The unit presented here is a passive (non-powered) circuit, comprising of the following modules:

1. Energy Intake Module

The main role of the energy intake module is to collect energy from the environment. This is done using passive (non-powered) antennas.

Any antenna (or aerial) is, fundamentally, an energy converter; converting electromagnetic waves into electric signals (voltages and currents). In its simplest form, an antenna is a piece of conductive wire (copper or aluminium) in which changing ambient fields (E) induce a voltage (V) or current (I) through electromagnetic induction.

The antennas used in the magnetic DPC system are three-arm spiral antennas.

Spiral antennas are special type of antennas, characterized by compact size and very wide bandwidths. They were invented in the mid-1950s by wrapping the arms of a simple antenna around each other to form a spiral.

Wrapping the arms of a dipole around each other creates a spiral antenna

Such antennas are widely used today in the defence and communication industry for sensing applications including military aircrafts, landmine detection, GPS receivers, satellite communications networks etc.

The magnetic DPC presented here uses three-arm spiral antennas, however other types of spiral antennas can also be constructed.

2. Filtering Module

Research has shown that certain frequencies of Earth’s magnetic field are the primary driver behind rising damp. Water molecules being polar molecules (with one positive and one negative side), can be influenced and moved by various external fields.

By eliminating the critical frequencies that are responsible for the movement of water, one can reduce or cancel the occurrence of rising damp – which is the primary role of the filtering module.

The filtering of the collected signal is done by precisely tuned passive bandpass filters, and it is realized with two sets of other spiral antennas that form a complex inductive-capacitive (LC) filter. We are not going to go into further technical details of filtering mechanism – the important point is that a filtering of the collected energy occurs here, eliminating the key frequencies that are creating the rising damp.

LC filtering network

3. The Case (Resonant Cavity)

The primary role of the case is not an aesthetic one but a functional one, it plays an active role in the functioning of the device. The various “ribs” on the case amplify certain frequencies to make the unit perform better.

Measurements

The filtered signals can easily be visualized on a spectrum analyser, a special instrument used for visualizing high frequency signals, where the filtered-out frequencies show up on the screen as sharp peaks.

“Filtered out” or resonant frequencies show up as high vertical peaks on the screen.

Notice the periodic appearance of the resonant frequencies as a result of the
precisely calculated and engineered filtering network.

Here are some pictures of actual DPC systems showing some of the internals.

Internals of a magnetic DPC system

Various cases and circuit types are being constantly tested in order to improve the efficiency of the system.