Results 321 to 330 of about 5,014,271 (379)

Frequency reconfigurable origami quadrifilar helical antenna with reconfigurable reflector

2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015
This paper presents a novel origami quadrifilar helical antenna (QHA) that can reconfigure its operating frequency between 2.07 GHz, 3 GHz and 4.45 GHz. An origami reflector was designed to enhance the gain of the QHA for all the operating frequencies. Typical simulated realized gains of this origami QHA with reconfigurable reflector are 15.13 dB at 2 ...
Xueli Liu, Shun Yao, Stavros V. Georgakopoulos   +2 more
openaire   +1 more source

A Multibit and Frequency-Reconfigurable Reflecting Surface for RIS Applications

IEEE Antennas and Wireless Propagation Letters
Intelligent reflecting surfaces, also known as reconfigurable intelligent surfaces (RISs), have currently received much attention for their applications in wireless communication.
F. Ahmed, T. Hassan, N. Melouki, H. Naseri, P. Pourmohammadi, A. Iqbal, T. Denidni   +6 more
semanticscholar   +1 more source

Pentagon slot resonator frequency reconfigurable antenna for wideband reconfiguration

AEU - International Journal of Electronics and Communications, 2015
Abstract With the advances in the field of communication and the current state of affairs in the development of antennas the need of compact multiband, multifunctional and cost effective antenna is increased. The study of reconfigurable antennas has made great progress in recent years.
Deepali K. Borakhade, S.B. Pokle
openaire   +1 more source

Reconfigurable infrared frequency selective surfaces

IEEE Antennas and Propagation Society Symposium, 2004., 2004
In this paper, a new reconfigurable frequency selective surface (RFSS) design concept is introduced. A grid of simple metallic patches interconnected by a matrix of switches is proposed as the unit cell of an RFSS. The switches are independently addressable and provide significant transmission and reflection flexibility over a large range of ...
J.A. Bossard, D.H. Werner, T.S. Mayer, R.P. Drupp   +3 more
openaire   +1 more source

Frequency-Reconfigurable Pixel Slot Antenna

IEEE Transactions on Antennas and Propagation, 2012
A new frequency-reconfigurable antenna structure which we denote as a pixel slot antenna is proposed and studied in this communication. The antenna makes use of a canonical switched slot element that is concatenated together to form various radiating structures.
Chiu, Frankie Chi Yuk, Li, Jichao, Song, Sichao, Murch, Ross David   +3 more
openaire   +2 more sources

Frequency-Reconfigurable Quasi-Yagi Antenna

2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2018
In this Paper, a Quasi-Yagi antenna for frequency reconfigurability is presented. The antenna is composed of a double-layer metallic structure and fed by a microstrip fed line. Two PIN diode switches are introduced in the driven element to control its length, resulting in shifting the resonance frequency into different regions electronically.
Abdurahman A. Hmouda, Tayeb. A. Denidni
openaire   +1 more source

Frequency reconfigurable circular patch antenna

2013 IEEE International RF and Microwave Conference (RFM), 2013
In this paper, a frequency reconfigurable circular patch antenna is presented. The proposed antenna is consisted of a radiating circular patch with a slot underneath the circular patch. Three switches are positioned in the slot thus produces six reconfigurable frequency bands. At the higher frequencies, directional radiation patterns are produced while
H. A. Majid, M. K. A. Rahim, M. R. Hamid, M. F. Ismail   +3 more
openaire   +1 more source

Macro-micro frequency reconfigurable antenna

2007 IEEE Antennas and Propagation Society International Symposium, 2007
In this paper, two representing diodes, the PIN diode and the varactor, are used for the Macro-micro frequency tuning. The PIN diode in the antenna is used for switching wireless service bands (Macro-tuning). As well as the varactor in the antenna is used for tuning frequency band to obtain the constant antenna gain (micro-tuning). The proposed antenna
null Chang won Jung, null Yong jin Kim, null Ilkyu Kim, null Young eil Kim   +3 more
openaire   +1 more source

A frequency reconfigurable slot antenna

2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007
This paper proposed a frequency reconfigurable CPW center-fed slot antenna. Four pin-diodes are utilized to switch the length of the slot. By tuning the different pairs of diodes on or off, three resonant frequency bands can be obtained. The simulated and measured results validate this concept.
Yibo Chen, Xufeng Liu, Yongchang Jiao, Fushun Zhang   +3 more
openaire   +1 more source

Frequency reconfigurable annular slot antenna

2007 IEEE Antennas and Propagation Society International Symposium, 2007
The design, microfabrication, and characterization of a multifunctional reconfigurable antenna (MRA), so called MRA annular slot, capable of changing its operating frequency are presented. Frequency reconfigurability is achieved through microelectromechanical systems (MEMS) actuators strategically located within the antenna architecture.
B A. Cetiner, Q. Xu, L. Jofre
openaire   +1 more source