PWS_PCAAD
2
ITEE UQ Lecture 4104 B6/ 1 Example 1 – input impedance of a wire dipole • Dipole Antenna Analysis •This routine computes the input impedance, broadside gain, and radiation pattern of a dipole antenna. The feed point can be placed at the center of any expansion mode. The solution uses the piecewise sinusoidal expansion (PWS) Galerkin method, with the exact sine/cosine integral expressions used for the impedance matrix elements. This method has proven to be the most accurate and efficient technique for solving thin wire antenna and scattering problems. ITEE UQ Lecture 4104 B6/ 2 Example 1 – input impedance of a wire dipole –contd. •Begin by entering the dipole length, the dipole radius, the number of PWS expansion modes, and the position of the feed generator. The generator feed point must be located at the center of a PWS expansion mode. If the dipole is center-fed, the number of expansion modes should be odd, and the mode number of the generator should be the middle mode (this mode number is automatically selected as the default mode number for the generator). The routine will then estimate the resonant frequency of the dipole, and suggest a frequency step size. These values are displayed, along with the default number (7) of frequency points, in three boxes to the right of the Compute button. Click the Compute button to accept these values for the frequency sweep, or enter new values for the center frequency, the frequency step size, or the number of frequency points •The routine will then compute the impedance matrix for the dipole, and list the input impedance versus frequency in the list box. The scroll bar can be used to scroll through the data. The gain of the dipole at its beam maximum, and the radiation efficiency, are computed at the center frequency of the frequency sweep. At this point you can plot the impedance locus versus frequency on a Smith chart plot or a VSWR/Return Loss plot, and can save the impedance data in a data file.
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Transcript of PWS_PCAAD
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ITEE UQLecture 4104 B6/ 1
Example 1 input impedance of a wire dipole
Dipole Antenna Analysis
This routine computes the input impedance, broadside gain, and radiation pattern of a dipole antenna. The feed point can be placed at the center of any expansion mode. The solution uses the piecewise sinusoidal expansion (PWS) Galerkin method, with the exact sine/cosine integral expressions used for the impedance matrix elements. This method has proven to be the most accurate and efficient technique for solving thin wire antenna and scattering problems.
ITEE UQLecture 4104 B6/ 2
Example 1 input impedance of a wire dipole contd.
Begin by entering the dipole length, the dipole radius, the number of PWS expansion modes, and the position of the feed generator. The generator feed point must be located at the center of a PWS expansion mode. If the dipole is center-fed, the number of expansion modes should be odd, and the mode number of the generator should be the middle mode (this mode number is automatically selected as the default mode number for the generator). The routine will then estimate the resonant frequency of the dipole, and suggest a frequency step size. These values are displayed, along with the default number (7) of frequency points, in three boxes to the right of the Compute button. Click the Compute button to accept these values for the frequency sweep, or enter new values for the center frequency, the frequency step size, or the number of frequency points
The routine will then compute the impedance matrix for the dipole, and list the input impedance versus frequency in the list box. The scroll bar can be used to scroll through the data. The gain of the dipole at its beam maximum, and the radiation efficiency, are computed at the center frequency of the frequency sweep. At this point you can plot the impedance locus versus frequency on a Smith chart plot or a VSWR/Return Loss plot, and can save the impedance data in a data file.
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ITEE UQLecture 4104 B6/ 3
Example 1 input impedance of a wire dipole contd.
ITEE UQLecture 4104 B6/ 4
Example 1 input impedance of a wire dipole contd.
