Slot monopole antenna
The slot antenna, consisting of a narrow slit in a ground plane, is a very versatile antenna. With modification, it is amenable to waveguide, coplanar waveguide (CPW), coaxial, slot line, or microstrip feeding schemes and has been used in all aspects of wireless and radar applications. The propagation characteristic of this antenna is similar to that of a dipole antenna, but the slot antenna impedance is high (several hundred Ohms). The antenna impedance is adjusted by moving the feedpoint location. If this antenna is cut in half, it will become an open-slot antenna with propagation characteristics similar to a monopole antenna. A resonant monopole slot antenna including a radiating slot with an open-end, which is dimensioned such that the slot is equivalent electromagnetically to an odd number of quarter wavelengths at the antenna's operating frequency, wherein the antenna's feed is arranged at the open-end of the radiating CASINOER.PRO by:
US6618020B2 - Monopole slot antenna - Google Patents
Generally the antenna designer prefers increased volume for the cavity, and should determine the minimum overall volume for acceptable performance. An antenna according to claim 1 , wherein said feed comprises a conductor extending transversely across the radiating slot at its open end. A planar dual-frequency antenna and the plane antenna provided with a radio device. Isotropic radiator. In the E-plane, the pattern is fairly broad, with a 3-dB beamwidht of about degrees. AUB2 en.
Slot antennas have found wide application in the field of radio communication. Conventional slot antennas comprise halfwave elements. This has put them at a disadvantage, with regard to size, compared with patch or wire antennas, such as the PIFA planar inverted-F antenna , which can be constructed with quarterwave elements. Ideally, a wire monopole antenna or the like comprises a quarterwave radiating element perpendicular to an infinite ground plane.
This configuration is in practice impossible to achieve. However, in some circumstances, such as a mobile phone, it is impossible even to approximate this configuration well because of other design constraints.
An object of the present invention is to provide a slot antenna that is not at a size disadvantage to PIFA antennas. According to the present invention, there is provided a resonant monopole slot antenna including a radiating slot which is dimensioned such that the slot is equivalent electromagnetically to an odd number of quarter wavelengths at the antenna's operating frequency, wherein the antenna's feed is arranged at the open end of the radiating slot.
Feeding the slot at it open end provides a broader usable bandwidth than feeding at a position towards the closed end. The radiating slot may be straight or not straight. If the slot is not straight, it may be, for example, L-shaped or meander. Preferably, the radiating slot comprises an area of a printed circuit board which is free of conductor. More preferably, said area extends to an edge of the printed circuit board.
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Previous: Slot Antennas Intro. Antennas List. Antenna Tutorial Home. The previous page introducing slot antennas was primarily theoretical giving you an intuitive idea of how slot antennas work ; however, since it was about an infinite conducting plane it is not entirely practical. A practical slot antenna is the cavity-backed slot antenna. Unfortunately, the equations related to the cavity backed slot antenna are somewhat complicated and in my opinion don't give a good idea of how they work.
Hence, I'll present the basics, present some experimental results and try to give an idea of design parameters. The walls are metallic electrically conducting , and the inside is hollow. On one end, a slot is cut out. The cavity is typically excited by a probe antenna in the intererior of the cavity, which typically is modelled as a monopole antenna.
The exciting monopole antenna is shown in green. Figure 1. Cavity-backed slot antenna. I'll give some experimental results for this antenna. The height of the monopole antenna will be The monopole will be centered about the cavity in the y-direction, and The slot is 58mm long in the y-direction and 3 mm high in the z-direction.
The monopole is also S11 is measured for this antenna relative to a 50 Ohm source , and is plotted versus frequency in Figure 2. Figure 2. S11 as a function of Frequency for the Cavity-backed Slot Antenna. This cavity-backed slot antenna has a first resonance at about 2. At this frequency, the cavity backed slot antenna is roughly 0. S11 drops to below dB at this frequency, indicating that most of the power is radiated away. The bandwidth , measured somewhat arbitrarily as the frequency span that S11 is less than -6 dB is roughly from 2.
Note that two other dips 'resonances' in the S11 curve occur, at approximately 3 GHz and 4. At these frequencies, the slot length is 0. The volume of the cavity typically influences the bandwidth - a larger volume often yields a higher bandwidth. The material within the cavity so far I have assumed it was filled with air , can be replaced with a dielectric medium. This reduces the resonant length of slot, allowing for a smaller antenna.
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