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  • Two-element assembly of measuring antennas for a 1-12.75 GHz frequency range
    In this. case, it has appeared. that the low fre- quency and high kequency logperiodic antennas (LPA- LF and the LPA- HF ) should consist of 14dipoles.
  • A low cost extension of spectrum analysers to dosimeters
    A picture of the Hyperlog 7040 antenna and the Spectran HF -4040 can be found in figure 1. .... The characteristics of a logperiodic antenna are a broad frequency range, moderate size, directivity, low cost, and…
  • THz Josephson spectral analysis
    The admittance of vered from the dc I-V and dV/dI various applied magnetic fields Logperiodic geometry of the separation of vibrators in in logarithmic periodicity of a antenna admittance. .... of radiation, art in the form of an odd- d the voltage V = hf /2e. u3O7-x .
  • A description of the hardware element of the NASA EME flight tests
    HF source. .... This system was a trailer mounted equipmentcontainerthat held a 1kW transmitterand a log periodic antenna . .... The logperiodic had a gain of 7.5 dBi and couldbe positionedin either verticalor horizontalpolarization.
  • Wire grid modeling with interactive graphics
    Figure 1 shows a model o f an E6-A a i r c r a f tw i t h HF antenna . .... and logperiodic antennas.
  • Electromagnetic Compatibility in Railways
    Other radio sources may be found in the HF band (between a few MHz and a ten … an amplitude modulated signal fed from a RF signal generator to an amplifier and then an antenna . .... For the normally used antennas (biconical and logperiodic antennas) the electromagnetic field is applied in both polarizations…
  • Log periodic dipole arrays
    …of “all-wave” rotatable beams of very low cross section for usein the hf to uhf spectrum. .... I4 I. INTRODCCTION OG periodic antenna design has been the subject of several papers over the past .... ~ - ~ Logperiodic antenna designs are available, for example, which pro- videomnidirectional,bidirectional,orunidirectional radiation patterns and…
  • Introduction to Electromagnetic Compatibility 2nd Edition Complete Document
    In the measurement of radiated emissions for compliance verification, the biconical antenna is typically used in the frequency range of 30 – 200 MHz, whereas the logperiodic antenna is typically used in the remainder of the band from 200 MHz to 1 … cones (assumed free space), J ¼ 0, ~ ~ ^ ^~ ^ ¼ Hf af and E…
  • Antenna Parametrization for the Detection of Partial Discharges
    The energy in detail 5, mostly corresponding to DAB radio, and the approximation, HF band, is also .... Therefore, the zigzag antenna is working in bands where the environmental noise is important and which hide .... The logperiodic antenna is a good reference to compare the results, although its response is not so…
  • A review of Chinese designed surveillance radars-past, present and future
    %& logperiodic elementa.vertical polarization Diredive gain 26dBfat 14.!5M&) Azimuth beamwidth 6" (at 14.6MHz) Scanning .... Another branch of HF OTH-B radar, the Gr- ound Wave Radar. has also been researched and … lzl- Vertically polarized ground waves transmit- ted by an on-shore broad beam antenna of the HF…