This paper presents an effective modeling methodology for Ultra-wideband (UWB) antennas. The methodology is based on augmenting an existing narrow-band model with a macro-model while simultaneously perturbing component values of the narrow-band model. The narrow-band model is an empirical-based circuit and the macro-model described by rational functions is determined using data fitting approach...

A stacked rectangular microstrip antenna with a shorting plate and a helical pin is proposed as a car antenna for triple band operation in ITS. The proposed antenna operates as a conventional stacked microstrip antenna at the highest frequency band. At the middle and the lowest frequency bands, the antenna radiates at low elevation angles from the helical pin and the shorting plate. In this pap...

The present work relates to the antenna design for mobile terminals. It’s about PIFA antennas (Planar InvertedFAntenna). The modification of the certain existing structures geometrical forms allowed the operation of those according to current standards. The design is performed by using the SuperNEC and HFSS simulators. The conception of four antennas: broadband, Bi-band, tri-band and quadriband...

In the HF band (3-30 MHz), the equipment used for transmission or for location finding, rely on the antenna system which can be very varied, using antenna diversity and/or space diversity. The roles of these antennas or antenna arrays are presented in this paper using a bi-vectorial model related to ionospheric links. This narrow band model includes propagation effects, transmitting and receivi...

Cylindrical near-field systems are appropriate measurement systems for large L-band RADAR antennas, because they can be measured on their azimuthal positioner, and the probe can be easily translated through a vertical linear slide. Thus, for large antennas, the mechanical aspects of the measurement systems are important and the errors in this mechanical part can affect to the far-field radiatio...

As part of an indoor multipath measurement system, discone antennas featuring simple N-connector feed systems have been fabricated for the . . 1.0 to 2.0 GHz band. Experimentation reveals that excellent performance (VSWR < 1.5 :1 across the band) can be obtained with a simple "snap-on" feed/mount method, and that VSWR is most sensitive to the diameter of the disc feed conductor. Performance dat...

We propose an alternative waveform scheme built on mutually-orthogonal complementary sets for a distributed multistatic radar. Our analysis and simulation show a reduced frequency band requirement for signal separation between antennas with centralized signal processing using the same carrier frequency. While the scheme can tolerate fluctuations of carrier frequencies and phases, range sidelobe...

A compact dual-band multiple-input-multiple-output (MIMO)/diversity antenna is proposed. This antenna is designed for 2.4/5.2/5.8GHz WLAN and 2.5/3.5/5.5 GHz WiMAX applications in portable mobile devices. It consists of two back-to-back monopole antennas connected with a T-shaped stub, where two rectangular slots are cut from the ground, which significantly reduces the mutual coupling between t...

In this paper, novel compact broadband dual frequency microstrip antennas are presented and broad-band impedance matching is proposed as a method for improve the matching level of antennas. The first proposed design consists of a rectangular microstrip antenna with a pair of parallel slots loaded close to the radiating edge of the patch and three meandering narrow slots embedded in the antenna ...