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Wideband bow-tie slot antenna with tuning stubs

Home > Vol. 49 > pp. CHARACTERISTICS OF BOW-TIE SLOT ANTENNA WITH TAPERED TUNING STUBS FOR WIDEBAND OPERATION By A. A. Eldek, A. Z. Elsherbeni, and C. E. Smith. In this paper, a modified slot bow-tie antenna fed by a coplanar waveguide (CPW) is investigated for wideband operation. It is designed to work on a thin s. Full-Text Paper (PDF): Wideband bow-tie slot antenna with tuning stubs.

This design is approximately 0. For full functionality of ResearchGate it is necessary to enable JavaScript. It is a two layered printed antenna with the feed line on the top surface of a dielectric substrate, while the radiating arms are on the bottom surface. A half bowtie antenna with embedded balun has been presented in [20] as a planar wideband dipole antenna. The end loading ultra-compact antenna presented in Ref. Different types of printed dipole antenna have been studied that they are easy to fabricate and have a simple structure [1][2][3][4]. Content uploaded by Wai Siang Yeoh.

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For full functionality of ResearchGate it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser. A linearly polarized miniaturized printed dipole antenna with novel half bowtie radiating arm is presented for wireless applications including the 2. This design is approximately 0. An integrated balun with inductive transitions is employed for wideband impedance matching without changing the geometry of radiating arms.

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The radiation patterns are largely omnidirectional and display a useful level of measured gain across the impedance bandwidth. The size and performance of the miniaturized half bowtie dipole antenna is compared with similar reduced size antennas with respect to their overall footprint, substrate dielectric constant, frequency of operation and impedance bandwidth. This half bowtie design in this communication outperforms the reference antennas in virtually all categories. Content uploaded by Wai Siang Yeoh.

Wideband miniaturized half bowtie printed dipole antenna with integrated balun for wireless applications. Sorry, there is no online preview for this file type. Balun has been used as key components in many kinds of circuits such as double balanced mixers, push-pull amplifiers, antennas, and frequency multipliers [1] - [7]. They can provide a balanced output converted from an unbalanced input.

The challenge of impedance matching in limited size RFID reader antennas is dealt with several design techniques: Other size reduction techniques are described in [5][6] [7]. Alternative antenna designs that ensures low-cost, reduced size, simple geometry, robustness against manufacturing errors and presents an omnidirectional radiation pattern are desired.

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Antennas List Antenna Theory Home. Bow-Tie antennas aren't really Log Periodic antennas ; however, the bow tie or butterfly antenna makes a good starting point to begin talking about Log-Periodic antennas.

So we will first discuss properties of wideband antennas, and then discuss the infinite bow-tie antenna, and then measurements and properties of the real bow-tie antenna. Wideband Antennas If you think about the Half-Wavelength Dipole Antenna , the antenna design is specified by the length - the length should be equal to a half-wavelength at the frequency of interest.

Now, this is fine for MHz - but what if you also want the antenna to radiate well at and MHz? Because at MHz the 0. If you think about that last paragraph for a while, you may note that one problem with the above Half-Wavelength antenna design is that the design depends solely on length, which will mean much different things in terms of wavelengths at different frequencies. What if instead, we could design an antenna that was completely specified by Angles instead of Lengths? Angles do not depend on distance - and hence don't depend on wavelength, so if we could design such an antenna it would be frequency independent.

The Bow-Tie Antenna As a simple and non-manufacturable infinitely wideband antenna, let's look at an infinite bow-tie antenna: Infinitely Long Bow-Tie Antenna. In Figure 1, we have an antenna that is specified solely by the angle between the two metal pieces, D.

The antenna feed where the radio positive and negative terminals connect to the antenna is at the center of the antenna. Our antenna here is infinitely long in both directions, so that wavelength never comes into the equation. As a result, this antenna would theoretically have an infinite bandwidth, because if it works at one frequency any frequency , it must work at ALL frequencies, because the antenna looks the same at all wavelengths. This is a nice antenna.

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Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks. In GUI programming, when we change one widget, we often want another widget to be notified.

More generally, we want objects of any kind to be able to communicate with one another. For example, if a user clicks a Close button, we probably want the window's close function to be called. Older toolkits achieve this kind of communication using callbacks. A callback is a pointer to a function, so if you want a processing function to notify you about some event you pass a pointer to another function the callback to the processing function.

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The processing function then calls the callback when appropriate. Callbacks have two fundamental flaws: Firstly, they are not type-safe.

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We can never be certain that the processing function will call the callback with the correct arguments. Secondly, the callback is strongly coupled to the processing function since the processing function must know which callback to call. In Qt, we have an alternative to the callback technique: We use signals and slots.

A signal is emitted when a particular event occurs. Qt's widgets have many predefined signals, but we can always subclass widgets to add our own signals to them. A slot is a function that is called in response to a particular signal. Qt's widgets have many pre-defined slots, but it is common practice to subclass widgets and add your own slots so that you can handle the signals that you are interested in.

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