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A patch antenna is a low-profile directional radio antenna that is used for indoor locations covering single-floor offices, stores and small studios. It is mounted on a small, rectangular, flat surface and consists of two metallic plates placed upon each other. One plate is larger than the other, which is called ground plane and has a dielectric layer in the middle.
A patch antenna is also known as a panel, flat panel or microstrip antenna.
A patch antenna has a curved path of coverage; hanging on a wall, it can spread to a width of 30 to 180 degrees. This type of antenna is usually lightweight and can be easily hung on walls, encased in white or black plastic to make it inconspicuous to the observer. Moreover, the plastic casing protects the assembly from damage and also makes it easy to mount. A patch antenna is easy to make and can be customized and modified without much of an effort. It is commonly manufactured using the same materials and process for constructing printed circuit boards on a dielectric material.