unipoleadj.n.
/ˈjuːnɪpəʊl/, U.S. /ˈjunəˌpoʊl/ A. adj.
1. Physics. = unipolar adj. 1.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > electricity > electrically induced magnetism > electromagnetic induction > [noun]
excitation1656
induction1801
magnetic induction1851
unipolar induction1856
influence1870
magneto-induction1889
unipole1892
1892 Electr. Rev. 31 751/1 This dynamo is called a ‘unipole’ dynamo, but in reality it is a four-pole dynamo.
1928 B. J. Leggett Theory & Pract. Radiol. III. iv. 235 This is done by earthing..one end of the secondary winding of the transformer... Such unipole earthing promotes high-frequency surges.
1967 Sci. Jrnl. June 48/3 There is no such thing as a unipole magnet. Every magnet has a north and south pole and is bipolar.
2000 G. Basin Art of Becoming 172 Consider a simple unipole magnet as an example of the state of unity.
2. Telecommunications. Of an antenna or aerial: that is a monopole (monopole n.3 2).
ΘΚΠ
society > communication > telecommunication > radio communications > radio equipment > [adjective] > types of aerial
rhombic1933
unipole1945
1945 Proc. I. R. E. Oct. 45A (advt.) Andrew engineers have designed a unique Folded Unipole Antenna which—according to comparative tests—easily outperforms other antennas at several times the price.
1958 Engineering 31 Jan. 157/3 It works into groundplane folded unipole aerials on top of 80 ft. masts.
1996 J. C. Whitaker Electronics Handbk. lxxxvii. 1338/2 (caption) The folded unipole antenna, which can be visualized as a ½-wave folded dipole antenna perpendicular to the ground and cut in half.
B. n.
1. Physics. A magnetic monopole; = monopole n.3 1b.
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the world > matter > physics > quantum theory > quantum mechanics > quantum electrodynamics > [noun] > single charge or pole
unipole1931
magnetic monopole1951
monopole1951
1931 S. R. Williams Magnetic Phenomena ii. 124 In trying to draw an analogy between electric charges and magnetic poles we have tried to think of an isolated magnetic pole in the same way. No matter how far one magnetic pole is from its companion pole there will be just as many lines of force running to it as away from it... It would be far better to think in terms of di-poles instead of uni-poles.
2001 J. A. Van Allen in J. A. M. Beeker et al. Cent. Space Sci. I. v. 175/1 Sin2 α/B is a rigorous constant of the motion of a charged particle in the static field of a magnetic unipole.
2008 S. Drell in S. Talbott Great Exper. Notes 445 If you split a magnet in half, you don't end up with two separated north and south unipoles.
2. Telecommunications. A monopole antenna or aerial; = monopole n.3 2.
ΘΚΠ
society > communication > telecommunication > radio communications > radio equipment > [noun] > aerial
radiator1897
aerial wire1899
aerial1902
antenna1902
loop antenna1906
loop aerial1913
twin aerial1913
frame aerial1916
loop1922
beam aerial1926
cage aerial1926
Adcock1928
dipole1929
V antenna1932
beam antenna1935
rig1935
horn1936
whip1940
whip aerial1941
whip antenna1943
polyrod1945
unipole1945
slot aerial1946
slot antenna1946
dish1948
quad1951
V aerial1961
dish aerial1962
rectenna1964
omni-antenna1966
monopole1974
1945 Wireless Engineer 22 588/1 Movements of the observer were sometimes troublesome, but their effects were lessened..in cases where a unipole was being investigated.
1961 Pop. Mech. Sept. 198/2 The antenna is a collapsible telescoping unipole, which disappears into the set when not in use.
1973 Electronics Lett. 9 300/2 The input impedance of a coaxially fed short unipole can be brought to resonance by encasing the antenna in a slab of high-permittivity dielectric material.
2005 C. A. Balanis Antenna Theory (ed. 3) ix. 506 Whenever one of the cones is mounted on an infinite plane conductor..it forms a unipole.
This entry has been updated (OED Third Edition, September 2015; most recently modified version published online March 2022).
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adj.n.1892