Abstract:
General expressions are obtained for the lower bounds on the quality factor (Q) of electrically small electric- and magnetic-dipole antennas confined to an arbitrarily ...Show MoreMetadata
Abstract:
General expressions are obtained for the lower bounds on the quality factor (Q) of electrically small electric- and magnetic-dipole antennas confined to an arbitrarily shaped volume V and excited by general sources or by global electric-current sources alone. The lower-bound expressions depend only on the direction of the dipole moment with respect to V , the electrical size of V , and the static electric and magnetic polarizabilities per unit volume of hypothetical perfectly electrically conducting and perfectly magnetically conducting volumes V . The lower bounds are obtained directly from the electromagnetic field expressions for Q with the help of current equivalence principles and the uncoupling of Maxwell's equations for electrically small volumes into quasi-electrostatic and quasi-magnetostatic fields.
Published in: IEEE Transactions on Antennas and Propagation ( Volume: 58, Issue: 10, October 2010)
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- IEEE Keywords
- Index Terms
- Lower Bound ,
- Dipole Antenna ,
- Electromagnetic Field ,
- Polarizability ,
- Quality Factor ,
- General Expression ,
- Maxwell’s Equations ,
- Electric Polarization ,
- Magnetic Poles ,
- Free Space ,
- Far-field ,
- Magnetic Moment ,
- Electric Current ,
- Surface Current ,
- Uniform Field ,
- Global Surface ,
- Incident Field ,
- Electric Dipole Moment ,
- Original Field ,
- Spherical Volume ,
- Uniform Electric Field ,
- Incident Electric Field ,
- Lossy Medium ,
- Non-uniform Electric Field ,
- Equivalent Current ,
- Equivalent Surface ,
- Sum Rules ,
- Magnetic Charge ,
- Bandwidth Of The Antenna ,
- Principal Directions
- Author Keywords
Keywords assist with retrieval of results and provide a means to discovering other relevant content. Learn more.
- IEEE Keywords
- Index Terms
- Lower Bound ,
- Dipole Antenna ,
- Electromagnetic Field ,
- Polarizability ,
- Quality Factor ,
- General Expression ,
- Maxwell’s Equations ,
- Electric Polarization ,
- Magnetic Poles ,
- Free Space ,
- Far-field ,
- Magnetic Moment ,
- Electric Current ,
- Surface Current ,
- Uniform Field ,
- Global Surface ,
- Incident Field ,
- Electric Dipole Moment ,
- Original Field ,
- Spherical Volume ,
- Uniform Electric Field ,
- Incident Electric Field ,
- Lossy Medium ,
- Non-uniform Electric Field ,
- Equivalent Current ,
- Equivalent Surface ,
- Sum Rules ,
- Magnetic Charge ,
- Bandwidth Of The Antenna ,
- Principal Directions
- Author Keywords