Multiple frequency band and high isolation mobile device antennas using a capacitive slot

Corbett Rowell, Edmund Y. Lam

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The performance characteristics of the capacitive slot, or a slot placed between the feed and ground connections, in a planar inverted-F antenna (PIFA) are comprehensively analyzed. The PIFA capacitive slot behavior is measured inside a two antenna system within a mobile phone where the first antenna is a multiple band PIFA and the second antenna is a higher frequency band PIFA directly overlapping with the first antenna higher frequency band. The dual band PIFA in this paper is designed to be resonant in the quad-band GSM+3G/4G, and the second PIFA is resonant in the 3G/4G frequency bands. The capacitive slot has three types of behaviors: affect the matching of existing frequency resonances, induce another frequency resonance, and improve the isolation between the two antennas. Together with optimal antenna ground and feed placement, the capacitive slot can act as a notched bandstop filter to decrease the S 21 mutual coupling between the two antennas by over 20 dB and decrease the envelope correlation by almost one order of magnitude.

Original languageEnglish
Article number6204065
Pages (from-to)3576-3582
Number of pages7
JournalIEEE Transactions on Antennas and Propagation
Volume60
Issue number8
DOIs
Publication statusPublished - 2012
Externally publishedYes

Fingerprint

slots
Mobile devices
Frequency bands
isolation
antennas
Antennas
Antenna grounds
Antenna feeders
Waveguide couplers
bandstop filters
Notch filters
Global system for mobile communications
Mobile phones
envelopes

Keywords

  • Antenna efficiency
  • antenna theory
  • bandstop filters
  • inverted-F antennas
  • isolation technology
  • microstrip antennas
  • mobile antennas
  • multiple input multiple output (MIMO) systems
  • mutual coupling
  • scattering parameters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Multiple frequency band and high isolation mobile device antennas using a capacitive slot. / Rowell, Corbett; Lam, Edmund Y.

In: IEEE Transactions on Antennas and Propagation, Vol. 60, No. 8, 6204065, 2012, p. 3576-3582.

Research output: Contribution to journalArticle

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