This technical note is also available in PDF Format: 2500AT43A0100 Frequency Tuning (309k)

Abstract

• Experiment 1:

  To shift up /down the center frequency of 2500AT43A0100 by changing the land pattern with no matching circuits (Fo @ 2.65GHz)

• Experiment 2:

  To tune down the center frequency (to 2.5GHz) of 2500AT43A0100 soldered on the initial land pattern by matching circuits.

Experiment 1: Land Pattern Comparison

Experiment 1: Measured Result

Experiment 2: Land Pattern Image

Experiment 2: Return Loss & Matching Circuits

Experiment 2: Radiation Pattern @ 2.5GHz

Summary

• Experiment 1:

  The results show that the center frequency can be shifted up/down by about 50MHz by changing the antenna land pattern.

• Experiment 2:

  The center frequency can also be shifted down to 2.5GHz by the matching circuit (shown as the page 5).

Note: Combining experiments 1 & 2 can give the designer the desired Fo