A pair of pin diodes in the middle of the slot on the radiation patch. The antenna structure consists of a sensing antenna and a frequency reconfigurable antenna system. Uwb and reconfigurable antennas for cognitive radio application using mems technology ms. Elliptical patch and capacitors are used in the design, but this leads to large size, complexity and unsymmetrical structure. Wireless communication and sensing systems have experienced enormous development over the past two decades.
A wideband slot antenna with frequency and patternreconfigurable characteristics for tdlte 3. Cognitive radio is an intelligent wireless communication system that is aware of its surrounding environment i. In the cognitive radio model, ultrawideband antennas are employed for free channels identification and reconfigurable narrow band antennas for communication. Design of frequency reconfigurable antenna using varactor. Reconfigurable circular ring patch antenna for uwb and. Reconfigurable circular ring patch antenna for uwb and cognitive radio applications. Frequency reconfigurable microstrip patchslot antenna. Reconfigurable double cslot microstrip patch antenna fed by 50. This article mainly focuses on the concept of cognitive radio paradigm in the ultrawideband 3. Wideband, multiband, and smart reconfigurable antennas for modern wireless communications showcases current trends and novel approaches in the design and analysis of the antennas that make wireless applications possible, while also identifying unique integration opportunities for antennas and wireless applications to work together. Introduction reconfigurable antenna reveals various beneficial compared to the conventional antenna at the same class. A gridslotted patch with two tunable varactors is placed on the top layer, a microstrip line is placed in the middle of two substrates. Pdf reconfigurable wideband patch antenna for cognitive. The performance of the antennas designed by various techniques in terms of, the radiation.
A circular monopole with a rectangular microstrip antenna. The proposed structure has simple design and easy construction, making it reconfigurable by enabling or disabling the parasitic elements coplanar to the antenna. Reconfigurable wideband circularly polarized stacked. A new reconfigurable antenna design for cognitive radio. Design of frequency and patternreconfigurable wideband. Then, switches are incorporated into the filtering uwb antennas to. A survey on uwb and reconfigurable antennas for cognitive. National aeronautics and space administration glenn research center. For cognitive radio application, both, a wideband antenna for channel sensing and a reconfigurable antenna for communication are. Frequency reconfigurable microstrip antenna for cognitive. His recent research interest focuses on wideband antenna, patch antennas, base station antennas, reconfigurable antennas and the antennas for cognitive radio. Reconfigurable antennas synthesis lectures on antennas. Liquid metal bandwidth reconfigurable antenna request pdf.
Many researchers have been concentrating on designing antennas for cognitive radio in recent. The proposed antenna senses the spectrum by semicircular structure from 3 ghz to 10 ghz to identify the spectrum conditions. In this scheme, an antenna should be able to monitor the spectrum sensing. In 3, a frequency reconfigurable antenna to cover either the 3.
A very compact reconfigurable ultrawideband uwb steppedslot antenna for cognitive radio cr applications is presented in this letter. Reconfigurable wideband patch antenna for cognitive radio. The antenna has a partial ground plane with a rectangular slot to. The microstrip antenna with a switch in the slot structure makes the antenna reconfigurable. Tripathi, wideband to concurrent triband frequency reconfigurable microstrip patch antenna for wireless communication, international journal of microwave and wireless technologies, vol. Reconfigurable microstrip antennas for cognitive radio intechopen. The frequency agility is achieved via a rotational motion of the patch antennas. The simulation result shows that the sensing antenna works in the range of about 8 to 17 ghz while reconfigurable antenna shows frequency variation from 12. Cognitive radio system fundamentals and antenna requirements for its smooth operations are also discussed. A versatile reconfigurable antenna for cognitive radio. This antenna has been highlighted in iet electronics letter as the first multifunction antenna to combine wideband, notch and narrowband modes. Section ii introduces the design approach of reconfigurable microstrip antenna. Implementation of a cognitive radio frontend using. From 1999 until the present day, microstrip antenna has been used as a platform to design reconfigurable antenna 612.
A uwb antenna with reconfigurable rejection band using. The frequency tuning is performed by switching on and off two patches. Reconfigurable double cslot microstrip patch antenna fed by 50 ohm microstrip line is proposed in this paper. This paper proposes a frequency reconfigurable antenna system designed for cognitive radio applications.
In the cognitive radio model, ultrawideband antennas are employed for free channels. The antenna consists of two stacked substrates and three metal layers. This paper also presents the working principle of cognitive radio model and the importance of uwb 3. This paper presents a novel lowprofile high gain frequency reconfigurable patch antenna with unidirectional radiation pattern by using a gridslotted patch with tunable varactors loading. A printed reconfigurable ultrawideband uwb monopole antenna with triple narrow bandnotched characteristics is proposed for cognitive radio applications in this paper. In 6, ultra wideband reconfigurable antenna is fixed with. Design and simulation of reconfigurable antenna for. Wideband, multiband, and smart reconfigurable antennas for. Therefore, in configurationii a very thin slit is etched in the uwb antenna, which separates the region. Reconfigurable wideband patch antenna for cognitive radio h. Wideband to concurrent triband frequency reconfigurable microstrip patch antenna for wireless communication volume 9 issue 4 sonia.
Reconfigurable multi band notches antenna for cognitive. The design can also be used for cognitive radio applications as described in. Description of smart permittivity material is presented in section iii. A reconfigurable patch antenna with independent frequency. In this paper, reconfigurable microstrip antenna with a very wide tunability range for overlay cognitive radio applications are presented. Reconfigurable wideband patch antenna for cognitive radio ieee. This patch is inspired from the circular monopole antenna cma with some modifications.
Reconfigurable bandnotched uwb antenna for cognitive. Keywords reconfigurable, patch antenna, cognitive radio, pin diode. Due to their lightweight, low cost, and ease of fabrication, patch antennas are attractive for wireless communications. Varactor diode switches can tune the operation band in a wideband or ultrawideband. Design and simulation of reconfigurable antenna for cognitive radio b. Recent developments of reconfigurable antennas for current and. Wideband and reconfigurable narrowband functionality may potentially be of advantageous in emerging wireless communication systems such as software defined radio and cognitive radio for wideband sensing and reconfigurable narrowband communication procedure. Fractal reconfigurable multiband communicating antenna for. Towards software defined antenna for cognitive radio. Design and performance issues of microstrip antennas. S3 1,2assistant professor 1,2,3department of electronics and communication 1,2r. Uwb and reconfigurable antennas for cognitive radio.
Nagar, chennai 3philips innovation campus manyata tech park, bangalore. A reconfigurable patch antenna structure is proposed and the frequency tuning is performed by switching in and out coplanar patches, switching in and out shorting posts and varying the voltage. In this letter, a survey of different recent state of the art techniques that have been deployed in the design of antennas that can perform excellently for cognitive radio application is carried out. Pdf a compact reconfigurable bandnotched uwb antenna is presented in this paper. Uwb antenna with reconfigurable triple band notched characteristics for cognitive radio 1554 characteristics at wimax 3. They are bringing information to us with convenience and flexibility at low cost. The antenna for cr should be able to sense wide band spectrum and operate at various available frequencies, it is the combination of both wideband and frequency reconfigurable antennas 3, 4. This paper presents a versatile reconfigurable antenna capable of spectrum sensing along with various reconfiguration features.
The wideband state is the sensing state and operationally covers 3. In this paper, a reconfigurable multi band notches antenna, for cognitive radio applications, is proposed. A pattern reconfigurable antenna with multibeam reconfiguration for satellite communication has also been reported in 4. After the approval of the utilization of ultrawide band uwb, operating. Design of mems reconfigurable eshaped patch antenna. The antenna can be operated as ultra wideband, and is reconfigurable in terms of the ability to select one or two notches band in the srr resonant frequency. In the proposed structure, an uwb antenna is also incorporated, making it suitable for cognitive radio communication.
It is intended for the application scenario in cognitive radio system. Two pin diodes are loaded in the slots to produce two different frequency bands. Reconfigurability is achieved by inserting pin diode switches in dmsdefected microstrip structure t slot filter. Abstracta reconfigurable wideband and multiband cslot patch antenna with dualpatch elements is proposed and studied. The antenna can operate in dualband or in very wide band mode in 5, 6 and 7 ghz bands.
A reconfigurable antenna consists of five different patches and there frequencies cover from 2. Barbosa kortright universities space research association. A key enabler for realization of a cognitive communication system is the capability of reconfigurability in the underlying hardware and the associated protocol suite. A compact cognitive radio uwbreconfigurable antenna. Cognitive radio paradigm and recent trends of antenna systems in. For the novel frequency and pattern reconfigurable yagiuda patch antenna detailed in chapter 4, two slots have been used on driven element to achieve frequency and pattern reconfigurability, and two openend stubs have been used to adjust working frequency and. After recognizing the spectrum condition, the proposed antenna can reconfigure its polarization state, bandwidth and radiation pattern. In this work, a new ultra wide band circular ring patch antenna is proposed for spectral sensing application as well as the transmission and reception of radiofrequency in cognitive radio systems. Pdf reconfigurable wideband patch antenna for cognitive radio. The first structure is an ultrawideband uwb antenna covering the spectrum from 3. Tripathi, an integrated frequency reconfigurable antenna for cognitive radio in uwb monopole without much affecting the s11 response, than this space can be reused to integrate another nb antenna. Reconfigurable wideband circularly polarized stacked square patch antenna for cognitive radios.
Keywords frequency reconfigurable antenna, mobile antenna, yagi uda antenna, patch antenna component. A reconfigurable triplenotchband antenna integrated with. The antenna demonstrated a wideband performance at 28 ghz, tunable narrowband rejection between 5. Cognitive radio system based on software defined architecture aims to improve the spectrum utilization by changing the transmitter parameters based on the interaction with the environment in which it operates 8. Budimir, reconfigurable wideband patch antenna for cognitive radio. Reconfigurable monopole antenna with defected ground. Conference on advances in computational tools for engineering.
An integrated frequency reconfigurable antenna for. The sensing antenna scans the channel to discover frequency bands while the reconfigurable section is tuning to communicate within these bands. In proceedings of the ieee fortythird asilomar conference on. In this paper, the design of wideband circularly polarized cp patch antennas for frequency reconfiguration in the physical layer of cognitive radios are. In 1999, a reconfigurable leaky patch antenna using pin diode was presented in 5. Reconfigurable antenna, ultrawideband, mutual coupling. Jianpeng wang jianpeng wang received the phd degree from the university of electronic science and technology of. The wideband mode can be obtained when both switches are in the on state with impedance bandwidth of 33. This paper focuses on the frequency reconfigurable antennas. Reconfigurable antenna structure for a wideband cognitive. A lowprofile frequency reconfigurable gridslotted patch. A new technology called cognitive radio cr has emerged to. The antenna can operate in two dualband modes and a wideband mode from 5 to 7 ghz.
State of the art techniques for cognitive radio antenna design. A reconfigurable microstrip patch antenna with switchable circular polarization using a piezoelectric transducer pet is reported in. The second structure is a frequency reconfigurable triangularshaped patch for. The total size of the ground plane is 50 x 50 mm 2. In this paper, a survey on ultrawide band and reconfigurable antennas for cognitive radio application is presented.
In this paper, a novel frequency reconfigurable eshaped patch antenna frespa design is presented as a new wide band patch antenna for possible use in cognitive radio systems. In this paper, the design of wideband circularly polarized cp patch antennas for frequency reconfiguration in the physical layer of cognitive radios are studied and reported at xband frequencies. A compact size reconfigurable antenna for ultrawideband. Conference paper pdf available december 2009 with 152 reads. A survey on planar antenna designs for cognitive radio.
The proposed antenna is capable of switching between a wide operating band of 3. Cognitive radio paradigm and recent trends of antenna. In proceedings of the 8th european conference on antennas and propagation eucap 2014 pp. Aeu international journal of electronics and communications 102, 2534. A reconfigurable widebanddualband double cslot microstrip patch antenna is proposed. Index terms active patch,cognitive radio,feeding techniques, gain enhancement, impedance bandwidth, polarization, reconfigurable patch, ultrawide bands. The antenna consists of two symmetric slots that are fed by a forkshaped microstrip line. Wideband to concurrent triband frequency reconfigurable microstrip. Budimir 2 1wireless network and communication centre wncc, school of engineering and design, brunel university, west london, ub8 3ph, uk.
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