The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A microstrip differential-mode (balanced) bandpass filter covering the frequency spectrum assigned for ultra-wideband (UWB) communications (3.1GHz–10.6GHz) is presented. The main relevant characteristics of the proposed filter are: (i) the good stop band performance above the band of interest, with high selectivity, harmonic suppression and broad rejection bandwidth, achieved thanks to the embedded...
This paper presents a quad-band filter using a set of stub-loaded quarter-wavelength resonators operated at the first and fourth passbands (1.8/5.8 GHz) and a set of stub-loaded half-wavelength SIRs operated at the second and third passbands (2.4/3.5 GHz). Furthermore, both of the loading stub are used to generate another passband. This study provides an effective method to design a quad-band filter...
A new class of combiners for base stations of mobile communications is introduced. This combiner allows to share two antennas between two base stations which both use an additional diversity channel in the receiving band. To achieve this result, classical combiners require at least 4 filters and one 3dB divider. With the new solutions only 2 filters are needed, resulting in a substantial reduction...
The reflected group delay method of designing filters is demonstrated for the first time on a four pole quasi-elliptic filter requiring cross coupling. A design procedure is proposed that involves creating optimization curves from a lumped element filter and involves using these curves to design a microstrip filter. To validate the proposed design procedure, a microstrip filter with a center frequency...
Conventional tunning mechanisms for evanescent-mode cavity resonators include changing a gap size through MEMS-based structures. In this paper, for the first time, we propose a technique for adjusting the resonant frequency of these resonators by using a nano-plasma region. For this aim, a sufficiently large DC field is applied which generates a nano-plasma layer inside the gap between the loading...
A novel microfluidic-based approach for realizing highly reconfigurable bandpass filters is presented. The filter topology employs open loop resonators that are capacitively loaded with metallized glass plates. By using microfluidics, the metalized glass plates can be repositioned over the resonators to control the amount of capacitive loading and provide the frequency tuning capability. For the presented...
This paper presents a design method for resonator-type bandpass SAW filters that results in significantly larger bandwidth than what is currently possible with traditional SAW filter synthesis approaches. Unlike traditional lattice/ladder-type SAW filters, this method employs SAW resonators of a single resonant frequency and therefore reduces the complexity of SAW filter design. The proposed coupling-matrix-based...
A new method is presented for integrating high performance wire-based inductors into thin, planar, chip-scale formats. The method is designed for compatibility with commonly-used rapid prototyping tools, and fabrication can be automated for volume production. The chip-scale inductors are designed for inductances in the 1–10 nH range, self-resonant frequencies above 5 GHz, and quality factors exceeding...
This paper presents a new application of absorptive bandstop filter for absorbing the LO-to-RF leakage of mixer in a Q-band heterodyne receiver. The proposed absorptive bandstop filter (ABSF) is achieved by introducing lossy quarter-wavelength resonator to a conventional narrowband bandstop filter. In order to facilitate the receiver system integration, the proposed ABSF is implemented in commercial...
Aperture tuned antennas are becoming more common in Smart Phone Handsets to address radiated efficiency issues caused by industrial design constraints and increased frequency requirements. This paper focuses on a real application example of a MEMS Digital Variable Capacitor (DVC) from Cavendish Kinetics in antenna aperture tuning. The OTA performance is bench-marked against using state-of-the-art...
This paper describes the use of microfluidic microwave sensors for measuring the length, volume, speed and dielectric properties of different liquids in a segmented flow. The sensor is a variant of the split ring resonator, operating around 4 GHz, realized in a microstrip implementation. Changes of the resonant frequency and quality factor are performed when a segment enters the sensing region, in...
A new compact tunable microstrip diplexer based on varactor-tuned dual-mode stub-loaded resonators is investigated. By using the dual coupling paths, the two channel filters can then be designed independently. In addition, by properly varying the dc bias voltages applied to the varactors loaded onto the dual-mode resonators, the passband frequencies of the diplexer can be changed over a wide tuning...
A passive, magnetic field sensor consisting of a 425 MHz surface acoustic wave device loaded with a giant magnetoimpedance element is developed. The GMI element with a multilayer structure composed of Ni80Fe20/Cu/Ni80Fe20, is fabricated on a 128° Y-X cut LiNbO3 LiNbO3 substrate. The integrated sensor is characterized with a network analyzer through an S-parameter measurement. Upon the application...
The transmission properties of a compact circular corrugated waveguide system are investigated experimentally in the WM-380 band from 500 to 750 GHz. Up to 700 GHz, the average transmission losses range from undetectable to 3.4 dB/m, which is more than four orders of magnitude lower than in rectangular waveguides. The propagation of the lowest-loss HE11 mode is found to be dominant, and long-term...
This paper introduces a new physical interpretation of a frequency-dependent source/load (S/L) coupling to multi-mode filter designs, thereby successfully generating (N + 1) transmission zeros (TZs) greater than the number of resonant modes N. It is made clear by a transmission-line based analysis with the help of a parameter-extraction technique that the frequency-dependent S/L coupling essentially...
Mid-range wireless power transfer can be achieved by considering suitable resonators coupled via their reactive magnetic field. Network theory can be used for their theoretical modeling, but full-wave CAD is required for accurate design. For the time being, optimization of wireless power transfer systems has been realized only experimentally. In this paper, we present an efficient way to implement...
A new bandpass power divider (PD) with high frequency selectivity and good in-band isolation has been investigated. By introducing parallel-resonant circuits into a multiple-section PD, both bandpass and power dividing properties can be well realized. Besides, the special configuration also provides a good in-band isolation performance. For the demonstration, a microstrip PD with fourth-order bandpass...
A compact, high-selectivity, and high-isolation microstrip quad-channel diplexer has been presented in this paper. By introducing multiple coupling paths between input and output ports, the diplexer design is, therefore, more flexible and can be extended to higher-order multiplexers. In addition, no extra matching network is needed for this design, resulting in a smaller circuit size. For the demonstration,...
Tunable high-Q intrinsically-switchable quasi-absorptive bandstop filters are presented in the 4 GHz to 6 GHz and 6.3 GHz to 11.4 GHz frequency ranges. Their responses can be reconfigured between all pass and tunable bandstop filter responses by simply tuning the center frequency of their resonators, avoiding insertion loss and control voltages associated with the series switches required in conventional...
A novel vertical stepped-impedance resonator (SIR) is proposed based on the conventional multi-layer printed-circuit board (PCB), exhibiting high unloaded quality factor (Q = 185), compact size and low electromagnetic (EM) coupling to nearby RF circuits. The proposed resonator is used in a 2–3 GHz 4-pole tunable bandpass filter. The resulting filter occupies a footprint of 13 mm × 15 mm and covers...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.