Frequency reconfigurable planar inverted‐F antenna using switchable radiator and capacitive load

Abstract

A frequency reconfigurable planar inverted‐F antenna (PIFA) using real PIN‐diodes is presented for mobile worldwide interoperability for microwave access (m‐WiMAX) applications. This antenna not only alters the frequency band of the m‐WiMAX using PIN‐diode switching, but it also has a small profile using capacitive load within an FR4 dielectric constant substrate. The PIFA consists of the following: a main radiator, an additional radiator, a band‐switchable capacitive load, two PIN‐diodes and control circuits. One diode is placed between the main and additional radiator on the top side, and the other is vertically attached between the capacitive load and ground. Depending upon whether the diodes are on or off, the antenna operates over 2.3–2.4, 2.5–2.7 and 3.4–3.6 GHz for worldwide m‐WiMAX bands. To investigate the effect of load capacitance, a parametric analysis is performed by sweeping the length and width of the capacitive load. All simulated and measured results for the proposed antenna are presented, and they show excellent agreement.

Dual band frequency tunable planar inverted‐F antenna for mobile handheld devices

“…In Reference , the multiband behavior attained using nested capacitive slots in the antenna structure. Other techniques have been proposed in References 8 to 13, frequency tuning can be achieved using pin diodes, capacitive load, varactor diode, and RF MEMS switch. In References , the capacitive tuning technique is very impressive for extending the frequency without increasing the physical size of the antenna.…”

“…Other techniques have been proposed in References 8 to 13, frequency tuning can be achieved using pin diodes, capacitive load, varactor diode, and RF MEMS switch. In References , the capacitive tuning technique is very impressive for extending the frequency without increasing the physical size of the antenna. In Reference , reconfigurable antennas are used to achieve the multiband operation in the mobile handset and provide better efficiency.…”

“…Finally, with the use of center frequency, the impedances, the length, and width of each quarter wavelength sections realized in the microstrip configuration are extracted and listed in Table 1. Also, from the above Equations (1) to (8) we will be able to evaluate the tuning range of the proposed PIFA.…”

Electrically and Frequency-Tunable Printed Inverted-F Antenna with a Perturbed Parasitic Element

“…It can be easily fabricated through modern printing technology and fitted into a limited space because of its low-profile structure. Another example is the frequency-tunable planar inverted-F antenna equipped with a capacitor [4][5][6][7] (see also [8]). The capacitor is located between the main radiator and a parasitic element to vary resonant frequencies, after which capacitance is modified.…”

Frequency Reconfigurable Monopole Antenna Using Switchable Slotted Triangular Radiators

“…Switchable antennas are a sort of multi-purpose antenna with just one antenna is capable of replace the resonant frequencies, radiation pattern or polarisation in real time without changing the complete antenna's structure. Likewise, a noteworthy issue in communication systems is to decrease the antenna size and bringing down its profile while allowing perfect performance over the bands [2]. Planar monopole antennas, because of their desirable traits for example, affordable, lowprofile, simplicity of manufacture, large bandwidth, and omnidirectional radiation pattern have got great attention for hand-held wireless applications [3].…”