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What is Frequency Independent Antenna

Chapter 3
Handbook of Research on Advanced Trends in Microwave and Communication Engineering
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.
Published in Chapter:
Design and Analysis of an UWB Printed Monopole Antenna with Hilbert Curve Fractal Shaped Slots for Multiple Band Rejection Functionality
Anirban Karmakar (Tripura University, India)
Copyright: © 2017 |Pages: 30
DOI: 10.4018/978-1-5225-0773-4.ch003
Abstract
In this chapter, a compact dual band notched Ultrawideband (UWB) antenna with fractal shaped Hilbert curve slots (HCS) is presented. The antenna covers the frequency band from 2.5 GHz to 12 GHz for VSWR=2 and also shows stable radiation patterns throughout the operating frequency band. By introducing Hilbert Curve fractal Slots (HCS) in the antenna, band notch characteristics have been achieved. The HCS renders the capability to reject 5.15-5.825 GHz band assigned for IEEE 802.11a and HYPERLAN/2 and also 7.9-8.4 GHz band assigned for X-Band uplink satellite communication systems where the gain is suppressed very well in the desired WLAN and X-Band. The antenna gain varies from 3dBi to 5dBi over the operating band. Novelty of this design lies in achieving miniature notch structure which has higher degree of freedom for adjusting notch parameters and unsusceptible to coupling with other notches. The antenna can be used for various mobile communication services such as DCS, IMT-2000, UMTS, DMB and UWB.
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