antenna matching

antenna matching

[an′ten·ə ‚mach·iŋ]
(electromagnetism)
Process of adjusting impedances so that the impedance of an antenna equals the characteristic impedance of its transmission line.
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References in periodicals archive ?
This way, the antenna matching circuit can be easily obtained by configuring only the capacitance of the resonant circuit.
A module is a small board (sometimes as small as regular silicon size) that has silicon, antenna, antenna matching network, or an option to connect an external antenna, and other required components like crystals that are needed for module operation.
The second obstacle is the lack of a negative tunable inductor suitable for VLF receive antenna matching. Previous researchers have presented methods in ultrahigh frequency (UHF) [21, 22] and did not address the matching process between the antennas and the tunable NFCs.
Work includes replacement of helix coils which make up part of the antenna matching network, replacing of the pure water cooling loop systems and two grid variometers which are part of the transmitter, and even power supply replacement.
Antenna matching circuit was used to match antenna impedance with transmitter impedance.
This enhances the antenna matching. An N-type 50 [OMEGA] coaxial cable is used for the antenna excitation.
The worst outcome of this is the degradation of antenna matching. On the other hand, in short distance line-of-sight (LOS) applications that only require a limited angular range, an OD pattern are not optimal since most of the power radiates in unwanted directions.
The simulated results show poor antenna matching impedance's for the two last feeding inputs (Fig.
"The growth of MEMS business has always been linked to new applications of existing devices (more inertial devices in more mobile systems) and brand new devices (antenna matching finally on the market with MEMS technology, introduction of the first MEMS based micro fuel cells, Mirasol MEMS based display having its first volume application)," explains Jean-Christophe Eloy.
Fortunately, modern HF equipment such as the AN/PRC-150 are equipped with a very effective antenna matching unit that is quite capable of providing acceptable antenna electrical impedance matching even to very short antennas.
The dielectric loading has two significant effects: first, it reduces the size of the antenna and second, it improves the antenna matching bandwidth significantly.
Yet, it depends on a reflection coefficient ([S.sub.11]) threshold, below which antenna matching is regarded as achieved for practical purposes.

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