NationMaster - Encyclopedia: Effective height

2. In low-frequency applications involving loaded or nonloaded vertical antennas, the moment of the current distribution in the vertical section divided by the input current.

Note: For an antenna with symmetrical current distribution, the center of radiation is the center of distribution. For an antenna with asymmetrical current distribution, the center of radiation is the center of current moments when viewed from points near the direction of maximum radiation.

Source: from Federal Standard 1037C and from MIL-STD-188

Categories: Antenna terminology

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Polarized battery terminal contact device - Patent 5194340 (3240 words)
	The following are relationships between the outer diameter.phi.a of the positive terminal 13 of the battery 11 and the inner diameter.phi.c of the raised annular electrode 18, the inner diameter.phi.b of the negative terminal 12 of the battery 11 and the outer diameter.phi.d of the raised annular electrode 18, the depth i (FIG.
	The effective height j of the raised electrode 18' and the difference y between the effective height of the raised electrode 18' and the height of the malconnection prevention projection 21 are identical to those in the first embodiment.
	Furthermore, the effective height j of the raised electrode 25 is identical to that of the first embodiment, so that the negative contact 24 of the battery receptacle in the fourth embodiment operates and achieves technical effects similar to the first, second and third embodiments.

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