Printed monopole antenna with tunable band-notched characteristic for use in mobile and ultra-wide band applications

Abstract

International Journal of vol. 25,no. 5, ABSTRACTA tunable band-notch printed monopole antenna is presented, exhibiting a wide impedance bandwidth from 1.5 to 5.5 GHz with good impedance matching (VSWR ≤ 2) and a tunable rejected frequency band from 2.38 to 3.87 GHz. The band-notching is achieved by adding an inner chorded crescent element within a driven element of a similar shape. By varying the value of the varactor which is placed between the inner and outer arcs, the desired variable rejected can be obtained. Simulated and measured results show wide impedance bandwidth with a tunable band notch, stable radiation patterns, and consistent nearly constant gain. The antenna is suitable for mobile and portable applications.

Compact Planar Ultrawideband Antennas With Continuously Tunable, Independent Band-Notched Filters

“…This strategy has been accomplished successfully by integrating ON/OFF switch-type active elements, such as p-i-n diodes [8][9][10][11][12][13][14][15], micro-electromechanical system (MEMS) switches [16][17], shorting circuits [18], stepper motors [19], and optically controlled microwave switches (OCMSs) [20][21], into these UWB antennas. On the other hand, embedding continuously tunable voltage or current elements, for instance, varactors [22][23][24][25][26][27][28][29][30][31][32][33], into similar UWB antennas empowers one's ability to continuously tune their band-notch frequency windows.…”

“…However, to the best of our knowledge, the UWB antennas with embedded varactors that have been reported to date have only achieved a single frequency-agile notch-band. In other words, at any one dynamical time, they only provide one notched-band [22][23][24][25][26][27][28][29][30][31][32][33]. They do not satisfy the cognitive radio requirements of being able to handle multiple band-notches at any one dynamical time.…”

A Vivaldi Antenna With Switchable and Tunable Band-Notch Characteristic

“…Based on the results, the Vivaldi antenna demonstrates excellent directionality. Table 1 compares the characteristics of the proposed Vivaldi antenna to other designs in [11][12][13][14][15][17][18][19]. It is obvious that the antenna proposed in this paper has wider notched band tuning range.…”

“…It cannot be tuned continuously. In [11][12][13][14][15][16][17], varactor diodes are inserted to obtain tunable notched band. In [18,19], the notched band can be adjusted by loading a variable capacitor.…”

Ompact CPW Fed Switchable Uwb Antenna as an Antenna Filter at Narrow-Frequency Bands

“…In this regard, various tunable band-notched UWB antennas have been reported over the last decade [14][15][16][17][18][19][20][21][22][23]. These UWB antennas actually implement the strategy of PIN diodes, shorting circuits, microelectromechanical switches (MEMS), stepper motors, and optically controlled switching techniques.…”