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 low-cost technique for simulation-driven design optimization of compact branch-line couplers (BLCs) is presented. In the first stage, the coupler cells are individually optimized using a pattern search algorithm. In the second stage the entire coupler structure undergoes a fast tuning exploiting fast surrogate model, constructed from cascaded local response surface approximations (RSAs) of the cells...
In this paper, an original solution for dielectric wide bandpass filters is introduced. A 4-pole filter based on the TM01δ mode has been designed in a single piece including resonators and coupling elements. The dielectric part is based on a high permittivity material (Zirconia) and has been manufactured using additive manufacturing technology (stereolithography). The breadboard shows a Q-factor around...
High Power handling capabilities are not the main focus in MEMS varactor research and development. In this paper MEMS varactors with excellent RF power handling capabilities of up to 16 VPP for application in low noise wideband RF VCOs (Voltage controlled oscillators) have been designed, fabricated and characterized. These MEMS varactors are embedded in the BEOL (Back end of line) metallization stack...
This paper presents the design and fabrication of a compact low phase-noise × band voltage controlled oscillator (VCO). The prototype is designed based on closed loop topology and includes GaAs PHEMT MMIC, a novel shielded high dielectric cavity resonator, microstrip low-pass filter and phase shifter network. To achieve low phase noise oscillation, a compact two port high dielectric cavity resonator...
Integration of radiofrequency micro-electromechanical (RF MEMS) tuning modules into a tested planar microchamber for agile biosensing pursposes is investigated. It is found that present MEMS chips enable enhancement of the achievable sensitivity in common sensing scenarios and without adding to technological complexity, although over a relatively narrow frequency range. Dedicated RF MEMS modules with...
The space mapping technique is used to correct manufacturing tolerances related to the production of circular-waveguide dual-mode filters. The tuning screws placed inside each cavity are replaced by fixed square insertions that can be fabricated in separated pieces. A series of these insertion pieces are designed following a space mapping technique, and are then fabricated, thus being able to progressively...
This paper presents the application of switchable inductive tuning technique to the frequency tuning range (FTR) enhancement for millimeter-wave oscillators. By rearranging the induced-current path in the guard ring of a planar inductor, the inductance value can be changed and therefore the resulted total tuning range of the oscillator can be extended. Two VCOs are fabricated for demonstrating the...
We report on a resonantly-coupled wireless power (RWPT) system for locomotion of a seat in an automobile environment. The seat moves transversely 28 cm, resulting in a time-varying geometry and coupling. In addition, the proximity of a metallic undercarriage creates the potential for interference and additional loss. We present a system that was able to achieve 80% efficiency over the entire 28 cm...
This paper presents the design and implementation of a high-Q bandpass filter using a tuning technique that maintains constant Q value over a relatively wide tuning range. The traditional technique for tuning combline filters is achieved by changing the gap between the post and the tuning disk. Such technique is known to yield a Q value that degrades considerably at the lower edge of the tuning range...
This paper presents a novel type of tunable band-pass filters with constant bandwidth and wide tuning range. A constant absolute pass-band has been obtained by integrating a low-pass filter at the input and the output of the filter. The filter fabricated on duroid substrate can be tuned from 690MHz up to 1130MHz, by using RF-MEMS switches mounted in series with fixed capacitors. Matching is better...
This paper presents three examples of adjustable planar filters with wire-bonding technology. These filters are derived from conventional parallel-coupled line filter topologies by introducing tuning cells with bond-wires. The first example is a band-pass filter at Ku band. The second example is a stop-band filter at C band with a wide pass-band, until K band. The third example is a switched pass-band...
In this paper we present the design of Liquid Crystal filled waveguide resonators. Waveguide resonators achieve higher Q-factors then planar technologies, and form the basis for filters of smaller bandwidth. Two possible approaches for positioning the Liquid Crystal inside the cavity are discussed. One of this approaches is designed to fulfill the requirements for mechanical and temperature stability...
A continuously electrically tunable composite right/left-handed leaky-wave antenna based on liquid crystal is presented for Ka-band applications. The antenna features one dimensional beam steering capabilities for a fixed operation frequency. Simulations, vectorial network analysis, and far field measurements of a built prototype are presented in this work together with the detailed fabrication process...
A low cost, fully planar tunable oscillator with a low phase noise, high DC-RF conversion efficiency for C-band is presented in this work. The proposed oscillator utilizes a novel complementary coupled resonator based on substrate integrated waveguide (SIW) that has a broad tuning range of 8.84% relative bandwidth, and thereby achieves a continuous tuning oscillation range from 4.85 GHz to 5.1 GHz,...
I received my original copy in 1964, and I set my self to the task of essentially memorizing the contents, but the small matter of military service intervened. About 3 years later, I was able to obtain some of the Ft. Monmouth sponsored and reported material that had been assembled as the backbone of this great book, and returned to my studies of this “Book of Knowledge”. I cannot say that the entire...
In this paper, a wide tuning range push-push voltage-controlled oscillator (VCO) implemented in the TSMC 0.18µm CMOS process technology for V-band applications is presented. By adopting source degeneration inductors, the characteristic of the overall LC tank is improved and a wide tuning range can be achieved with a larger size of the varactor. The output signal with frequency which is twice of that...
This paper presents a novel approach to realize a low-cost wide tunable Whispering Gallery Mode (WGM) resonance-based structure at Millimeter-wave and sub-THz range of frequencies. The tunability is achieved by moving a metallic structure over the WGM resonator using a micro-positioner. Perturbing the WGM resonance causes shift in the resonance frequency and the coupling. Two types of perturbation...
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.