The-_Half-Wave_-Term-Means-That-The-Length-Of-This143

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The-_Half-Wave_-Term-Means-That-The-Length-Of-This143

  1. 1. The "half-wave" term means that the length of this dipole antenna is equal to a half-wavelength at the frequency of operation. It is wellknown that the centre of a half wave antennais approximately 73 ohms impedance. That is why the formula for a half wave (in feet) is 492/F while the formula for a half waveantenna is 468/F (assuming a thin conductor).As the conductor is made thicker, the element will need to be even shorter. If the half wave antenna is ground mounted and you have a ground rod, thats where the currents will go. This will give a good SWR but be more loss because of the power being dumped into the dirt.antenna
  2. 2. Device antennas are typically designed as quarterwave or half wave Asa rule of thumb, quarterwave antennas require a ground plane but halfwave antennas are ground plane independent and do not need a groundplane to operate
  3. 3. However, most M2M antennas show improved performance with alarger ground plane The Delta 9 is a half wave whip antenna with SMAmale connector
  4. 4. The Delta 9 is overmoulded in black engineering plastic offering a UVand weather proof resistance to the half wave whip tuned to 433MHz viaits SMA male connector Offering a wide frequency range, the Delta 9is also suitable for operating between 428 and 438MHz in radioinstallations capable of transmitting up to 35 Watts power
  5. 5. have been producing and souring antennas and cable assemblies forover 10 years We supply and Cables globally to many of the worldsleading organisations
  6. 6. antenna
  7. 7. antenna

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