Multi Wideband Hexagonal-Spiral Microstrip Band-Pass Filter for Wireless Applications
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In this communication, multi-wideband micro-strip Hexagonal-Spiral (HS)band-pass filter is presented. The proposed multiband band-pass filter consists of four spiral shunt quarter-wavelength short-circuited stubs separated by connecting lines with length of λg/2 and λg/4, respectively. Appropriate transmission zeros are generated to isolate the bands of proposed band-pass filter, as desired. From the simulated results, the offered wide bandwidth observed for dual band-pass filter is 240 MHz (0.8 GHz to 1.04 GHz) and 250 MHz (1.18 GHz to 1.43 GHz). The bandwidth for the proposed triple band pass filter are 220 MHz (0.64 GHz to 0.86 GHz), 100 MHz (1.38 GHz to 1.48 GHz), and 400 MHz (2.31 GHz to 2.71 GHz). The triple band HS filter is fabricated and tested with network analyzer. The measured results are in good agreement with the simulation results. These filters are suitable for GSM 900 MHz and WLAN (2.4 GHz) applications.Keywords:
Wideband
Multi-band device
GSM
A new method of designing re-entrant cavity bandpass filters is discussed. By using this method filters can be designed without any experimental trials. Filters are molded with identical outer dimensions over 4 to 8 GHz bands and mass produced. Their measurements coincide with theoretical results obtained by this new design method.
Network synthesis filters
Filtering theory
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In this paper, a combined quasi-lumped-open-loop resonator (QL-OLR) is introduced and applied for filter design. The resonator can have single and dual-band behavior. Two bandpass filters as well as two dual-band bandpass filters have been designed, fabricated, and tested, that consist of two resonators each. The bandpass filters show the behavior of four return loss poles (fourth order filter), and by slitting these resonators a dual-band bandpass filter can be achieved (each band has two return loss poles). Transmission zeroes can be easily introduced into the filter response as well by utilizing the properties of both quasi-lumped and open-loop resonators
Stripline
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Return loss
Butterworth filter
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Abstract This paper presents the design of frequency-tunable dual-band, tri-band and quad-band bandpass filters (BPFs). The proposed three BPFs can be independently tuned and individually switched by varying the capacitances of the varactors. In the designed tunable dual-band BPF (TD-BPF), common input/output feed lines are utilized for two tunable dual-mode resonators (TDRs). Further, three TDRs and four TDRs are employed to achieve tunable tri-band BPF (TT-BPF) and tunable quad-band BPF (TQ-BPF), respectively. Then, the TD-BPF and the TT-BPF are fabricated and measured to verify individual tunability and independent switchability. For the TD-BPF, the measurement results show that the center frequency (CF) of the first passband varies from 1.37 to 1.62 GHz, and the CF of the second passband varies from 2.3 to 2.64 GHz. In the measured TT-BPF, the tuning ranges of CFs of three passbands are 1.3–1.5 GHz, 2.36–2.6 GHz, and 3–3.54 GHz, respectively.
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Multi-band device
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Design techniques for microwave bandpass filters using re-entrant resonators are presented. The key feature is that each re-entrant resonator in the filter generates a passband resonance and a finite frequency transmission zero above the passband. Thus, an N th degree filter can have N finite frequency transmission zeros with a simple physical realization. A physically symmetrical five-pole re-entrant bandpass filter prototype with five transmission zeros above the passband was designed and fabricated. Measured results showed good correspondence with theories.
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This paper reports on the design of a 24 GHz bandpass filter. This device is developed in a multilayer BCB-Si technology to ensure the development of the system on a unique chip. Moreover the technique of integration of semi-lumped lowpass filters in bandpass filter is used to reduce the global size and eliminate spurious response of the filter. The general method to design this kind of filters is described and experimental results are presented.
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This paper proposes a compact dual-band bandpass filter (DBPF) based on a parallel-planar architecture where resonators are formed on the opposite sides of each substrate. The proposed architecture enables dual-band operation without an appreciable change in the volume of the DBPF and yields design freedom for the resonant frequencies by adjusting the distance between the substrates. A 2.4-/2.9-GHz band DBPF is fabricated using YBCO film deposited on a MgO substrate with a coplanar waveguide structure to investigate experimentally dual-band operation. The measurement results agree with those of the simulation.
Multi-band device
Coplanar waveguide
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Waveguide bandpass filters with improved stopband performance are investigated. The predicted filters performance show improved stopband performance and reduced filter dimensions compared with conventional E-plane bandpass filters. The validity of the method is confirmed by the measurement of a fabricated five resonator ridged waveguide bandpass filter, for which measured response shows good agreement with simulated results.
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The construction principle of modified hairpin bandpass filters in microwave ranges is designed. It is shown, that amplitude-frequency characteristics of the proposed filters have more high steepness decline and best suppression in band of the barrier in comparison with its prototype. These filters are easy in fabrication and adjustment.
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This paper reports compact single/dual-band bandpass filters with independently controllable passbands based on a novel microstrip staircase resonator. A parallel feeding mechanism is introduced to offer better harmonics suppression on the proposed single-band BPF and also to create a second independent resonance path between the parallel feeding lines, effectively implementing compact dual-band BPF structures. Furthermore, due to the independently separated resonance paths, the passbands can be controlled independently without affecting each other. Therefore, very close frequency passbands can be effectively obtained in the proposed dual-band configuration. For demonstration and validation purposes, three miniaturized single/dual-band BPFs are designed and fabricated.
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Multi-band device
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Two forms of quasi-optical filters are discussed herein for use at millimeter-wave frequencies and possibly for far infrared frequencies. One form consists of metallic grids with intervening dielectric support material which forms a quasi-optical filter analogous to the inductively coupled waveguide bandpass filter. Because of dielectric losses, the relatively weak upper stopband, and the rapidly repeating passbands, this type of structure leaves much to be desired as a bandpass quasi-optical filter. However, when designed for wide bandwidth, it makes a very good pseudo-high-pass filter. For moderate- to wide-band bandpass applications, pseudo-high-pass filters of this type can be designed to match with a form of quasi-optical low-pass filter previously treated by the authors, in order to give a bandpass filter with strong, broad stopbands on both sides of the passband. Design principles, computed performance, and experimental results are presented for both pseudo-high-pass and bandpass structures.
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