Georgy.Moshkin
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Today, 08:51Georgy.Moshkin replied to a thread Smith chart of λ/4 Transmission Line in RF, Microwave, Antennas and Opticsblack and red are constant resistance and constant conductance circles16 replies | 446 view(s) -
Today, 08:33Georgy.Moshkin replied to a thread Metamaterial unit cell structure of Metawave's radar used for beam steering. in RF, Microwave, Antennas and OpticsOn the photo it looks like there is varactor at the bottom of each "unit cell":...3 replies | 155 view(s)
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Yesterday, 00:58Georgy.Moshkin replied to a thread Smith chart of λ/4 Transmission Line in RF, Microwave, Antennas and OpticsS22 is s-parameter. What exactly do you want to achieve? studying or maybe designing some device? I think you may start from some tutorials on...16 replies | 446 view(s)
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21st March 2019, 03:15Georgy.Moshkin replied to a thread Smith chart of λ/4 Transmission Line in RF, Microwave, Antennas and OpticsSmith chart uses polar coordinate system with angle increase in counter-clockwise direction. It's just an example. You may start from any...16 replies | 446 view(s)
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20th March 2019, 09:40Georgy.Moshkin replied to a thread Smith chart of λ/4 Transmission Line in RF, Microwave, Antennas and OpticsIn third message i've made a mistake: must be:16 replies | 446 view(s)
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20th March 2019, 07:17Georgy.Moshkin replied to a thread Smith chart of λ/4 Transmission Line in RF, Microwave, Antennas and OpticsMy thoughts on "moving towards the generator" / "moving towards the load impedance" rules. Rules are: 1) Moving towards the generator - clockwise...16 replies | 446 view(s)
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20th March 2019, 04:51Georgy.Moshkin replied to a thread Smith chart of λ/4 Transmission Line in RF, Microwave, Antennas and OpticsFrom Smith chart it looks like Zout ≈ 2 Ohm, Zin ≈ 100 Ohm. Zin may be located at any side depending on actual values. Traverse direction comes from...16 replies | 446 view(s)
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19th March 2019, 13:36Georgy.Moshkin replied to a thread Smith chart of λ/4 Transmission Line in RF, Microwave, Antennas and OpticsDeeper understanding about Smith chart may come from analysis of formulas behind it. Complex impedance transformation may be calculated using...16 replies | 446 view(s)
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19th March 2019, 04:22Georgy.Moshkin replied to a thread Transmission line question and a CPW to microstripp transition question in RF, Microwave, Antennas and OpticsIf you have 50Ω "something" on the other side, then length of 50Ω line doesn't matter as you said. By the way, you may manufacture two prototypes,...3 replies | 104 view(s)
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19th March 2019, 03:35Georgy.Moshkin replied to a thread Transmission line question and a CPW to microstripp transition question in RF, Microwave, Antennas and OpticsOnly if patch antenna and signal source have close valued real impedances, for example 47 Ohm and 52 Ohm are pretty close in 50 Ohm system. You may...3 replies | 104 view(s)
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15th March 2019, 12:05Georgy.Moshkin replied to a thread Metamaterial unit cell structure of Metawave's radar used for beam steering. in RF, Microwave, Antennas and OpticsAccording to https://www.liteon.com/storage/document/template/metawave%20flyer%20final%202017-10-04.pdf beamwidth is 1° ! Kind of small for 8x4...3 replies | 155 view(s)
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15th March 2019, 03:02Georgy.Moshkin replied to a thread Is it really "heating" used for beam scanning in Echodyne's radar? in RF, Microwave, Antennas and OpticsSearched for "heater phase shifter" and found some papers, for example: http://orbit.dtu.dk/files/4359773/Pu.pdf Interesting if something...4 replies | 244 view(s)
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14th March 2019, 05:52akhilpaulv replied to a thread power amplifier design input impedance in RF, Microwave, Antennas and OpticsIf i want to change the VDS value to 32 voltage and maintain the 50 mA Ids then optimum load data given the datasheet will change ?16 replies | 627 view(s)
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14th March 2019, 05:29Georgy.Moshkin started a thread Is it really "heating" used for beam scanning in Echodyne's radar? in RF, Microwave, Antennas and OpticsIs it really heating or just a misinterpretation? reference: https://techxplore.com/news/2016-11-echodyne-metamaterials-drone-sized-radar.html4 replies | 244 view(s)
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14th March 2019, 05:16Georgy.Moshkin replied to a thread Adding ports to know resistance at some point in 2-patch antenna in RF, Microwave, Antennas and OpticsFor 100 Ohm lumped port if you measured some S11: Z=100*(1+S11)/(1-S11) For example, you've obtained Z11 = 153.2 - i*1.912578972 Now if we...1 replies | 112 view(s)
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14th March 2019, 05:01Georgy.Moshkin started a thread Metamaterial unit cell structure of Metawave's radar used for beam steering. in RF, Microwave, Antennas and OpticsDoes somebody know what is structure of metamaterial unit cell used in Metawave's radar provided on the image below? Is it metamaterial radiating...3 replies | 155 view(s)
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13th March 2019, 04:43akhilpaulv replied to a thread FDTD analysis of patch antenna using CST in RF, Microwave, Antennas and Opticshttps://perso.telecom-paristech.fr/begaud/intra/MWS_Tutorials.pdf try the above link1 replies | 133 view(s)
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12th March 2019, 09:06Georgy.Moshkin replied to a thread How to increase printed meandered dipole antenna bandwidth in RF, Microwave, Antennas and OpticsWhat is your antenna central frequency? Google for "wideband fr4 dipole" images, there are many papers with similar configuration. For very wide...8 replies | 354 view(s)
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12th March 2019, 08:59Georgy.Moshkin replied to a thread Mulitple antennas for the same feed line in RF, Microwave, Antennas and OpticsUse SPDT switch or pin diodes. Control voltage for SPDT/pin diodes may be provided by microcontorller, some antenna detector circuit/mechanism or...1 replies | 108 view(s)
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11th March 2019, 07:35akhilpaulv replied to a thread power amplifier design input impedance in RF, Microwave, Antennas and Opticsnow i matched the transistor and added one 6 Ohm resistor in series with the input. Now the transistor is conditionally stable. I matched the...16 replies | 627 view(s)
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8th March 2019, 13:49akhilpaulv replied to a thread power amplifier design input impedance in RF, Microwave, Antennas and Opticsi wrongly entered the impedance value in the simulator. Now i matched both in put and output, still the amplifier is not stable in that region. Can...16 replies | 627 view(s)
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8th March 2019, 04:46akhilpaulv replied to a thread power amplifier design input impedance in RF, Microwave, Antennas and Opticsas per your comment i did the simulation. Still the stability parameter is not greater than one in 900 MHz. The input reflection coefficient is not...16 replies | 627 view(s)
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7th March 2019, 06:13Georgy.Moshkin replied to a thread Question about single balanced mixer design in RF, Microwave, Antennas and OpticsYou may provide schematic for simulation you perform, including microstrip lines. Maybe problem is in schematic. On the third image RFC is probably...2 replies | 197 view(s)
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6th March 2019, 13:10akhilpaulv replied to a thread power amplifier design input impedance in RF, Microwave, Antennas and Opticsi put it for conjugate matching.16 replies | 627 view(s)
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6th March 2019, 10:50akhilpaulv started a thread power amplifier design input impedance in RF, Microwave, Antennas and OpticsHi , i want to design a power driver at 900 MHz. For this application i chose NPTB00004 transistor from maccom. In the datasheet they provide...16 replies | 627 view(s)
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5th March 2019, 17:29Georgy.Moshkin replied to a thread How to terminate microstrip line with Z0 = 50Ω? in RF, Microwave, Antennas and OpticsIf your bill of materials (BOM) have 100ohm resistors, you may use them in parallel and put radial stub as rf ground. Also you may go (by using stubs...4 replies | 323 view(s)
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5th March 2019, 13:19Georgy.Moshkin replied to a thread Question about LNA stability resistor in RF, Microwave, Antennas and Optics20ohm 0805 resistor will be hot at room temperature (150ma). Google for resistor wattage.11 replies | 625 view(s)
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5th March 2019, 06:30Georgy.Moshkin replied to a thread How to terminate microstrip line with Z0 = 50Ω? in RF, Microwave, Antennas and OpticsUse 50 ohm resistor. Connect microstrip line to ground through this resistor. Ground: 1) vias to ground or 2) radial quarterwave stub second...4 replies | 323 view(s)
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5th March 2019, 06:17Georgy.Moshkin replied to a thread Question about LNA stability resistor in RF, Microwave, Antennas and OpticsI suggest to start prototyping on FR4 substrate, it helps a lot, and affordable at these frequencies. Best results may be obtained with vector...11 replies | 625 view(s)
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