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 new microwave photonic signal processor that has the ability to realize a continuously tunable high-resolution notch filter response is presented. It is based on designing the filter impulse response to have a primary and secondary tap distribution. With a proper design on the tap amplitudes, the notch filter passband can be flattened. The filter notch frequency can be also continuously tuned by...
This paper provides the first study of electromechanical non-linearities of MEMS tunable bandstop filters. The studied non-linearity sets a limit on the power handling capability of such filters. A two-pole MEMS tunable evanescent-mode (EVA) bandstop filter is fabricated and measured to validate the non-linear circuit modeling. Good agreement is observed between measurement and modeling. The fabricated...
The basic principle of direct digital frequency synthesizer (DDS) and the design method of active transistor multiplier are introduced in this paper. RF signal source with 40∼160MHz output frequency range is designed,which is realized by DDS and active transistor multiplier. The influence factor of the output power and efficiency of multiplier is analysized. An experimental circuit was fabricated...
Multipactor effect on a dual-mode second-order waveguide filter response is presented. First, a dual-mode second-order waveguide filter using elliptical waveguide irises as input and output coupling is designed and simulated. Then multipactor current density is calculated with respect to the multipactor RF breakdown threshold in the elliptical waveguide irises. The magnetic filed corresponding to...
In this paper, the Adaptive Frequency Sampling(AFS) technique is modified to macromodel the RF components. The conventional AFS can just express the frequency response as a rational function, but ends up with inefficiency in macromodelling So the proposed scheme here enables the AFS to macromodel the problem by finding the equivalent circuit of the frequency response, since the coefficients of the...
Filters are significant RF and microwave components. Lumped element filters are impractical for compact designs of wireless communications equipment, especially hand-held devices. Distributed element filter design offers a much smaller area and profile. With the advent of advanced substrate materials offering high dielectric constants with low loss, the size reduction with preserved efficiency is...
This paper presents a compact RF microelectromechanical system (RF MEMS) tunable filter which is based on electromagnetic bandgap (EBG) structures. The frequency response for the proposed bandstop filter has been investigated through finite element analysis (FEA). By studying the distributions of electric and magnetic fields, we have examined the impact of geometric parameters on filter's centre frequency...
Channel frequency response is one of the banner performance specifications for discrete Fourier transform (DFT) based spectrum analysers. Digital techniques have emerged as most attractive approaches to correct the linear distortion introduced in the microwave and immediate frequency (IF) analogue signal paths. This paper presents a novel technique for correcting the channel frequency response (flattening...
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.