Measured vehicular antenna performance

Jesch, R L.

doi:10.1109/t-vt.1985.24042

Cited by 13 publications

(11 citation statements)

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“…Prior work in the 900Mhz spectrum [5], shows that antenna placement affects antenna pattern distortion, that the top-center position on the roof provides nearomnidirectional coverage, and that signal attenuation up to 10dB can occur inside vehicles [18]. For 2 GHz, nonuniform beam patterns for roof-mounted omnidirectional antennas are reported in [4] due to the potential creation of a local multi-path environment on the vehicle's roof.…”

Section: Background and Related Workmentioning

confidence: 99%

“…These measurements were conducted with a single antenna mounting position and the simulation models based on these measurements all assume omnidirectional propagation from each vehicle. Other prior work in the antenna design community has shown, however, that for the 900Mhz and 2 GHz band [4], [5], [6] achieving omnidirectional propagation with roof-mounted antennas is a non-trivial task. Moreover, these studies show that results vary with the frequency band-thus, it remains unclear how Dedicated Short Range Communications in the 5GHz band is affected by antenna placement.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Antenna Placement and Diversity on Vehicular Network Communications

Kaul

Ramachandran

Shankar

et al. 2007

2007 4th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks

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Abstract-In this paper we present empirical results from a study examining the effects of antenna diversity and placement on vehicle-to-vehicle link performance in vehicular ad hoc networks. The experiments use roofand in-vehicle mounted omni-directional antennas and IEEE 802.11a radios operating in the 5GHz band, which is of interest for planned inter-vehicular communication standards. Our main findings are two-fold. First, we show that radio reception performance is sensitive to antenna placement in the 5Ghz band. Second, our results show that, surprisingly, a packet level selection diversity scheme using multiple antennas and radios, Multi-Radio Packet Selection (MRPS), improves performance not only in a fading channel but also in line-of-sight conditions. This is due to propagation being affected by car geometry, leading to the highly non-uniform antenna patterns. These patterns are very sensitive to the exact antenna position on the roof, for example at a transmit power of 40mW the line-of-sight communication range varied between 50 and 250m depending on the orientation of the cars. These findings have implications for vehicular MAC protocol design. Protocols may have to cope with an increased number of hidden nodes due to the directional antenna patterns. However, car makers can reduce these effects through careful antenna placement and diversity.

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Section: Background and Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Antenna Placement and Diversity on Vehicular Network Communications

Kaul

Ramachandran

Shankar

et al. 2007

2007 4th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks

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“…Although the measured resonant frequency is slightly shifted toward the lower frequency band by about 5 MHz, it still shows a similar trend compared to the simulation. To examine the omni- directional properties of the antenna, radiation patterns were measured in a semi-anechoic chamber at 433 MHz, as shown in Figure 4 (b) (Jesch, 1985;Joseph, 2010). The measured data show an average azimuth gain of -17.4 dBi with the minimum value of -42.9 dBi at f = 170 o .…”

Section: Introductionmentioning

confidence: 99%

Optimization of the mounting position and angle for RKE antennas

Lee

Byun

Choo

2015

Int.J Automot. Technol.

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This paper proposes optimization of a mounting position and angle for vehicle RKE antennas. To take into consideration the platform effect that degrades the radiation characteristic of the antenna, both interior and exterior vehicle structures are re-modeled as piece-wise mesh elements in a full-wave electromagnetic (EM) simulator. The optimum placement is found by evaluating radiation characteristics for all possible placements, and its average gain is improved by 4.7 dB, while the minimum gain is increased by 8.4 dB, compared to the conventional placement. The results demonstrate that the proposed method is suitable for maximizing the reading distance of the antenna by minimizing the platform effect.

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“…To the authors knowledge, there is no published data available that quantifies the effect of roof curvature, roof racks or a glass roof on the antenna performance at the vehicular frequencies of 5.9 GHz. In [1], [2], [3] only investigations on antenna placement for broadcast services in the resonant region, where the dimensions of the car are in the order of the wavelength, or for communication applications below 1 GHz, where a typical car has the dimension of 15 to 20 wavelength, were publisched. The publications [4], [5], [6] deal with the placement of Car2Car antennas concentrating only on the general placement like roof, mirrors or underneath the car and its influence on the communication channel.…”

Section: Introductionmentioning

confidence: 99%

Influence of car panorama glass roofs on Car2Car communication (poster)

Kwoczek

Raida

Láčík

et al. 2011

2011 IEEE Vehicular Networking Conference (VNC)

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The Car2Car communication will use a reserved frequency band at 5.9 GHz. One of the key requirements for a Car2Car antenna is that the gain is concentrated in the horizontal plane, which is a problem due to the limited ground plane of a car roof. The influence of roof curvature, roof racks and panorama glass roofs were investigated to quantify them. To the authors knowledge such measurements have not been published yet. Three different antennas were simulated and measured on round ground planes and real car roofs in different configurations. The configuration with a panorama glass roof showed an unexpected high loss of gain in the direction of the glass roof in the range of 15 to 20 dB which result in a drastically reduced communication range to the front direction. This phenomenon is still under investigation.

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Measured vehicular antenna performance

Cited by 13 publications

References 1 publication

Effect of Antenna Placement and Diversity on Vehicular Network Communications

Effect of Antenna Placement and Diversity on Vehicular Network Communications

Optimization of the mounting position and angle for RKE antennas

Influence of car panorama glass roofs on Car2Car communication (poster)

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