Designing a PCB with DEX > Parts > Parametric Parts > Type Selection > Antenna

An Inverted-F Antenna (IFA) is a type of antenna used in wireless communication, especially in compact devices like smart-phones and WiFi devices. It is called an Inverted-F because the antenna diagram looks like an inverted letter 'F'.

The IFA is a variant of the monopole antenna and is designed to be compact, making it ideal for small electronic devices. An IFA can be implemented on a printed circuit board (PCB) either as a physical component or more commonly as a trace etched onto the PCB itself.

Here are some key characteristics of the IFA:

•Design: An IFA consists of three main parts: a radiating element, a feed point, and a grounding element. The radiating element is typically a short, straight line, while the grounding element is a longer, bent line that forms the 'F' shape.

•Size and Resonant Frequency: The total length of the antenna (the radiating element plus the grounding element) is usually approximately a quarter-wavelength (λ/4) at the resonant frequency.

•Ground Plane: Like a monopole antenna, an IFA requires a ground plane to function properly. This ground plane is usually formed by the PCB itself.

•Impedance Matching: The IFA is generally easier to match to 50 ohms (standard RF circuit impedance) than a monopole, which can simplify design and improve performance.

•Directionality and Polarization: The IFA is omnidirectional in the plane perpendicular to the antenna, and it typically produces vertically polarized waves.

When designing an Inverted-F PCB antenna, it's essential to consider factors like the intended frequency of operation, the size and characteristics of the PCB (which acts as the ground plane), and the placement of other components on the board. It's also crucial to test and potentially adjust the antenna after fabrication to ensure optimal performance in the real-world environment where it will be used.