This antenna can be easily used for aresraces groups that spot antennas around for emergency use, since it requires little, if any, mainte nance during its lifetime. Meanwhile, the multilevel fast multipole algorithm mlfma is employed to. Modern antenna design, second edition, by thomas a. It is an implementation of one of the oldest antenna designs. The microstrip antenna designs usually suffer from a narrow impedance bandwidth. Polarization is important because the receiving antenna. Its basically an endfed omnidirectional halfwave antenna, matched to the feedline by a quarter wave transmission line stub. The j antenna goes back many years, long before i became a ham. Wikipedia the j pole antenna is a popular antenna design among amateur radio operators because it is effective and easy to build. The grayhoverman antenna has been designed by doyt r. The buildup of opposite electric charge on both ends of the poles is where dipole the. Categories antennas tags inductance, jpole, simulation, stub, uhf, vhf. True plumbers delight for 2 meters an all copper j pole. Paul, introduction to electromagnetic compatibility, 2nd ed.
The jpole antenna s long and storied design history is due for one more chapter to mitigate the longstanding mast current and reliability issues. The zepp antenna received its name from its use on zeppelin airships. Monopole is a type of the radio antenna formed by replacing. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. A few manual iterations produced suitable left and right distributions to. We will use this wavelength equation for all of our calculations. Analysis of jpole antenna configurations for underwater. This antenna was patented in 1909 by the german, hans beggerow. Design and analysis of dualband jpole antenna with variation in t. However, with some improvements, the antenna can receive well both the uhf as well as vhfhi. The jpole will take about an hour or so out of your day to build and tune, making a great antenna for a vhf base station. On most of the j pole designs out there, a choke should be used as close to the feedpoint of the antenna as possible to help prevent rf on the feedline and creating difficulty with swr readings. For best results make sure that the shorted part of the quarterwave feed section is above the support. For a 2 meter f 146 mhz jpole antenna, the 12 wavelength radiating section section a is equal to a 0.
In this paper, a dual band jpole antenna for vhf and uhf transceiver radio communication was simulated and implemented. The polarization of an antenna refers to the orientation of. Remember, however, that the support should be grounded because the antenna acts as a lightning rod. The sketch below shows its conceptual design from that patent document.