Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: lewisFeng
  • Content: Threads
  • Order by date
  1. lewisFeng

    Easier way to realize a 2FSK LO in Xband

    Dears, My current solution is Generate it at DDS and then modulate on L-band, then up-convert to X-band. This solution need a lot of components include a dds, two PLL, two Mixer and lots of amplifiers and filters and attenuators. Because the 2FSK modulation is two simple, I'm wonder if there is...
  2. lewisFeng

    DSRC

    Hi, do anyone has the experience of DSRC on board unit design? I'm looking for the state of art product. I only see Savari's website. Do there any system exactly base on the latest IEEE 802.11p amendment 6?
  3. lewisFeng

    Modification of IPhone5

    Dear friends Now I'm doing a project to add the third RF path to Iphone5, for it can't accomplish the task of SVDO (simultaneous voice and EVDO). This is a big problem for subscribers using Verizon and Sprint's network. You may know the orientation of antennas on Iphone, to describe it clearly...
  4. lewisFeng

    Gap waveguide from millimeter wave up to THz

    Do anyone noticed the new technology of gap waveguide? I don't expect metamaterial go that far. It seems this type of waveguide is suitable for integration of MMICs and antenna above 30Ghz. But I don't see any large antenna array realized in this technology. It mostly appeared in Gothenburg's...
  5. lewisFeng

    High isolation of side by side subarrays

    Dears In microwave and millimeter communication, diplexer is used for division of TX and RX. But one of our supplier provide a solution by two high isolated side by side subarrays. By the 75dB~90dB isolation(with same polarization), the diplexer can be obviated. I guess this merits is obtain by...
  6. lewisFeng

    Artificial magnetic conductor in UHF

    Dear, Is there anyone familiar with Artificial magnetic conductor(AMC)? I'm design ultra-low profile antenna in UHP, I need this material to use as ground plane. In this paper the AMC is manufacture by a dielectric substrate MCT-25 with relative dielectric permittivity 25 in 2.54mm thickness. Do...
  7. lewisFeng

    Acoustic interaction measurement

    I need measuring two buzzer working on 40Hz to verify the interaction to the circuit and SPL. Below is my test schematic figure, I planed to use the free version of TrueRTA to measure the SPL, do any suggestion? should I prepare rheostat or variometer or varicapacitance to measure the impedance...
  8. lewisFeng

    60Hz to 40Hz transducer

    Dear professionals I need to build a power tranducer to drive a eletromagnetic buzzer.The residential electricity in USA is 110V 60Hz, I need the output to be 110V 40hz in square wave with with limited output current. How can I get the transducer, please help, thank you in advance.
  9. lewisFeng

    Acoustic array of 40Hz

    Finally, I move from Antenna & Propagation to here. I have a project using more than 100 acoustic electromagnetic buzzer to get the strongest pressure at a 3m away target. Actually the buzzer is acoustic small at 40Hz, about 25mmX25mmX25mm in size. According to the requirement the array can not...
  10. lewisFeng

    Acoustic array of 40Hz

    Do anyone here have the knowledge about acoustic array made up by many microphones. The array will be used for probing of the atmospheric boundary layer. I want to know the best method to simulate it and calculate the mutual coupling effect between elements. Thank you in advance!
  11. lewisFeng

    CTS antenna and Thinkom

    Do anybody hear about the Continuous Transverse Stub (CTS) antenna or Thinkom before? This antenna look like the best candidate for the millimeter integrated radio, depicted as 50% wider in bandwidth, 20% higher in efficiency, 6 to 15 dB lower in sidelobes, 70% lower in profile, 40% lighter in...
  12. lewisFeng

    Where do I get the commercial antenna redome?

    Usually, Microwave point to point antenna use single dielectric to model redome.(e.g. ABS or PC). And the thickness is lambda/2 of the center frequency. In order to reduce the weight of the redome and broaden its bandwidth, we want to adopt the three layer material to cover...

Part and Inventory Search

Back
Top