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How Antennas Work — Reading Comprehension

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NGSS 4-PS4-3

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This engaging 350-word science passage introduces elementary students to the fascinating world of antennas and signal transmission. Aligned with NGSS standard 4-PS4-3, the passage explains how antennas function as structures that help transmitters send signals farther and enable receivers to detect signals more effectively. Students discover why antennas come in different shapes and sizes depending on the type of waves they handle. Real-world connections include car radio antennas receiving radio signals and large cell phone tower antennas providing stronger signals for mobile devices. The content features audio integration for enhanced accessibility, bold key vocabulary terms with immediate definitions, and concrete analogies that connect scientific concepts to familiar experiences. Supporting activities include multiple-choice comprehension questions, writing prompts, and graphic organizers that reinforce understanding of antenna structure, function, and signal transmission concepts essential for fourth and fifth-grade science learning.

CONTENT PREVIEW

An antenna is a special structure made of metal that sends or receives invisible waves through the air. These waves carry information like music, voices, or data from one place to another. Antennas are important because they help our radios, televisions, cell phones, and other devices communicate over long distances without any wires connecting them.

Antennas work in two main ways. A transmitter antenna sends out signals by changing electricity into invisible waves called electromagnetic waves. These waves travel through the air at the speed of light, carrying information with them. Think of it like tossing a ball to a friend—the antenna throws the signal out into the air. On the other side, a receiver antenna catches these waves and changes them back into electricity that your device can understand. The receiver is like the friend catching the ball.

The size and shape of an antenna matters a lot. Different types of waves need different types of antennas to work well. For example, the small antenna on your car radio is designed to pick up radio waves that carry music and talk shows. Cell phone towers have very large antennas because they need to send and receive signals over many miles to reach all the phones in an area.

The strength of a signal depends on the antenna too. A bigger antenna can usually send signals farther and receive weaker signals better. That's why cell phone towers are so tall—they need their antennas high up where nothing blocks the signals. When your car drives through a tunnel, the radio might stop working because the antenna can't receive signals through all that rock and concrete.

Antennas come in many different shapes. Some look like straight rods, others look like dishes or bowls, and some are flat panels. Each shape works best for a specific type of wave. A satellite dish antenna is curved like a bowl to collect weak signals from space satellites and focus them onto a small receiver in the center.

Antennas are essential structures in our modern world. They make it possible for us to listen to music in our cars, talk on cell phones, watch television, and connect to the internet wirelessly. Without antennas sending and receiving signals all around us, our devices couldn't communicate with each other across distances.

What is an antenna made of?

PlasticMetalWoodGlass

What do transmitter antennas send out?

Electricity onlySound wavesElectromagnetic wavesLight beams

Why are cell phone towers tall?

To look niceTo save spaceTo be near cloudsTo avoid signal blocking

Why does car radio stop in tunnels?

Rock blocks the signalsThe antenna breaksThe battery diesIt gets too dark

What shape is a satellite dish antenna?

Straight rodFlat panelCurved like a bowlSquare box

How does antenna size affect signal strength?

Size doesn't matter at allBigger antennas send signals fartherSmaller antennas work better alwaysOnly shape matters, not size

Antennas can send signals without wires.

TrueFalse

What does a receiver antenna do?

Only sends signals outBlocks all wavesCatches waves and converts themMakes electricity disappear

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• Reading curriculum support
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How Antennas Work — Reading Comprehension

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