DOCSLIB.ORG

AB Antenna Family.Qxp

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
AB Antenna Family.Qxp WIRELESS PRODUCTS Airborne™ Antenna Product Family ACH2-AT-DP000 series ACH0-CD-DP000 series (other accessories) Airborne™ Antennas are designed for connection to 802.11 wireless devices operating in the 2.4GHz ISM band. These antennas fully support the entire line of Airborne™ wireless 802.11 products. This assortment of antennas is intended to provide OEMs with solutions that meet the demanding and diverse requirements for transportation, medical, warehouse logistics, POS, industrial, military and scientific applications. Applications The Airborne™ Antenna family offers antennas for embedded applications, fixed stations, mobile operation and client side devices, and for indoor and outdoor applications. The antennas feature RP-SMA, N-type and U.FL connectors that provide the designer with flexible ways to connect to Airborne wireless products. A wide range of antenna types and gain options enable an OEM to select the antenna that best matches their application requirements. The Recommended for AirborneTM 802.11 lower gain and smaller antennas, such as the “rubber duck” antennas, would fit applications embedded and system bridge products where the range is not required to exceed 200- 400m while the higher gain directional antennas Made for Embedded or External mounting, would be suitable for extended range that require greater than 800m reach. Embedded antennas Mobile or Fixed station, and Indoor and/or provide ranges from 50m up to 300m. Outdoor operation Specialty Antenna Embedded antenna options are intended for Select from Omni Directional, Highly applications where it is not desirable to use an Directional, or Corner Reflector external antenna, or where the enclosure or application does not allow for an external antenna. Embedded antennas placed inside an Choose the antenna gain option to match enclosure provide a convenient solution and can your application be used as a pair with diversity enabled to improve efficiency. RP-SMA, N-Type and U.FL connectors To meet the demands for targeted solutions in the supported transportation industry, consider the ACH2- AT-DP011, a low profile, mobile, high gain omni- directional whip antenna with an integrated Adapter cables & accessories available magnetic mount. Customized antenna options are also available. 30B270-00 This document contains information on a product that is currently released to production at DPAC Technologies Corp. and Quatech, Inc. Page 1 of 2 Rev. B 11/05 DPAC and Quatech reserve the right to change products or specifications herein without prior notice. Airborne™ - Antenna Product Family WIRELESS PRODUCTS Product Line Model No. Description Indoor/Outdoor Internal/External Gain Connector Style Radiation Pattern ACH2-AT-DP002 2Dbl Portable(Rubber duck) Antenna (RP-SMA) I E 2 dBi RP-SMA Whip Omni ACH2-AT-DP003 5Dbl Portable (Rubber duck) Antenna (RP-SMA) I E 5 dBi RP-SMA Whip Omni ACH2-AT-DP004 5Dbl Portable(Rubber duck) Antenna, Flying Lead (U.FL) I E 5 dBi U.FL Whip Omni Corner ACH2-AT-DP005 15 dBi Corner Reflector Antenna (RP-SMA), Indoor/Outdoor I/O E 15 dBi RP-SMA Reflector Directional ACH2-AT-DP006 7 dBi Patch (RP-SMA) Antenna, Indoor/Outdoor I E 7 dBi RP-SMA Patch Directional ACH2-AT-DP007 8.5 dBi Fiberglass Omnidirectional Antenna (N-Type) Indoor/Outdoor I/O E 8.5 dBi N-type Fiberglass Omni ACH2-AT-DP008 10 dBi Patch Antenna (RP-SMA) Indoor/Outdoor I/O E 10 dBi RP-SMA Patch Directional ACH2-AT-DP009 20 dBi Panel (N-Type) Antenna, Indoor/Outdoor I/O E 20 dBi N-Type Patch Directional ACH2-AT-DP010 11 dBi Fiberglass Omnidirectional Antenna (N-Type) Indoor/Outdoor I/O E 11 dBi N-Type Fiberglass Omni Whip - ACH2-AT-DP011 5 dBi Magnetic mount vehicle Antenna, Indoor/Outdoor I/O E 5 dBi RP-SMA Magnetic Omni mount Model No. Other Accessories Indoor/Outdoor Internal/External Connector Cable Length ACH0-CA-DP001 Adapter Cable, U.FL (plug) to U.FL (plug), 200mm, Internal - I U.FL to U.FL 200mm ACH0-CA-DP004 Adapter Cable, RP-SMA (Jack) to U.FL (plug), 100mm, Indoor/Outdoor I/O - RP-SMA 100mm Accessories Adapter Cable RP-SMA (Jack) to U.FL (Plug) ACHO-CA-DP004 This adapter is designed to provide an enclosure-mountable direct cable connection to the Airborne™ embedded modules. The DP004 eliminates the need for board-level design or RF layout by enabling a direct Coaxial connection between the Airborne module and an RP-SMA Jack. An RP-SMA jack can be directly mounted to the equipment enclosure. Adapter Cable U.FL (Plug) to U.FL (Plug) ACHO-CA-DP001 This adapter makes the connection from the Airborne™ embedded module to a board- mounted U.FL connector. This allows a direct coaxial connection between the Airborne™ module and the main-board. Connection to the antenna can then be made through routing and appropriate board mounted connector. D PAC Technologies Products & Services for the integration A g e 7321 Lincoln Way, Garden Grove, CA 92841 Tel 714 898 0007 Fax 714 897 1772 www.dpactech.com 30B270-00 Rev. B 11/05 ©2005 DPAC Technologies and Quatech, Inc. All right s reserved. DPAC Technologies ® ,Airborne™ are trademarks of DPAC Technologies Corp. Page 2 of 2.
Load more

Recommended publications
  • ANTENNAS for LOW POWER APPLICATIONS Basic Full
    ANTENNAS FOR LOW POWER APPLICATIONS By Kent Smith Introduction: There seems to be little information on compact antenna design for the low power wireless field. Good antenna design is required to realize good range performance. A good antenna requires it to be the right type for the application. It also must be matched and tuned to the transmitter and receiver. To get the best results, a designer should have an idea about how the antenna works, and what the important design considerations are. This paper should help to achieve effective antenna design. Some Terms: Wavelength; Important for determination of antenna length, this is the distance that the radio wave travels during one complete cycle of the wave. This length is inversely proportional to the frequency and may be calculated by: wavelength (cm)=30000 / frequency (Mhz). Groundplane; A solid conductive area that is an important part of RF design techniques. These are usually used in transmitter and receiver circuits. An example is where most of the traces will be routed on the topside of the board, and the bottom will be a mostly solid copper area. The groundplane helps to reduce stray reactances and radiation. Of course, the antenna line needs to run away from the groundplane. dB, or decibel; A logarithmic scale used to show power gain or loss in an rf circuit. +3 dB is twice the power, while -3 dB is one half. It takes 6 dB to double or halve the radiating distance, due to the inverse square law. The Basic Antenna, and how it works. An antenna can be defined as any wire, or conductor, that carries a pulsing or alternating current.
    [Show full text]
  • Antenna Selection Guide by Richard Wallace
    Application Note AN058 Antenna Selection Guide By Richard Wallace Keywords • Antenna Selection • 433 MHz (387 – 510 MHz) Antenna • Anechoic Chamber • 868 MHz (779 – 960 MHz) Antenna • Antenna Parameters • 915 MHz (779 – 960 MHz) Antenna • 169 MHz (136 – 240 MHz) Antenna • 2.4 GHz Antenna • 315 MHz (273 – 348 MHz) Antenna • CC-Antenna-DK 1 Introduction This application note describes important In addition different antenna types are parameters to consider when deciding presented, with their pros and cons. All of what kind of antenna to use in a short the antenna reference designs available range device application. on www.ti.com/lpw are presented including the Antenna Development Kit Important antenna parameters, different [29]. antenna types, design aspects and techniques for characterizing antennas are The last section in this document contains presented. Radiation pattern, gain, references to additional antenna impedance matching, bandwidth, size and resources such as literature, applicable cost are some of the parameters EM simulation tools and a list of antenna discussed in this document. manufacturer and consultants. Antenna theory and practical Correct choice of antenna will improve measurement are also covered. system performance and reduce the cost. Figure 1. Texas Instruments Antenna Development Kit (CC-Antenna-DK) SWRA161B Page 1 of 44 Application Note AN058 Table of Contents KEYWORDS 1 1 INTRODUCTION 1 2 ABBREVIATIONS 3 3 BRIEF ANTENNA THEORY 4 3.1 DIPOLE (Λ/2) ANTENNAS 4 3.2 MONOPOLE (Λ/4) ANTENNAS 5 3.3 WAVELENGTH CALCULATIONS
    [Show full text]
  • Performance and Radiation Patterns of a Reconfigurable Plasma Corner-Reflector Antenna Mohd Taufik Jusoh Tajudin, Mohamed Himdi, Franck Colombel, Olivier Lafond
    Performance and Radiation Patterns of A Reconfigurable Plasma Corner-Reflector Antenna Mohd Taufik Jusoh Tajudin, Mohamed Himdi, Franck Colombel, Olivier Lafond To cite this version: Mohd Taufik Jusoh Tajudin, Mohamed Himdi, Franck Colombel, Olivier Lafond. Performance and Radiation Patterns of A Reconfigurable Plasma Corner-Reflector Antenna. IEEE Antennas and Wireless Propagation Letters, Institute of Electrical and Electronics Engineers, 2013, pp.1. 10.1109/LAWP.2013.2281221. hal-00862667 HAL Id: hal-00862667 https://hal-univ-rennes1.archives-ouvertes.fr/hal-00862667 Submitted on 17 Sep 2013 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. 1 Performance and Radiation Patterns of A Reconfigurable Plasma Corner-Reflector Antenna Mohd Taufik Jusoh, Olivier Lafond, Franck Colombel, and Mohamed Himdi [9] and reactively controlled CRA in [10] were proposed to Abstract—A novel reconfigurable plasma corner reflector work at 2.4GHz. A mechanical approach of achieving variable antenna is proposed to better collimate the energy in forward beamwidth by changing the included angle of CRA was direction operating at 2.4GHz. Implementation of a low cost proposed in [11]. The design was simulated and measured plasma element permits beam shape to be changed electrically.
    [Show full text]
  • Investigating Energy Harvesting Technology to Wirelessly Charge Batteries of Mobile Devices
    Investigating energy harvesting technology to wirelessly charge batteries of mobile devices By Neetu Ramsaroop (19751797) Submitted in fulfilment of the requirements of the Master of Information and Communications Technology degree In the Department of Information Technology in the Faculty of Accounting and Informatics Durban University of Technology Durban, South Africa July, 2017 DECLARATION I, Neetu Ramsaroop, declare that this dissertation represents my own work and has not been previously submitted in any form for another degree at any university or institution of higher learning. All information cited from published and unpublished works have been acknowledged. ________________________ ____________________________ Student Date Approved for final submission Supervisor: ___________________________ ____________________________ Prof. O. O. Olugbara Date Co-supervisors: ___________________________ ____________________________ Esther D. Joubert Date i DEDICATION To My family and my supportive friends ii ACKNOWLEDGMENTS I am grateful to God for embracing me with the strength and inspiration all through this research journey. My sincere gratitude is accorded to my Supervisor, Professor O.O. Olugbara, for his dedication, academic knowledge, expertise, guidance, patience, direction, feedback, comments and meticulous checking of this study. Not to mention his “reminder” phone calls to keep me in check. I would also like to express my deepest appreciation to my Co-Supervisor, Mrs Esther Joubert, for her dedication, constant encouragement, guidance, motivation, outstanding academic writing, patience with my messages at odd hours, dealing with my panic moments and the pleasant manner in which she provided direction in this study. I am thankful to all my friends, DUT colleagues and work colleagues for their support, motivation and advice during this work.
    [Show full text]
  • Compact Integrated Antennas Designs and Applications for the Mc1321x, Mc1322x, and Mc1323x
    Freescale Semiconductor Document Number: AN2731 Application Note Rev. 2, 12/2012 Compact Integrated Antennas Designs and Applications for the MC1321x, MC1322x, and MC1323x 1 Introduction Contents 1 Introduction . 1 With the introduction of many applications into the 2 Antenna Terms . 2 2.4 GHz band for commercial and consumer use, 3 Basic Antenna Theory . 3 Antenna design has become a stumbling point for many 4 Impedance Matching . 5 customers. Moving energy across a substrate by use of an 5 Antennas . 8 RF signal is very different than moving a low frequency 6 Miniaturization Trade-offs . 11 voltage across the same substrate. Therefore, designers 7 Potential Issues . 12 who lack RF expertise can avoid pitfalls by simply 8 Recommended Antenna Designs . 13 following “good” RF practices when doing a board 9 Design Examples . 14 layout for 802.15.4 applications. The design and layout of antennas is an extension of that practice. This application note will provide some of that basic insight on board layout and antenna design to improve our customers’ first pass success. Antenna design is a function of frequency, application, board area, range, and costs. Whether your application requires the absolute minimum costs or minimization of board area or maximum range, it is important to understand the critical parameters so that the proper trade-offs can be chosen. Some of the parameters necessary in selecting the correct antenna are: antenna © Freescale Semiconductor, Inc., 2005, 2006, 2012. All rights reserved. tuning, matching, gain/loss, and required radiation pattern. This note is not an exhaustive inquiry into antenna design. It is instead, focused toward helping our customers understand enough board layout and antenna basics to aid in selecting the correct antenna type for their application as well as avoiding the typical layout mistakes that cause performance issues that lead to delays.
    [Show full text]
  • Antenna Articles Collection of Short Articles Relating to All Manners of Antennas
    Antenna Tips page 1 of 31 Source : http://www.funet.fi/pub/dx/text/antennas/antinfo.txt Antenna Articles Collection of short articles relating to all manners of antennas. These articles are the hard work of Wayne Sarosi KB4YLY (995 Alabama Street, Titusville, FL 32796) SUBJECT: Circular Polarized Antenna There has been a request for a series on 'CP' antennas. The term 'CP' eluded me at first as I was not familar with the abriviated designator for circular polarization. At work, we just use the entire words. I'm going to begin this ten part series with the basics. After researching CP designs with a few engineers and fellow hams, I found that they knew very little about the subject. I also found I didn't know quite as much as I thought I did about circular polarization. So starting at the begining will help all out. First, let's discuss the circular polarized wave. There seems to be conflicting standards used by the world of physics and the IEEE. I found this to be true in four reference manuals including the ARRL Antenna Handbook. At least it's stated right up front but biased according to which text you read. We will follow the IEEE/ARRL standard in the following series for obvious reasons. There are two types of circular polarization; right and left. All of us agree up to this point. According to the ARRL Antenna Handbook, the following statement: 'Polarization Sense is a critical factor, especially in EME work or if the satellite uses a circular polarized antenna.
    [Show full text]
  • Evaluation of an Electronically Switched Directional Antenna for Real-World Low-Power Wireless Networks
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Swedish Institute of Computer Science Publications Database Evaluation of an Electronically Switched Directional Antenna for Real-world Low-power Wireless Networks Erik Ostr¨ om,¨ Luca Mottola, Thiemo Voigt Swedish Institute of Computer Science (SICS), Kista, Sweden Abstract. We present the real-world evaluation of SPIDA, an electronically swit- ched directional antenna. Compared to most existing work in the field, SPIDA is practical as well as inexpensive. We interface SPIDA with an off-the-shelf sensor node which provides us with a fully working real-world prototype. We assess the performance of our prototype by comparing the behavior of SPIDA against tradi- tional omni-directional antennas. Our results demonstrate that the SPIDA proto- type concentrates the radiated power only in given directions, thus enabling in- creased communication range at no additional energy cost. In addition, compared to the other antennas we consider, we observe more stable link performance and better correspondence between the link performance and common link quality estimators. 1 Introduction The use of external antennas is a common design choice in many deployments of low- power wireless networks [13]. Indeed, an external antenna often features higher gains compared to the antennas found aboard mainstream devices, enabling increased relia- bility in communication at no additional energy cost. To implement such design, re- searchers and domain-experts have hitherto borrowed the required technology from WiFi networks [10, 22]. This holds both w.r.t. scenarios requiring omni-directional communication [22], and where the application at hand allows directional communica- tion [10].
    [Show full text]
  • Improvement of RF Wireless Power Transmission Using a Circularly Polarized Retrodirective Antenna Array with EBG Structures
    applied sciences Article Improvement of RF Wireless Power Transmission Using a Circularly Polarized Retrodirective Antenna Array with EBG Structures Son Trinh-Van, Jong Min Lee, Youngoo Yang, Kang-Yoon Lee and Keum Cheol Hwang * ID School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea; [email protected] (S.T.-V.); [email protected] (J.M.L.); [email protected] (Y.Y.); [email protected] (K.-Y.L.) * Correspondence: [email protected]; Tel.: +82-31-290-7978 Received: 14 December 2017; Accepted: 22 February 2018; Published: 26 February 2018 Abstract: This paper presents the performance improvement of a circularly polarized (CP) retrodirective array (RDA) through the suppression of mutual coupling effects. The RDA is designed based on CP Koch-shaped patch antenna elements with an inter-element spacing as small as 0.4l for a compact size (l is the wavelength in free space at the designed frequency of 5.2 GHz). Electromagnetic band gap (EBG) structures are applied to reduce the mutual coupling between the antenna elements, thus improving the circular polarization characteristic of the RDA. Two CP RDAs with EBGs, in the case 5 × 5 and 10 × 10 arrays, are used as wireless power transmitters to transmit a total power of 50 W. A receiver is located at a distance of 1 m away from the transmitter to harvest the transmitted power. At the broadside direction, the simulated results demonstrate that the received powers are improved by approximately 11.32% and 12.45% when using the 5 × 5 and 10 × 10 CP RDAs with the EBGs, respectively, as the transmitters.
    [Show full text]
  • Various Types of Antenna with Respect to Their Applications: a Review
    INTERNATIONAL JOURNAL OF MULTIDISCIPLINARY SCIENCES AND ENGINEERING, VOL. 7, NO. 3, MARCH 2016 Various Types of Antenna with Respect to their Applications: A Review Abdul Qadir Khan1, Muhammad Riaz2 and Anas Bilal3 1,2,3School of Information Technology, The University of Lahore, Islamabad Campus [email protected], [email protected], [email protected] Abstract– Antenna is the most important part in wireless point to point communication where increase gain and communication systems. Antenna transforms electrical signals lessened wave impedance are required [45]. into radio waves and vice versa. The antennas are of various As the knowledge about antennas along with its application kinds and having different characteristics according to the need is particularly less thus this review is essential for determining of signal transmission and reception. In this paper, we present various antennas and their applications in different systems. comparative analysis of various types of antennas that can be differentiated with respect to their shapes, material used, signal In this paper a detailed review of various types of antenna bandwidth, transmission range etc. Our main focus is to classify which developed to perform useful task of communication in these antennas according to their applications. As in the modern different field of communication network is presented. era antennas are the basic prerequisites for wireless communications that is required for fast and efficient II. WIRE ANTENNA communications. This paper will help the design architect to choose proper antenna for the desired application. A. Biconical Dipole Antenna Keywords– Antenna, Communications, Applications and Signal There is no restriction to the data transfer capacity of an Transmission infinite constant-impedance transmission line however any pragmatic execution of the biconical dipole has appendages of constrained extend forming an open-circuit stub in the same I.
    [Show full text]
  • Antenna Catalog. Volume 3. Ship Antennas
    UNCLASSIFIED AD NUMBER AD323191 CLASSIFICATION CHANGES TO: unclassified FROM: confidential LIMITATION CHANGES TO: Approved for public release, distribution unlimited FROM: Distribution authorized to U.S. Gov't. agencies and their contractors; Administrative/Operational use; Oct 1960. Other requests shall be referred to Ari Force Cambridge Research Labs, Hansom AFB MA. AUTHORITY AFCRL Ltr, 13 Nov 1961.; AFCRL Ltr, 30 Oct 1974. THIS PAGE IS UNCLASSIFIED AD~ ~~~~~~O WIR1L_•_._,m,_, ANTENNA CATALOG Volume m UNCLASSIFIED SHIP ANTENN October 1960 Electronics Research Directorate AIR FORCE CAMBRIDGE RESEARCH LABORATORIES Can+rftc AT I9(6N4,4 101 by GEORGIA INSTITUTE OF TECHNOLOGY Engineering Experiment Station •o•log NOTIC 11ý4 Sadoqh amd P4is4,ej ww~aI~.. 1! d' ths, . 'to0 t,UL .. -+~~~~~-L#..-•...T... -w 0 I tdin #" "•: ..."- C UNCLASSIFIED AFCRC-TR-60-134(111) ANTENNA CATALOG Volume III SHIP ANTENNAS (Title UOwlnIied) October 1960 Appeoved: Mmurice W. Long, Electronics Division Submitteds A oed: Technical Information Section k Jeme,. L d, Directot Esis..ielng Expe•immnt Station Prepared by GEORGIA INSTITUTE OF TECHNOLOGY Engineering Experiment Station DOWNGRADED A-r 3 YEAR INTERVAIS. DECL~IFED AFTER 12 YEA&RS. DOD DIR 5200.10 UNC-LASSIFIED. , ~K-11. 574-1 ." TABLE OF CONTENTS Page INTRODUCTION . 1 EQUIPMENT FUNCTION ................ .................. ... 3 ANTENNA TYPE . 7 ANTENNA DATA AB Antennas ......... ................. .............. ...................... ... 15 AN Antennas ............................ ......................................
    [Show full text]
  • Recommendation Itu-R Bs.705-1*
    Rec. ITU-R BS.705-1 1 RECOMMENDATION ITU-R BS.705-1* HF transmitting and receiving antennas characteristics and diagrams** (1990-1995) The ITU Radiocommunication Assembly, considering a) that Resolution ITU-R 31 decided to issue a separately published Recommendation containing a revised and complemented set of HF broadcasting antenna diagrams together with other relevant information; b) that the diagrams published in this Recommendation should be easy to be understood and used by the planning and designing engineers, while retaining all the necessary useful information; c) the experience gained with the previous editions of the ex-CCIR publication “Antenna diagrams”; d) that the characteristics of the HF antennas as contained in Annexes 1 and 2 to this Recommendation have a wide application, further considering e) that the radiation pattern of the receiving antenna should also be taken into account when planning sound broadcasting services in band 7 (HF); f) that up to the present time no receiving antenna radiation pattern has been defined for the above purpose; g) that the receiving environment significantly affects the radiation pattern of receiving antennas; h) that a short vertical whip antenna is most often used for reception of sound broadcasting in band 7 (HF), recommends 1 that the formulae as illustrated by sample diagrams and contained in Appendix 1 to Annex 1 of this Recommendation together with the corresponding computer programs should be used to evaluate the performance of HF transmitting antennas; particularly for planning purposes; 2 that the formula as illustrated by a sample diagram and contained in Part 1 to Annex 2 to this Recommendation should be used to evaluate the performance of the receiving antenna for planning sound broadcasting services in band 7 (HF).
    [Show full text]
  • Impedance of a Corner-Reflector Antenna As a Function of the Diameter and Length of the Driven Element A
    JOURNAL OF RESEARCH of the National Bureau of Standards-D. Radio Propagation Vol. 64D, No.2, March-April 1960 Impedance of a Corner-Reflector Antenna as a Function of the Diameter and Length of the Driven Element A. C . Wilson * (September 21 , 1959) Impedance mea.<;UI'ements have been m ade for a monopole in a corner l'efterLor over an image plane as a function of t he monopole length, diam eter, and p osit ion within the corner­ reflector structure. The results are presented as a family of curves which should be useful in the design of the driven elem ent for a corner-reflector antenna of the size described in this paper and for other corner-refl ector antennas with similar p arameters. 1. Introduction from dipole to r eflecting planes for purposes of comparison, the impedance of corner-rcflector an­ In connection with an NBS-sponsored projcct tenna with 90 ° and 120° aperture angles may be to study meteor multipath, a requiremen t arose for computed Lo be approximately 41 + j96.5 and an antenna having a half-power beam"/idth in the 63 + j114 ohms respectively. For these compu­ E-plane of approximately 50° and a capability of Lations the dipole lengL h was assumed Lo be one-half radiating a 6-megawatt peak power at a fr equency wavelength in free space and infinitcsimally Lhin. of 40 M c. On the basis of past experience, a corner­ The effecL of the aperture angle can be seen Lo be reflector antenna driven by a half-wave dipole was significant.
    [Show full text]