Use this calculator to find the dimensions of a Dipole antenna designed to operate at a specified wavelength. The wavelength is typically specified in meters or m.
As an example you might want to calculate the dimensions of a 40 meter dipole.
A half-wave dipole antenna is comprised of two quarter-wavelength conductors placed end to end [1].
This calculator gives the length of a half wave dipole antenna. Enter the Frequency and the tool will compute the antenna length (L).
Example Calculation
At a frequency of operation 1000 MHz, the dipole length (L) is 5.62 inches or 0.14 meters.
The dimensions are smaller than that of an antenna that operates at a lower frequency.
At a frequency of 100 MHz, the dipole length L is 56.4 inches or 1.4 meters.
Formula
The total length (L) of the dipole antenna is calculated as:
L = 468 / f
where f is the frequency in MHz.
f is calculated from the wavelength.
The length of each arm of the dipole
l = L/2
Table of Antenna Wavelength vs Antenna Length
The following table provides the physical antenna dimensions (length in feet) as a function of the wavelength.
Antenna Wavelength (m) | Dipole Length (L) in feet |
1 | 1.6 |
2 | 3.1 |
3 | 4.7 |
4 | 6.2 |
5 | 7.8 |
6 | 9.4 |
7 | 10.9 |
8 | 12.5 |
9 | 14.0 |
10 | 15.6 |
11 | 17.2 |
12 | 18.7 |
13 | 20.3 |
14 | 21.9 |
15 | 23.4 |
16 | 25.0 |
17 | 26.5 |
18 | 28.1 |
19 | 29.7 |
20 | 31.2 |
21 | 32.8 |
22 | 34.3 |
23 | 35.9 |
24 | 37.5 |
25 | 39.0 |
26 | 40.6 |
27 | 42.1 |
28 | 43.7 |
29 | 45.3 |
30 | 46.8 |
31 | 48.4 |
32 | 50.0 |
33 | 51.5 |
34 | 53.1 |
35 | 54.6 |
36 | 56.2 |
37 | 57.8 |
38 | 59.3 |
39 | 60.9 |
40 | 62.4 |
41 | 64.0 |
42 | 65.6 |
43 | 67.1 |
44 | 68.7 |
45 | 70.2 |
46 | 71.8 |
47 | 73.4 |
48 | 74.9 |
49 | 76.5 |
50 | 78.1 |
51 | 79.6 |
52 | 81.2 |
53 | 82.7 |
54 | 84.3 |
55 | 85.9 |
56 | 87.4 |
57 | 89.0 |
58 | 90.5 |
59 | 92.1 |
60 | 93.7 |
61 | 95.2 |
62 | 96.8 |
63 | 98.3 |
64 | 99.9 |
65 | 101.5 |
66 | 103.0 |
67 | 104.6 |
68 | 106.2 |
69 | 107.7 |
70 | 109.3 |
71 | 110.8 |
72 | 112.4 |
73 | 114.0 |
74 | 115.5 |
75 | 117.1 |
76 | 118.6 |
77 | 120.2 |
78 | 121.8 |
79 | 123.3 |
80 | 124.9 |
81 | 126.4 |
82 | 128.0 |
83 | 129.6 |
84 | 131.1 |
85 | 132.7 |
86 | 134.3 |
87 | 135.8 |
88 | 137.4 |
89 | 138.9 |
90 | 140.5 |
91 | 142.1 |
92 | 143.6 |
93 | 145.2 |
94 | 146.7 |
95 | 148.3 |
96 | 149.9 |
97 | 151.4 |
98 | 153.0 |
99 | 154.5 |
100 | 156.1 |
101 | 157.7 |
102 | 159.2 |
103 | 160.8 |
104 | 162.4 |
105 | 163.9 |
106 | 165.5 |
107 | 167.0 |
108 | 168.6 |
109 | 170.2 |
110 | 171.7 |
111 | 173.3 |
112 | 174.8 |
113 | 176.4 |
114 | 178.0 |
115 | 179.5 |
116 | 181.1 |
117 | 182.6 |
118 | 184.2 |
119 | 185.8 |
120 | 187.3 |
121 | 188.9 |
122 | 190.5 |
123 | 192.0 |
124 | 193.6 |
125 | 195.1 |
126 | 196.7 |
127 | 198.3 |
128 | 199.8 |
129 | 201.4 |
130 | 202.9 |
131 | 204.5 |
132 | 206.1 |
133 | 207.6 |
134 | 209.2 |
135 | 210.7 |
136 | 212.3 |
137 | 213.9 |
138 | 215.4 |
139 | 217.0 |
140 | 218.6 |
141 | 220.1 |
142 | 221.7 |
143 | 223.2 |
144 | 224.8 |
145 | 226.4 |
146 | 227.9 |
147 | 229.5 |
148 | 231.0 |
149 | 232.6 |
150 | 234.2 |
151 | 235.7 |
152 | 237.3 |
153 | 238.8 |
154 | 240.4 |
155 | 242.0 |
156 | 243.5 |
157 | 245.1 |
158 | 246.7 |
159 | 248.2 |
160 | 249.8 |
161 | 251.3 |
162 | 252.9 |
163 | 254.5 |
164 | 256.0 |
165 | 257.6 |
166 | 259.1 |
167 | 260.7 |
168 | 262.3 |
169 | 263.8 |
170 | 265.4 |
171 | 266.9 |
172 | 268.5 |
173 | 270.1 |
174 | 271.6 |
175 | 273.2 |
176 | 274.8 |
177 | 276.3 |
178 | 277.9 |
179 | 279.4 |
180 | 281.0 |
181 | 282.6 |
182 | 284.1 |
183 | 285.7 |
184 | 287.2 |
185 | 288.8 |
186 | 290.4 |
187 | 291.9 |
188 | 293.5 |
189 | 295.0 |
190 | 296.6 |
191 | 298.2 |
192 | 299.7 |
193 | 301.3 |
194 | 302.8 |
195 | 304.4 |
196 | 306.0 |
197 | 307.5 |
198 | 309.1 |
199 | 310.7 |
200 | 312.2 |