1. Antenas para bajas frecuencias (ondas largas y medianas)

En general, los receptores de ondas medias presentan sensibilidad para la captación de las estaciones locales sin la necesidad de antenas externas, ya que las emisiones de esta banda se destinan a áreas restringidas.

En los casos en que las estaciones sean débiles, y que su captación deba ser hecha en distancias mayores, superiores a 50 km, será conveniente usar una antena externa. El tipo de antena dependerá de la sensibilidad del receptor.

En algunos casos un simple hilo estirado aislado de 4 a 10 metros de longitud sirve como antena mientras que en los casos en que se necesita mayor sensibilidad, una antena externa debe ser instalada.

En la figura 1 damos una sugerencia de antena externa cuya longitud puede quedar entre 5 y 40 metros, ideal para recepción de ondas medias en zonas rurales, alejadas de las estaciones a más de 50 km. Durante la noche, se pueden captar las estaciones muy distantes.


 

 

 

 

2. Antenas para Ondas cortas

Para la recepción de ondas cortas es siempre conveniente utilizar una buena antena externa, aunque las antenas telescópicas pueden ayudar en la recepción de las estaciones más potentes.

Si la antena está dimensionada para la pista que deseamos recibir o transmitir, será mucho mejor. Como la banda de onda corta que va de 1,6 MHz a 30 MHz corresponde a una variación muy grande de longitudes de onda, es muy difícil obtener una única antena externa que posibilite recibir bien todas las estaciones.

Para el caso de la recepción doméstica, si el lector posee una radio común para esa pista y vive lejos de los grandes centros (zona rural), tenemos en la figura 2 una antena simple.


 

 

 

 

 

3. Antenas de TV y FM

Las frecuencias más altas de las señales de TV y FM (VHF) requieren el uso de antenas apropiadas, cuyos elementos son varillas que poseen longitudes y separación en relación directa con las longitudes de onda que deben ser recibidas. Así, las antenas de TV y FM se caracterizan por usar varillas de longitudes mucho menores que los hilos usados en las antenas de radio, de ondas medias y ondas cortas.

Una antena simple de TV y FM en la que dos pedazos de hilos extendidos forman un dipolo, es indicada para la recepción locales de TV y FM, siendo mostrada en la figura 3.


 

 

 

 

Para señales débiles, en regiones alejadas o con problemas de recepción, se deben utilizar antenas de varios elementos, que deben ser cuidadosamente instaladas con vistas a la dirección de donde vienen las señales y también la existencia de obstáculos. Para recepción en distancias muy grandes, deben instalarse en mástiles elevados.

 

4. Antenas Para Microondas

Las longitudes de onda del orden de centímetros o milímetros de las microondas requieren el empleo de antenas con elementos muy pequeños. Encontramos esas antenas en enlaces de computadoras, radares y otras aplicaciones.

Normalmente se utilizan guías de onda que no son más que "canalizaciones" que permiten dirigir las ondas a un elemento sensible o la antena propiamente dicha, o del elemento que irradia (antena) al ambiente externo. En la figura 4 tenemos ejemplos de antenas de microondas.


 

 

 

 

5. Antenas Parabólicas

Las llamadas antenas parabólicas no son más que antenas de microondas. A diferencia del yo muchos piensan, la parábola de metal u otro material conductor no es la antena, sino un reflector que dirige las ondas captadas, concentrándolas en la antena propiamente dicha, como muestra la figura 5.


 

 

 

 

Así, esa antena recibe el nombre por poseer un reflector parabólico para la concentración o dirección de las señales cuando se utiliza en un transmisor.

 

Verbetes Asociados

• Antena receptora (6)

• Antena transmisora (5)

• Antena telescópica (7)

• Antena de FM y TV (14)

• Eficiencia de una antena (8)

• Ganancia de una antena (10)

• Impedancia de una antena (9)

• Longitud de onda (13)

 

Ver también

• Longitud de onda (13)

• Polarización de una antena (12)

• Tipos de antenas (15)

• Dipolo (36)

• Parabólica (37)

• Yagi (38)

• Espectro (35)

 

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