Rumsey’s principle suggests that the impedance and pattern properties of an antenna will be frequency independent if the antenna shape is specified only in terms of angles. To satisfy the equal-angle requirement, the antenna configuration needs to be infinite in principle, but is usually truncated in size in practice. This requirement makes frequency-independent antennas quite large in terms of wavelength. Rumsey’s principle has been verified in spiral antennas, conic spiral antennas and some log periodic antennas. Learn more in: Design and Analysis of an UWB Printed Monopole Antenna with Hilbert Curve Fractal Shaped Slots for Multiple Band Rejection Functionality