Broadband dual planar inverted F-antenna for wireless local area networks/worldwide interoperability for microwave access and lower-band ultra wideband wireless applications

An extension of the planar inverted F-antenna (PIFA) concept is proposed, combining two such antennas (one of them fed parasitically) to extend the usable bandwidth to cover the WiFi wireless local area network, worldwide interoperability for microwave access and lower-band ultra wideband spectra. The broad impedance bandwidth is achieved by combining a driven slotted PIFA, having bandwidth-enhanced rectangular strip feed, with a parasitic inverted F-shaped element, hence describable as a dual PIFA. The geometry parameters of these two radiators are selected to enhance the impedance bandwidth and hence to encompass the entire required set of operating frequency bands. The overall optimised dimensions of the antenna are 30 mm × 15 mm × 8 mm, thus making it compatible with installation on portable wireless electronic devices. The results show that the proposed antenna can achieve a gain between 2.0 and 4.0 dBi across the entire impedance bandwidth 2.4-6.2 GHz (i.e. 88.4% relative bandwidth) for a reflection coefficient of |S 11 | , 210 dB. The radiation patterns of the antenna show low-gain broad-beam coverage, as is essential for a wireless electronic device. Computed and experimental results are compared and are shown to be in satisfactory agreement

Ultra-wideband planar inverted FF antenna

A novel, miniaturised, planar inverted FF antenna (PIFFA) assembly is presented. The antenna design electromagnetically couples two PIFA antennas on an air substrate, and employs a broadband rectangular plate feeding mechanism to achieve an ultra-wideband characteristic. The dimensions of the complete prototype assembly are 30 × 15 × 8 mm. Good agreement is obtained between computed and measured impedance bandwidths over the range 3.1-10.6 GHz for |S ₁₁ |<-10 dB. The simulated and measured gain and radiation patterns are given also, to fully describe the antenna performance

Design of a PIFA with Parasitic F-element miniaturised antenna assembly for Lower Band Ultra-wideband and IEEE 802.11a applications

In this article, a planar inverted‐FF antenna with suspended rectangular feeding mechanism is presented for lower band ultra‐wideband and IEEE 802.11a wireless local area network applications. By manipulating the optimum strong electromagnetic coupling distance between driven and parasitic F‐shaped radiators on a small ground plane, two closely separate resonances can be merged to form a wide impedance bandwidth of 73.7% (3.0–6.5 GHz) at |S11| < −10 dB. The overall occupied antenna volume is 30 × 15 × 3 mm3 to satisfy the size requirement of modern wireless devices. The impact of the different antenna geometry parameters on the antenna performance is studied. The corresponding measured radiation patterns, gains and group delays are given to fully characterize the performance of this antenn