Abstract
This paper presents a compact and planar reconfigurable filtenna for application in Wireless systems. The filtenna is composed of a UWB circular antenna and a filter with two trapezoidal resonators. The filter is integrated on the antenna feed line and has a band-pass frequency response. The filtenna frequency response reconfiguration is achieved by changing the capacitance of a varactor diode, placed between filter resonators; the capacitance varies continuously from 1.32 pF to 4.09 pF according to an applied bias voltage. The varactor capacitance analog variation defines the filtenna frequency of operation, which can be varied from 2.2 GHz to 3.4 GHz with an average bandwidth of 200 MHz, while maintaining the radiation characteristics of the UWB antenna. Simulated and measured filtenna results are shown according to varactor diode bias, demonstrating multiband operation using a compact planar design.
Highlights
Wireless communication systems are increasingly present in the day-to-day of human society due to the increased development of versatile devices with the most varied types of applications [1]-[2].Some of these devices, such as mobile phones and GPS, can operate on a variety of wireless communication protocols such as WiFi, WiMAX, WLAN, Bluetooth, GSM, and others [3].Current wireless systems require low cost, compact and lightweight features suitable for user portability
The development of antennas capable of working optimally, ensuring the versatility of these systems such as multiband operation, is an important requirement to meet the current needs of wireless communication systems [4]
Fig. 32. 2D radiation pattern for antenna and filtenna at 3.25 GHz. This manuscript presents a device known as filtenna that consists of the association between a circular planar monopole antenna with a trapezoidal geometry filter capable of reconfiguring its operating frequency
Summary
Wireless communication systems are increasingly present in the day-to-day of human society due to the increased development of versatile devices with the most varied types of applications [1]-[2]. The first references found in the literature about filtennas date back to 2002 These works already integrated filters and antennas in a single module [6]-[11]. Through diode states (ON and OFF) the design presented a broadband operation, where the frequency of 5.25 GHz or 5.8 GHz can be rejected according to PIN diode bias. This integration presented good results, with attenuation of about 30 dB. The reconfiguration of the filter is performed through a varactor diode, whose capacitance is varied depending on the reverse voltage applied, the frequency tuning is in the range from 2.2 GHz to 3.4 GHz
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