Abstract: A planar, truncated imaging probe having a large surface area for medical imaging is disclosed. The planar imaging probe includes first and second conductive members that are adapted at their respective first ends to couple to a radio frequency source. The second ends of the first and second conductive members are electrically short-circuited together to form an electrical circuit. The second conductive member has a length and width that is greater than the length and width of the first conductive member so a side of the first conductive member is covered by the second conductive member. The first conductive member is preferably composed of two slanting surfaces that join at an apex while the second conductive member includes a planar member and upwardly sloping sides to further shield the first conductive member. The first and second conductive members may be separated by electrical isolation stand-offs to improve the rigidity of the first conductive member for supporting the sample to be imaged.