Frequency Notched Wide Band Planar Monopole Antennas

Rahmati, B.; Hassani, Hamid Reza

doi:10.2528/pierc09061703

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…Most of the work reported so far is based on the simple U-shaped slots [3][4][5][6][7], the width of which covers the whole width of the monopole plate antenna. To create multiband notches requires placing more U-slots within each other.…”

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confidence: 99%

Wideband planar plate monopole antenna with dual tunable notch

Rahmati

Hassani

2010

Electron. Lett.

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A tunable dual notch planar plate monopole antenna operating over 3 -16 GHz bandwidth is introduced. To create the notch, a modified U-slot is placed on the monopole plate. Owing to the narrow width of the modified U-slot several slots can be placed on top of each other to create multiple notch-bands over the antenna operating bandwidth. The results for an antenna with two modified U-slots are presented. By placing a small capacitor on each of the slots in a suitable position, it is shown that the centre frequency of each notch can be individually shifted downwards by up to 2 GHz, without changing the notch-bandwidths. Simulated as well as measured results are presented and compared.Introduction: Over the past few years there has been a rapid growth in the design of microwave antennas that can operate over a broad bandwidth. Over this bandwidth, there are a few narrow bands, such as WiMAX, Wireless Local Area Network (WLAN), HYPERLAN/2 systems, etc., that are allocated for certain applications that need to be filtered from the bandwidth of the antenna. It is desirable for the antenna to have this filtering capability without introducing extra circuitry. Several antennas with band-notch characteristics have been investigated.A wideband antenna that has received much attention, owing to its simplicity in design, low cost of fabrication and which has an omnidirectional pattern, is the planar plate monopole antenna. Versions of this antenna can cover the 2 -16 GHz band [1, 2].One of the techniques to create multiband behaviour in the planar plate monopole antenna is by cutting a slot inside the antenna. Most of the work reported so far is based on the simple U-shaped slots [3][4][5][6][7], the width of which covers the whole width of the monopole plate antenna. To create multiband notches requires placing more U-slots within each other. This limits the antenna to having up to two band notches. Furthermore, the simple U-slots cannot create a notch near the lower limits of the antenna bandwidth.In this Letter, a multiband tunable notch planar plate monopole antenna is proposed. The notch is created by using a modified U-slot (MU-slot). The shape of the MU-slot is such that several slots can be placed on top of each other over the width of the monopole antenna, resulting in multi-notch behaviour. The notch centre frequency can be tuned either by changing the parameters of the MU-slot or by placing a small capacitor at a particular position along the MU-slot. The latter has the advantage that once the monopole antenna is constructed, by a capacitor we can easily change the notch centre frequency. Simulation results based on the software package HFSS along with experimental results are provided and discussed.

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confidence: 99%

Wideband planar plate monopole antenna with dual tunable notch

Rahmati

Hassani

2010

Electron. Lett.

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“…The configuration of single‐band notch antenna is shown in Figure 1(b). At the frequency range that the open‐circuit stub length is almost λ /4, the stub leads to the desired high attenuation and impedance mismatching, resulting in bandstop behavior [11]. As shown, to excite the added stub efficiently, it can be located along the feed line, which the maximum current is flown around.…”

Section: Antenna Designmentioning

confidence: 99%

A tunable dual band notch on a UWB printed slot monopole antenna by using open circuit stubs

Nezhad

Dadashzadeh

Foudazi

2011

Micro & Optical Tech Letters

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A new printed wide slot antenna with single‐ and dual‐band notch behavior is presented. The base of antenna is a simple fork‐shaped radiating patch, which covers the ultra‐wideband (UWB) frequency range. By using additional protrudent open circuit stubs on the base patch, multiband notch behavior is obtained. Effects of varying the added stubs parameters on the antenna performance show that the center frequency of band rejections can be finely tuned. The proposed dual‐band notch antenna covers 2.4–10 GHz with two bands rejection for WiMAX (3.3–3.9 GHz) and WLAN (5.7–6 GHz) bands. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26095

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“…Most distinguished among them is the Wireless Local Area Network (WLAN), which operates with the center frequency of 2.4 GHz (2400-2484 MHz), 5.2 GHz (5150-5350 MHz) and 5.8 GHz (5725-5825 MHz). To lessen this interference problem, different UWB antennas with band notched properties have been developed [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The simple and most commonly used approach is to integrate diverse shapes and sizes of slots into the radiator.…”

Section: Introductionmentioning

confidence: 99%

Compact Uwb Antenna With Inverted Hat Shaped Resonator and Shortening via Pins for Filtering Properties

Pouyanfar¹,

Rezaeieh²

2012

PIER Letters

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A modified ultra-wideband (UWB) printed rectangular antenna fed by a microstrip line is proposed. Overall dimension of the antenna is as compact as 14 × 14 × 1 mm 3. The main features of the proposed antenna are its compact size and its filtering characteristic over WLAN band. Through adjusting the dimensions of the elements of the antenna, notch frequency in different ranges of the UWB can be obtained. The resulting VSWR < 1.5 impedance bandwidth is between 3.6-9.6 GHz. Antenna presents a stable gain and omnidirectional radiation pattern in its operational frequencies.

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Frequency Notched Wide Band Planar Monopole Antennas

Cited by 6 publications

References 14 publications

Wideband planar plate monopole antenna with dual tunable notch

Wideband planar plate monopole antenna with dual tunable notch

A tunable dual band notch on a UWB printed slot monopole antenna by using open circuit stubs

Compact Uwb Antenna With Inverted Hat Shaped Resonator and Shortening via Pins for Filtering Properties

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