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17 Threads found on edaboard.com: Resonant Frequency Shift
I see possible approach to make the primary circuit non-resonant (omit C1) so that the secondary resonance shows more clearly in S11. For low coupling factors, de-tuning by L1+Z0 is small but still present.
Hi! I am currently designing a dielectric resonator oscillator (DRO) with a fixed 4GHz frequency. I acquired some dielectric resonators and fashioned a cca. 50ohm microstrip line with 2 SMA connectors on its ends. I plugged the connectors into a vector network analyzer and placed a dielectric resonator cylinder next to the line, but however I mo
Hi My question is simple: I've read in several articles and AN-s that the resonant frequencies of a SAW resonato (whose equivalent circuit can be aproximated by an RCL with a C in parallel) can be shifted by adding a parallel C or a series C. Being resonant frequencies given by the properties of the SAW material and being the electric (...)
Does changing the matching affects the resonant frequency. Suppose if i am using a circuit which is resonating at 3 Ghz. Now i want to use this @2.45 Ghz. So now if i design a matching network to match this to a 50 ohm line @2.45 ghz. We will see more power @2.45 GHz. but will this change the resonant frequency too.
You could use a PLL with an LC tuned oscillator and Varicap possible and measure the voltage with a coarse adjustment to get the VCO in the sensitive range referenced against a fixed OSC at the highest practical resonant frequency. Otherwise you can drive a fixed frequency and measure the phase shift with L in a tank (...)
The frequency of a blocking oscillator like that depends on the rate of current rise through the primary winding, until the core saturates. frequency depends on the applied voltage, the inductance, and magnetic characteristics of the core. Nothing you can do to slow it down except use a much larger higher inductance transformer. Its not really re
The circuit you copied has a crystal for selecting the frequency, you are using an LC circuit. It is difficult to get a crystal to oscillate at anything other than its resonant frequency - they are pretty difficult to "pull" very far. An LC resonant circuit is very easy to shift the (...)
tuning range is the amount of resonant frequency shift could achieve by changing reactance. % bw is{ /reasonant frequency of patch (Fc)} X100 (the Fh and Fl values are to be taken on return loss plot at -10dB .while Fc is frequency with min. return loss)
triple band frequency shift? I changed the length of the slot and it changed from single to dual band and I dont know why. A slot antenna is a dual structure to a dipole. It has therefore a similar radiation pattern. Like dipoles, slots are often considered to be resonant antennas, with an optimum length equal to
Dear fvm. Thanks a lot for response,I mean to say that like other resonant (LC),one can observe its resonance curve on it possible to look the RC resonance curve like bubba oscillator on oscilloscope.Moreover if it is possible ,may it be simulated in proteus like other curves. I also want to bother you for one more question explaini
the mains psu appears to be using a phase shift bridge so there are no switching losses on the mosfets - it appears not to be a parallel resonant converter - rather standard phase shift - Regards Orson Cart.
If you have an antenna that can intercept the RF signal and couple it into your 1-port resonator, then you will have a phase shift in the reflected signal. The phase shift will be in one direction if your interrogator frequency is above the resonant frequency, and the phase shift will be (...)
Greeting. I am using CST studio 2010. Currently I am designing a planar antenna for dual band GSM and single band WiFi. I am modifying a triband antenna from an example, whose S parameter value are very prefect, just the frequency values are not accurate. I wish to shift the frequency graph to my desired frequency (...)
Hi heviraf, The shift in resonant frequency is not too large (less than 2%). Differences of this order can come from simulator accuracy, dielectric constant tolerance, etc. Other factors (substrate thickness tolerance, finite ground plane) have influence too. Was the measurement performed in real free space or anechoic chamber? Regards Z
You will find lots of information using GOOGLE, but in short: The LC part forms a resonant circuit at the calculated frequency. Any resonant circuit will introduce phase shift. The phase shift introduced plus the added phase shift of the amplifier will cause oscillations when the signal is (...)
Hi, Sumy: How much shift the resonance frequency is? If the shift is small, it is normal. Just like you connect a feed line to a patch antenna, if the feed line slightly off 50-ohms or the ohms you want to normalize, the resonant frequency may shift slightly and the matching may differ (...)
Hello Redhat, The easy way to design VCO is to use your resonant circuits and amplifier at the loop with no real negative impedance amplifier . With elements you can adjust resonant frequency that is shift 0 or 180 degree or what is necessary it depends of amplifier type in feedback loop.The simple solution is to use (...)