Title page for ETD etd-7697-21043

Type of Document Master's Thesis
Author Gobien, Andrew Timothy III
Author's Email Address agobien@vt.edu
URN etd-7697-21043
Title Investigation of Low Profile Antenna Designs for Use in Hand-Held Radios
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Davis, William A.
Safaai-Jazi, Ahmad
Stutzman, Warren L. Committee Chair
  • Antennas
  • Small Antennas
  • Low Profile
  • Hand-Held
  • Inverted-F
  • Microstrip
Date of Defense 1997-08-01
Availability unrestricted
Investigation of Low Profile Antenna Designs for Use in Hand-Held Radios

Andrew T. Gobien


Antennas in hand-held radios must be compact and unobtrusive. Electrically small and low- profile antennas experience high input reactance, low input resistance, and low radiation efficiency. Further degradation of radiation efficiency occurs in hand-held radios due to size-reduced ground planes, losses within the plastic device casing, and losses due to coupling with the tissue of the user. These factors may also affect the radiation pattern of the antenna.

This discussion reports on antenna designs that are well suited for hand-held radios. The design issues are covered for electrically small antennas and the hand-held environment. A review of Microstrip Antenna (MSA) theory, and the theory of the Inverted-L Antenna (ILA), and variations on the ILA including the Inverted-F Antenna (IFA), Planar Inverted-F Antenna (PIFA), and Dual Inverted-F Antenna (DIFA) is included. Two specific antenna designs are presented: the DIFA and the Proximity-Coupled Rectangular Patch MSA. The radiation patterns and input impedance of the DIFA are calculated numerically and measured empirically. The Proximity-Coupled Rectangular Patch Microstrip Antenna is treated numerically.

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