A planar UWB antenna based on MB-OFDM applications with switchable dual band-notched for cognitive radio systems

2014 ◽  
Vol 8 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Vahid Sharbati ◽  
Pejman Rezaei ◽  
Ali Shahzadi ◽  
Mohammad M. Fakharian
Keyword(s):  
Cognitive Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Simple Structure ◽  
Dual Band ◽  
Frequency Division ◽  
Uwb Antenna ◽  
Compact Size ◽  
Cognitive Radio Systems ◽  
Radio Systems ◽  
Left And Right

In this paper, a switchable antenna with capability to operate in ultrawideband (UWB) frequency from 3 to 10.7 GHz with two switchable notch bands of 3.3–3.7 and 3.7–4.2 GHz, is presented for cognitive radio (CR) and multiband orthogonal frequency-division multiplexing (MB-OFDM) applications. The proposed antenna has a simple structure and compact size of 17 × 24 mm2. The antenna in the UWB characteristics is obtained using a circular radiator patch with an embedded T-slot on the patch and a rectangular parasitic element that is attached to the patch. The reconfigurability is also achieved by two L-shaped parasitic elements placed in the left and right of the patch that two ideal switches is inserted over the these elements and the circular patch. The function of the antenna can be changed by tuning status of the switches that make the notch bands in application frequencies. The measurement and simulation results show that the antenna has good characteristics for CR application and MB-OFDM, where the UWB antenna is required for spectrum sensing and the switchable band rejection antenna is used for reconfigurable operation.

A DUAL-PORT ANTENNA FOR WIDE AND NARROWBAND APPLICATIONS

2015 ◽  
Vol 77 (10) ◽  
Author(s):  
Sahar Chagharvand ◽  
M. R. Hamid ◽  
M. R. Kamarudin
Keyword(s):  
Cognitive Radio ◽  
Ground Plane ◽  
Single Band ◽  
The Other ◽  
Dual Band ◽  
Pin Diode ◽  
Operating Range ◽  
Cognitive Radio Systems ◽  
Radio Systems ◽  
Triple Band

This paper presents a study on a dual port antenna with wide and narrowband functionality. The proposed structure incorporates two antennas into a single substrate by sharing same ground plane. In this structure, two ports are used. One port is used for wideband function that works from 1 to 3.7 GHz. The other one is used for reconfigurable narrowband operation, which supports single, dual and triple-band modes. Reconfiguration of the narrowband antenna is achieved by means of PIN diode switches. The single-band operates at 2 GHz. The dual-band provides two center frequencies at 1.8 GHz and 2.4 GHz, while the triple-band operates at 1.4, 1.8, and 2.6 GHz. The coupling between the two ports is signified by the S12 and S21 parameters. The coupling is below -10dB across the full operating range of the antenna measured in S12 and S21 parameter. These features are potentially useful for Cognitive Radio systems.

scholarly journals A Compact CPW-Fed UWB Antenna with Dual Band-Notched Characteristics

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Aiting Wu ◽  
Boran Guan
Keyword(s):  
Simple Structure ◽  
Ground Plane ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Uwb Antenna ◽  
Compact Size ◽  
Excellent Candidate ◽  
Uwb Applications ◽  
Good Agreement

A compact CPW-fed planar UWB antenna with dual band-notched property is presented. The dual band rejection is achieved by etching a C-shaped slot on the radiation patch and two L-shaped parasitic strips in the ground plane. The experimental and measured results show that the proposed antenna exhibits an impedance bandwidth over an ultrawideband frequency range from 2.4 to 12.5 GHz with VSWR less than 2, except for two stopbands at 3.3 to 3.75 GHz and 5.07 to 5.83 GHz for filtering the WiMAX and WLAN signals, respectively. It also demonstrates a nearly omnidirectional radiation pattern. The fabricated antenna has a tiny size, only 32 mm × 32 mm × 0.508 mm. The simulated results are compared with the measured performance and show good agreement. The simple structure, compact size, and good characteristics make the proposed antenna an excellent candidate for UWB applications.

scholarly journals Design of UWB Monopole Antenna with Dual Notched Bands Using One Modified Electromagnetic-Bandgap Structure

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Hao Liu ◽  
Ziqiang Xu
Keyword(s):  
Simple Structure ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Ultra Wideband ◽  
Dual Band ◽  
Area Network ◽  
Electromagnetic Bandgap ◽  
Uwb Antenna ◽  
Compact Size

A modified electromagnetic-bandgap (M-EBG) structure and its application to planar monopole ultra-wideband (UWB) antenna are presented. The proposed M-EBG which comprises two strip patch and an edge-located via can perform dual notched bands. By properly designing and placing strip patch near the feedline, the proposed M-EBG not only possesses a simple structure and compact size but also exhibits good band rejection. Moreover, it is easy to tune the dual notched bands by altering the dimensions of the M-EBG. A demonstration antenna with dual band-notched characteristics is designed and fabricated to validate the proposed method. The results show that the proposed antenna can satisfy the requirements of VSWR < 2 over UWB 3.1–10.6 GHz, except for the rejected bands of the world interoperability for microwave access (WiMAX) and the wireless local area network (WLAN) at 3.5 GHz and 5.5 GHz, respectively.

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