Simulation of Proposed Miniaturized Reconfigurable Antenna for Wireless Communication

In recent years, there is a huge demand for reconfigurable antenna technique provides large bandwidth and wideband antennas to satisfy the increasing demands for wireless communication application. The frequency reconfiguration patch antennas that has extensively reduced the complexity in structure and thereby the antenna size. As frequency is inversely proportional to dimension of an antenna, the larger the length the smaller is the frequency of operation

A Tunable Microstrip Planar Antenna using Truncated Ground Plane for WiFi/LTE2500/WiMAX/5G/C, Ku, K-Band Wireless Applications

Reconfigurable antennas are key candidates for modern wireless communicating devices to perform multiple wireless operations on various frequencies. This paper is introducing a compact yet efficient design of frequency reconfigurable TX-Shaped monopole antenna with truncated ground plane. The substrate used is FR-4 having a height of 1.6mm. Optical reconfiguration technique enables proposed structure to tune to multiple resonant frequencies depending upon ON/OFF state of the switch. In switch ON state, antenna exhibit quad band characteristics in nature by operating at resonant frequencies ranging from (2282-2816MHz), (4525-5053MHz), (11946-14203MHz) and (16200-19180MHz). While in switch OFF state,proposed structure operates at triple bands having frequencies ranging from (2685MHz-3632MHz), (11985MHz-14234MHz) and (16014-19107MHz). VSWR is calculated less than 1.4 with efficiency ranging from 52.5% to 82.6%, while gain of antenna is calculated ranging (1.62dB-3.53dB). Proposed tunable TX-Shaped structure is able to serve wireless services that includes Wi-Fi (2400-2480MHz), LTE2500 (2500-2690MHz), WIMAX (3300-3800MHz), FCC allocated mid band for 5G (2500MHz/3500MHz) and Satellite Communication applications in IEEE bands that includes Cband (2000-4000MHz), Ku-band (12000-18000MHz) and K-band (18000MHz-27000MHz). Proposed frequency reconfigurable TX-Shaped antenna is low cost, low profile, lightweight and can be used in wireless devices i.e. IPADs, Mobile Phones, 5G device, Tablets, Wi-Fi routers etc. Design and evaluation of antennas’ parameters is observed and analyzed in CST Microwave Studio using Finite Integration Technique (FIT)

Reconfigurable filtennas for IoT applications and LEO satellites constellations

Nesta dissertação foram projetadas três filtenas reconfiguráveis na frequência. A designação de “filtenas” vem da junção da palavra “antena” com a palavra “filtro”. Estes foram integrados na rede de alimentação de todas as estruturas, que têm a capacidade de operar a 20 e 29GHz, sendo utilizado um díodo PIN para controlar esta comutação. Para o projeto das três filtenas, foi necessário um processo de aprendizagem, no qual se idealizaram outras estruturas cujas falhas e limitações permitiram aprimorar os três resultados finais. Entre estas, desenhou-se uma antena reconfigurável para as frequências mais baixas de 2.4 e 5GHz, sendo o seu processo de construção utilizado no desenvolvimento das estruturas definitivas. A segunda antena delineada, com capacidade de operar a 9, 12.5 e 16GHz, apresentava uma rede de alimentação de elevado custo, o que levou à colocação de filtros nos projetos seguintes. Este passo foi de elevada importância no processo de otimização final. Por último, simularam-se outras filtenas ressoantes a 20 e 29GHz. As suas limitações motivaram a procura de novas técnicas que permitiram aperfeiçoar os projetos das três antenas finais.In this dissertation three frequency reconfigurable filtennas are projected. The designation of “filtenna” comes from the junction of the word “antenna” with the word “filter”. These have been integrated into the feed network of all structures, having the capacity to operate at 20 and 29GHz. A PIN diode is used to control the switching. For the design of the three filtennas, a learning process was necessary. Other structures were created whose flaws and limitations provided the basis for improvements in the three final results. Among these, a reconfigurable antenna was designed for the lower frequencies of 2.4 and 5GHz with its construction process being used in the development of the definitive structures. The second outlined antenna, capable of operating at 9, 12.5 and 16GHz, had a high-cost feed network, which led to the placement of filters in the subsequent designs. This step was of great importance to the final optimization process. Finally, others filtennas resonant at 20 and 29GHz were simulated. Their limitations motivated the search for new techniques that allowed to perfect the designs of the three final antennas.Mestrado em Engenharia Eletrónica e Telecomunicaçõe