4692

Ring slot antenna

The design of a microstrip-fed annular-ring slot antenna (ARSA) with circular polarization (CP) radiation is initially studied. To obtain CP radiation with broad 3-dB axial ratio (AR) bandwidth that can cover the WiMAX GHz (– MHz, – MHz) and WLAN GHz (– MHz) bands, a novel technique of extending an inverted. The design of a switchable microstrip-fed half annular ring slot antenna for multi-frequency operation is proposed. By incorporating three switches along the meandered tuning stub that is loaded. An array antenna is disclosed wherein each one of the antenna elements includes at least two concentric slots formed in a conductive sheet. The conductive sheet is disposed on a dielectric support and a ground plane is found on the opposite surface of such support. The inner one of the slots enables the outer slot to radiate radio frequency energy having a wavelength greater than the.

US4208660A - Radio frequency ring-shaped slot antenna - Google Patents

When assembled, the array antenna 10 provides a compact flush-mountable array antenna adapted to operate at 1. Those switches are positioned in the slot places underneath the patch. The resonant frequency of the TM 11 mode could be expressed as [12] The inner one of the slots enables the outer slot to radiate radio frequency energy having a wavelength greater than the circumference of such outer slot. It also occupies less volume than reported antenna [1, 12].

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A Frequency Reconfigurable Half Annular Ring Slot Antenna Design

Do you want to read the rest of this article? For full functionality of ResearchGate it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser. A new design of a microstrip-line-fed circularly polarized printed ring slot antenna is proposed.

The asymmetry introduced in the proposed design is a meandered-slot section and the proposed CP design can be applied to printed square and annular ring slot antennas.

Prototypes of the proposed design have been implemented. Experimental results show that good CP radiation performances are obtained and the 3 dB axial-ratio CP bandwidths obtained for the square and annular ring slot antennas are about 4.

The reader antenna is one of the most important component in an RFID system which is designed for circular polarization CP operation, because circularly polarized antennas can fairly communicate with linearly polarized antennas with random orientations and also avoid the polarization losses and mismatches caused by multipath effects.

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Do you want to read the rest of this article? For full functionality of ResearchGate it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser. The design of a switchable microstrip-fed half annular ring slot antenna for multi-frequency operation is proposed.

By incorporating three switches along the meandered tuning stub that is loaded on top of the half circular patch located within the circular slot, easy reconfigurability of four frequency bands over a frequency ratio of approximately 1. Furthermore, the proposed antenna structure does not require additional DC biasing circuit.

Simulation and measurement results have demonstrated that the four frequency bands can exhibit good impedance matching, stable radiation patterns and desirable gains. Several frequency-reconfigurable slot-based antennas appeared recently in the literature. Single-element antennas were presented in [2] —[9]. In[2], microstrip-fed-based frequencyreconfigurable half annular ring slot antenna was presented. The frequency bands covered were 2. Single-element antennas were presented in[2]—[9].

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In [2] , microstrip-fed-based frequencyreconfigurable half annular ring slot antenna was presented. Such reconfigurable antennas are important for achieving optimum performance of wireless systems under various environmental conditions. Compared with frequencyswitched antennas which operate at some predefined separate frequency bands [7], [8] , frequency-tunable antennas can achieve dynamic control of relatively narrow instantaneous bandwidths, thus allowing operation over a larger bandwidth.

Compact communication systems working in these standards required a compact size[5], low cost and multiband antenna[6][7][8]. Meander technologies are the most investigated for the design of reconfigurable structures [9] , which allows small size designs, by increasing the electric length of the patch, and wide band operations[10]. Several meander reconfigurable antenna designs were reported in the literature for wireless applications.

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Slot machines are also known as one-armed bandits because they were originally operated by one lever on the side of the machine, as distinct from a button on the front panel, and because of their ability to leave the player impoverished or in debt, with bandit as a synonym for "thief". Slot machines include a currency detector that validates the money inserted to play. The machine pays off according to patterns of symbols visible on the front of the machine when it stops.

Modern computer technology has resulted in variations on the slot machine concept. Slot machines are the most popular gambling method in casinos and constitute about 70 percent of the average US casino's income. The "slot machine" term derives from the slots on the machine for inserting and retrieving coins. It contained five drums holding a total of 50 card faces and was based on poker.

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This machine proved extremely popular and soon many bars in the city had one or more of the machines. Players would insert a nickel and pull a lever, which would spin the drums and the cards they held, the player hoping for a good poker hand. There was no direct payout mechanism, so a pair of kings might get the player a free beer, whereas a royal flush could pay out cigars or drinks, the prizes wholly dependent on what was on offer at the local establishment.

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To make the odds better for the house, two cards were typically removed from the deck: The drums could also be rearranged to further reduce a player's chance of winning. Due to the vast number of possible wins with the original poker card-based game, it proved practically impossible to come up with a way to make a machine capable of making an automatic payout for all possible winning combinations.

The bell gave the machine its name. By replacing ten cards with five symbols and using three reels instead of five drums, the complexity of reading a win was considerably reduced, allowing Fey to devise an effective automatic payout mechanism. Liberty Bell was a huge success and spawned a thriving mechanical gaming device industry. Even when the use of these gambling devices was banned in his home state after a few years, Fey still couldn't keep up with demand for the game elsewhere. The Liberty Bell machine was so popular that it was copied by many slot machine manufacturers.

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