Products/Services for Logperiodic HF Antenna

  • Antennas-Image
    Antennas - (1100 companies)
    ...a highly-directed transmission. Image credit: PTub. Log-periodic antennas, which are multi-element, unidirectional, narrow-beam antennas that have impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation...
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    Antenna Mounts - (25 companies)
    Antenna mounts are used to hold and support antennas of all sizes and shapes. The antenna collects the electromagnetic signal and sends it to the receiver. There are many types of antennas and mounts including for radio, television, global...
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    Antenna Design Software - (10 companies)
    Antenna design software is used for the design and electromagnetic analysis of all types of antenna systems, including planar and microstrip antennas, hollow waveguide and horn antennas, and helical antennas. Some applications for antenna design...
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  • Chip Antennas-Image
    Chip Antennas - (58 companies)
    Chip antennas are semiconductor ICs used to collect or radiate electromagnetic waves. Chip antennas are a particular type of antenna valued for their small footprint. They are most commonly integrated in circuit boards to radiate high frequency...
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    Radomes - (26 companies)
    Radomes are weatherproof enclosures to protect an antenna from the elements. Radomes are more typically used on satellite or microwave antennas, but can be used with any antenna. Radomes are structures or enclosures designed to protect an antenna...
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    Wireless Systems - (304 companies)
    Wireless systems consist of combined RF components such as transmitters, receivers, transceivers, filters, down / up converters, antennas and antenna positioners. Wireless Systems Information. Wireless systems consist of combined RF components...
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    SWR Meters - (9 companies)
    ...is a measure of the quality of the match between the antenna and the receiving system. VSWR is the ratio of the maximum voltage to the minimum voltage on an electrical transmission line. In other words, it is a measure of the impedance mismatch between...
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    RF Amplifiers - (558 companies)
    RF amplifiers are devices that accept a varying input signal and produce an output signal that varies in the same way, but with larger amplitude.
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    RF Headends - (23 companies)
    RF headends are electronic control centers, generally located at the antenna site of a system, which includes the antenna, preamplifiers, frequency converters, demodulators and other related equipment. RF Headends Information. RF headends...
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    RFID Transceivers - (37 companies)
    ...of rewriting the tag's functionality. Since the frequency of the tag is directly related to the geometry of the antenna, the frequency which it uses cannot be changed, but the depth of its modulation is adjustable. One of the central advantages...
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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.
  • History of International Broadcasting, Volume 1
    In the late 1960s, the advent of the logarithmic-periodic antenna and its application to HF communications was later followed by its application to SW transmitters with powers of up to 100 kW or so. The horizontally polarised logperiodic , with its single-mast support, was found to be suitable for a rotatable …
  • 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 …
  • 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 …


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