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An electrically-small annular slot operating in the 'DC' mode

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publicationIEE Twelfth International Conference on Antennas and Propagation (ICAP 2003)
Publisher or commissioning bodyInstitution of Electrical Engineers (IEE)
Pages686 - 689
Number of pages4
ISBN (Print)0852967527
StatePublished - 31 Mar 2003
Event12th International Conference on Antennas and Propagation - Exeter, United Kingdom


Conference12th International Conference on Antennas and Propagation
CountryUnited Kingdom


This paper considers the operation of an the annular slot antenna operating in the 'DC' mode. This stripline-fed antenna includes a shorting pin between the central resonating element and ground that causes an additional resonant mode (the 'DC' mode) to be excited well below the first natural resonance of the structure (i.e. the slot being one wavelength long). Operation at this 'DC' mode's resonant frequency results in an electrically small element that radiates in the same fashion as a wire monopole above a ground plane. To illustrate the performance of this antenna, a thorough comparison against the performance of a wire monopole is given, with the following parameters being considered; input response, full 3D radiation pattern, gain, directivity and efficiency. It is shown that the radiation potential of the annular slot in the 'DC' mode is only slightly less efficient than the wire monopole, but in all other aspects the behaviour is identical.

Additional information

Name and Venue of Event: Exeter, UK Rose publication type: Conference contribution Sponsorship: The authors wish to acknowledge the financial support from the EPSRC and QinetiQ, grant no. 00301 1875.

    Research areas

  • antenna radiation patterns, directive antennas, gain measurement, loop antennas, monopole antennas, slot antennas, strip lines


12th International Conference on Antennas and Propagation

Duration30 Apr 20033 May 2003
CountryUnited Kingdom

Event: Conference


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