Search and replace Search and replace the wire dimension, radius, and SEG. The search always is done over the wire. This is useful for replace something all. When Also relace mirrow's coordinates is checked, plus and minus values are compared in their absolute value. For example, replacing 3 with 4 also replaces -3 with -4. Replace start and end points Exchange the X- and Y-axis values, the Y- and Z-axis values, or the Y- and Z-axis values. This is useful for checking the antenna placing vertically and horizontally. Wire scale Enlarge or reduce the size of the antenna. This is useful for porting a design to the other band and the fine tuning. If you also change the wire radius, the antennas are compatible for any frequencies (except for the antenna with a lumped-constant load). A normal approach to optimize the antenna that
is a little off the target frequency is to minimize jX, but it takes
substantial time. In addition, it is not guaranteed that you
have the satisfying result. Round value Round off all the parameters including wire coordinates, radius, and lumped-constant load. After you have done the resize or optimization of the antenna, you will have many fractions. Use this function to get them to the practical precision. Make stack You can easily extend an antenna to stack by command Make Stack. Follow the dialog box to make vertical/horizontal stack antennas. The design of the original antenna is unchanged, so you can easily make up various formation. To make your stacked design permanent, push the Make new description as new antenna button in the Stack window. If you have done this once, you no longer get it back to the original design, that is, a single antenna. This is used to implement a phased driven or a unbalanced driven antenna. In either case, the number of antennas N is given by [number of horizontal] multiplied by [number of vertical]. This means that: Wire definition MMANA-GAL uses the orthogonal X-Y-Z coordinates to define and calculate antennas. However, it occasionally is easy for the designer to use the polar coordinates (i.e., length, azimuth, and zenith) for the wire definition. This menu provides the editor in the polar coordinates. Move You can move the selected wire to any direction in parallel with X-, Y-, or Z-axis. This is useful for moving the feeding wire of hentenna. Antenna definition edit A simple text editor for the antenna design. Right click brings up a pop-up menu for cut&paste. You can use Windows' standard shortcut keys, such as Ctrl-C, Ctrl-X, and Ctrl-V. Taper wire set This menu facilitates the definition of
the wire that is composed of two or more sub-wires having different
radiuses. Uda-Yagi antennas for HF commonly compose an element with
two or more pipes in different radiuses. You can define the combination
with one shot using the predefined parameters. First, put a minus value
to the R (radius) of the pipe. Next, define the following parameters. L4 L3 L2 L1 L0 L1 L2 L3 L4 -----+-----+-----+-----+------+-----+------+-----+------ R4 R3 R2 R1 R0 R1 R2 R3 R4 [Type -> or -> *] L0 L1 L2 L3 L4 ------+-----+------+-----+------ R0 R1 R2 R3 R4 You can use "<>" or "<> *" for Uda-Yagi antennas, and "->" or
"-> *" for vertical antennas.
For instance, when you compose three pipes: 2.2m 1.8m 2m 1.8m 2.2m ------+-----+------+-----+------- 20mm 25mm 30mm 25mm 20mm [Type -> or -> *] 2m 1.8m 6.2m --------+-----+-------------------- 30mm 25mm 20mm In the antenna view window, you can observe
how the element is composed of the pipes. The connecting points are
marked with a blue square. Right click on the element to verify the
combination. You should pay attention to the segmentation for the combination
of pipes. Even if you specify the equal segmentation, the actual segmentation
will not follow it because of the element decomposition. You have to
adjust the DM2 value using the antenna view (increase it to 50 or 60). |