1. A mechanical scanning feed, comprising:
a waveguide including a movable wall assembly, the movable wall assembly having at least one guide slot;
an end wall located on the moveable wall assembly and positioned proximate to the guide slot; and,
a drive assembly manipulating the position of the movable wall assembly along the waveguide in a direction parallel to the propagation path of the energy,
wherein the motion by the drive assembly changes an elevation angle of a portion of the energy propagating exiting through the guide slot.
2. The mechanical scanning feed of claim 1, wherein said end wall is positioned one-quarter of a wavelength from the guide slot.
3. The mechanical scanning feed of claim 1, further comprising a rotary joint adjacent to a delivery point to the waveguide of the propagating energy allowing for azimuth rotation of the waveguide.
4. The mechanical scanning feed of claim 3, further comprising at least one choke joint located adjacent to the rotary joint to prevent leakage of the energy propagating.
5. The mechanical scanning feed of claim 1, further comprising at least one end wall choke joint positioned proximate to the end wall to prevent energy from passing the end wall.
6. The mechanical scanning feed of claim 1, wherein the guide slot is oriented perpendicular to the movement of the movable wall assembly.
7. The mechanical scanning feed of claim 1, wherein the drive assembly comprises a plurality of motors.
8. The mechanical scanning feed of claim 7, further comprising at least two movable wall portion choke joints placed to prevent leakage of the propagating energy.
9. The mechanical scanning feed, of claim 1, wherein the moveable wall assembly comprises a single moveable wall portion.
10. The mechanical scanning feed of claim 9, wherein the single moveable wall portion comprises a plurality of guide slots, each having a width dimension and a length dimension.
11. The mechanical scanning feed of claim 10, wherein each of the plurality of guide slots has the same length dimension and the same width dimension.
12. The mechanical scanning feed of claim 10, wherein each of the plurality of guide slots has a different width dimension.
13. The mechanical scanning feed of claim 1, wherein said movable wall assembly comprises:
a first moveable wall portion having a single guide slot having a width dimension; and
a second moveable wall portion proximate to the first moveable wall portion, having a plurality of guide slots,
wherein each guide slot in the second moveable wall portion has a width that is less than the width of the guide slot in the first moveable wall portion, and
wherein the second movable wall portion and the first movable wall portion move independently to align at least one of the plurality of guide slots of the second moveable wall portion with the guide slot of the first moveable wall portion to vary a beam shape of the exiting propagating energy.
14. The mechanical scanning feed of claim 13, wherein each of the plurality of guide slots in the second moveable wall portion has a different width dimension.
15. An antenna system, comprising:
a lens;
a radio frequency source; and
a feed assembly, comprising:
a waveguide including a movable wall assembly, the movable wall assembly having a guide slot;
an end wall located on the moveable wall assembly and positioned proximate to the guide slot; and,
a drive mechanism manipulating the position of the movable wall assembly along the waveguide parallel to the propagation path of the energy,
wherein the motion by the drive mechanism changes an elevation angle of a portion of the energy propagating in the waveguide exiting through the guide slot.
16. The system of claim 15, wherein the lens is spherical.
17. The system of claim 16, wherein the waveguide is curved and the curvature of the waveguide substantially approximates the curvature of the spherical lens.
18. The system of claim 15, further comprising a rotary joint adjacent to a delivery point of the waveguide of the propagating energy.
19. The system of claim 15, wherein the moveable wall assembly comprises a moveable wall portion.
20. The system of claim 19, wherein the moveable wall assembly comprises a plurality of guide slots, each having a width dimension and a length dimension.
21. The system of claim 20, wherein each of the plurality of guide slots has the same length dimension and the same width dimensions.
22. The system of claim 20, wherein each of the plurality of guide slots has a different width dimension.
23. The system of claim 15, wherein said movable wall assembly comprises:
a first moveable wall portion having a single guide slot having a width dimension; and
a second moveable wall portion proximate to the first moveable wall portion, having a plurality of guide slots,
wherein each guide slot in the second moveable wall portion has a width that is less than the width of the guide slot in the first moveable wall portion, and
wherein the second movable wall portion and the first movable wall portion move independently to align at least one of the plurality of guide slots of the second moveable wall portion with the guide slot of the first moveable wall portion to vary a beam shape of the exiting energy.
24. The system of claim 23, wherein each of the plurality of guide slots in the second moveable wall portion has a different width dimension.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An ECG electrode structure for measuring a difference in potential, the structure comprising
a first measurement electrode arranged to be in contact with an area of the skin on a user’s body such that, when in use, the electrode is electrically insulated from water, and
a second measurement electrode, which, when in use, is arranged to be in contact only with the water, the second measurement electrode thus being in contact through the water to some other area of the person’s body than the area under the first measurement electrode.
2. An ECG electrode structure according to claim 1, wherein the first measurement electrode and the second measurement electrode on the cover encapsulating the electrode structure are arranged on cover surface sides facing away from each other.
3. An ECG electrode structure according to claim 1, comprising an ECG detection block inside the cover encapsulating the ECG electrode structure for producing heart rate information on the basis of ECG signal measurements carried out by the measurement electrodes.
4. An ECG electrode structure according to claim 1, comprising a transmitter inside the cover encapsulating the ECG electrode structure.
5. An ECG electrode structure according to claim 4, wherein the transmitter is arranged to use telemetry to transmit heart rate information to a separate heart rate receiver for display andor storage andor further analysis.
6. An ECG electrode structure according to claim 1, comprising a display for displaying heart rate information.
7. An ECG electrode structure according to claim 6, wherein the display is a LED display comprising at least one LED.
8. An ECG electrode structure according to claim 7, wherein the display comprises LEDs of different colours.
9. An ECG electrode structure according to claim 1, comprising a third measurement electrode which, when in use, is arranged to be placed in contact with an area of the skin on the user’s body.
10. An ECG electrode structure according to claim 9 comprising means for measuring both a first impedance between the second measurement electrode and the first measurement electrode and a second impedance between the third measurement electrode and the first measurement electrode.
11. An ECG electrode structure according to claim 10 comprising means for concluding, on the basis of the measured first and second impedances, whether the ECG electrode structure is in the water or in the air, and for selecting the second measurement electrode for measurement in the water and the third measurement electrode for measurement in the air, in addition to the first measurement electrode.
12. An ECG electrode structure according to claim 9 comprising means for measuring a potential difference between the first electrode and the second electrode, for concluding, on the basis of the measurement, whether the ECG electrode structure is in the water or in the air, and for selecting the second measurement electrode for measurement in the water and the third measurement electrode for measurement in the air, in addition to the first measurement electrode.
13. An ECG electrode structure according to claim 1, wherein the measurement electrode is made of conductive plastic.
14. An ECG electrode structure according to claim 1, wherein the measurement electrodes are integrated to form a part of the cover encapsulating the ECG electrode structure.
15. An ECG electrode structure according to claim 10, wherein the cover is made by injection moulding.
16. A method for measuring an ECG signal from a person who is in water, the method comprising
measuring a difference in potential between a second measurement electrode and a first measurement electrode placed in contact with an area of the skin on the person’s body such that, when in use, it is electrically insulated from the water,
wherein the second measurement electrode is arranged to be in contact only with the water, the second measurement electrode thus being in contact through the water to some other area of the person’s body than the area under the first measurement electrode.
17. A method according to claim 16, wherein a third measurement electrode is used, the electrode being arranged in contact with an area of the skin on the person’s body.
18. A method according to claim 17, wherein both a first impedance between the second measurement electrode and the first measurement electrode is measured and a second impedance between the third measurement electrode and the first measurement electrode is measured.
19. A method according to claim 18, the method comprising concluding, on the basis of the measured first and second impedances, whether the ECG electrode structure is in the water or in the air, and selecting the second measurement electrode for measurement in the water and the third measurement electrode for measurement in the air, in addition to the first measurement electrode.
20. A method according to claim 14, the method comprising measuring a potential difference between the first electrode and the second electrode and concluding, on the basis of the measurement, whether the ECG electrode structure is in the water or in the air, and selecting the second measurement electrode for measurement in the water and the third measurement electrode for measurement in the air, in addition to the first measurement electrode.
21. A method according to claim 14, the method comprising producing heart rate information on the basis of ECG signal measurements carried out by the measurement electrodes.
22. A method according to claim 14, the method comprising using telemetry to transmit heart rate information to a separate heart rate receiver for display andor storage andor further analysis.
23. A method according to claim 14, wherein a display connected to the ECG electrode structure is used for displaying heart rate information.
24. A method according to claim 23, wherein the display is a LED display comprising at least one LED.
25. A method according to claim 24, wherein the display comprises LEDs of different colours.