This paper describes an antenna system combining Global Navigation Satellite System (GNSS) with Iridium satellite communications and UHF 225-512 MHz communications on a handset to provide an integrated Communications Navigation (Comm/Nav) antenna. The GPS/GNSS/Iridium antenna is a folded Quadrifilar Helix Antenna (QHA) with novel features which improve frequency coverage compared to existing QH...

Development of small antennas for mobile phones has received a lot of attention during the last few years due to size reduction of the handsets, requirements to keep the amount of RF power absorbed by the user below standardized levels regardless of the handset size, and introduction of multimode phones. Single-band and dual-band phones in which the external whip or helix antenna has been repla...

This paper presents design procedure of a spatial fading emulator representing a Laplacian angular power spectrum of incoming wave applicable to the over-the-air (OTA) evaluation for a handset MIMO antenna. The emulator has a number of antenna probes located on a circle around a handset under tested. The radius of the circle arranging the antenna probes can be defined by the power ratio of wave...

A novel multiband multiple-input-multiple-output (MIMO) antenna system is proposed. The MIMO antenna system consists of two antenna elements, each of which comprises of three radiators: a driven monopole, an S-shaped strip and an inverted F-shaped strip and occupies footprint of 15x18.5x0.8 mm3 only. The driven monopole acts as a quarter-wave monopole and stimulate higher mode resonance. The tw...

Introduction: Short-circuited microstrip patch antennas, or PIFAs, can be used as directive internal handset antennas in various communication systems. They provide advantages over traditional external whip and helix antennas in terms of increased total efficiency (when the handset is near the user’s head), decreased radiation towards the user, and increased mechanical reliability. The main dis...

This paper presents effect of delay waves on MIMO over-the-air (OTA) throughput of a handset MIMO array using a spatial fading emulator. The emulator has a number of antenna probes located on a circle around a handset under test to representing a multipath radio environment applicable to the OTA evaluation for a handset MIMO antenna. The MIMO OTA tests with and without delay waves, which have a...

In the previous study [1], a built-in L-shaped folded monopole antenna (LFMA) has been proposed and its fundamental performances have been analyzed and compared with those of PIFA, taking application to the handset MIMO system into consideration. The LFMA has been found to have similar bandwidth (the relative bandwidth for VSWR≤2 was about 19% at the frequency of nearly 2GHz) and the physical v...

We are reporting investigations into the interference rejection capabilities of a dual antenna system on a mobile handset prototype for the 1800 MHz band. The performance evaluation is done by using a simulated incoming eld on the handset antennas and by downlink measurements in an indoor environment. Complex signal samples are used in order to investigate the interference rejection gain with d...