1、 TIA-329.3-1 (Addendum to TIA-329.3) October 2013Minimum Standards for Communications Antennas Part 3: Portable Antennas NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitatin
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5、 use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Project No. TIA-PN-329.3-1, formulated under the cognizance of
6、 the TIA TR-8 Mobile and Personal Private Radio TR-8.11 Subcommittee on Antenna Systems). Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Technology (b) there is no assurance that the Document will be approved by any Committee of TIA or any other body in its present or any other form; (c) the D
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19、ATIONS. TIA 329.3-1 SCOPE This Addendum is intended to amplify on and clarify the methods of measuring portable antenna patterns in situations where the antenna is integrated into the device yet the output power of the device is known within a given tolerance. TIA-329.3-1 1. Modify 4.4 to read as fo
20、llows: 4.4 Hand-held mobile (cellular/PCS/wireless) telephones Mobile or “wireless” telephones are available in a number of form factors including “candy bar”, “flip phone”, “slider”, and PDA. Most modern mobile telephones have the antenna integrated into the unit, thus making field strength or powe
21、r density an appropriate performance measurement, as in 4.3. However, the power output may be known in some cases. In those cases, it is possible to measure the actual antenna performance, with the added benefit of being able to characterize performance in the receiving direction, as well. For those
22、 mobile telephones that still use external antennas, actual antenna performance is preferred. Mobile telephones are probably the only type of device where the most common operating position for both transmitting and receiving (since they are duplex) is held to the side of the head. Mobile telephones
23、 are ubiquitous in the modern world so there is no need for a figure to show their appearance. 2. Modify 4.5 to read as follows: 4.5 Devices intended to be plugged-in to a laptop computer A class of devices is intended to be plugged-in to a laptop computer. Some of these devices are designed to plug
24、-in to the computers CardBus, PCMCIA or ExpressCardport, whereas others are designed to plug-in to a USB port. Most of these devices include an integrated antenna, lending themselves to using field strength as a performance measurement. However, the power output may be known in some cases. In those
25、cases, it is possible to measure the actual antenna performance, with the added benefit of being able to characterize performance in the receiving direction, as well. Certain PC Cardand Express Carddevices are known to exist that include an RF connector (typically, sub-miniature type A connector, or
26、 MCX) that can be connected to an external antenna. Some external antennas are made that mount to the part of the laptop computer that holds the screen, elevating the antenna somewhat. These antennas should be tested like any other antenna. TIA 329.3-1 3. Modify 5.2 to read as follows: 5.2 Measureme
27、nts on Integral Antennas The gain of an integrated antenna cannot, obviously, be directly measured if the power to the antenna is unknown. However, it is possible to assess the performance of a given device that includes an integral antenna even in cases where the power to the antenna is unknown. To
28、 the extent that they are not contradicted by this clause, all other subsections of this Standard are applicable to integrated antennas as well. 5.2.1 through 5.2.2.2 treat the cases of receiving and transmitting devices, respectively in the case where the power to the antenna is unknown or in the c
29、ase of a receiver that has no associated transmitter. Both sub-clauses apply to devices that do both. 5.2.3 treats the cases where the transmit power is known or known within a tolerance value. 4. Re-title 5.2.1 as follows: 5.2.1 Receiving Devices Not Sharing an Antenna With a Transmitter With Known
30、 Output Power 5. Modify 5.2.2 to read as follows: 5.2.2 Transmitting Antennas For transmitting devices with integrated antennas and unknown power to the antenna, the appropriate measured value is the effective radiated power (ERP). At frequencies below 1 GHz, the appropriate reference is a dipole an
31、tenna. At frequencies of 1 GHz or greater, the reference is an isotropic radiator. The ERP referenced to a dipole and to an isotropic radiator are denoted ERPd and EIRP, respectively. The test is performed in the same direction as described in Clause 5.1; i.e. with the test subject transmitting. TIA
32、-329.3-1 6. Add 5.2.3, as follows: 5.2.3 Integral Antenna but Known Transmitter Output Power The method of measuring a device with an integral antenna follows that of 5.1 except as described in the following paragraphs: Because it is impossible to connect the device to the calibration antenna, a sig
33、nal generator is connected to the calibration antennai. The power reaching the calibration antenna is measured. If the calibration antenna has an integral transmission line, the loss of the transmission line is subtracted out to yield the power actually reaching the calibration antenna. The antenna
34、gain is calculated as follows: = _+. (7) Where, Gdevis the gain of the devices antenna in dB referenced to the same antenna that GCalAntis referenced to. PR_devis the power received by the measuring receiver from the device Po_devis the known power output from the device PR_CalAntis the power receiv
35、ed by the measuring receiver from the calibration antenna Po_CalAntis the known power reaching the calibration antenna GCalAntis the known gain of the calibration antenna referenced to the desired reference antenna. In some cases where the transmitter output from a device is known, it is only known
36、within a tolerance (e.g. 2 dB). In those cases any published results from calculations described in this subclause shall have the appropriate notation that the results are valid only with the appropriate tolerance. Note that in the case of an unbalanced tolerance (e.g. +1/-3 dB) on the device output
37、 power, equation (7) reverses the sign, so that the antenna gain of the device would have a tolerance of +3/-1 dB in this example. iNote that appropriate steps must be taken to avoid reflections off of the signal generator itself. THE TELECOMMUNICATIONS INDUSTRY ASSOCIATION TIA represents the global
38、 information and communications technology (ICT) industry through standards development, advocacy, tradeshows, business opportunities, market intelligence and world-wide environmental regulatory analysis. Since 1924, TIA has been enhancing the business environment for broadband, wireless, informatio
39、n technology, cable, satellite, and unified communications. TIA members products and services empower communications in every industry and market, including healthcare, education, security, public safety, transportation, government, the utilities. TIA is accredited by the American National Standards Institute (ANSI).
