A procedure for the design of a novel small slot antenna is
presented. Using this method enables us to achieve a perfectly matched
antenna with a fairly high efficiency for a given arbitrary small size.
The miniaturization is achieved by terminating the short slot by an
inductor. Inductive loading is realized by coiling the shortened slot
line with a length of less than a quarter wavelength. Although the
choice of antenna size is optional, it is subject to limitations such as
antenna bandwidth and gain/efficiency. However, the directivity of this
small dipole-slot antenna, in the limit, is equal to that of the
infinitesimal Hertzian dipole, and its gain depends on the substrate
material specifications and antenna size. Microstrip line is used to
feed the antenna, which provides more stable feeding compared to coaxial
feed. Then simulation results for a prototype antenna at 300 MHz as well
as the input impedance and radiation pattern of the antenna are
presented and compared with measurements
[Show abstract][Hide abstract] ABSTRACT: The contents of this annual report consist of four parts. The first part, "design of dedicated short-range communication transceiver" summarizes the design of an RF transceiver, the second part, "3-bit vector-sum phase shifter using switched attenuator" summarizes the design of a phase shifter in steps of 45 degrees, the third part, "size-reduction of patch and meshed antenna using inductors" presents a miniaturized meshed antenna, the fourth part, "analysis of range detection system" presents a small range-detection system. All these four parts are designed at 2.5 GHz, and will be integrated in the next phase for demonstration. Abstract — In this part, a short-range communication system is designed in the 2.43 GHz ISM band. It includes LNA, mixer, and LO. The LO signal is stablized by an injection-locking oscillator. IF amplifiers and filters are designed to improve the IF signal quality. This hybrid circuit is implemented on FR4 PCB to verify its function.
[Show abstract][Hide abstract] ABSTRACT: In this paper, a patch antenna embedding circular spiral inductors is proposed. These inductors introduce additional phase to the current path and extend its equivalent electrical length. Measurement results indicate that the resonant frequencies of inductor-embedded antennas can be significantly reduced. The effect of different spiral inductor parameters on the resonant frequency is also studied. Measured radiation patterns are close to those of conventional microstrip antennas.
[Show abstract][Hide abstract] ABSTRACT: In this paper two distinct methodologies in achieving miniaturized antennas for wireless applications are described. One method is based on defining novel topology of radiating elements that can easily be incorporated into monolithic circuits and the other method is based on embedding radiating structures within novel electromagnetic materials. Examples of extremely small planar antennas using both methods are demonstrated.
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