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Tuning Capacitor
A tuning capacitor is a variable capacitor used in an electronic circuit of a radio, and usually connects in parallel to a loop antenna to form a parallel tuned circuit. There are many uses and applications for a variable capacitor; the most typical use being in an AM/FM ...
Optimizing Performance in RF Tuning Circuits
Varactor (or "varicap") diodes are used primarily in radio-frequency (RF) circuits to provide a capacitance that can be varied by changing the applied voltage. These types of diodes often are used for tuning circuits, such as RF oscillators and filters found in wireless applications like wireless microphones and radios.
Chapter Tunable Filter
Chapter Tunable Filter Di Lu Abstract Tunable filters enable dynamic spectrum access for the wireless systems, and the tunable bandpass filters with constant bandwidth (BW) are most favorable for prac-tical applications. This chapter investigates the synthesis and
Chapter Tunable Filter
the variable capacitor in the planar tunable filters to alleviate the Q factor deterioration [20,24–26].Asidefromtheplanarfilter,thehigh-Qtunablethree-dimensional(3D)filter ... When the filter is tuning (tunable frequency or tunable BW), there are numerous filter prototypes (filter matrices) corresponding to the same filter
Components—Part 3: The Performance of LC Filters｜Intro to …
Components—Part 3: The Performance of LC Filters
Chapter Tunable Filter
the end-loading capacitors (or equivalent capacitors) of each coaxial resonator, the coax-ial filter can be tunable with a wide tuning range [7 –10]. The reconfigurability of the …
Continuous frequency and bandwidth tunable combline cavity bandpass filters with internally mounted …
Thus, a filter with resonant frequency tuning capabilities can be realised without the need to increase the filters overall volume. Incidentally, the same actuation technique can be performed on a dielectric material – tuning the effective absolute permittivity between the resonator end and ground.
Mass Tuning Reduction Method for Vibration and Audible Noise …
Filter capacitors are among the most serious noise sources in HVDC converter stations, and there are still no satisfactory noise reduction measures. This paper proposes the use of the mass tuning (MT) method to adjust the vibration frequency response characteristics and to realize vibration control and noise reduction. First, the theoretical model of the MT …
Power Factor Correction Capacitors Sizing Calculations – Part …
The KVAR of capacitor will not be same if the measured voltage and frequency applied to the capacitor changes, ... Tuning frequency (Hz) * Blocking factor (P %) Tuning number (n) 215 5.4 4.3 189 7 3.78 135 14 2.7 *With network frequency 50 Hz, Where: n r /f ...
The Many Jobs of a Capacitor in RF and Microwave
The Many Jobs of a Capacitor in RF and Microwave
11.10: Switched-Capacitor Filters
Tuning is accomplished by adjusting the frequency of an external clock signal. The higher the clock frequency, the higher the resulting critical frequency. These ICs offer a convenient "black box" approach to general …
Harmonic Filter Selection
The passive filter has passive components like a resistor, inductor, and capacitor. The active filter is designed using semiconductor devices like IGBTs. ... For 5 % detuning Fr=50/√ 0.05 = 224 Hz Where f s = Fundamental system frequency. Filter frequency with de-tuning. De-tuning Factor (%) Filter Frequency (Hz) 5: 224: 7: 189: 8: 177: 14: 134:
Single-tuned Passive Harmonic Filter Design Considering …
An ideal single-tuned filter is said to be tuned on the frequency that makes its inductive and capacitive reactance to be equal[5]. The quality factor(Q) of filter …
RF MEMS electrostatically actuated tunable capacitors and their …
In another work [], they fabricated 16 state variable capacitor together with fixed capacitors and demonstrated a tunable filter for Ultra-high frequency (UHF) and Very High Frequency (VHF) bands. To realize a tunable capacitor, a fixed capacitor is connected in series with a capacitive switch for a two state capacitance as shown in …
Harmonic Filter Selection
Harmonic Filter Selection ·The frequency of the 5th and 7th order harmonics is 250 & 350 Hz respectively.The tuned filters can be installed Though all orders of harmonics harm an electrical power system, the 5th and 7th order harmonics …
Fully Integrated High-Q Switched Capacitor Bandpass Filter with …
DOI: 10.1109/RFIC.2007.380974 Corpus ID: 16996251; Fully Integrated High-Q Switched Capacitor Bandpass Filter with Center Frequency and Bandwidth Tuning @article{ElOualkadi2007FullyIH, title={Fully Integrated High-Q Switched Capacitor Bandpass Filter with Center Frequency and Bandwidth Tuning}, author={Ahmed El …
Tunable Radio-Frequency Filters Using Acoustic Wave
In this paper, we describe possible configurations for tunable filters based on RF surface or bulk acoustic wave (SAW/BAW) technologies. The frequency tuning is made possible by variable capacitors (VCs) connected to SAW/BAW resonators in the ladder-type filter configuration. First, it
Tunable RF MEMS Filters: A Review | SpringerLink
To achieve frequency tuning, a tunable capacitor bank was employed in each resonator section, which consisted of one fixed capacitor (MIM capacitor), one continuously-tunable capacitor, and three capacitive switches. ... By inserting the RF MEMS switching network inside the dielectric resonator, a tunable filter tuning from 5.20 to 5.02 …
A Novel Frequency Tuning Scheme for a C-Type Filter Based on …
In this paper, we find that the tuning frequency of the C-type filter may not exist and reveal the existence conditions. Different from single-tuned filters, the best …
An Introduction: Various Types of Tuning Capacitors
Tuning capacitors are adjustable electronic components crucial for fine-tuning resonant circuits to specific frequencies. They consist of two conductive plates …
Mass Tuning Reduction Method for Vibration and Audible Noise of HVDC Filter Capacitors …
Filter capacitors are among the most serious noise sources in HVDC converter stations, and there are still no satisfactory noise reduction measures. This paper proposes the use of the mass tuning (MT) method to adjust the vibration frequency response characteristics and to realize vibration control and noise reduction. First, the theoretical model of the MT …
Can any capacitor bank be used?
In this article, we will explain how the installation of a capacitor bank is in itself a change in the electrical installation; a change in which a poor choice of capacitor bank could destabilise the system due to the harmonics; causing serious problems in the capacitor bank itself and in the installation, with resulting downtime and considerable financial losses.
RF MEMS electrostatically actuated tunable capacitors and their ...
For example, the phase noise in the frequency tuning of VCOs, ... Furthermore, when implementing the tunable capacitor into a two-pole UHF filter, tuning over a 225–400 MHz range was achieved with a loss below 6.2 dB. Another comb drive tunable capacitor was presented by Zhejiang . They proposed a comb drive tunable …
A Full-Tuned Filtering Method for Dynamic Tuning Passive Filter …
The ST passive harmonic filter, also called the bandpass filter, is widely used in the power system. This filter consists of an inductor and a capacitor, and these two components give rise to a series …
TUNED CAPACITOR BANKS-29NOV06
But never mind the tuning point and let''s look at the rating of the capacitors used in a filter configuration: If tuning to the 5th harmonic or close to it, the voltage rise on the capacitor due to the series reactor will be of about 4%. If tuning lower, like at the 3.78th harmonic, the voltage rise will be of about 7%. But in any case, the
Decoding Detuned Reactors : What and Why
Decoding Detuned Reactors : What and Why - ...
Switched-Capacitor Low-Pass Filter with Pole Frequency Tuning at Constant Frequency …
The circuitry of a switched-capacitor low-pass filter (SCF) is considered, in which it is possible to tune the pole frequency without changing the capacitances of the switched capacitors, for example, by selecting them of the same kind. To study the suggested SCF circuit, the analysis in the time domain was used, and the obtained characteristics of the …
A Simple Digitally Tunable Active RC Filter | Analog Devices
The tuning of the cutoff frequency (f CUTOFF) of an active RC filter can be implemented using switched-capacitor circuits or continuous time circuits. In applications that require …
Design and tuning of superconducting filter at VHF-band with mechanically switchable interdigital capacitors
Conclusion Interdigital capacitor array and mechanical switches are incorporated into an HTS microstrip resonator to increase the frequency tuning range while introducing little loss. A tuning range of 1 MHz for a resonator at VHF-band, with a fine average resolution ...
Design and application of a single‐tuned passive harmonic filter to ...
The design of the capacitor bank includes the tuning frequency f t and the equivalent capacitance C. The tuning frequency is designed to be 180 Hz, which is the major harmonic component of the traction load. The reactive power at the fundamental of the filter bank was designed to be 2000 kvar.