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Military Microwaves Supplement
Recent Advances in Radar Technology
Using Calibration to Optimize Performance in Crucial Measurements
10 - 40 GHz Radio Antennas
The FlatFire™ point-to-point radio antennas provide superior sidelobe and gain characteristics while eliminating the conventional bulky shroud, resulting in a smaller, more rugged, attractive antenna. The antennas exceed all FCC, ETSI and BAPT requirements as well as EIA-195-C and EIA-222-F standards. Although well suited for indoor mounting, the antennas are designed to survive severe outdoor environments.
Gabriel Electronics Inc., Scarborough, ME (207) 883-5161.
Airborne Helical Array Antenna
The model 9930-800 airborne helical array antenna comprises eight individually sealed helix elements arranged in a ring while a microstrip feed network is used to combine the elements electrically. Operating in the 2200 to 2290 MHz frequency range, the antenna offers 100 W CW of power handling, gain of 20 dBi and SWR of 1.5 with right-hand circular polarization. A base plate is provided at the connector end of the array for mounting provisions. Type N female connectors are included.
Seavey Engineering Associates Inc., Pembroke, MA (781) 829-4740.
Biconical and Log Periodic Antenna
The model EM-6917B Biconicalog antenna is a hybrid combination of the industry-standard biconical and two log periodic antennas delivering both 26 MHz to 3 GHz frequency coverage and high power handling capability. The EM-6917B eliminates the need for adjustments or switching antennas in most test applications up to 3 GHz without comprising power handling capability for transmit applications. The antenna is supplied with an integral balun that minimizes the effect of cable placement on measurements and is individually calibrated for field strength measurements from 26 GHz to 3 GHz. Telescopically collapsible biconical elements are available for improved performance at lower frequencies.
Electro-Metrics Inc., Johnstown, NY (518) 762-2600.
Wide Beamwidth Panel Antennas
These high performance wide beamwidth panel antennas for 2.4 GHz wireless local area network (LAN) applications are available in seven models with 180° horizontal beamwidth and gains of 3.5, 6.0, 7.5, 8.5, 9.5, 10.5 and 11.5 dBi. SWR is less than 1.5 over 2.4 to 2.483 GHz. The antenna’s length varies from 4.5" to 20" and all of the antennas have the same width (2") and thickness (1"). The antennas are bottom-fed with SMA, N, TNC or other connector types.
SuperPass Company Inc., Waterloo, Ontario, Canada (519) 886-5186.
Integrated Mast Antenna
This integrated mast antenna comprises three antennas in the 30 to 420 MHz frequency range based on a 12 m fiberglass mast. The antennas are guyed at 5 and 10 m, supporting the mast against wind loading and the ground screen for the lowest frequency antenna. The fiberglass mast consists of 12 1 m sections, allowing the antenna to be broken down to a convenient size for portability. Total weight is 2 kg, permitting one person to carry the entire antenna system. The base plate is hinged and can be pegged into the ground for fast erection.
Poynting Innovations, Braamfontein, Johannesburg, South Africa +27 11 403 380.
Medium Gain Antennas
The DirectLink™ series medium gain antennas offer five mounting options to optimize challenging installation situations, including a ±30° articulating wall mount, standard wall mount, mast mount and universal wall/mast mount, which permits up to ±90° of vertical or horizontal main lobe steering. The model S57212AMP10SMF antenna is designed specifically for transmission and reception of linearly polarized signals in the 5725 to 5875 MHz industrial, scientific and medical band. The antenna uses a two-element patch array to provide a minimum gain of 12 dBi across the frequency range with a front-to-back ratio of better than 25 dB.
Cushcraft Corp., Manchester, NH (603) 627-7877.
Broadband Communications Antennas
The Broadband Communications Antennas (BCA) series has added the BCA series high gain sector antenna and the BCA series Mark II enhanced performance high gain sector antennas. All of the models offer versatile solutions for dealing with the complex and difficult issue of providing optimum, cost-effective coverage for broadband communications. The high gain sector antenna covers the 24.25 to 26.5 GHz frequency band while delivering 20.5 dBi of gain performance at 90° azimuth coverage. (Azimuth sizes of 45° and 90° in either vertical or horizontal polarization are available.) The elevation pattern is contoured to give the required signal strength inside the cover area free of nulls. The Mark II antennas provide enhanced, robust pattern performance and good cross-polarization rejection. The antenna’s azimuth patterns ensure minimum response outside of the sector region, which results in reduced sector-to-sector and intercell interference.
Andrew Corp., Orland Park, IL (800) 255-1479.
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