A compact wide-slot UWB antenna with reconfigurable and sharp dual-band notches for underlay cognitive radio applications

Abstract

This paper presents a compact wide-slot ultrawide-band (UWB) antenna with reconfigurable and sharp dual-band notches compatible with the underlay cognitive radio systems. The antenna slot and tuning stub are reshaped in such a way that the proposed antenna operating bandwidth extends along the frequency band specified for UWB applications (3.1-10.6 GHz). In spite of their sharpness, the generated band notches perfectly cancel the interference with the entire 5 GHz wireless local area network (WLAN) frequency band (5.15-5.725 GHz) and that of the military X-band satellite communications downlink (7.25-7.745 GHz). The WLAN band notch is presented by attaching a pair of quarter wavelength parasitic elements to the antenna ground plane, while the other band notch is produced by engraving another pair of half wavelength parasitic elements within the antenna wide slot along the circumference of the antenna tuning stub. The reconfiguration of the band notches is achieved by inserting a pair of PIN diodes for each pair of parasitic elements. The simulated and measured results accentuate the UWB coverage of the proposed antenna, and also verify the reconfigurability and the sharpness of the antenna band notches. Moreover, the antenna has a noticeably stable radiation pattern over the entire band of operation with omnidirectional pattern convenient for portable UWB gadgets.

Design and Analysis of Novel Ring UWB Antenna

“…Depending on the increase in applications in this frequency band, the need for broadband antenna designs that will cover the entire UWB band is also increasing [2][3][4]. When viewed from this perspective, the microstrip monopole structures are the suitable candidate for designing UWB antennas due to their prominent features such as small size, being cheap, being easy of manufacturing and Omni-directional radiation patterns [5][6][7]. When the literature is examined that, the many monopole antennas have been presented for the UWB or narrow band applications with the different shaped radiators [8][9][10][11].…”

A Low-Cost Microwave Filter with Improved Passband and Stopband Characteristics Using Stub Loaded Multiple Mode Resonator for 5G Mid-Band Applications

“…Many researchers have proposed the Multiple Mode Resonators (MMR) to be the basis in the design of compact microwave bandpass filters (BPF) [12][13][14][15][16][17][18][19][20][21][22]. The MMR was used to generate a multi-band band-pass filtering response [12], and the slot line version of the MMR was utilized to design a differential mode BPF [13].…”

“…A combination of MMRs was devoted to design a sept-band BPF [18]. The MMR was attached to antennas to provide a stopband antenna radiation [19] or sharp bandpass radiation [20,21].…”

Investigation of Broadband Printed Biconical Antenna with Tapered Balun for EMC Measurements

“…The antennas used for the EMC test should have specific characteristics such as wide bandwidth, high gain, omnidirectional radiation pattern, and good antenna factor. These designed antennas are intended to work in the very high frequency (VHF) and ultra-high frequency (UHF) bands (30-1000 MHz and 1000-3000 MHz, respectively) [8], to detect the interference emitted from the most critical applications in these bands such as GSM (850-900 MHz), LTE (1800 MHz), UMTS or 3G (2100 MHz), Wi-fi, Bluetooth, Zigbee and more (2400 MHz) [9,10]. VHF Telecommunications Standards Institute (ETSI).…”

“…interference emitted from the most critical applications in these bands such 900 MHz), LTE (1800 MHz), UMTS or 3G (2100 MHz), Wi-fi, Bluetooth, Zi (2400 MHz) [9,10]. VHF and UHF bands are classified based on the Euro munications Standards Institute (ETSI).…”