How do you tune up a PCB antenna?

How do you tune up a PCB antenna?

For PCB antennas and wire-whips this can be done heuristically by snipping off small increments of metal until a resonance length is found, basically the same process as tuning a slide- whistle. Chip antennas pose a harder problem because they cannot be modified. RF designers using Chip antennas need to provide locations for matching components.

How is antenna matching done with a VNA?

Shown are indirect and direct options for calibrating and connecting the VNA. Step 2: If necessary, align the calibration plane with the measurement plane by using a port extension. As shown in Fig. 2, a transmission line between the VNA calibration plane and the matching network location will impact the measured impedance.

Which is the best tool for antenna matching?

But the best tool to make the impedance measurements needed to effectively design a matching network is a vector network analyzer (VNA). Until recently, many engineers tasked with integrating an antenna into a wireless device had limited or no access to a VNA due to the historically high cost of these instruments.

What are the components of an antenna matching network?

To combat circuit losses, the impedance-matching network in most cases consists of one or more low-loss inductors and capacitors or transmission line stubs. These components are used in a network design chosen to meet the goals of matching impedances, as well as any filtering and bandwidth (or multi-band) specifications as needed.

Which is an example of an antenna tune up?

Antenna tuning is an illusive process, which combines complex mathematical theory and heuristic methods. This paper endeavors to inform Engineers how to tune, or match, antennas for s-band radios. This example matches a 2.4GHz chip antenna that could be used for ZigBee®, Wi-Fi®, or Bluetooth®Radios.

How are chip antennas related to the ground plane?

The other half is the ground plane of the PCB. Similar to a monopole, a chip antenna’s radiation pattern and tuning are directly related to the size and shape of the ground plane. Most datasheets will present the peak gain, bandwidth, return loss, radiation pattern, and other parameters for the antenna.

What kind of Technology is used in TDK chip antennas?

TDK’s ANT series ceramic chip antennas feature compact and low profile designs utilizing low temperature co-fired ceramic technology (LTCC).

How to properly implement chip antennas in RF design?

The key in using a chip antenna in RF design is to be aware of how your implementation will differ from the datasheet. It often takes an experienced antenna designer to understand the tradeoffs and how to maximize the chip antenna performance while properly placing the antenna. Contact LSR to move forward with your wireless product design project.

Where is the coaxial connector for antenna tune up?

The coaxial RF connector is placed at the other end of the transmission line near the balun. Normally the connector would be used to make conducted measurements of RF signals. However, for the antenna tune-up we can physically rotate the connector by 180° and probe the antenna.

How long does a chip antenna need to be?

Re-matching the antenna is not easy, and requires a network analyzer. However, it is crucial to performance to have the antenna matched appropriately. Proper matching can be the difference between 20 feet and 200 feet! A chip antenna is designed to have metal near it only on certain sides.