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Thank you all for the great inputs. Especially thank Peter for pointing me to the right direction - the nature of normal mode helix for this type of antenna.
Like you guys pointed out, I don't expect any gain from this antenna. It's more like just make it resonate at 44MHz so it can radiate...
I need a rubber ducky antenna working at 44MHz, how should I start? Is there any book discussing the design of this type antenna? Any equations to calculate the parameters such as coil diameter, number of coil turns, etc? Thanks in advance.
madengr,
Thanks for suggestion, but it seems not change much at all. Here are the new structure and simulation results. Do you have any other suggestion? Thanks.
I simulated some on-chip spiral inductors and the resulting inductance alternates twice between positive and negative values. Could anybody tell me what's going on? Is it because something wrong with simulation settings or need some special handling? Thanks.
Hi all,
My application is a satellite receiver with only one channel (not multi-channel application). Bit rate of digital message is 400bps. The specification says: "The data are encoded biphase-L or Manchester. The carrier is phase-modulated positive and negative 0.8 +/-0.025 radians peak...
Re: Noise of RF Switch
I think for passive components, we can say the insertion loss equals to the noise figure. However, RF switch is electronic switch, it's active device. I'd like to know how much noise it will generate as an active device instead of how badly it will decrease the noise...
Noise of RF Switch
biff44,
First, thank you very much for your quick reply. To be honest, I don't know why the noise is not an issue. If I guess, it's because the on-resistance is very low, thermal noise will be very small. Am I right?
Among the specification parameters of RF swithes from varous manufacture, there is no noise parameters. Even in simulation tools like Genesys and ADS, the noise performance is not specified for RF switches. I just wonder if the noise isn't important for RF switch?
In my project, transmitter...
I want to develop a data acquistion device which uses USB to communicate with PC. Do I have to use a microcontroller to implement the USB protocol? I am new to USB field, so please forgive me for my silly question.
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