Florian Pivit

EISL, the Pendant to EIRP: A Measure for the Receive Performance of Base Stations at the Air Interface

This paper presents a new method to compare the receiving performance of different types of base stations (BS) in consideration of their architecture, the system noise and the antenna performance. The usual measure to indicate the transmitting performance and coverage of a BS is the equivalent isotropic radiated power (EIRP). On the receiving side, no such measure has so far been introduced. Active antennas with down tilt features, the received noise and noise, which is added at different locations in the signal path as well as varying RF-front-end-architectures make it difficult to compare the sensitivity of different base station architectures. Therefore a new measure will be introduced in this paper, the so-called equivalent isotropic sensitivity level (EISL). This measure makes it possible to compare different types of base station architectures in terms of their real sensitivity right at the air interface with respect to the system architecture and noise. Finally, EISL will be used to compare different base station concepts and to show the influence of the antenna down tilt on the effective usable sensitivity of a base station.

Broadband multimode antennas for MIMO applications

This paper presents compact broadband multimode antennas for MIMO and diversity applications. The antenna system is riot based on spatial diversity. as usual MIMO system, but on a combination of pattern and polarisation diversity. Different modes of self-complementary spiral antennas we used to decorrelate the signals. It is shown that only one antenna is necessary to receive three uncorrelated signals, thus the space required to place the MIMO antenna is very small.

A broadband, ship based, electronically steered L-band SATCOM antenna

In this paper an antenna for the L-band satellite communication system INMARSAT is presented. The INMARSAT System (Downlink: 1525-1559 MHz, Uplink: 1626.5-1660.5 MHz) was mainly build for voice and data communication between offshore ships and the mainland. Therefore these antennas have to have a steerable beam, so they can be pointed to the satellite regardless of the ships position on sea, as well as to compensate for the movement of the ship itself. So far the antennas for such systems have been steered mechanically. In this paper a new, cost effective and electronically steerable conformal array antenna for the INMARSAT system is presented.

Polarization coupling effects in a dual-polarized aperture antenna for multiband base stations

The paper shows that the proposed antenna covers multiple mobile communication frequency bands, it shows the stable performance of the antenna within these frequency bands and states the capability of its polarization diversity feature.

Microwave based wound healing detection

The paper describes two different approaches for the detection of wound healing. The state of curing of the wound shall be determined without taking off bandages or stickers. Furthermore the curing state in burried layers of tissue shall be supervised. All curing states have to be detected without direct contact to the injured person in order to avoid pain. One approach is to use a coaxial sensor for the low frequency range from 1 GHz to 20 GHz with its fringing fields to measure a complex reflection coefficient in the skin plane. The other approach measures also a complex reflexion signal but at millimetre wave frequencies (77 and 94 GHz), where the material losses have decreased compared to low frequencies. Based on these parameters, the curing status can be derived.

Wound diagnostics with microwaves.

The reflection of electromagnetic waves on material surfaces is very depending on the electric and magnetic properties of these materials, on their structure and on the surface texture. Therefore the different layers and dielectric properties of healthy and unsound body tissue also show different reflection behavior towards incidentating electromagnetic waves. By analyzing the reflected signals of incident electromagnetic waves, it is possible to get information about the inner structure of the reflecting body tissue. This effect could then be used for a contactless analysis of body tissue e.g. to gain crucial medical information about healing processes. In this paper the results of several full wave simulations of various tissue structures are presented and the significance and usability of this method is shown.