Design of compact reconfigurable ultra‐wideband slot antenna with switchable single/dual band notch functions

Abstract-A novel printed reconfigurable square slot antenna with switchable right/left-handed circular-polarization (CP) and switchable dual-band performances for use in DCS/WiMAX applications is designed and manufactured. In the proposed antenna, in order to create a reconfigurable structure with switchable dual-band performance, a meander-line shaped radiating stub is utilized. This radiating stub can select between two operating frequency bands with respect to the number of its steps, and also right-or left-handed circular polarization at one of the operating bands (WiMAX) is determined by the growth direction of this meander-line structure. Moreover, through embedding an L-shaped slot on the ground section, circular polarization can be provided for the other operating frequency band (DCS). Having right-or left-handed circular polarization at this frequency band can be determined by the location and orientation of the L-shaped slot on the ground plane. In order to achieve a reconfigurable antenna structure with simultaneous switchable dual-band and circular polarization functions, six PIN diodes were utilized. The designed antenna has a small size of 30 × 30 mm. Simulated and experimental results obtained for the designed antenna reveal good radiation behavior within the DCS (1.85 GHz) and WiMAX (3.5 GHz) frequency ranges.

Section: Introductionmentioning

confidence: 90%

“…Using a printed slot antenna is a possible method to prevent the increment of antenna size while improving the operational bandwidth [6]. Consequently, a number of printed slot antennas with different geometries have been reported recently to achieve CP radiation [7,8].…”

Section: Introductionmentioning

confidence: 99%

CPW-Fed Small Slot Antenna With Reconfigurable Circular Polarizion and Impdeance Bandwidth Characteristcis for DCS/Wimax Applications

Valizade¹,

Ojaroudi²,

Ojaroudi³

2015

“…Hence, using reconfigurable band-notch structure can improve the performance of the UWB system. In reconfigurable band-notch UWB antennas, changing the notch frequency is achieved by using lumped elements such as PIN diodes or varactor diodes [27][28][29]. PIN diodes are used as a switch by applying a dc voltage on its terminals [27,29].…”

Section: Introductionmentioning

confidence: 99%

New Simple Flower Shaped Reconfigurable Band-Notched Uwb Antenna Using Single Varactor Diode

Mohamed¹,

Elkorany²,

Saad³

et al. 2017

Abstract-In this paper, a new flower-shaped microstrip line feed reconfigurable band-notched UWB monopole antenna using single varactor diode is introduced and fabricated. Different notch frequencies can be obtained using different capacitance values. The effect of changing the varactor position is also examined. The flower shape is first optimized to obtain UWB characteristics. Then, a slot is made in the microstrip line to be loaded later with a single varactor diode. A wide range of notch frequencies can be obtained using this simple configuration which covers most of the narrow band coexistence systems. The notch frequency can be lower by increasing the capacitance value. The notch frequency covers the WLAN band when C = 0.8 pF and covers the WiMAX band when the capacitance is changed to 0.7 pF for the same antenna configuration and varactor position. Two prototypes of the proposed antenna using two different single capacitor elements with capacitances 0.6 pF and 1.5 pF are fabricated, and their reflection characteristics are measured and compared with the simulated ones. Notch frequencies at 6.1 GHz and 4.3 GHz are obtained respectively in both simulated and measured antenna structures. The proposed antenna has a directive radiation pattern in E-plane and omnidirectional pattern in Hplane. Also, the gain is suppressed in the notched frequencies. The group delay is nearly stable in the UWB frequency range with very little variations, but it is distorted sharply at the notch frequencies. So, the proposed antenna is a good candidate for the modern UWB systems.

“…For minimizing the interference between narrow band and UWB systems, several types of printed antennas with reconfigurable band notch characteristics have also been proposed in the literature [9][10][11]. Some studies also highlight the use of p-i-n diode, varactor diode and RF micro-electromechanical system (MEMS) switches towards the design of reconfigurable printed antennas that are able to switch between available spectrums besides providing complete coverage within UWB and band-notched UWB of the single/dual tunable bands [9][10][11][12][13]. The use of switchable and tunable notch in UWB filter incorporating a total of sixteen p-i-n diodes connected in parallel has also been proposed by some researchers [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Frequency Reconfigurable Monopole Antenna With Switchable Characteristics Between Band-Notched Uwb and Wlan Applications

Yadav¹,

Abegaonkar²,

Koul³

et al. 2017

Abstract-This paper presents a novel frequency reconfigurable monopole antenna that has switchable notch characteristic at center frequency of 5.3 GHz. The proposed antenna consists of a defective ground structure (DGS) to enhance the impedance bandwidth from 3.17 to 13 GHz. The F-shaped parasitic element with three stubs (two vertical and one horizontal) are located on the back side of the radiating patch to achieve the band rejection characteristics from 4.9 GHz to 5.7 GHz. The metallic ground plane structure is connected or disconnected to the F-shaped parasitic element through stubs by means of p-i-n diodes. Experimental demonstration of applications of the proposed antenna structure as 5.3 GHz notched band ultra-wideband (UWB) antenna with all diodes in the OFF-state and as 5.3 GHz radiator for wireless local area network (WLAN) with all diodes in the ON-state is reported. In both the cases, good agreements between measured and simulated return losses, radiation patterns and realized gains are observed.