A novel miniaturized design of a multiple slotted antenna is designed and simulation results are presented in this paper. The proposed antenna uses I, Uand inverted L-shaped slots in the radiation patch. The resonance frequencies can be controlled by adjusting the dimensions of the slots. The proposed antenna can meet the demand of WLAN, HIPERLAN/2 and radar applications. The key parameters lik...

considering a) that radar systems can produce interference to digital radio-relay systems (DRRS), which gives rise to regular bursts of errors related to the operational characteristics of the radar e.g. the radar antenna rotation rate; b) that the importance of radar systems is recognized worldwide, but that nevertheless efforts should be made to reduce the levels of spurious emissions from su...

A Microstrip Conformal Hexagonal Slot Patch Antenna fed by 50Ω microstrip line for various applications is presented in this paper. The strip loaded proposed antenna is fed through microstrip line to achieve proper impedance matching. Simulated results on High Frequency Structure Simulator software version 13 (HFSS 13) and CST10 are compared for FR4 – epoxiy substrate at different central angle...

1. Abstract: In mobile communications in urban area, it is a significant problem that blind spots of in the narrow street are caused by high buildings. In our previous works, a reflectarray antenna was developed to solve the problem [1]. However, the gain of reflectarray becomes very low when a very broad scattering angle is required. In this research, a new dual-antenna system is proposed, inc...

This paper describes the development of a circularly polarized microstrip antenna, as a part of the Circularly Polarized Synthetic Aperture Radar (CP-SAR) sensor which is currently under developed at the Microwave Remote Sensing Laboratory (MRSL) in Chiba University. CP-SAR is a new type of sensor developed for the purpose of remote sensing. With this sensor, lower-noise data/image will be obta...

Software defined radar (SDR) is a multi-purpose radar system where most of the hardware processing is performed by software. This paper introduces a concept and technology trends of software defined radar, and addresses the advantages and limitations of the current SDR radar systems. For the advanced SDR concept, the KAU SDR Model (KSM) is presented for the multimode and multiband radar system ...

In radars employing an electronically scanned antenna, the direction of the electromagnetic beam can be changed instantaneously, without being constrained to a mechanical motion of the antenna. The traditional revolving or repeating measurement patterns can be relaxed, leading to greater flexibility. It is assumed that the performance of the radar system can be improved by exploring this flexib...

A radar NDE (nondestructive evaluation) technique using an airborne antenna operating in the far-field condition is developed for detecting damages such as delamination and concrete cracking in GFRP (glass fiber reinforced polymer)-wrapped concrete columns. The far-field airborne radar (FAR) NDE technique is advantageous for distant measurement of bridge columns in practical applications. Far-f...

There are many proposals for multi-channel radar, emanating from the conventional monostatic radar system where transmitter and receiver are collocated. Collocation makes it easy for transmitter and receiver to share a common stable clock (local oscillator), which is required for both range and Doppler measurements. Signal processing for multi-static radars (see [1]) with widely dispersed anten...

Spectrum sharing between cellular and radar systems is an emerging area of research. Deploying commercial wireless communication services in radar bands give wireless operators the much needed additional spectrum to meet the growing bandwidth demands. However, to enable spectrum sharing between these two fundamentally different systems interference concerns must be addressed. In order to assess...