Antenna module, communication module, and communication device

An antenna module comprising:

• a dielectric substrate having a multilayer structure;
• a first radiation electrode in a first layer of the dielectric substrate, the first radiation electrode being configured to radiate a radio-frequency signal;
• a ground electrode in a second layer of the dielectric substrate;
• and
• at least one current-interrupting circuit element that is electrically connected to the ground electrode and that is configured to interrupt a current flowing through the ground electrode, wherein:
• the at least one current-interrupting circuit element comprises a planar electrode that is parallel to the ground electrode and that has a first edge that is electrically connected to the ground electrode and a second edge that is electrically open, and
• a dimension of the at least one current-interrupting circuit element in a direction from the first edge to the second edge is λ/4, where λ is a wavelength of the radio-frequency signal radiated from the first radiation electrode.