《Compact and Broadband Microstrip Antennas》[1].part4.rar

In order to meet the miniaturization requirements of portable communication equipment,
researchers have given much attention recently to compact microstrip antennas.
Many related compact designs with broadband dual-frequency operation, dualpolarized
radiation, circularly polarized radiation, and enhanced antenna gain have
been reported. Many significant advances in improving the inherent narrow operating
bandwidth of microstrip antennas have been published in the open literature since
1997. By using presently available techniques, one can easily achieve an impedance
bandwidth (1:2 voltage standingwave ratio) of larger than 25% for a probe-fed singlepatch
microstrip antenna. Other feeding methods such as the use of an aperturecoupled
feed, a capacitively coupled feed, or a three-dimensional microstrip transition
feed can yield impedance bandwidths greater than 40% with good radiation
characteristics for a single-patch microstrip antenna. In addition, various designs for
achieving broadband circularly polarized radiation, broadband dual-frequency operation,
and broadband dual-polarized radiation have been demonstrated. Taking broadband
circularly polarized radiation as an example, some recently reported designs
exhibit a 3-dB axial-ratio bandwidth greater than 40% for a single-patch microstrip
antenna.

to be continued...

In order to meet the miniaturization requirements of portable communication equipment,
researchers have given much attention recently to compact microstrip antennas.
Many related compact designs with broadband dual-frequency operation, dualpolarized
radiation, circularly polarized radiation, and enhanced antenna gain have
been reported. Many significant advances in improving the inherent narrow operating
bandwidth of microstrip antennas have been published in the open literature since
1997. By using presently available techniques, one can easily achieve an impedance
bandwidth (1:2 voltage standingwave ratio) of larger than 25% for a probe-fed singlepatch
microstrip antenna. Other feeding methods such as the use of an aperturecoupled
feed, a capacitively coupled feed, or a three-dimensional microstrip transition
feed can yield impedance bandwidths greater than 40% with good radiation
characteristics for a single-patch microstrip antenna. In addition, various designs for
achieving broadband circularly polarized radiation, broadband dual-frequency operation,
and broadband dual-polarized radiation have been demonstrated. Taking broadband
circularly polarized radiation as an example, some recently reported designs
exhibit a 3-dB axial-ratio bandwidth greater than 40% for a single-patch microstrip
antenna.

In order to meet the miniaturization requirements of portable communication equipment,
researchers have given much attention recently to compact microstrip antennas.
Many related compact designs with broadband dual-frequency operation, dualpolarized
radiation, circularly polarized radiation, and enhanced antenna gain have
been reported. Many significant advances in improving the inherent narrow operating
bandwidth of microstrip antennas have been published in the open literature since
1997. By using presently available techniques, one can easily achieve an impedance
bandwidth (1:2 voltage standingwave ratio) of larger than 25% for a probe-fed singlepatch
microstrip antenna. Other feeding methods such as the use of an aperturecoupled
feed, a capacitively coupled feed, or a three-dimensional microstrip transition
feed can yield impedance bandwidths greater than 40% with good radiation
characteristics for a single-patch microstrip antenna. In addition, various designs for
achieving broadband circularly polarized radiation, broadband dual-frequency operation,
and broadband dual-polarized radiation have been demonstrated. Taking broadband
circularly polarized radiation as an example, some recently reported designs
exhibit a 3-dB axial-ratio bandwidth greater than 40% for a single-patch microstrip
antenna.

In order to meet the miniaturization requirements of portable communication equipment,
researchers have given much attention recently to compact microstrip antennas.
Many related compact designs with broadband dual-frequency operation, dualpolarized
radiation, circularly polarized radiation, and enhanced antenna gain have
been reported. Many significant advances in improving the inherent narrow operating
bandwidth of microstrip antennas have been published in the open literature since
1997. By using presently available techniques, one can easily achieve an impedance
bandwidth (1:2 voltage standingwave ratio) of larger than 25% for a probe-fed singlepatch
microstrip antenna. Other feeding methods such as the use of an aperturecoupled
feed, a capacitively coupled feed, or a three-dimensional microstrip transition
feed can yield impedance bandwidths greater than 40% with good radiation
characteristics for a single-patch microstrip antenna. In addition, various designs for
achieving broadband circularly polarized radiation, broadband dual-frequency operation,
and broadband dual-polarized radiation have been demonstrated. Taking broadband
circularly polarized radiation as an example, some recently reported designs
exhibit a 3-dB axial-ratio bandwidth greater than 40% for a single-patch microstrip
antenna.

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