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Update short_antenna.html

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miguel 2023-03-21 22:38:23 +11:00
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short_antenna.html
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@ -7,7 +7,7 @@
<link rel="stylesheet" href="inductor.css">
</head>
<body>
<header>Miguel <a href="mailto:vk3cpu@gmail.com">VK3CPU</a> - Loaded Dipole Antenna Calculator<br></header>
<header><a href="mailto:vk3cpu@gmail.com">VK3CPU</a> - Loaded Dipole Antenna Calculator<br></header>
<section class="gridLayoutClass">
<div id="inductor-container" class="inductor-container" style="position: relative;">
<canvas id="inductor2D" class="inductorClass" width="350" height="350">
@ -23,8 +23,8 @@
<input type="range" id="antenna_length_slider" min="0.1" max="1.0" value="1.0" step="0.005">
</div>
<div class="sliders">
<label for="inductor_distance">d:</label>
<input type="range" id="inductor_distance" min="10" max="80" value="50" step="0.5">
<label for="inductor_distance_slider">d:</label>
<input type="range" id="inductor_distance_slider" min="10" max="80" value="50" step="0.5">
</div>
<div class="sliders">
<label for="conductor_diameter_slider">AWG:</label>
@ -34,15 +34,14 @@
<div id="notes" class="notes">
<br>
<b><u>Notes:</u></b><br>
RF Inductor Calculator was developed to help users predict the RF characteristics of a single-layer solenoid-style air-core inductor. <br><br>
This loaded dipole antenna calculator was developed to quickly estimate the inductance required for a coil-loaded dipole antenna, using
slider widgets. <br><br>
<u>Inputs via the slider widgets:</u>
<ul>
<li>&#8960;a : Conductor diameter slider changes AWG from 0-40. Actual diameter displayed in decimal inches.</li>
<li>&#8960;b : Coil diameter in decimal inches.</li>
<li>c/a : 'c' is the winding-to-winding distance, measured from the conductor mid-points. The 'a' is the conductor diameter, so 'c/a' is the spacing ratio. (c/a >= 1.1)
A low-value will increase the resistance due to the proximity effect.</li>
<li>N : Number of turns or windings.</li>
<li>f : The frequency of interest (MHz) for some of the calculations. Frequency dependent results are shown on the top-right.</li>
<li>f : The frequency of operation in MHz.</li>
<li>l : Length in percent compared to a half-wave dipole.</li>
<li>d : Distance of the coil/inductor from the feedpoint to the end, in percent.</li>
<li>AWG : Conductor diameter slider changes AWG from 0-40. Actual diameter displayed in decimal inches and millimeters.</li>
</ul>
<p>Characteristics on the left are independent of frequency, while the characteristics on the right are dependent on the selected frequency. <br><br>
Each of the graphic representations attempt to keep the relative geometry correct, without exceeding the drawing boundary. The coil diameter
@ -62,15 +61,6 @@
<li>SRF : Self-resonant frequency (MHz) for the unloaded coil. </li>
<li>wire : Length of wire required to wind the inductor. </li>
</ul>
<ul> <b>Frequency dependent:[R]</b> (Text goes <font color="red">RED</font> when selected frequency > SRF. Inductor model is not accurate once SRF is exceeded.)
<li>f : Selected frequency in MHz</li>
<li>&#948; : Skin depth due to skin effect (&#956;m)</li>
<li>Rac : AC resistance is calculated using the skin effect and proximity resistance from empirical data collected by Medhurst using the spacing ratio, and length-to-diameter ratio.</li>
<li>X&#8343; : Inductive reactance at the given frequency. (&#937;) - pure inductive component, ignoring parasitic capacitance </li>
<li>Z : Complex impedance at the given frequency. (&#937;) - includes losses due to series Rac and parallel parasitic C</li>
<li>|Z| : Impedance magnitude at the given frequency. (&#937;)</li>
<li>Q : Effective Quality Factor of the inductor at the given frequency. - (|Z.im|/Z.re)</li>
</ul>
</div>
</section>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjs/7.5.1/math.min.js"></script>
@ -133,16 +123,7 @@
frequency_hz : 0.0,
L : 0.0,
C : 0.0,
Rdc : 0.0,
SRF : 0.0,
Xl : 0.0,
Xc : 0.0,
Z : 0.0,
skin_depth : 0.0,
Rac : 0.0,
Q : 0.0
};
// Solve all the parameters, and re-draw the canvas:
@ -154,18 +135,21 @@
dipole.length_feet = dipole.length_meters * 3.28084;
dipole.cond_diameter_meters = 0.001 * awgToMm(40.0 - conductor_diameter_slider.value);
dipole.cond_diameter_inches = dipole.cond_diameter_meters * 39.37008;
dipole.spacing_ratio = 0.01 * inductor_distance.value;
dipole.distance_meters = inductor_distance.value * 0.005 * dipole.length_meters;
dipole.spacing_ratio = 0.01 * inductor_distance_slider.value;
dipole.distance_meters = inductor_distance_slider.value * 0.005 * dipole.length_meters;
dipole.distance_feet = dipole.distance_meters * 3.28084;
// Frequency independent characteristics:
dipole.L = 0.0;
// Redraw the canvas:
//drawDesign();
dipole.Xl = getInductanceFromDimensions(dipole.frequency_hz * 1e-6,
dipole.length_feet,
dipole.distance_feet,
dipole.cond_diameter_inches);
dipole.L = dipole.Xl / (2 * Math.PI * dipole.frequency_hz * 0.000001);
}
// Specify fonts for changing parameters controlled by the sliders:
var normal_font = "12px arial";
var normal_font = "14px arial";
//var normal_font = "14px courier";
var emphasis_font = "bold 14px arial";
const emphasis_delay = 1200;
@ -218,7 +202,7 @@
var spacing_timer_handler = 0;
var spacing_font = normal_font;
inductor_distance.oninput = function() {
inductor_distance_slider.oninput = function() {
recalculate();
if(spacing_timer_handler == 0) {
spacing_font = emphasis_font;
@ -297,15 +281,8 @@
function drawInductor(ctx, x, y, angle) {
const l1 = 12.0;
ctx.clearRect(x-l1,y-l1,2*l1,2*l1);
/*
ctx.beginPath();
ctx.moveTo(x + l1*Math.cos(angle-0.25*Math.PI), y + l1*Math.sin(angle-0.25*Math.PI));
ctx.lineTo(x + l1*Math.cos(angle+0.25*Math.PI), y + l1*Math.sin(angle+0.25*Math.PI));
ctx.lineTo(x + l1*Math.cos(angle+0.75*Math.PI), y + l1*Math.sin(angle+0.75*Math.PI));
ctx.lineTo(x + l1*Math.cos(angle+1.25*Math.PI), y + l1*Math.sin(angle+1.25*Math.PI));
ctx.lineTo(x + l1*Math.cos(angle-0.25*Math.PI), y + l1*Math.sin(angle-0.25*Math.PI));
ctx.stroke();
*/
// Draw box outline:
ctx.beginPath();
ctx.moveTo(x + l1, y - l1);
ctx.lineTo(x + l1, y + l1);
@ -314,6 +291,7 @@
ctx.lineTo(x + l1, y - l1);
ctx.stroke();
// Draw the inductor wires:
const last_width = ctx.lineWidth;
ctx.lineWidth = 4;
const last_cap = ctx.lineCap;
@ -328,18 +306,6 @@
ctx.stroke();
ctx.lineWidth = last_width;
ctx.lineCap = last_cap;
/*
ctx.beginPath();
ctx.moveTo(x , y - l1);
ctx.arcTo(x + l1, y - l1, x + l1, y - 0.33 * l1, 0.5*l1);
ctx.arcTo(x + l1, y + 0.33 * l1, x, y + 0.33 * l1, 0.5*l1);
ctx.arcTo(x - l1, y + 0.33 * l1, x - l1, y, 0.25*l1);
ctx.arcTo(x - l1, y - 0.33 * l1, x , y - 0.33 * l1, 0.25*l1);
ctx.arcTo(x + l1, y - 0.33 * l1, x + l1, y + 0.33 * l1, 0.5*l1);
ctx.arcTo(x + l1, y + l1, x, y + l1, 0.5*l1);
ctx.lineTo(x, y + l1);
ctx.stroke();
*/
}
function drawArrow(ctx, x, y, angle) {
@ -370,29 +336,17 @@
const cond_diameter_mm = dipole.cond_diameter_meters * 1000.0;
const cond_diameter_inches = cond_diameter_mm / 25.4;
fctx.font = "bold 14px arial";
fctx.textAlign = "center";
fctx.fillText("Wire : " + (40-conductor_diameter_slider.value).toString() + "AWG : " +
"\u2300 = " + cond_diameter_inches.toFixed(4).toString() + "\" " +
"(" + cond_diameter_mm.toFixed(3).toString() + " mm)", loopx, 16);
fctx.font = normal_font;
const wire_x = win_width * 0.50;
const up_wire_top_y = 40;
const up_wire_top_y = 20;
const up_wire_bot_y = win_height * 0.5 - 5;
const down_wire_top_y = win_height * 0.5 + 5;
const down_wire_bot_y = win_height - 40;
const down_wire_bot_y = win_height - 20;
var arrow_size = 10.0;
const Xl = getInductanceFromDimensions(dipole.frequency_hz * 1e-6,
dipole.length_feet,
dipole.distance_feet,
dipole.cond_diameter_inches);
//console.log(Xl);
// Draw the top antenna element:
fctx.beginPath();
fctx.moveTo(wire_x, up_wire_top_y);
@ -420,18 +374,22 @@
//fctx.fillText("0.00 ft", wire_x + 60, down_wire_bot_y );
fctx.fillText("0.00", wire_x + 60, down_wire_bot_y + 5);
//drawArrow(fctx, wire_x + 10, up_wire_bot_y, -0.5*Math.PI);
const L = Xl / (2 * Math.PI * dipole.frequency_hz * 0.000001);
fctx.font = emphasis_font;
fctx.fillText("L = " + L.toFixed(1).toString() + " \u00B5H", wire_x + 20, d_pos - 4);
fctx.fillText("L = " + dipole.L.toFixed(1).toString() + " \u00B5H", wire_x + 30, d_pos - 4);
fctx.font = normal_font;
fctx.fillText("X = " + Xl.toFixed(1).toString() + " \u03A9", wire_x + 20, d_pos + 12);
fctx.fillText("X = " + dipole.Xl.toFixed(1).toString() + " \u03A9", wire_x + 30, d_pos + 12);
fctx.font = frequency_font;
fctx.fillText("f = " + (dipole.frequency_hz * 1e-6).toFixed(2).toString() + " MHz", 20, down_wire_bot_y - 36);
const left_spacing = 15;
fctx.fillText("f = " + (dipole.frequency_hz * 1e-6).toFixed(2).toString() + " MHz", left_spacing, down_wire_bot_y - 72);
fctx.font = loop_dia_font;
fctx.fillText("l = " + (antenna_length_slider.value * 1e2).toFixed(1).toString() + " %", 20, down_wire_bot_y - 18);
fctx.fillText("l = " + (antenna_length_slider.value * 1e2).toFixed(1).toString() + " %", left_spacing, down_wire_bot_y - 54);
fctx.font = spacing_font;
fctx.fillText("d = " + (dipole.spacing_ratio * 1e2).toFixed(1).toString() + " %", 20, down_wire_bot_y );
fctx.fillText("d = " + (dipole.spacing_ratio * 1e2).toFixed(1).toString() + " %", left_spacing, down_wire_bot_y - 36);
fctx.font = cond_dia_font;
fctx.fillText("AWG = " + (40-conductor_diameter_slider.value).toString(), left_spacing, down_wire_bot_y - 18);
fctx.fillText("\u2300 = " + cond_diameter_inches.toFixed(4).toString() + "\" " +
"(" + cond_diameter_mm.toFixed(3).toString() + " mm)", left_spacing, down_wire_bot_y);
//fctx.textAlign = "center";
//fctx.fillText("f = " + (dipole.frequency_hz * 1e-6).toFixed(2).toString() + " MHz", wire_x, down_wire_bot_y + 30);