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- The self-complementary antenna (SCA) is a basic antenna for extremely broadband practical antennas.This antenna is an arbitrarily shaped antenna which is constituted with a half of an infinitely extended planar-sheet conductor such that the shape of its complementary structure is exactly identical, or "self-complementary" with that of the original structure with two terminals for the simplest case. The self-complementary antenna has constant input impedance independent of the source frequency and the shape of the structure. The type of the self-complementary antenna is not limited only to the case of a planar antenna with two terminals, but there are more general types with various grades of complexity, such as, the number of terminals, the number of reference planes, and others. Moreover, there is infinite freedom in their shapes of the structures. They also have constant-impedance property independent of the source frequency and the shape of the structure for respective classes of structures with various grades of complexity. This general principle of self-complementarity is also called the "Mushiake Principle" by various sources. Examples for two shapes of the structures are shown in the attached figures. The structures 1 to 3 are for square shape, and the structures 4 to 6 are spiral shape. Actually, the structures extend infinitely, but the figures show only finite portions near the feed point of each structure.
* Explanation of SCA structure 1
* Explanation of SCA structure.2
* Explanation of SCA structure.3
* Explanation of SCA structure.4
* Explanation of SCA structure.5
* Explanation of SCA structure.6 The equation which gives the constant value of the input impedance for self-complementary antenna is called the "Mushiake Relationship". The values of the constant-impedance for various classes of complexity in the self-complementary structures depend on the respective grades of the complexity. For example, the Mushiake relationship for the simplest self-complementary planar antenna with two terminals is expressed as: Z = Z0/2≒188.4 [Ω], (Mushiake relationship) where Z is the input impedance of the antenna, and Z0 is the intrinsic impedance of the medium. Moreover, experimental studies on self-complementary antennas, including radiation properties, are conducted in Japan. As the results of the experiment, it is found that the truncated alternate-leaves type self-complementary antenna (or Square SCA) has practically omnidirectional radiation pattern as well as the broadband property. (en)
- 自己補対アンテナ（じこほついアンテナ、英:Self-Complementary Antenna）は、広帯域にわたって機能する周波数特性を持つアンテナである。 1948年に東北大学在学中の虫明康人により原理が発見され、2017年にIEEEマイルストーンに認定された。 (ja)
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- 10024 (xsd:nonNegativeInteger)
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- 自己補対アンテナ（じこほついアンテナ、英:Self-Complementary Antenna）は、広帯域にわたって機能する周波数特性を持つアンテナである。 1948年に東北大学在学中の虫明康人により原理が発見され、2017年にIEEEマイルストーンに認定された。 (ja)
- The self-complementary antenna (SCA) is a basic antenna for extremely broadband practical antennas.This antenna is an arbitrarily shaped antenna which is constituted with a half of an infinitely extended planar-sheet conductor such that the shape of its complementary structure is exactly identical, or "self-complementary" with that of the original structure with two terminals for the simplest case. The self-complementary antenna has constant input impedance independent of the source frequency and the shape of the structure.
* Explanation of SCA structure 1
* Explanation of SCA structure.2
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* (en)
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- 自己補対アンテナ (ja)
- Self-complementary antenna (en)
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