Title:
入力インピーダンスに対してマッチングされる小型アンテナを設計する方法及びその方法によって設計された小型アンテナ
Document Type and Number:
Japanese Patent JP2004527974
Kind Code:
A
Abstract:
A method for designing a high performance, small antenna that is matched to a required output impedance, does not require filtering, is simple and inexpensive to manufacture, and is easily integrable with an RF power amplifier- with minimum cost, minimum external components and minimum energy losses. The method includes finding a singular point ( 102 ) in the impedance vs. antenna geometrical dimension/wavelength ratio graph, the singular point ( 102 ) exhibiting a high very high positive reactance, setting the antenna geometry to match this point, and canceling the very high positive reactance (high inductance) resulting from this match by adding to the antenna a very small capacitance, preferably provided by at least one gap capacitor ( 202 ) The antenna is preferably a loop antenna ( 200 ), and both the antenna and the gap capacitor ( 202 ) ( 204 ) are preferably implemented by printing methods on printed circuit board or ceramic substrates. The antenna ( 200 ) may also be implemented in non-differential designs.
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Inventors:
Shamir Addy
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Gadget mail
Application Number:
JP2002592230A
Publication Date:
September 09, 2004
Filing Date:
October 09, 2001
Export Citation:
Assignee:
RF Waves Limited
International Classes:
H01Q1/36; H01Q1/38; H01Q7/00; (IPC1-7): H01Q7/00
Attorney, Agent or Firm:
Hitoshi Suzuki