are same in permittivity and radius...
A novel ring resonator which is fed along one of its quarter-wavelength sides is presented. The resonator's response presents a single-mode resonant frequency with a transmission zero at both sides of its passband. Two such resonators are proposed to be combined in series to result in a 3rd order bandpass response with a good out-of-band rejection level. The resonator and filter are simulated and...
This paper reports a parametric investigation of a compact UWB bandpass filter based on multilayer ring resonators (MRR). With the strip width, loop length and gap size fixed, the scattering parameters of the filter were simulated using CST electromagnetic simulator for various cases of differing substrate thickness and permittivity, and against the number of resonators and their orientation. Our...
This paper presents design and implementation of an X-band substrate integrated waveguide (SIW) filter based on cavities coupled to a microstrip line. This method of coupling which is suitable for multilayer structures may also be used as a tunable filter by tuning the SIW cavity. A three pole narrowband SIW filter has been designed based on this method of cavity coupling. Simulations using HFSS and...
This paper presents a configurable bandpass filter using commercial RF MEMS switches in a compact triple-mode resonator. Before designing the filter, the effect of using the RF-MEMS switch on the resonant frequency of a simple hairpin resonator is studied. The insertion loss of the switch is measured. A three-pole Chebyshev bandpass filter with a fractional bandwidth of 20% at a center frequency of...
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