Herzlich Willkommen beim beam-Verlag in Marburg, dem Fachverlag für anspruchsvolle Elektronik-Literatur.


Wir freuen uns, Sie auf unserem ePaper-Kiosk begrüßen zu können.

Aufrufe
vor 7 Jahren

4-2017

  • Text
  • Komponenten
  • Technik
  • Radio
  • Filter
  • Oszillatoren
  • Quarze
  • Emv
  • Messtechnik
  • Bauelemente
  • Antenna
  • Antennas
  • Messung
  • Messungen
  • Frequenzbereich
  • Frequency
  • Elektromagnetische
  • Wireless
Fachzeitschrift für Hochfrequenz- und Mikrowellentechnik

RF & Wireless Figure 13:

RF & Wireless Figure 13: Design 2 maximum gain vs. frequency and radiation patterns for the є r = 3 and 13 cases [2] Harrington, R. F. (1960). „Effects of antenna size on gain, bandwidth, and efficiency“. Jour. Nat‘l Bureau of Standards. Washington D.C. USA: US National Bureau of Standards. 64–D: 1–12. [3] Milan Polivka, Milan Svanda, „Stepped Impedance Coupled-Patches Tag Antenna for Platform-Tolerant UHF RFID Applications,“ IEEE Transactions on Antennas and Propagation, Vol. 63, No. 9, pp. 3791- 3797, September 2015. [4] Shuai Shao, Robert J. Burkholder, and John L. Volakis, „Design Approach for Robust UHF RFID Tag Antennas Mounted on a Plurality of Dielectric Surfaces,“ IEEE Antennas and Propagation Magazine, Vol. 56, No. 5, October 2014, pp 158-166. [5] T. DeJeruyelle, P. Pannier, M. EgeJs, and E. Bergeret, “An RFID Tag Antenna Tolerant to Mounting on Materials,” IEEE Antennas and Propagation Magazine, Vol. 52, No. 4, pp 14-19, August 2010. [6] Jun Zhang, Yunliang Long, „A Dual-Layer Broadband Compact UHF RFID Tag Antenna for Platform Tolerant Application.“ IEEE Transactions on Antennas and Propagation, Vol. 61, No. 9, pp. 4447-4455, September 2013. [7] Jason D. Lohn, Derek S. Linden, Bruce Blevins, Thomas Greenling, Mark R. Allard, “Automated Synthesis of a Lunar Satellite Antenna System,” IEEE Trans. Antennas and Propagat., vol 63, no 4, pp.1436-1444, April 2015. [8] B.M. Kolundzija, J.S. Ognjanovic, T.K. Sarkar, R.F. Harrington, “WIPL-program for analysis of metallic antennas and scatterers,” Ninth International Conference on Antennas and Propagation, 1995 (ICAP ‚95), Conf. Publ. No. 407, 4-7 Apr 1995. [9] WIPL-D Pro v11.0, Software and User’s Manual, WIPL-D d.o.o., Belgrade, 2014. [10] http://hothardware.com/ news/3d-systems-3d-printingwith-conductive-ink-for-projectara-antennas Directional Patch Antennas for Body-Worn Tactical Applications RFMW Ltd. announced design and sales support for bodyworn antennas from Southwest Antennas. Model 1065-031 is a right-hand, circularly polarized (RHCP) antenna while model 1065-032 offers left-hand polarization (LHCP). Developed to offer high performance, rugged antenna options, the antenna radome housing is resistant to damage from drops, being stepped or jumped on, and other potential abuse. Both 1065-031 and 1065-032 antennas are designed for use with handheld or body-worn MIMO/MANET radio systems operating from 1350 to 1390 MHz. Circular polarization offers performance enhancements in multi-antenna radio configurations, crowded RF/non lineof-sight scenarios, and improved performance in adverse weather conditions providing greater radio range for law enforcement, military or civilian applications. Freespace gain is specified at 4.2 dBic. Measuring only 3.75 x 3.75 x 0.51 inches and weighing 3.4 ounces, the 1065-031 and 1065-032 feature a high performance stainless steel SMA(f) RF connector and waterproof, UV stable radome that can withstand immersion in 20 m of salt water for two hours if the RF connector is mated or sealed with a protective end cap. Southwest Antennas body worn products are easily secured into pouches, vests and MOLLE gear. ■ RFMW Ltd. info@rfmw.com www.rfmw.com 86 hf-praxis 4/2017

RF & Wireless Dual-channel rotary joint for X-band Radar systems The latest addition to Link Microtek’s extensive range of microwave rotary joints is a device featuring two X-band channels, both of which can be used to either transmit or receive signals in radar systems for coastal/border surveillance or critical infrastructure protection. Designed and manufactured at Link Microtek’s facility in Basingstoke, UK, the new AMCORJD-ALT1 device enables microwave signals to be fed to or from a compact radar antenna rotating continuously at in excess of 60 rpm and typically exposed to harsh environmental conditions such as wind, rain and salt spray. Both channels cover the frequency range 8.0 to 9.5 GHz and can handle average microwave powers in excess of 100 W and peak powers of over 200 W. Microwave performance is excellent, with a maximum insertion loss of only 1.2 dB, maximum VSWR of 1.5:1 and an isolation of 80 dB. In order to satisfy requirements for long life and continuous operation, this robustly constructed rotary joint uses a non-contacting design, so the only wearing parts are the bearings. It is fabricated from lightweight aluminium with an Iridite finish and incorporates IP65 sealing to protect it from the ingress of moisture and dust. Featuring N-type connectors on the rotating side and SMA-type connectors on the fixed side, the rotary joint has overall dimensions of 84 mm (D) x 124 mm (L), excluding the connectors and bulkhead mounting flange. Other rotary-joint configurations and sizes can be supplied on request, customised to suit specific radar antenna requirements. ■ Link Microtek Ltd www.linkmicrotek.com Extended-L Band Isolator/ Circulators Isolators & Circulators covering L band with SMA and Type N-Female connectors. With typical spec’s of; 50 watts (fwd), 1.45:1 VSWR, 0.9 dB Insertion Loss and 15 dB Isolation. Available from stock to 4 weeks ARO. Made in USA - 36 month warranty ■ MECA Electronics, Inc. www.e-MECA.com Right Angle SMA Attenuators MECA offers a series of 2 watt SMA right angle Attenuators operating up to 4 GHz. The 662-dB-1RA series attenuators cover all wireless applications from Hz – 4.0 GHz and available in standard values as well as odd values from 0 thru 32 dB. Made in USA, 36 month warranty. ■ MECA Electronics, Inc. www.e-MECA.com Low PIM 40 dB Coupler MECA’s Low PIM High Power (300 watts) Couplers meet and exceed the industry standard of -161 dBc typical for all your DAS Application needs. Available in 3, 6,10, 20 & now 40 dB models and weatherproof IP 67 standard and IP 68 available Type N. Made in USA and 36-month warranty! ■ MECA Electronics, Inc. www.e-MECA.com Overshoot-Free 5-Bit Digital Attenuator to 6GHz RFMW, Ltd. announces design and sales support for a Digital Step Attenuator (DSA). The Qorvo RFSA3523 offers 5-bits of attenuation with 0.5dB LSB step size providing 15.5dB of attenuation range from 5 to 6000MHz. Featuring overshoot-free transient switching between attenuation steps, the RFSA3523 is ideal for wireless infrastructure, military radio, land mobile radio and access points. High linearity (IIP3 >55dBm), fast switching speed of 120nS and low insertion loss of 1.4dB typify performance. SOI technology improves robustness and allows on-board logic control for serial interface. Qorvo offers this DSA in a 3x3mm QFN package. ■ RFMW, Ltd. www.rfmw.com 5G Ready Millimeter-Wave Products MECA offers a Family of 5G ready Millimeter-wave Power Dividers, Couplers, Isolators, Attenuators, Terminations, DC Blocks & Bias Tee’s covering up to 40 GHz with 2.92 mm connectors. Ideal for Satcom, 5G and backhaul upgrade applications. ■ MECA Electronics, Inc. www.e-MECA.com hf-praxis 4/2017 87

hf-praxis

PC & Industrie

© beam-Verlag Dipl.-Ing. Reinhard Birchel