Deep band‐notched ultra‐wideband planar monopole antenna using meander lines

Abstract

The article presents the design of a planar ultra‐wideband (UWB) monopole antenna with a deep band‐notched characteristic. The antenna has an elliptical radiator fed by a microstrip line and a small ground‐plane size of 30×15 mm2. Two pairs of meander lines (MLs) are employed to implement the deep band‐notched characteristic. One pair of the MLs is placed closely on both sides of the microstrip‐feed line with one of their ends shorted to ground. The other pair is placed at the upper edges of the ground plane on the other side of the substrate. The frequency range of the notched band can be controlled by the dimensions of the MLs. In our studies, the notched band is designed in the frequency band from 5.1 to 5.85 GHz to suppress the signals in the WLAN system. The antenna is studied and optimized using computer simulation. For verification of simulation results, the antenna is fabricated and measured. Results show that, by using the two pairs of MLs, the gain of the antenna at the notch frequency can be suppressed by 14 dB, with the efficiency reduced to less than 5%. Due to the small ground‐plane size used in the antenna, the feeding cable used for measurements in the measurement equipment has significant effects on the measured results. This leads to large discrepancies between the simulated and measured results at low frequencies. To study this, the model of the feeding cable is also included in simulation and the results show that the discrepancies are substantially reduced. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1085–1091, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27521

Compact multiple‐input–multiple‐output antenna using quasi‐self‐complementary antenna structures for ultrawideband applications

“…The UWB technology makes use of an extremely wide frequency band to transmit signals at a low-power level, and hence has the advantages of high data rates and a low interference. Recently, considerable efforts have been made to design UWB antennas for portable applications [2][3][4][5][6][7][8][9][10]. Among many possible designs, self-complementary antenna (SCA) first reported several decades ago in [4] for its broadband characteristic is quite attractive.…”

“…The major advantage of the QSCA is the ability of achieving a wide bandwidth with a very compact size. In [6], the QSCA achieved a very compact size of 19 × 16 mm 2 . Thus, the QSCA has a great potential for use in the design of compact multiple-input-multiple-output (MIMO) antennas for portable UWB devices, which is the objective of the study in this paper.…”

Generating a Reconfigurable Notch Band for Planar UWB Monopole Antennas

“…A simple solution to this problem is to design the UWB antennas with band‐notched characteristics to suppress interference from these systems. Techniques using different resonators such as parasitic strips, meander lines, split‐rings and slots have been proposed to design band‐notched characteristics for planar UWB monopole antennas . Some of these techniques could generate multiple notch bands to suppress interference for several systems , but the antennas were required to have more space to accommodate more resonators.…”

“…Some of these techniques could generate multiple notch bands to suppress interference for several systems , but the antennas were required to have more space to accommodate more resonators. While, the other techniques in , although required less antenna space, could generate only a single notch. All the notches generated in had fixed frequencies.…”

“…While, the other techniques in , although required less antenna space, could generate only a single notch. All the notches generated in had fixed frequencies. In operating the 802.11 a/n WLAN systems, different countries have different regulations to the allowable channels within the WLAN frequency ranges and the regulations are subject to change at any time, thus it is more desirable to design UWB antennas with reconfigurable notch bands.…”