Showing papers on "Conformal antenna published in 1981"

Embedded insulated antennas for communication and heating

Abstract: The properties of insulated antennas that make them useful for subsurface communication or heating are discussed. Several antennas and associated feed lines suitable for use in bore holes or for in...

Conformal Antenna Array Design Handbook

Abstract: : Contents: Conformal Geometry; Aperture Synthesis; Modal Calculation of Slots on Cylinder; Modal Calculation of Slots on Cone; GTD Calculation of Slots; and Conical Array Experiments.

An extremely lightweight fuselage-integrated phased array for airborne applications

Abstract: A design of a lightweight low volume electronically scanned antenna is described. This antenna, besides being the radiating aperture, serves as a load-sharing fuselage panel in a small weight-sensitive remotely piloted vehicle (RPV). A demonstration array incorporating the microstrip radiating elements, stripline feed circuit, and microstrip-line p-i-n diode phase shifters was assembled to evaluate the electrical characteristics and scanning capabilities of the array. The demonstration array was tested on the antenna range and operated successfully as part of a radar/communication subsystem demonstration. An eight-element lightweight section of the demonstration array was subsequently designed and fabricated in a modern production facility utilizing numerically controlled machines and state-of-the-art printed circuit board etching and plating equipment. Successful operation of this lightweight section sufficiently demonstrated that a lightweight and low volume electronically steerable phase-array antenna can be fabricated and integrated into a structural panel in production quantities.

Conformal and Small Antenna Designs

Abstract: : Select antennas are described that can be used effectively on conformal surfaces. Most of these antennas are compact, are electrically and physically small, and can be easily integrated into conical and cylindrical bodies. Edge-slot, microstrip, and dielectric rod radiator design techniques are employed in the development of these antennas. Critical design parameters, modes of radiation, empirical data, and theoretical considerations are discussed. The intrinsic properties and characteristics of selected dielectric materials are considered.

Missile multi-frequency antenna

Abstract: A multifrequency antenna for a missile is realized by an arrangement in which four microwave antennas are located under a narrow circumferential slot in the skin of the missile forming four separate antennas each with its own input connector. Each antenna consists of a probe fed annular quarter wavelength microwave cavity which radiate out of a top wall end slot. The cavity antennas are fed by a stripline distribution network directly under the antennas. Two L band antennas are positioned directly adjacent the inner surface of the missile skin and an S band antenna and a C band antenna are positioned beneath the L band antennas. A radome covers the circumferential slot.

Bird-proof feed-horn windows for microwave radio system antennas

Abstract: Window units constructed from multiple dielectric plates offer means for combating bird damage to antenna feed horns on microwave radio systems. The need for such devices on Australian systems is increasing as routes are extended into the drier regions of the country. Measurements show that the antenna electrical characteristics are not appreciably altered by the new window units.

The First Candelabra for Circularly Polarized Broadcast Antennas

Abstract: A study of a circularly polarized (CP) television multiple antenna installation shows that improved measurement and theoretical techniques are required to model the scattered horizontal pattern circularity and video response in a candelabra. Previously developed guidelines for horizontally polarized antennas in a candelabra are inadequate to describe the expected performance of CP antennas in the same configuration. Results of calculations and measurements of model CP antennas for a Columbus, Ohio candelabra are included.

Dual polarized elliptical beam antenna for satellite application

Abstract: Requirements for efficient coverage of geographical areas on earth from a satellite frequently call for antennas which radiate beams of elliptical cross-section. Although in principle a wide range of antenna solutions may be considered, the additional demands placed upon the polarization purity of the radiated beams by many frequency re-use communication systems severely restrict the choice of antennas which can be employed for such applications.

Synthesized Isotropic Pattern Antennas for EM Field Measurements

Abstract: This paper d e s c r i b e s a s e t o f EM f i e l d measurement antennas co v er in g the range o f 10 kHz to 1 GHz which, under m icroprocessor c o n t r o l , s y n t h e s i z e an i s o t r o p i c r e s p o n s e . Another antenna, c o v er in g the frequency range o f 1 GHz to 18 GHz, s y n t h e s i z e s a wide v e r t i c a l a n g l e , o m n i d i r e c t i o n a l , response for s i g n a l s o f any l i n e a r , and one c i r c u l a r , p o l a r i z a t i o n . These antennas t o g e t h e r wi th an app rop r ia te in s tr u m e n ta t io n system a l lo w rapid a c q u i s i t i o n o f ambient f i e l d s tr e n g th da ta .