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Audio Broadcasting Antennas
Published in Victor Rabinovich, Nikolai Alexandrov, Basim Alkhateeb, Automotive Antenna Design and Applications, 2010
Victor Rabinovich, Nikolai Alexandrov, Basim Alkhateeb
A reconfigurable antenna is capable of dynamic (electronic or mechanical) modification of the radiation pattern. Figure 4.31 shows two reconfigurable printed-on-glass options in the FM frequency band that can be used in a space diversity system. Both designs use an electronic control switch (for example, a pin diode) for reconfiguring the antenna pattern to eventually achieve a single feeding point. In the first design, the open pin diode position corresponds to the antenna pattern with the horizontal portion, and the short pin diode corresponds to the antenna with horizontal and vertical portions. The pin diode can be mounted in a case with the main diversity circuit. The second design [21] is based on a parasitic element that changes the antenna directionality when the pin diode is on or off.
Special Techniques of Printed Antenna
Published in Binod Kumar Kanaujia, Surendra Kumar Gupta, Jugul Kishor, Deepak Gangwar, Printed Antennas, 2020
Dinesh Kumar Singh, Ganga Prasad Pandey
A reconfigurable antenna is useful in the changing the operating requirements to maximize the antenna performance due to its reconfigurable capabilities. The reconfigurable antenna has a capability to modify its frequency, polarization, and radiation properties in a controlled and reversible manner. Reconfigurable behavior can be obtained by modifying the antenna structure using different mechanisms such as PIN diodes, varactors, RF switches, and tunable materials. These mechanisms enable the intentional redistribution of the surface currents producing reversible modifications of the antenna properties. The reconfigurable antenna is useful in applications where multiple antennas are required. Multiple antennas can be replaced by a single reconfigurable antenna.
Reconfigurable UWB Antennas Design
Published in Chinmoy Saha, Jawad Y. Siddiqui, Yahia M.M. Antar, Multifunctional Ultrawideband Antennas, 2019
Chinmoy Saha, Jawad Y. Siddiqui, Yahia M.M. Antar
The term “reconfigurable” indicates the capability of an entity or a system to manifest itself in various shapes, configurations, or modes based on the changes in the environment in which the system works. The same concept is applicable to reconfigurable antennas which are capable of changing some of their impedance (S11) or radiation characteristics (pattern, polarization, etc.) so that they can be operated for wireless applications. In a reconfigurable antenna, reconfiguration is achieved by various kinds of switching and/or tuning elements or by physical alternation of the radiating aperture or by using smart materials such as ferrites and liquid crystals [1].
Design and fabrication of reconfigurable, broadband and high gain complementary split-ring resonator microstrip-based radiating structure for 5G and WiMAX applications
Published in Waves in Random and Complex Media, 2022
Shobhit K. Patel, Sunil P. Lavadiya, Juveriya Parmar, Kawsar Ahmed, Sofyan A. Taya, Sudipta Das
There are several sorts of antenna reconfiguration procedures. They are primarily physical shape-changing (mechanical)[19], electrically (PIN diodes, RF-MEMS, varactors) [20,21], optical, and material-based. Materials used in reconfiguration procedures might be solids, liquid crystals, or liquids (dielectric liquid or liquid metal) [22]. Reconfigurable antennas are categorized based on the dynamically modified antenna parameter, often the frequency of operation, radiation pattern, or polarization [23]. Antennas with frequency reconfigurable antennas can dynamically change their frequency. A reconfigurable antenna may be used to replace several antennas in circumstances when various communication networks are converging. Frequency reconfiguration is often performed by modifying the antenna size, such as RF switches, impedance loading, and tunable materials [21].
Multi-band frequency reconfigurable antenna using EBG and parasitic patches
Published in Electromagnetics, 2022
Rahul Tiwari, Ashish Bagwari, Vivek Singh Kushwah
In the future scenario of the wireless communication systems, it requires a single antenna with compact size, large bandwidth, and multi-band characteristics. Thus, reconfigurable antenna techniques have been highly demanded to fulfill the need for different wireless applications, such as C band, WiMAX band, wireless local-area network (WLAN) band, X band, Bluetooth, and many others. The reconfigurable structure provides various advantages like compact size, supports many wireless applications simultaneously with multi-functionality, and is less expensive. Moreover, a reconfigurable antenna can switch its operating frequency, radiation characteristics, and “polarization.” The reconfigurability of an antenna can alter the operational antenna frequency, which can perform as a filter to evade unwanted signals. The first-time idea of reconfigurability existed in early 1930 (Haupt and Lanagan 2013). However, since 1999, it got a practical demonstration for various wireless applications. In recent years, advanced wireless devices like the “cognitive radio system” have motivated researchers to design reconfigurable antenna systems to fulfill the desired demands (Mirzamohammadi, Nourinia, and Ghobadi 2012).
Design of Reconfigurable Antenna Using MSF-EBG Structure to Improve Performance Parameters
Published in IETE Journal of Research, 2022
Manasi Shrikant Kanitkar, Shankar Baburao Deosarkar
A reconfigurable antenna is an antenna which is capable of modifying dynamically its frequency and radiation properties in a controlled and reversible manner and can also be structurally reconfigured to operate at different frequency bands. In order to provide a dynamical response, reconfigurable antennas integrate an inner mechanism (RF switches, varactors, mechanical actuators or tunable materials) that enable the intentional redistribution of the RF currents over the antenna surface and produce reversible modifications over its properties. Reconfigurable antennas differ from smart antennas because the reconfiguration mechanism lies inside the antenna rather than in an external beam forming network. The reconfiguration capability of reconfigurable antennas is used to maximize the antenna performance in a changing scenario or to satisfy changing operating requirements. Thus one antenna can be used for several applications, which saves space, weight, and money. The distinguishing feature of a reconfigurable antenna is that it can alter the RF current distribution within a planar-radiating aperture. As opposed to a phased array, it can change its element pattern in addition to its complex array factor. Figure 6(a,b) shows an antenna using switch (p-i-n diode or RF-MEMS) to make it reconfigurable so that it can operate at two frequencies.