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Let's say we have high Q resonator used in reflection configuration. What concerns me is that huge dip in S11 absolute value at resonant frequency is near center point on a Smith chart. I may be wrong, but isn't it then impossible to use resonator at exact resonance frequency? I mean that we...
1. What software is used?
2. How technology is selected? For example, if design contains 4-push oscillator with 10GHz output, would 2.4GHz process be enough?
3. How S-parameters are obtained? Through simulation? As i understand there may be some "standard" FET transistor, and it is used...
Re: What is RLC equivalent circuit of cavity resonator, Series or parallel RLC?
I will post images as soon as possible. Now some question, writing from phone. Assume I use transformer (pins 1,2 on one side and 3,4 on isolated side) and parallel RLC to create equivalent schematic of resonator...
I will try to add a little distance, around 0.3mm. I want get rid of DC because it gives spikes/ringing to my modulating waveform. Filtering makes transition too slow (FSK modulation)
Re: What is RLC equivalent circuit of cavity resonator, Series or parallel RLC?
I have another related question. At resonance parallel RLC circuit acts as an open-circuit with some R resistance to ground. And in several sources I read than active device sees such resonator as an open-circuited...
vfone, here is layout of passive part (DR + FET transistor as a varactor):
I did some stub tuning, especially drain stub. Now it works much better, current from drain to ground is less than 0.01mA (10uA) now.
Maybe it is because DRAIN and SOURCE pins being not perfectly grounded at RF. It...
Update: if i disconnect varactor from tuning voltage and measure current between varactor and ground, it is around 5mA. If dielectric resonator is removed, current is 0mA. Maybe there is too strong coupling between varactor half-wavelength line and DR? My oscillator consumes around 30mA. So 5mA...
What is RLC equivalent circuit of cavity resonator, Series or parallel RLC?
From my understanding equivalent ciruit of cavity is parallel RLC circuit, the same for dielectric resonator or metal cavity resonator. But some authors use series RLC circuit in their work. Isn't S11 responce of both...
Assume we have TE101 waveguide resonator. Can I assume that S11 angle of this resonator is around -180 degree, using analogy with half-wavelength microstrip line which is shortened to ground on one end? Is it correct?
Some time ago I read about laser sensor which used ICs that designed for handheld radios. And those radio usually below 1GHz frequency, something around 400MHz. I think diode must handle frequency a little higher than that. You can google laser sensor teardown pics. Not sure if it related to...
I am short on equipment. Frequency is 10GHz, currently using FSK modulation with step of 2MHz (max theoretical distance is 74.9m without direction sensing or 37.5m with direction sensing). Please comment on far zone distance? Do you mean transition from near field to far field? I thinked about...
I am currently have a problem with my monopulse sensor. It is classical design with one TX antenna and two RX antennas. The main difference is that I use passive FET mixers instead of classical Schottky diodes. Distance between RX antennas allow to measure angles in range -45...+45°, but...
FSK modulation could be used to measure distance to moving objects, for example walking person. While testing a prototype FSK VCO with receiver I experienced one problem: if FSK switching frequency is near sampling frequency then there is a huge interference occurs, because FSK switching...
I am thinking about equipment required for microwave sensor radiation pattern measurements. Setup is: (1)room with microwave absorber, (2)microwave sensor is placed on a (3)rotating platform. (4)Receiving antenna connected to (5)spectrum analyzer. Rotating platform and spectrum analyzer are...
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