A dual capacitively fed broadband patch antenna with reduced cross-polarization radiation

Measuring the Impedance and Efficiency of Differentially Driven Microstrip Antenna by Two Balun Methods

“…There are ten unknowns in the vector column. To find them, one has to conduct four measurements of four different two-port standards through the balun, resulting in a system of 12 equations given in (8). The system of twelve equations is overdetermined and has a sparse coefficient matrix with the maximum rank of 9.…”

Measuring the Impedance and Efficiency of Differentially Driven Microstrip Antenna by Two Balun Methods

“…There are ten unknowns in the vector column. To find them, one has to conduct four measurements of four different two-port standards through the balun, resulting in a system of 12 equations given in (8). The system of twelve equations is overdetermined and has a sparse coefficient matrix with the maximum rank of 9.…”

Dual-feed hybrid antenna with low isolation and cross polarization

“…If a direct probe-fed method is used, polarization impurity will be enhanced due to the distorted current distribution surrounding the feed-point [2]. Hence, a meandering probe feed method [3] is proposed to suppress the probe radiation, and the undesirable higher-order modes and distorted current distributions (or XP) can be effectively suppressed by employing a dual-feed system with equal amplitude and 180 0 phase shift [4], [5]. Other method such as the use of aperture coupled feed for dualpolarization is also recommended [4], [6] to avoid polarization impurity induced by the feeding probe.…”

Broadband Aperture-Coupled Microstrip Antennas With Low Cross Polarization and Back Radiation

“…Recently, several technologies for suppressing the radiation sources of the XP have been proposed [7][8][9][10][11][12][13][14]. From the obtained results, it is found that the probe radiation can be considerably reduced by a meandering probe [8][9][10], and the unwanted higher-order modes and distorted current distributions can be effectively suppressed by employing a dual-feed system with a 180 • phase shift [11][12][13]. In addition, a balance-like feeding mechanism described in [14], which is single-feed, has the similar characteristics to the dual-feed system, but it does not need any phase-delay circuit.…”

Measuring the Impedance and Efficiency of Differentially Driven Microstrip Antenna by Two Balun Methods

“…There are ten unknowns in the vector column. To find them, one has to conduct four measurements of four different two-port standards through the balun, resulting in a system of 12 equations given in (8). The system of twelve equations is overdetermined and has a sparse coefficient matrix with the maximum rank of 9.…”

Dual-feed hybrid antenna with low isolation and cross polarization

“…If a direct probe-fed method is used, polarization impurity will be enhanced due to the distorted current distribution surrounding the feed-point [2]. Hence, a meandering probe feed method [3] is proposed to suppress the probe radiation, and the undesirable higher-order modes and distorted current distributions (or XP) can be effectively suppressed by employing a dual-feed system with equal amplitude and 180 0 phase shift [4], [5]. Other method such as the use of aperture coupled feed for dualpolarization is also recommended [4], [6] to avoid polarization impurity induced by the feeding probe.…”

Broadband Aperture-Coupled Microstrip Antennas With Low Cross Polarization and Back Radiation

“…Recently, several technologies for suppressing the radiation sources of the XP have been proposed [7][8][9][10][11][12][13][14]. From the obtained results, it is found that the probe radiation can be considerably reduced by a meandering probe [8][9][10], and the unwanted higher-order modes and distorted current distributions can be effectively suppressed by employing a dual-feed system with a 180 • phase shift [11][12][13]. In addition, a balance-like feeding mechanism described in [14], which is single-feed, has the similar characteristics to the dual-feed system, but it does not need any phase-delay circuit.…”

Measuring the Impedance and Efficiency of Differentially Driven Microstrip Antenna by Two Balun Methods

“…There are ten unknowns in the vector column. To find them, one has to conduct four measurements of four different two-port standards through the balun, resulting in a system of 12 equations given in (8). The system of twelve equations is overdetermined and has a sparse coefficient matrix with the maximum rank of 9.…”

Dual-feed hybrid antenna with low isolation and cross polarization

“…If a direct probe-fed method is used, polarization impurity will be enhanced due to the distorted current distribution surrounding the feed-point [2]. Hence, a meandering probe feed method [3] is proposed to suppress the probe radiation, and the undesirable higher-order modes and distorted current distributions (or XP) can be effectively suppressed by employing a dual-feed system with equal amplitude and 180 0 phase shift [4], [5]. Other method such as the use of aperture coupled feed for dualpolarization is also recommended [4], [6] to avoid polarization impurity induced by the feeding probe.…”

Broadband Aperture-Coupled Microstrip Antennas With Low Cross Polarization and Back Radiation

“…Recently, several technologies for suppressing the radiation sources of the XP have been proposed [7][8][9][10][11][12][13][14]. From the obtained results, it is found that the probe radiation can be considerably reduced by a meandering probe [8][9][10], and the unwanted higher-order modes and distorted current distributions can be effectively suppressed by employing a dual-feed system with a 180 • phase shift [11][12][13]. In addition, a balance-like feeding mechanism described in [14], which is single-feed, has the similar characteristics to the dual-feed system, but it does not need any phase-delay circuit.…”