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Mohsen Koohestani

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This study reports an experimental study of the system fidelity factor (SFF) of ultra-wideband wireless body area network antennas in an on-body environment. This study also investigates the influence in the SFF because of the antenna polarisation with res ...

Inst Engineering Technology-Iet2015

This paper presents an experimental investigation of diversity gain influenced by polarization and spatial diversity techniques in ultrawideband (UWB) radio technology. To this aim, two different coplanar-fed UWB diversity antennas having the same size and ...

2015

Human Body Proximity Effects on Ultra-Wideband Antennas

Mohsen Koohestani

Body-centric applications include wearable communication systems that can be integrated in many different applications, as for instance in military, security forces, sport, fashion, or medical. In the latter, the quality of life of patients can be greatly ...

EPFL2014

A novel compact CPW-fed polarization diversity ultrawideband antenna

Anja Skrivervik, Mohsen Koohestani

A new compact coplanar-fed antenna suitable for polarization diversity in ultra-wideband applications is presented. The antenna consists of two identical monopoles which are printed on a low-loss substrate with 3 mm spacing and positioned perpendicular to ...

Institute of Electrical and Electronics Engineers2014

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This paper proposes a novel, low-profile UWB antenna for wireless body area network (WBAN) applications. The antenna has a polarization perpendicular to the body-free-space interface, which is interesting in order to minimize the coupling into the body. It ...

Institute of Electrical and Electronics Engineers2014

Feeding structure influence on performance of two UWB antennas near a human arm

Anja Skrivervik, Mohsen Koohestani

This paper reports a study of the feeding structure influence on impedance matching and system fidelity factor of two loaded UWB antennas when placed near a human arm. To this aim, two identical dielectric loaded versions of the same UWB antenna designs wi ...

2014

Since its introduction the fidelity concept has been used to evaluate the time behavior of UWB antennas. However, fidelity has been employed with different meanings. This paper clarifies the differences between fidelity factor, system fidelity factor, and ...

2014

Time-domain performance of a patch-loaded band-reject UWB antenna

Anja Skrivervik, Nuno Miguel Faria Pires, Mohsen Koohestani

A previous study of a novel technique to design a band-reject UWB monopole antenna by using patch loading is extended. Frequency-domain measurements have confirmed that the antenna designed using this technique rejects the interfering signal at the two int ...

Institution of Engineering and Technology2013

Performance study of a UWB antenna in proximity to a human arm

Anja Skrivervik, Nuno Miguel Faria Pires, Mohsen Koohestani

This letter studies the frequency- and time-domain performance of a recently developed printed coplanar-fed ultrawideband (UWB) monopole antenna aiming at predicting its behavior close to a human arm. The input reflection coefficient (|S11|) and fidelity f ...

Institute of Electrical and Electronics Engineers2013

Bandwidth enhancement of a wearable UWB antenna near a human arm

Anja Skrivervik, Nuno Miguel Faria Pires, Mohsen Koohestani

A dielectric sandwich loading technique is proposed to enhance impedance matching bandwidth of an antenna when it is placed close to the human body. This technique mitigates the body influence by confining the reactive fields in the dielectric loads. This ...

Wiley-Blackwell2013