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indeed, widen the bandwidth to repeatable and manufacturability levels, but the losses introduced by this method may be unacceptably large Skillful antenna design is the most crucial aspect in achieving superior range and throughput in any wireless system Especially challenging is the area of small, handheld RF devices, where both the antenna and the RF output power are always a compromise To improve compact internal antenna design, follow these guidelines: a The antenna s ground area (if required) should be as large and as uniform as the available space permits b The antenna must be placed far from the PCB s noise-producing circuit elements c The antenna should not have other conducting traces or wires placed in parallel nearby d The antenna should be fed with coax or PCB microstrip and not simple wire e If the antenna is of the printed type, it should be composed of wide traces f The antenna should be as close to full size as possible, or not less than 50% of its resonant size g The antenna should possess a low-loss LC match that is as close to the system impedance as possible
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In order to keep its length to a minimum, the internal type of monopole is normally a loaded antenna structure (Fig 106) However, monopoles employed for the higher microwave frequencies may commonly utilize full-length antennas, due to their small size Such full-length, resonant monopoles have an ideal radiation resistance of about 37 , and an unbalanced, single-ended, input When the quarter-wave monopole is placed over an infinite groundplane, it replicates the two poles of a full dipole antenna, mirroring the missing quarter-wave pole through the reflective ground surface, and will therefore possess the classic ideal characteristics of a theoretical monopole If the monopole is placed at right angles over any uniform groundplane area that has a radius of greater than one wavelength, the monopole s input characteristics and radiation pattern will still be very close to what it possessed with the hypothetical infinite groundplane But when the groundplane is decreased to a quarter wavelength or under, the monopole s characteristics start to become noticeably affected, and begin to depart from that of the ideal structure And because of the lack of any significant board space in almost all handheld wireless devices, this will be the normal state of the groundplane under a monopole The internal monopole s groundplane normally comprises, in a practical handheld implementation, the dedicated PCB copper groundplane, the RF shield, board traces, and even the operator s own hand But due to the size constraints, the monopole s groundplane may be under a half-wavelength radius, far from uniform in copper area, and not at right angles to the antenna structure, all of which will begin to adversely influence its efficiency and input impedance, as well as making the antenna hard to tune Add the PCB s own dielectric losses, in addition to the necessary matching lumped components and their losses, along with the antenna s proximity to nearby conductive coupling structures and EMI producing circuits, will make this a much less effective antenna than the full-size, external type It is, however, an extremely low-cost and
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Two different types of loaded monopole antennas
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practical antenna: a piece of wire, and perhaps an LC matching network, are all that are required
Internal PIFA antennas Antennas
The printed internal-F antenna (PIFA) of Fig 107 is a printed trace on a PCB that is essentially a quarter-wave vertical antenna, but that has been bent horizontally in order to be parallel with the substrate s copper ground pour, and then fed at an appropriate point that will supply a good input match PIFA is an excellent choice for small, low-profile wireless designs, and is not as adversely affected by tiny, poorly shaped groundplanes as that of the monopole above The PIFA also supplies decent efficiency, is of a compact geometry, and has a relatively omnidirectional radiation pattern (with some deep nulls) However, PIFA antennas do have somewhat of a narrower bandwidth than the average monopole
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