Frequency-Agile Dual-Band Direct Conversion Receiver for Cognitive Radio Systems

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.

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A Novel and Compact Multi Frequency-Agile Slot Antenna for Cognitive Radio Systems

Advanced Computational Techniques in Electromagnetics ◽

10.5899/2015/acte-00202 ◽

2015 ◽

Vol 2015 (2) ◽

pp. 90-99

Author(s):

Rajeev Kumar ◽

Ritu Vijay

Keyword(s):

Cognitive Radio ◽

Slot Antenna ◽

Frequency Agile ◽

Cognitive Radio Systems ◽

Radio Systems

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Tunable multi-band direct conversion receiver for cognitive radio systems

2009 IEEE MTT-S International Microwave Symposium Digest ◽

10.1109/mwsym.2009.5165671 ◽

2009 ◽

Cited By ~ 12

Author(s):

Erick Emmanuel Djoumessi ◽

Ke Wu

Keyword(s):

Cognitive Radio ◽

Direct Conversion ◽

Cognitive Radio Systems ◽

Radio Systems ◽

Multi Band

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

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078714001317 ◽

2014 ◽

Vol 8 (1) ◽

pp. 95-102 ◽

Cited By ~ 6

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.

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