A self-complementary antenna composed of unipole and notch antennas

Improvement of bandwidth characteristics of low-profile superdirective antenna composed of asymmetric dipole element backed by planar reflector

“…Previously proposed antenna by the authors consists of thin monopole antenna mounded on the alternative asymmetric planar monopole part which was referred to as a ground plane simply [3]. Therefore, a notch structure can easily be implemented in the ground plane, and is considered to improve the bandwidth due to its self-complementary structure [4]. A 60 Ω resistor is also connected between the notch and the monopole element in order to obtain a constant impedance as shown in Fig.…”

“…This antenna exhibits both the superdirectivity and unidirectional property, however, the operating bandwidth was relatively narrow. This paper investigates the bandwidth enhancement technique by incorporating both the self-complementary structure [4] and the T-type monopole element into the original antenna. This T-type element is only used for impedance matching with the notch element on the planar asymmetric monopole part, and is fundamentally different from other T-type dipole and/or monopole antenna on the ground plane [5,6].…”

Quasi Self-Complementary Uwb Notched Microstrip Antenna for Usb Application

“…The selfcomplementary antenna is well known for its extremely broadband characteristics. As a matter of fact, the idea of the self-complementary antenna was obtained in the process of the developmental studies for the Yagi-Uda antenna [1], by Mushiake [2][3][4]. The impedance of the load is the characteristic impedance Z o /2 (= 60 Ω), where Z o is the free space intrinsic impedance.…”

Electromagnetically coupled inverted-FL antenna with self-complementary structure

“…Generally, a self-complementary antenna needs an infinite structure in order to achieve a constant impedance of 60 7r ohms regardless of frequency. An axial symmetry type antenna with a finite structure achieves constant impedance if a matching load of Zo/2 (Zo == 120 7r ohms, where Zo is the impedance of free space) is attached at the feed point [5] [6]. However, approximately half the power is lost at the matching load.…”