science

Patch antenna

Patch antenna is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Patch antenna rather than just read about it. In short: A patch antenna is a type of antenna with a low profile, usually consisting of a printed circuit board. It consists of a planar rectangular or circular sheet or "patch" of metal, mounted over a larger sheet of metal called a ground plane.

Key takeaways

Patch antenna belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Patch antenna to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Patch antenna from memory before moving on to harder problems.

Reference excerpt

A patch antenna is a type of antenna with a low profile, usually consisting of a printed circuit board. It consists of a planar rectangular or circular sheet or "patch" of metal, mounted over a larger sheet of metal called a ground plane. It is the original type of microstrip antenna described by Howell in 1972. The two metal sheets together form a resonant piece of microstrip transmission line with a length of approximately one-half wavelength of the radio waves. The radiation mechanism arises from fringing fields along the radiating edges. The radiation at the edges causes the antenna to act slightly larger electrically than its physical dimensions, so in order for the antenna to be resonant, a length of microstrip transmission line slightly shorter than one-half the wavelength at the frequency is used. The patch antenna is mainly practical at microwave frequencies, at which wavelengths are short enough that the patches are conveniently small. It is widely used in portable wireless devices because of the ease of fabricating it on printed circuit boards. Multiple patch antennas on the same substrate (see image) called microstrip antennas, can be used to make high gain array antennas, and phased arrays in which the beam can be electronically steered. A variant of the patch antenna commonly used in mobile phones is the shorted patch antenna, or planar inverted-F antenna (PIFA). In this antenna, one corner of the patch (or sometimes one edge) connected to ground via a pin. This variant has better matching than the standard patch.

See also Microwave Radiometer (Juno) (Space probe instrument, uses patch array antennas)

References

External links Patch Antenna Tutorial EM Talk The basics of patch antennas A Dual-Band Rectangular CPW Folded Slot Antenna for GNSS Applications

Illustrations

Worked examples

Example 1 — a first encounter with Patch antenna

Start with the simplest possible case. Write down what Patch antenna claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Patch antenna before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Patch antenna ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Patch antenna

In research: Patch antenna appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Patch antenna in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Patch antenna is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antennas (radio), Microwave technology, Radio frequency antenna types, so understanding it makes those chapters shorter.
In everyday life: Look for Patch antenna outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Patch antenna in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Patch antenna means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Patch antenna out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Patch antenna in simple terms?

Why does Patch antenna matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Patch antenna?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Patch antenna.