By American Radio Relay League
Quench your thirst for brand new antenna designs, from Allen's Log Periodic Loop Array to Zavrel's Triband Triangle. find a 12-meter quad, a discone, modeling with MININEC and VHF/UHF ray tracing.
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Extra info for Antenna Compendium Volume 3
These networks do not use access points (infrastructure) to perform communication between stations. Therefore, there are no centralizing elements. Mobility and energy constraints are also characteristics of ad hoc network nodes. Nodes may be capable of movement and can be connected dynamically in an arbitrary manner [ROY 99]. Moreover, energy is typically a scarce resource, since a node is usually fed with batteries that would be difﬁcult to recharge or replace. The main advantages of ad hoc networks are great ﬂexibility, low cost and robustness.
The backbone routers must also be able to selforganize, which requires self-conﬁguration and self-healing. Depending on users’ organization and their participation within the network, the WMN can be further classiﬁed into three different global architectures: client, infrastructure and hybrid mesh: – Client mesh: users operate in the same way as in the ad hoc case, but they can form a temporary backbone so as to improve the overall network connectivity. Additionally, a given node can also provide Internet access to others.
2(a) illustrates the client mesh architecture. Note that the backbone is composed of client nodes acting as a wireless backbone. – Infrastructure mesh: unlike the client mesh, users do not participate in the backbone and, consequently, they do not collaborate with the network connectivity. Their participation is limited as consumers, which means that they neither have to forward data nor execute additional protocols. This is opposed to the client mesh, where users can be part of the backbone and, in this case, they have to run routing protocols.
Antenna Compendium Volume 3 by American Radio Relay League