Compact dual‐band implantable planar inverted‐F antenna with bandwidth enhancement

Abstract

In this paper, a miniaturized planar inverted‐F antenna (PIFA) with a volume of 49.5 mm3 is proposed for biomedical implantable devices, operating in Medical Implant Communications Service (MICS, 402‐405 MHz) band and Industrial, Scientific, and Medical (ISM, 2.40‐2.48 GHz) band. It has a wide operating bandwidth in MICS band. The initial PIFA is designed with dual‐band performance, where the lower band is formed by quarter‐guided‐wavelength resonance and the higher band is formed by two‐guided‐wavelength resonance. Furthermore, by etching open‐slots between short and feed on the ground, a new resonance is introduced and moved towards the fundamental one, expanding the bandwidth in MICS band. Also, the introduction of slots lowers the initial resonant frequency in higher band, meeting the frequency demands of ISM band. Finally, the proposed antenna is measured in pork as well as skin‐mimicking gels, showing a bandwidth of 50.7% and 38% in MICS band, and 13.9% and 6.9% in ISM band.

Small Triple-Band Meandered PIFA for Brain-Implantable Biotelemetric Systems: Development and Testing in a Liquid Phantom

“…When implanted at a depth of 3 mm in the scalp, it provided the gain values of −30.5, −22.6, and −18.2 dBi, respectively. A similar approach, based on a spiral-shaped radiator and slotted ground plane, was used by Shang et al [23] to create a bandwidth-enhanced dual-band PIFA that was subcutaneously implanted at a depth of 3 mm. e antenna achieved the fractional bandwidths of 38% and 6.9% and gain values of −38.8 dBi and -18.6 dBi at 402 MHz and 2.45 GHz, respectively.…”

Design and performance analysis of a CPW‐fed circularly polarized implantable antenna for 2.45 GHz ISM band

“…Antenna performance is compared with the existing antenna structures in Table 3. As compared to other antennas proposed structure is implanted at maximum depth of 7 mm, possess smallest volume except, 8 which is linear polarized, have low bandwidh and gain. Designed structure has highest gain of −15.96 dB with compact volume of 98mm 3 exccept 14 .…”

“…Thus, larger bandwidth is important feature of implantable antenna 7 . PIFA with Π‐shaped radiator, 8 PIFA with open end slot, 9 slotted radiator loaded with metamaterial 10 and adding of double split ring resonators at the ground plane 11 are recently used methods to achieve broader bandwidth. 57% impedance bandwidth is achieved at 2.45 GHz ISM band 10 .…”

Next-Generation Healthcare: Enabling Technologies for Emerging Bioelectromagnetics Applications

“…In contrast to the Planar Inverted-F Antenna (PIFA) [53], the antenna [52] does not include a shorting pin and thus is not a PIFA. The sizes of the antennas [52] and [53] are 7⨯6.5⨯0.377 mm 3 In the works [54] and [55], the authors have focused on improving the impedance bandwidth of dual-band PIFA. This was realized by using spiraled radiators divided into two branches relative to the feed point.…”